VERY HIGH ENERGY γ-RAYS from the UNIVERSE'S MIDDLE AGE: DETECTION of the z = 0.940 BLAZAR PKS 1441+25 with MAGIC

M. L. Ahnen; S. Ansoldi; L. A. Antonelli; P. Antoranz; A. Babic; B. Banerjee; P. Bangale; U. Barres De Almeida; J. A. Barrio; W. Bednarek; E. Bernardini; B. Biasuzzi; A. Biland; O. Blanch; S. Bonnefoy; G. Bonnoli; F. Borracci; T. Bretz; E. Carmona; A. Carosi; A. Chatterjee; R. Clavero; P. Colin; E. Colombo; J. L. Contreras; J. Cortina; S. Covino; P. Da Vela; F. Dazzi; A. De Angelis; B. De Lotto; E. De Oña Wilhelmi; C. Delgado Mendez; F. Di Pierro; D. Dominis Prester; D. Dorner; M. Doro; S. Einecke; D. Eisenacher Glawion; D. Elsaesser; A. Fernández-Barral; D. Fidalgo; M. V. Fonseca; L. Font; K. Frantzen; C. Fruck; D. Galindo; R. J.García López; M. Garczarczyk; D. Garrido Terrats; M. Gaug; P. Giammaria; N. Godinović; A. González Muñoz; D. Guberman; A. Hahn; Y. Hanabata; M. Hayashida; J. Herrera; J. Hose; D. Hrupec; G. Hughes; W. Idec; K. Kodani; Y. Konno; H. Kubo; J. Kushida; A. La Barbera; D. Lelas; E. Lindfors; S. Lombardi; M. López; R. López-Coto; A. López-Oramas; E. Lorenz; P. Majumdar; M. Makariev; K. Mallot; G. Maneva; M. Manganaro; K. Mannheim; L. Maraschi; B. Marcote; M. Mariotti; M. Martínez; D. Mazin; U. Menzel; J. M. Miranda; R. Mirzoyan; A. Moralejo; E. Moretti; D. Nakajima; V. Neustroev; A. Niedzwiecki; M. Nievas Rosillo; K. Nilsson; K. Nishijima; K. Noda; R. Orito; A. Overkemping; S. Paiano; J. Palacio; M. Palatiello; D. Paneque; R. Paoletti; J. M. Paredes; X. Paredes-Fortuny; M. Persic; J. Poutanen; P. G.Prada Moroni; E. Prandini; I. Puljak; W. Rhode; M. Ribó; J. Rico; J. Rodriguez Garcia; T. Saito; K. Satalecka; C. Schultz; T. Schweizer; S. N. Shore; A. Sillanpää; J. Sitarek; I. Snidaric; D. Sobczynska; A. Stamerra; T. Steinbring; M. Strzys; L. Takalo; H. Takami; F. Tavecchio; P. Temnikov; T. Terzić; D. Tescaro; M. Teshima; J. Thaele; D. F. Torres; T. Toyama; A. Treves; V. Verguilov; I. Vovk; J. E. Ward; M. Will; M. H. Wu; R. Zanin; M. Ajello; L. Baldini; G. Barbiellini; D. Bastieri; J. Becerra González; R. Bellazzini; E. Bissaldi; R. D. Blandford; R. Bonino; J. Bregeon; P. Bruel; S. Buson; G. A. Caliandro; R. A. Cameron; M. Caragiulo; P. A. Caraveo; E. Cavazzuti; J. Chiang; G. Chiaro; S. Ciprini; F. D'Ammando; F. De Palma; R. Desiante; L. Di Venere; A. Domínguez; P. Fusco; F. Gargano; D. Gasparrini; N. Giglietto; F. Giordano; M. Giroletti; I. A. Grenier; S. Guiriec; E. Hays; J. W. Hewitt; T. Jogler; M. Kuss; S. Larsson; J. Li; L. Li; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; S. Maldera; M. Mayer; M. N. Mazziotta; J. E. McEnery; N. Mirabal; T. Mizuno; M. E. Monzani; A. Morselli; I. V. Moskalenko; E. Nuss; R. Ojha; T. Ohsugi; N. Omodei; E. Orlando; J. S. Perkins; M. Pesce-Rollins; F. Piron; G. Pivato; T. A. Porter; S. Raino; R. Rando; M. Razzano; A. Reimer; O. Reimer; C. Sgro; E. J. Siskind; F. Spada; G. Spandre; P. Spinelli; H. Tajima; H. Takahashi; J. B. Thayer; D. J. Thompson; E. Troja; K. S. Wood; M. Balokovic; A. Berdyugin; A. Carraminana; L. Carrasco; V. Chavushyan; V. Fallah Ramazani; M. Feige; S. Haarto; P. Haeusner; T. Hovatta; J. Kania; J. Klamt; A. Lähteenmäki; J. Leon-Tavares; C. Lorey; L. Pacciani; A. Porras; E. Recillas; R. Reinthal; M. Tornikoski; D. Wolfert; N. Zottmann

