SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA

M. Ackermann; M. Ajello; A. Albert; W. B. Atwood; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; E. Bissaldi; R. D. Blandford; E. D. Bloom; R. Bonino; E. Bottacini; J. Bregeon; P. Bruel; R. Buehler; G. A. Caliandro; R. A. Cameron; M. Caragiulo; P. A. Caraveo; J. M. Casandjian; E. Cavazzuti; C. Cecchi; E. Charles; A. Chekhtman; G. Chiaro; S. Ciprini; J. Cohen-Tanugi; J. Conrad; S. Cutini; F. D'Ammando; A. De Angelis; F. De Palma; R. Desiante; S. W. Digel; L. Di Venere; P. S. Drell; C. Favuzzi; S. J. Fegan; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Giglietto; F. Giordano; M. Giroletti; G. Godfrey; D. Green; I. A. Grenier; S. Guiriec; E. Hays; J. W. Hewitt; D. Horan; G. Jóhannesson; M. Kuss; S. Larsson; L. Latronico; J. Li; L. Li; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; G. M. Madejski; S. Maldera; A. Manfreda; M. Mayer; M. N. Mazziotta; P. F. Michelson; W. Mitthumsiri; T. Mizuno; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; E. Nuss; T. Ohsugi; M. Orienti; E. Orlando; J. F. Ormes; D. Paneque; M. Pesce-Rollins; V. Petrosian; F. Piron; G. Pivato; T. A. Porter; S. Rainò; R. Rando; M. Razzano; A. Reimer; O. Reimer; M. Sánchez-Conde; C. Sgrò; E. J. Siskind; F. Spada; G. Spandre; P. Spinelli; H. Tajima; H. Takahashi; J. B. Thayer; L. Tibaldo; D. F. Torres; G. Tosti; E. Troja; G. Vianello; K. S. Wood; S. Zimmer; Y. Rephaeli

doi:10.3847/0004-637X/819/2/149

SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA

M. Ackermann
, M. Ajello
, A. Albert
, W. B. Atwood
, L. Baldini
, J. Ballet
, G. Barbiellini
, D. Bastieri
, K. Bechtol
, R. Bellazzini
, E. Bissaldi
, R. D. Blandford
, E. D. Bloom
, R. Bonino
, E. Bottacini
, J. Bregeon
, P. Bruel
, R. Buehler
, G. A. Caliandro
, R. A. Cameron

M. Caragiulo, P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, G. Chiaro, S. Ciprini, J. Cohen-Tanugi, J. Conrad, S. Cutini, F. D'Ammando, A. De Angelis, F. De Palma, R. Desiante, S. W. Digel, L. Di Venere, P. S. Drell, C. Favuzzi, S. J. Fegan, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, F. Giordano, M. Giroletti, G. Godfrey, D. Green, I. A. Grenier, S. Guiriec, E. Hays, J. W. Hewitt, D. Horan, G. Jóhannesson, M. Kuss, S. Larsson, L. Latronico, J. Li, L. Li, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, G. M. Madejski, S. Maldera, A. Manfreda, M. Mayer, M. N. Mazziotta, P. F. Michelson, W. Mitthumsiri, T. Mizuno, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, E. Nuss, T. Ohsugi, M. Orienti, E. Orlando, J. F. Ormes, D. Paneque, M. Pesce-Rollins, V. Petrosian, F. Piron, G. Pivato, T. A. Porter, S. Rainò, R. Rando, M. Razzano, A. Reimer, O. Reimer, M. Sánchez-Conde, C. Sgrò, E. J. Siskind, F. Spada, G. Spandre, P. Spinelli, H. Tajima, H. Takahashi, J. B. Thayer, L. Tibaldo, D. F. Torres, G. Tosti, E. Troja, G. Vianello, K. S. Wood, S. Zimmer, Y. Rephaeli

c/o DESY
Clemson University
Kavli Institute for Particle Astrophysics and Cosmology
University of California at Santa Cruz
University of Pisa
Universite Paris-Saclay
INFN Sezione di Trieste
University of Trieste
INFN
University of Padova
University of Wisconsin-Madison
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)
Politecnico di Bari
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Science and Research Directorate
INFN Sezione di Perugia
University of Perugia
George Mason University
Stockholm University
Oskar Klein Centre
Osservatorio Astronomico di Roma
INAF Istituto di Radioastronomia
University of Bologna
and Physics University of Udine
Università Telematica Pegaso
Hiroshima University
Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen
University of Maryland
NASA Goddard Space Flight Center
University of North Florida
University of Iceland
KTH Royal Institute of Technology
University of Sheffield
Naval Research Laboratory
Faculty of Science, Mahidol University
Sezione di Roma
Long Beach VA and University of California
University of Denver
Max-Planck-Institut für Physik
Medical University of Innsbruck
NYCB Real-Time Computing Inc.
Nagoya University
Max-Planck-Institut für Kernphysik
Pompeu Fabra University (UPF)
Tel Aviv University
University of California at San Diego