doi:10.1088/2041-8205/815/2/L23

VERY HIGH ENERGY γ-RAYS from the UNIVERSE'S MIDDLE AGE: DETECTION of the z = 0.940 BLAZAR PKS 1441+25 with MAGIC

M. L. Ahnen
, S. Ansoldi
, L. A. Antonelli
, P. Antoranz
, A. Babic
, B. Banerjee
, P. Bangale
, U. Barres De Almeida
, J. A. Barrio
, W. Bednarek
, E. Bernardini
, B. Biasuzzi
, A. Biland
, O. Blanch
, S. Bonnefoy
, G. Bonnoli
, F. Borracci
, T. Bretz
, E. Carmona
, A. Carosi

A. Chatterjee, R. Clavero, P. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, E. De Oña Wilhelmi, C. Delgado Mendez, F. Di Pierro, D. Dominis Prester, D. Dorner, M. Doro, S. Einecke, D. Eisenacher Glawion, D. Elsaesser, A. Fernández-Barral, D. Fidalgo, M. V. Fonseca, L. Font, K. Frantzen, C. Fruck, D. Galindo, R. J.García López, M. Garczarczyk, D. Garrido Terrats, M. Gaug, P. Giammaria, N. Godinović, A. González Muñoz, D. Guberman, A. Hahn, Y. Hanabata, M. Hayashida, J. Herrera, J. Hose, D. Hrupec, G. Hughes, W. Idec, K. Kodani, Y. Konno, H. Kubo, J. Kushida, A. La Barbera, D. Lelas, E. Lindfors, S. Lombardi, M. López, R. López-Coto, A. López-Oramas, E. Lorenz, P. Majumdar, M. Makariev, K. Mallot, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, B. Marcote, M. Mariotti, M. Martínez, D. Mazin, U. Menzel, J. M. Miranda, R. Mirzoyan, A. Moralejo, E. Moretti, D. Nakajima, V. Neustroev, A. Niedzwiecki, M. Nievas Rosillo, K. Nilsson, K. Nishijima, K. Noda, R. Orito, A. Overkemping, S. Paiano, J. Palacio, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, X. Paredes-Fortuny, M. Persic, J. Poutanen, P. G.Prada Moroni, E. Prandini, I. Puljak, W. Rhode, M. Ribó, J. Rico, J. Rodriguez Garcia, T. Saito, K. Satalecka, C. Schultz, T. Schweizer, S. N. Shore, A. Sillanpää, J. Sitarek, I. Snidaric, D. Sobczynska, A. Stamerra, T. Steinbring, M. Strzys, L. Takalo, H. Takami, F. Tavecchio, P. Temnikov, T. Terzić, D. Tescaro, M. Teshima, J. Thaele, D. F. Torres, T. Toyama, A. Treves, V. Verguilov, I. Vovk, J. E. Ward, M. Will, M. H. Wu, R. Zanin, M. Ajello, L. Baldini, G. Barbiellini, D. Bastieri, J. Becerra González, R. Bellazzini, E. Bissaldi, R. D. Blandford, R. Bonino, J. Bregeon, P. Bruel, S. Buson, G. A. Caliandro, R. A. Cameron, M. Caragiulo, P. A. Caraveo, E. Cavazzuti, J. Chiang, G. Chiaro, S. Ciprini, F. D'Ammando, F. De Palma, R. Desiante, L. Di Venere, A. Domínguez, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, F. Giordano, M. Giroletti, I. A. Grenier, S. Guiriec, E. Hays, J. W. Hewitt, T. Jogler, M. Kuss, S. Larsson, J. Li, L. Li, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, S. Maldera, M. Mayer, M. N. Mazziotta, J. E. McEnery, N. Mirabal, T. Mizuno, M. E. Monzani, A. Morselli, I. V. Moskalenko, E. Nuss, R. Ojha, T. Ohsugi, N. Omodei, E. Orlando, J. S. Perkins, M. Pesce-Rollins, F. Piron, G. Pivato, T. A. Porter, S. Raino, R. Rando, M. Razzano, A. Reimer, O. Reimer, C. Sgro, E. J. Siskind, F. Spada, G. Spandre, P. Spinelli, H. Tajima, H. Takahashi, J. B. Thayer, D. J. Thompson, E. Troja, K. S. Wood, M. Balokovic, A. Berdyugin, A. Carraminana, L. Carrasco, V. Chavushyan, V. Fallah Ramazani, M. Feige, S. Haarto, P. Haeusner, T. Hovatta, J. Kania, J. Klamt, A. Lähteenmäki, J. Leon-Tavares, C. Lorey, L. Pacciani, A. Porras, E. Recillas, R. Reinthal, M. Tornikoski, D. Wolfert, N. Zottmann