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

We present results from γ-ray observations of the Coma cluster incorporating six years of Fermi-LAT data and the newly released "Pass 8" event-level analysis. Our analysis of the region reveals low-significance residual structures within the virial radius of the cluster that are too faint for a detailed investigation with the current data. Using a likelihood approach that is free of assumptions on the spectral shape we derive upper limits on the γ-ray flux that is expected from energetic particle interactions in the cluster. We also consider a benchmark spatial and spectral template motivated by models in which the observed radio halo is mostly emission by secondary electrons. In this case, the median expected and observed upper limits for the flux above 100 are 1.7 times;10^-9 ph cm^-2 s^-1 and 5.2 times;10^-9 ph cm^-2 s^-1 respectively (the latter corresponds to residual emission at the level of 1.8σ). These bounds are comparable to or higher than predicted levels of hadronic gamma-ray emission in cosmic-ray (CR) models with or without reacceleration of secondary electrons, although direct comparisons are sensitive to assumptions regarding the origin and propagation mode of CRs and magnetic field properties. The minimal expected γ-ray flux from radio and star-forming galaxies within the Coma cluster is roughly an order of magnitude below the median sensitivity of our analysis.

langue originale	Anglais
Numéro d'article	149
journal	Astrophysical Journal
Volume	819
Numéro de publication	2
Les DOIs	https://doi.org/10.3847/0004-637X/819/2/149
état	Publié - 10 mars 2016

Accès au document

10.3847/0004-637X/819/2/149

Contient cette citation

Ackermann, M., Ajello, M., Albert, A., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bottacini, E., Bregeon, J., Bruel, P., Buehler, R., Caliandro, G. A., ... Rephaeli, Y. (2016). SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA. Astrophysical Journal, 819(2), Article 149. https://doi.org/10.3847/0004-637X/819/2/149

@article{9ecabd26563d453b954fbf8229610a87,

title = "SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA",

abstract = "We present results from γ-ray observations of the Coma cluster incorporating six years of Fermi-LAT data and the newly released {"}Pass 8{"} event-level analysis. Our analysis of the region reveals low-significance residual structures within the virial radius of the cluster that are too faint for a detailed investigation with the current data. Using a likelihood approach that is free of assumptions on the spectral shape we derive upper limits on the γ-ray flux that is expected from energetic particle interactions in the cluster. We also consider a benchmark spatial and spectral template motivated by models in which the observed radio halo is mostly emission by secondary electrons. In this case, the median expected and observed upper limits for the flux above 100 are 1.7 times;10-9 ph cm-2 s-1 and 5.2 times;10-9 ph cm-2 s-1 respectively (the latter corresponds to residual emission at the level of 1.8σ). These bounds are comparable to or higher than predicted levels of hadronic gamma-ray emission in cosmic-ray (CR) models with or without reacceleration of secondary electrons, although direct comparisons are sensitive to assumptions regarding the origin and propagation mode of CRs and magnetic field properties. The minimal expected γ-ray flux from radio and star-forming galaxies within the Coma cluster is roughly an order of magnitude below the median sensitivity of our analysis.",

keywords = "galaxies: clusters: individual (Coma), gamma rays: galaxies: cluster",