ETH Zurich
and Physics University of Udine
Istituto di Astrofisica e Planetologia Spaziali (IAPS)
University of Siena
University of Rijeka
Saha Institute of Nuclear Physics
Max-Planck-Institut für Physik
Centro Brasileiro de Pesquisas Fisicas
Complutense University
University of Lodz
c/o DESY
Humboldt-Universität zu Berlin
The Barcelona Institute of Science and Technology
University of Würzburg
ENAC-IIC-GEL
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
Instituto de Astrofisica de Canarias
Research Unit; CIBERNED and Universidad de La Laguna
University of Padova
Campus UAB
INFN
University of Dortmund
University of São Paulo
University of Barcelona
University of Tokyo
University of Turku
Universite Paris-Saclay
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
Finnish Centre for Astronomy with ESO (FINCA)
INAF-Trieste
University of Pisa
University of Geneva
Pompeu Fabra University (UPF)
University of Insubria
Clemson University
Kavli Institute for Particle Astrophysics and Cosmology
INFN Sezione di Trieste
University of Trieste
NASA Goddard Space Flight Center
University of Maryland
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
INFN Sezione di Bari
INFN Sezione di Torino
University of Turin
Laboratoire Univers et Particules de Montpellier
Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Science and Research Directorate
INFN Sezione di Perugia
Osservatorio Astronomico di Roma
INAF Istituto di Radioastronomia
University of Bologna
Università Telematica Pegaso
Politecnico di Bari
NASA Postdoctoral Program Fellow
University of North Florida
KTH Royal Institute of Technology
Oskar Klein Centre
Naval Research Laboratory
University of Perugia
Hiroshima University
Sezione di Roma
Catholic University of America
Biochemical and Environmental Engineering
Medical University of Innsbruck
NYCB Real-Time Computing Inc.
Nagoya University
California Institute of Technology
Instituto Nacional de Astrofísica Óptica y Electrónica (INAOE)
Naturwissenschaftliches Labor für Schüler
Aalto University

Research output: Contribution to journal › Article › peer-review

Abstract

The flat-spectrum radio quasar PKS 1441+25 at a redshift of z = 0.940 is detected between 40 and 250 GeV with a significance of 25.5σ using the MAGIC telescopes. Together with the gravitationally lensed blazar QSO B0218+357 (z = 0.944), PKS 1441+25 is the most distant very high energy (VHE) blazar detected to date. The observations were triggered by an outburst in 2015 April seen at GeV energies with the Large Area Telescope on board Fermi. Multi-wavelength observations suggest a subdivision of the high state into two distinct flux states. In the band covered by MAGIC, the variability timescale is estimated to be 6.4 ±1.9 days. Modeling the broadband spectral energy distribution with an external Compton model, the location of the emitting region is understood as originating in the jet outside the broad-line region (BLR) during the period of high activity, while being partially within the BLR during the period of low (typical) activity. The observed VHE spectrum during the highest activity is used to probe the extragalactic background light at an unprecedented distance scale for ground-based gamma-ray astronomy.

Original language	English
Article number	L23
Journal	Astrophysical Journal Letters
Volume	815
Issue number	2
DOIs	https://doi.org/10.1088/2041-8205/815/2/L23
Publication status	Published - 20 Dec 2015

Keywords

cosmic background radiation
galaxies: active
galaxies: jets
gamma rays: galaxies
quasars: individual (PKS 1441+25)

Access to Document

10.1088/2041-8205/815/2/L23

Cite this

Ahnen, M. L., Ansoldi, S., Antonelli, L. A., Antoranz, P., Babic, A., Banerjee, B., Bangale, P., De Almeida, U. B., Barrio, J. A., Bednarek, W., Bernardini, E., Biasuzzi, B., Biland, A., Blanch, O., Bonnefoy, S., Bonnoli, G., Borracci, F., Bretz, T., Carmona, E., ... Zottmann, N. (2015). VERY HIGH ENERGY γ-RAYS from the UNIVERSE'S MIDDLE AGE: DETECTION of the z = 0.940 BLAZAR PKS 1441+25 with MAGIC. Astrophysical Journal Letters, 815(2), Article L23. https://doi.org/10.1088/2041-8205/815/2/L23

@article{6bc35142dc954f11a01d433899474751,

title = "VERY HIGH ENERGY γ-RAYS from the UNIVERSE'S MIDDLE AGE: DETECTION of the z = 0.940 BLAZAR PKS 1441+25 with MAGIC",

abstract = "The flat-spectrum radio quasar PKS 1441+25 at a redshift of z = 0.940 is detected between 40 and 250 GeV with a significance of 25.5σ using the MAGIC telescopes. Together with the gravitationally lensed blazar QSO B0218+357 (z = 0.944), PKS 1441+25 is the most distant very high energy (VHE) blazar detected to date. The observations were triggered by an outburst in 2015 April seen at GeV energies with the Large Area Telescope on board Fermi. Multi-wavelength observations suggest a subdivision of the high state into two distinct flux states. In the band covered by MAGIC, the variability timescale is estimated to be 6.4 ±1.9 days. Modeling the broadband spectral energy distribution with an external Compton model, the location of the emitting region is understood as originating in the jet outside the broad-line region (BLR) during the period of high activity, while being partially within the BLR during the period of low (typical) activity. The observed VHE spectrum during the highest activity is used to probe the extragalactic background light at an unprecedented distance scale for ground-based gamma-ray astronomy.",

keywords = "cosmic background radiation, galaxies: active, galaxies: jets, gamma rays: galaxies, quasars: individual (PKS 1441+25)",