author = "M. Ackermann and M. Ajello and A. Albert and Atwood, \{W. B.\} and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and K. Bechtol and R. Bellazzini and E. Bissaldi and Blandford, \{R. D.\} and Bloom, \{E. D.\} and R. Bonino and E. Bottacini and J. Bregeon and P. Bruel and R. Buehler and Caliandro, \{G. A.\} and Cameron, \{R. A.\} and M. Caragiulo and Caraveo, \{P. A.\} and Casandjian, \{J. M.\} and E. Cavazzuti and C. Cecchi and E. Charles and A. Chekhtman and G. Chiaro and S. Ciprini and J. Cohen-Tanugi and J. Conrad and S. Cutini and F. D'Ammando and \{De Angelis\}, A. and \{De Palma\}, F. and R. Desiante and Digel, \{S. W.\} and \{Di Venere\}, L. and Drell, \{P. S.\} and C. Favuzzi and Fegan, \{S. J.\} and Y. Fukazawa and S. Funk and P. Fusco and F. Gargano and D. Gasparrini and N. Giglietto and F. Giordano and M. Giroletti and G. Godfrey and D. Green and Grenier, \{I. A.\} and S. Guiriec and E. Hays and Hewitt, \{J. W.\} and D. Horan and G. J{\'o}hannesson and M. Kuss and S. Larsson and L. Latronico and J. Li and L. Li and F. Longo and F. Loparco and Lovellette, \{M. N.\} and P. Lubrano and Madejski, \{G. M.\} and S. Maldera and A. Manfreda and M. Mayer and Mazziotta, \{M. N.\} and Michelson, \{P. F.\} and W. Mitthumsiri and T. Mizuno and Monzani, \{M. E.\} and A. Morselli and Moskalenko, \{I. V.\} and S. Murgia and E. Nuss and T. Ohsugi and M. Orienti and E. Orlando and Ormes, \{J. F.\} and D. Paneque and M. Pesce-Rollins and V. Petrosian and F. Piron and G. Pivato and Porter, \{T. A.\} and S. Rain{\`o} and R. Rando and M. Razzano and A. Reimer and O. Reimer and M. S{\'a}nchez-Conde and C. Sgr{\`o} and Siskind, \{E. J.\} and F. Spada and G. Spandre and P. Spinelli and H. Tajima and H. Takahashi and Thayer, \{J. B.\} and L. Tibaldo and Torres, \{D. F.\} and G. Tosti and E. Troja and G. Vianello and Wood, \{K. S.\} and S. Zimmer and Y. Rephaeli",

year = "2016",

month = mar,

day = "10",

doi = "10.3847/0004-637X/819/2/149",

language = "English",

volume = "819",

journal = "Astrophysical Journal",

issn = "0004-637X",

number = "2",

}

Ackermann, M, Ajello, M, Albert, A, Atwood, WB, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Bissaldi, E, Blandford, RD, Bloom, ED, Bonino, R, Bottacini, E, Bregeon, J, Bruel, P, Buehler, R, Caliandro, GA, Cameron, RA, Caragiulo, M, Caraveo, PA, Casandjian, JM, Cavazzuti, E, Cecchi, C, Charles, E, Chekhtman, A, Chiaro, G, Ciprini, S, Cohen-Tanugi, J, Conrad, J, Cutini, S, D'Ammando, F, De Angelis, A, De Palma, F, Desiante, R, Digel, SW, Di Venere, L, Drell, PS, Favuzzi, C, Fegan, SJ, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Giglietto, N, Giordano, F, Giroletti, M, Godfrey, G, Green, D, Grenier, IA, Guiriec, S, Hays, E, Hewitt, JW, Horan, D, Jóhannesson, G, Kuss, M, Larsson, S, Latronico, L, Li, J, Li, L, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Madejski, GM, Maldera, S, Manfreda, A, Mayer, M, Mazziotta, MN, Michelson, PF, Mitthumsiri, W, Mizuno, T, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nuss, E, Ohsugi, T, Orienti, M, Orlando, E, Ormes, JF, Paneque, D, Pesce-Rollins, M, Petrosian, V, Piron, F, Pivato, G, Porter, TA, Rainò, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Sánchez-Conde, M, Sgrò, C, Siskind, EJ, Spada, F, Spandre, G, Spinelli, P, Tajima, H, Takahashi, H, Thayer, JB, Tibaldo, L, Torres, DF, Tosti, G, Troja, E, Vianello, G, Wood, KS, Zimmer, S & Rephaeli, Y 2016, 'SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA', Astrophysical Journal, VOL. 819, Numéro 2, 149. https://doi.org/10.3847/0004-637X/819/2/149

TY - JOUR

T1 - SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA

AU - Ackermann, M.

AU - Ajello, M.

AU - Albert, A.

AU - Atwood, W. B.

AU - Baldini, L.

AU - Ballet, J.

AU - Barbiellini, G.

AU - Bastieri, D.

AU - Bechtol, K.

AU - Bellazzini, R.

AU - Bissaldi, E.

AU - Blandford, R. D.

AU - Bloom, E. D.

AU - Bonino, R.

AU - Bottacini, E.

AU - Bregeon, J.

AU - Bruel, P.

AU - Buehler, R.

AU - Caliandro, G. A.

AU - Cameron, R. A.

AU - Caragiulo, M.

AU - Caraveo, P. A.

AU - Casandjian, J. M.

AU - Cavazzuti, E.

AU - Cecchi, C.

AU - Charles, E.

AU - Chekhtman, A.

AU - Chiaro, G.

AU - Ciprini, S.

AU - Cohen-Tanugi, J.

AU - Conrad, J.

AU - Cutini, S.

AU - D'Ammando, F.

AU - De Angelis, A.