author = "Ahnen, \{M. L.\} and S. Ansoldi and Antonelli, \{L. A.\} and P. Antoranz and A. Babic and B. Banerjee and P. Bangale and \{De Almeida\}, \{U. Barres\} and Barrio, \{J. A.\} and W. Bednarek and E. Bernardini and B. Biasuzzi and A. Biland and O. Blanch and S. Bonnefoy and G. Bonnoli and F. Borracci and T. Bretz and E. Carmona and A. Carosi and A. Chatterjee and R. Clavero and P. Colin and E. Colombo and Contreras, \{J. L.\} and J. Cortina and S. Covino and \{Da Vela\}, P. and F. Dazzi and \{De Angelis\}, A. and \{De Lotto\}, B. and \{De O{\~n}a Wilhelmi\}, E. and Mendez, \{C. Delgado\} and \{Di Pierro\}, F. and Prester, \{D. Dominis\} and D. Dorner and M. Doro and S. Einecke and Glawion, \{D. Eisenacher\} and D. Elsaesser and A. Fern{\'a}ndez-Barral and D. Fidalgo and Fonseca, \{M. V.\} and L. Font and K. Frantzen and C. Fruck and D. Galindo and L{\'o}pez, \{R. J.Garc{\'i}a\} and M. Garczarczyk and Terrats, \{D. Garrido\} and M. Gaug and P. Giammaria and N. Godinovi{\'c} and Mu{\~n}oz, \{A. Gonz{\'a}lez\} and D. Guberman and A. Hahn and Y. Hanabata and M. Hayashida and J. Herrera and J. Hose and D. Hrupec and G. Hughes and W. Idec and K. Kodani and Y. Konno and H. Kubo and J. Kushida and \{La Barbera\}, A. and D. Lelas and E. Lindfors and S. Lombardi and M. L{\'o}pez and R. L{\'o}pez-Coto and A. L{\'o}pez-Oramas and E. Lorenz and P. Majumdar and M. Makariev and K. Mallot and G. Maneva and M. Manganaro and K. Mannheim and L. Maraschi and B. Marcote and M. Mariotti and M. Mart{\'i}nez and D. Mazin and U. Menzel and Miranda, \{J. M.\} and R. Mirzoyan and A. Moralejo and E. Moretti and D. Nakajima and V. Neustroev and A. Niedzwiecki and Rosillo, \{M. Nievas\} and K. Nilsson and K. Nishijima and K. Noda and R. Orito and A. Overkemping and S. Paiano and J. Palacio and M. Palatiello and D. Paneque and R. Paoletti and Paredes, \{J. M.\} and X. Paredes-Fortuny and M. Persic and J. Poutanen and Moroni, \{P. G.Prada\} and E. Prandini and I. Puljak and W. Rhode and M. Rib{\'o} and J. Rico and Garcia, \{J. Rodriguez\} and T. Saito and K. Satalecka and C. Schultz and T. Schweizer and Shore, \{S. N.\} and A. Sillanp{\"a}{\"a} and J. Sitarek and I. Snidaric and D. Sobczynska and A. Stamerra and T. Steinbring and M. Strzys and L. Takalo and H. Takami and F. Tavecchio and P. Temnikov and T. Terzi{\'c} and D. Tescaro and M. Teshima and J. Thaele and Torres, \{D. F.\} and T. Toyama and A. Treves and V. Verguilov and I. Vovk and Ward, \{J. E.\} and M. Will and Wu, \{M. H.\} and R. Zanin and M. Ajello and L. Baldini and G. Barbiellini and D. Bastieri and Gonz{\'a}lez, \{J. Becerra\} and R. Bellazzini and E. Bissaldi and Blandford, \{R. D.\} and R. Bonino and J. Bregeon and P. Bruel and S. Buson and Caliandro, \{G. A.\} and Cameron, \{R. A.\} and M. Caragiulo and Caraveo, \{P. A.\} and E. Cavazzuti and J. Chiang and G. Chiaro and S. Ciprini and F. D'Ammando and \{De Palma\}, F. and R. Desiante and \{Di Venere\}, L. and A. Dom{\'i}nguez and P. Fusco and F. Gargano and D. Gasparrini and N. Giglietto and F. Giordano and M. Giroletti and Grenier, \{I. A.\} and S. Guiriec and E. Hays and Hewitt, \{J. W.\} and T. Jogler and M. Kuss and S. Larsson and J. Li and L. Li and F. Longo and F. Loparco and Lovellette, \{M. N.\} and P. Lubrano and S. Maldera and M. Mayer and Mazziotta, \{M. N.\} and McEnery, \{J. E.\} and N. Mirabal and T. Mizuno and Monzani, \{M. E.\} and A. Morselli and Moskalenko, \{I. V.\} and E. Nuss and R. Ojha and T. Ohsugi and N. Omodei and E. Orlando and Perkins, \{J. S.\} and M. Pesce-Rollins and F. Piron and G. Pivato and Porter, \{T. A.\} and S. Raino and R. Rando and M. Razzano and A. Reimer and O. Reimer and C. Sgro and Siskind, \{E. J.\} and F. Spada and G. Spandre and P. Spinelli and H. Tajima and H. Takahashi and Thayer, \{J. B.\} and Thompson, \{D. J.\} and E. Troja and Wood, \{K. S.\} and M. Balokovic and A. Berdyugin and A. Carraminana and L. Carrasco and V. Chavushyan and Ramazani, \{V. Fallah\} and M. Feige and S. Haarto and P. Haeusner and T. Hovatta and J. Kania and J. Klamt and A. L{\"a}hteenm{\"a}ki and J. Leon-Tavares and C. Lorey and L. Pacciani and A. Porras and E. Recillas and R. Reinthal and M. Tornikoski and D. Wolfert and N. Zottmann",

year = "2015",

month = dec,

day = "20",

doi = "10.1088/2041-8205/815/2/L23",

language = "English",

volume = "815",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

number = "2",

}

Ahnen, ML, Ansoldi, S, Antonelli, LA, Antoranz, P, Babic, A, Banerjee, B, Bangale, P, De Almeida, UB, Barrio, JA, Bednarek, W, Bernardini, E, Biasuzzi, B, Biland, A, Blanch, O, Bonnefoy, S, Bonnoli, G, Borracci, F, Bretz, T, Carmona, E, Carosi, A, Chatterjee, A, Clavero, R, Colin, P, Colombo, E, Contreras, JL, Cortina, J, Covino, S, Da Vela, P, Dazzi, F, De Angelis, A, De Lotto, B, De Oña Wilhelmi, E, Mendez, CD, Di Pierro, F, Prester, DD, Dorner, D, Doro, M, Einecke, S, Glawion, DE, Elsaesser, D, Fernández-Barral, A, Fidalgo, D, Fonseca, MV, Font, L, Frantzen, K, Fruck, C, Galindo, D, López, RJG, Garczarczyk, M, Terrats, DG, Gaug, M, Giammaria, P, Godinović, N, Muñoz, AG, Guberman, D, Hahn, A, Hanabata, Y, Hayashida, M, Herrera, J, Hose, J, Hrupec, D, Hughes, G, Idec, W, Kodani, K, Konno, Y, Kubo, H, Kushida, J, La Barbera, A, Lelas, D, Lindfors, E, Lombardi, S, López, M, López-Coto, R, López-Oramas, A, Lorenz, E, Majumdar, P, Makariev, M, Mallot, K, Maneva, G, Manganaro, M, Mannheim, K, Maraschi, L, Marcote, B, Mariotti, M, Martínez, M, Mazin, D, Menzel, U, Miranda, JM, Mirzoyan, R, Moralejo, A, Moretti, E, Nakajima, D, Neustroev, V, Niedzwiecki, A, Rosillo, MN, Nilsson, K, Nishijima, K, Noda, K, Orito, R, Overkemping, A, Paiano, S, Palacio, J, Palatiello, M, Paneque, D, Paoletti, R, Paredes, JM, Paredes-Fortuny, X, Persic, M, Poutanen, J, Moroni, PGP, Prandini, E, Puljak, I, Rhode, W, Ribó, M, Rico, J, Garcia, JR, Saito, T, Satalecka, K, Schultz, C, Schweizer, T, Shore, SN, Sillanpää, A, Sitarek, J, Snidaric, I, Sobczynska, D, Stamerra, A, Steinbring, T, Strzys, M, Takalo, L, Takami, H, Tavecchio, F, Temnikov, P, Terzić, T, Tescaro, D, Teshima, M, Thaele, J, Torres, DF, Toyama, T, Treves, A, Verguilov, V, Vovk, I, Ward, JE, Will, M, Wu, MH, Zanin, R, Ajello, M, Baldini, L, Barbiellini, G, Bastieri, D, González, JB, Bellazzini, R, Bissaldi, E, Blandford, RD, Bonino, R, Bregeon, J, Bruel, P, Buson, S, Caliandro, GA, Cameron, RA, Caragiulo, M, Caraveo, PA, Cavazzuti, E, Chiang, J, Chiaro, G, Ciprini, S, D'Ammando, F, De Palma, F, Desiante, R, Di Venere, L, Domínguez, A, Fusco, P, Gargano, F, Gasparrini, D, Giglietto, N, Giordano, F, Giroletti, M, Grenier, IA, Guiriec, S, Hays, E, Hewitt, JW, Jogler, T, Kuss, M, Larsson, S, Li, J, Li, L, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Maldera, S, Mayer, M, Mazziotta, MN, McEnery, JE, Mirabal, N, Mizuno, T, Monzani, ME, Morselli, A, Moskalenko, IV, Nuss, E, Ojha, R, Ohsugi, T, Omodei, N, Orlando, E, Perkins, JS, Pesce-Rollins, M, Piron, F, Pivato, G, Porter, TA, Raino, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Sgro, C, Siskind, EJ, Spada, F, Spandre, G, Spinelli, P, Tajima, H, Takahashi, H, Thayer, JB, Thompson, DJ, Troja, E, Wood, KS, Balokovic, M, Berdyugin, A, Carraminana, A, Carrasco, L, Chavushyan, V, Ramazani, VF, Feige, M, Haarto, S, Haeusner, P, Hovatta, T, Kania, J, Klamt, J, Lähteenmäki, A, Leon-Tavares, J, Lorey, C, Pacciani, L, Porras, A, Recillas, E, Reinthal, R, Tornikoski, M, Wolfert, D & Zottmann, N 2015, 'VERY HIGH ENERGY γ-RAYS from the UNIVERSE'S MIDDLE AGE: DETECTION of the z = 0.940 BLAZAR PKS 1441+25 with MAGIC', Astrophysical Journal Letters, vol. 815, no. 2, L23. https://doi.org/10.1088/2041-8205/815/2/L23

TY - JOUR

T1 - VERY HIGH ENERGY γ-RAYS from the UNIVERSE'S MIDDLE AGE

T2 - DETECTION of the z = 0.940 BLAZAR PKS 1441+25 with MAGIC

AU - Ahnen, M. L.

AU - Ansoldi, S.

AU - Antonelli, L. A.

AU - Antoranz, P.

AU - Babic, A.

AU - Banerjee, B.

AU - Bangale, P.

AU - De Almeida, U. Barres

AU - Barrio, J. A.

AU - Bednarek, W.

AU - Bernardini, E.

AU - Biasuzzi, B.

AU - Biland, A.

AU - Blanch, O.

AU - Bonnefoy, S.

AU - Bonnoli, G.

AU - Borracci, F.

AU - Bretz, T.

AU - Carmona, E.

AU - Carosi, A.

AU - Chatterjee, A.

AU - Clavero, R.

AU - Colin, P.

AU - Colombo, E.