AU - De Palma, F.

AU - Desiante, R.

AU - Digel, S. W.

AU - Di Venere, L.

AU - Drell, P. S.

AU - Favuzzi, C.

AU - Fegan, S. J.

AU - Fukazawa, Y.

AU - Funk, S.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Giglietto, N.

AU - Giordano, F.

AU - Giroletti, M.

AU - Godfrey, G.

AU - Green, D.

AU - Grenier, I. A.

AU - Guiriec, S.

AU - Hays, E.

AU - Hewitt, J. W.

AU - Horan, D.

AU - Jóhannesson, G.

AU - Kuss, M.

AU - Larsson, S.

AU - Latronico, L.

AU - Li, J.

AU - Li, L.

AU - Longo, F.

AU - Loparco, F.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Madejski, G. M.

AU - Maldera, S.

AU - Manfreda, A.

AU - Mayer, M.

AU - Mazziotta, M. N.

AU - Michelson, P. F.

AU - Mitthumsiri, W.

AU - Mizuno, T.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Moskalenko, I. V.

AU - Murgia, S.

AU - Nuss, E.

AU - Ohsugi, T.

AU - Orienti, M.

AU - Orlando, E.

AU - Ormes, J. F.

AU - Paneque, D.

AU - Pesce-Rollins, M.

AU - Petrosian, V.

AU - Piron, F.

AU - Pivato, G.

AU - Porter, T. A.

AU - Rainò, S.

AU - Rando, R.

AU - Razzano, M.

AU - Reimer, A.

AU - Reimer, O.

AU - Sánchez-Conde, M.

AU - Sgrò, 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 - Tibaldo, L.

AU - Torres, D. F.

AU - Tosti, G.

AU - Troja, E.

AU - Vianello, G.

AU - Wood, K. S.

AU - Zimmer, S.

AU - Rephaeli, Y.

PY - 2016/3/10

Y1 - 2016/3/10

N2 - We present results from γ-ray observations of the Coma cluster incorporating six years of Fermi-LAT data and the newly released "Pass 8" event-level analysis. Our analysis of the region reveals low-significance residual structures within the virial radius of the cluster that are too faint for a detailed investigation with the current data. Using a likelihood approach that is free of assumptions on the spectral shape we derive upper limits on the γ-ray flux that is expected from energetic particle interactions in the cluster. We also consider a benchmark spatial and spectral template motivated by models in which the observed radio halo is mostly emission by secondary electrons. In this case, the median expected and observed upper limits for the flux above 100 are 1.7 times;10-9 ph cm-2 s-1 and 5.2 times;10-9 ph cm-2 s-1 respectively (the latter corresponds to residual emission at the level of 1.8σ). These bounds are comparable to or higher than predicted levels of hadronic gamma-ray emission in cosmic-ray (CR) models with or without reacceleration of secondary electrons, although direct comparisons are sensitive to assumptions regarding the origin and propagation mode of CRs and magnetic field properties. The minimal expected γ-ray flux from radio and star-forming galaxies within the Coma cluster is roughly an order of magnitude below the median sensitivity of our analysis.

AB - We present results from γ-ray observations of the Coma cluster incorporating six years of Fermi-LAT data and the newly released "Pass 8" event-level analysis. Our analysis of the region reveals low-significance residual structures within the virial radius of the cluster that are too faint for a detailed investigation with the current data. Using a likelihood approach that is free of assumptions on the spectral shape we derive upper limits on the γ-ray flux that is expected from energetic particle interactions in the cluster. We also consider a benchmark spatial and spectral template motivated by models in which the observed radio halo is mostly emission by secondary electrons. In this case, the median expected and observed upper limits for the flux above 100 are 1.7 times;10-9 ph cm-2 s-1 and 5.2 times;10-9 ph cm-2 s-1 respectively (the latter corresponds to residual emission at the level of 1.8σ). These bounds are comparable to or higher than predicted levels of hadronic gamma-ray emission in cosmic-ray (CR) models with or without reacceleration of secondary electrons, although direct comparisons are sensitive to assumptions regarding the origin and propagation mode of CRs and magnetic field properties. The minimal expected γ-ray flux from radio and star-forming galaxies within the Coma cluster is roughly an order of magnitude below the median sensitivity of our analysis.

KW - galaxies: clusters: individual (Coma)

KW - gamma rays: galaxies: cluster

U2 - 10.3847/0004-637X/819/2/149

DO - 10.3847/0004-637X/819/2/149

M3 - Article

AN - SCOPUS:84961123614

SN - 0004-637X

VL - 819

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 149

ER -

SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA

Résumé

Accès au document

Empreinte digitale

Contient cette citation