AU - Contreras, J. L.

AU - Cortina, J.

AU - Covino, S.

AU - Da Vela, P.

AU - Dazzi, F.

AU - De Angelis, A.

AU - De Lotto, B.

AU - De Oña Wilhelmi, E.

AU - Mendez, C. Delgado

AU - Di Pierro, F.

AU - Prester, D. Dominis

AU - Dorner, D.

AU - Doro, M.

AU - Einecke, S.

AU - Glawion, D. Eisenacher

AU - Elsaesser, D.

AU - Fernández-Barral, A.

AU - Fidalgo, D.

AU - Fonseca, M. V.

AU - Font, L.

AU - Frantzen, K.

AU - Fruck, C.

AU - Galindo, D.

AU - López, R. J.García

AU - Garczarczyk, M.

AU - Terrats, D. Garrido

AU - Gaug, M.

AU - Giammaria, P.

AU - Godinović, N.

AU - Muñoz, A. González

AU - Guberman, D.

AU - Hahn, A.

AU - Hanabata, Y.

AU - Hayashida, M.

AU - Herrera, J.

AU - Hose, J.

AU - Hrupec, D.

AU - Hughes, G.

AU - Idec, W.

AU - Kodani, K.

AU - Konno, Y.

AU - Kubo, H.

AU - Kushida, J.

AU - La Barbera, A.

AU - Lelas, D.

AU - Lindfors, E.

AU - Lombardi, S.

AU - López, M.

AU - López-Coto, R.

AU - López-Oramas, A.

AU - Lorenz, E.

AU - Majumdar, P.

AU - Makariev, M.

AU - Mallot, K.

AU - Maneva, G.

AU - Manganaro, M.

AU - Mannheim, K.

AU - Maraschi, L.

AU - Marcote, B.

AU - Mariotti, M.

AU - Martínez, M.

AU - Mazin, D.

AU - Menzel, U.

AU - Miranda, J. M.

AU - Mirzoyan, R.

AU - Moralejo, A.

AU - Moretti, E.

AU - Nakajima, D.

AU - Neustroev, V.

AU - Niedzwiecki, A.

AU - Rosillo, M. Nievas

AU - Nilsson, K.

AU - Nishijima, K.

AU - Noda, K.

AU - Orito, R.

AU - Overkemping, A.

AU - Paiano, S.

AU - Palacio, J.

AU - Palatiello, M.

AU - Paneque, D.

AU - Paoletti, R.

AU - Paredes, J. M.

AU - Paredes-Fortuny, X.

AU - Persic, M.

AU - Poutanen, J.

AU - Moroni, P. G.Prada

AU - Prandini, E.

AU - Puljak, I.

AU - Rhode, W.

AU - Ribó, M.

AU - Rico, J.

AU - Garcia, J. Rodriguez

AU - Saito, T.

AU - Satalecka, K.

AU - Schultz, C.

AU - Schweizer, T.

AU - Shore, S. N.

AU - Sillanpää, A.

AU - Sitarek, J.

AU - Snidaric, I.

AU - Sobczynska, D.

AU - Stamerra, A.

AU - Steinbring, T.

AU - Strzys, M.

AU - Takalo, L.

AU - Takami, H.

AU - Tavecchio, F.

AU - Temnikov, P.

AU - Terzić, T.

AU - Tescaro, D.

AU - Teshima, M.

AU - Thaele, J.

AU - Torres, D. F.

AU - Toyama, T.

AU - Treves, A.

AU - Verguilov, V.

AU - Vovk, I.

AU - Ward, J. E.

AU - Will, M.

AU - Wu, M. H.

AU - Zanin, R.

AU - Ajello, M.

AU - Baldini, L.

AU - Barbiellini, G.

AU - Bastieri, D.

AU - González, J. Becerra

AU - Bellazzini, R.

AU - Bissaldi, E.

AU - Blandford, R. D.

AU - Bonino, R.

AU - Bregeon, J.

AU - Bruel, P.

AU - Buson, S.

AU - Caliandro, G. A.

AU - Cameron, R. A.

AU - Caragiulo, M.

AU - Caraveo, P. A.

AU - Cavazzuti, E.

AU - Chiang, J.

AU - Chiaro, G.

AU - Ciprini, S.

AU - D'Ammando, F.

AU - De Palma, F.

AU - Desiante, R.

AU - Di Venere, L.

AU - Domínguez, A.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Giglietto, N.

AU - Giordano, F.

AU - Giroletti, M.

AU - Grenier, I. A.

AU - Guiriec, S.

AU - Hays, E.

AU - Hewitt, J. W.

AU - Jogler, T.

AU - Kuss, M.

AU - Larsson, S.

AU - Li, J.

AU - Li, L.

AU - Longo, F.

AU - Loparco, F.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Maldera, S.

AU - Mayer, M.

AU - Mazziotta, M. N.

AU - McEnery, J. E.

AU - Mirabal, N.

AU - Mizuno, T.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Moskalenko, I. V.

AU - Nuss, E.

AU - Ojha, R.

AU - Ohsugi, T.

AU - Omodei, N.

AU - Orlando, E.

AU - Perkins, J. S.

AU - Pesce-Rollins, M.

AU - Piron, F.

AU - Pivato, G.

AU - Porter, T. A.

AU - Raino, S.

AU - Rando, R.

AU - Razzano, M.

AU - Reimer, A.

AU - Reimer, O.

AU - Sgro, C.

AU - Siskind, E. J.

AU - Spada, F.

AU - Spandre, G.

AU - Spinelli, P.

AU - Tajima, H.

AU - Takahashi, H.

AU - Thayer, J. B.

AU - Thompson, D. J.

AU - Troja, E.

AU - Wood, K. S.

AU - Balokovic, M.

AU - Berdyugin, A.

AU - Carraminana, A.

AU - Carrasco, L.

AU - Chavushyan, V.

AU - Ramazani, V. Fallah

AU - Feige, M.

AU - Haarto, S.

AU - Haeusner, P.

AU - Hovatta, T.

AU - Kania, J.

AU - Klamt, J.

AU - Lähteenmäki, A.

AU - Leon-Tavares, J.

AU - Lorey, C.

AU - Pacciani, L.

AU - Porras, A.

AU - Recillas, E.

AU - Reinthal, R.

AU - Tornikoski, M.

AU - Wolfert, D.

AU - Zottmann, N.

PY - 2015/12/20

Y1 - 2015/12/20

N2 - The flat-spectrum radio quasar PKS 1441+25 at a redshift of z = 0.940 is detected between 40 and 250 GeV with a significance of 25.5σ using the MAGIC telescopes. Together with the gravitationally lensed blazar QSO B0218+357 (z = 0.944), PKS 1441+25 is the most distant very high energy (VHE) blazar detected to date. The observations were triggered by an outburst in 2015 April seen at GeV energies with the Large Area Telescope on board Fermi. Multi-wavelength observations suggest a subdivision of the high state into two distinct flux states. In the band covered by MAGIC, the variability timescale is estimated to be 6.4 ±1.9 days. Modeling the broadband spectral energy distribution with an external Compton model, the location of the emitting region is understood as originating in the jet outside the broad-line region (BLR) during the period of high activity, while being partially within the BLR during the period of low (typical) activity. The observed VHE spectrum during the highest activity is used to probe the extragalactic background light at an unprecedented distance scale for ground-based gamma-ray astronomy.

AB - The flat-spectrum radio quasar PKS 1441+25 at a redshift of z = 0.940 is detected between 40 and 250 GeV with a significance of 25.5σ using the MAGIC telescopes. Together with the gravitationally lensed blazar QSO B0218+357 (z = 0.944), PKS 1441+25 is the most distant very high energy (VHE) blazar detected to date. The observations were triggered by an outburst in 2015 April seen at GeV energies with the Large Area Telescope on board Fermi. Multi-wavelength observations suggest a subdivision of the high state into two distinct flux states. In the band covered by MAGIC, the variability timescale is estimated to be 6.4 ±1.9 days. Modeling the broadband spectral energy distribution with an external Compton model, the location of the emitting region is understood as originating in the jet outside the broad-line region (BLR) during the period of high activity, while being partially within the BLR during the period of low (typical) activity. The observed VHE spectrum during the highest activity is used to probe the extragalactic background light at an unprecedented distance scale for ground-based gamma-ray astronomy.

KW - cosmic background radiation

KW - galaxies: active

KW - galaxies: jets

KW - gamma rays: galaxies

KW - quasars: individual (PKS 1441+25)

UR - https://www.scopus.com/pages/publications/84951862019

U2 - 10.1088/2041-8205/815/2/L23

DO - 10.1088/2041-8205/815/2/L23

M3 - Article

AN - SCOPUS:84951862019

SN - 2041-8205

VL - 815

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L23

ER -

VERY HIGH ENERGY γ-RAYS from the UNIVERSE'S MIDDLE AGE: DETECTION of the z = 0.940 BLAZAR PKS 1441+25 with MAGIC

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this