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
Department of Physics and Astronomy
Clemson University
Department of Physics
Kavli Institute for Particle Astrophysics and Cosmology
Department of Physics and Department of Astronomy and Astrophysics
University of California at Santa Cruz
Istituto Nazionale di Fisica Nucleare
University of Pisa
Universite Paris-Saclay
INFN Gruppo Collegato di Udine
INFN Sezione di Trieste
Dipartimento di Fisica
University of Trieste
INFN
INFN
Dipartimento di Fisica e Astronomia G. Galilei
University of Padova
University of Wisconsin-Madison
INFN
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
INFN
INFN Sezione di Bari
Sezione di Torino
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
Sezione di Perugia
INFN Sezione di Perugia
INFM CRS-SOFT
University of Perugia
George Mason University
Department of Physics
Stockholm University
Oskar Klein Centre
Osservatorio Astronomico di Roma
INAF Istituto di Radioastronomia
Dipartimento di Astronomia
University of Bologna
INFN Gruppo Collegato di Udine
and Physics University of Udine
Università Telematica Pegaso
Department of Physical Science
Hiroshima University
Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen
University of Maryland
NASA Goddard Space Flight Center
Department of Physics
University of North Florida
University of Iceland
Physics Department
KTH Royal Institute of Technology
University of Sheffield
Space Science Division
Naval Research Laboratory
Department of Physics
Faculty of Science, Mahidol University
Hiroshima Astrophysical Science Center
Sezione di Roma
Department of Physics and Astronomy
Long Beach VA and University of California
Department of Physics and Astronomy
University of Denver
Max-Planck-Institut für Physik
Medical University of Innsbruck
NYCB Real-Time Computing Inc.
Solar-Terrestrial Environment Laboratory
Nagoya University
Max-Planck-Institut für Kernphysik
Pompeu Fabra University (UPF)
Tel Aviv University
University of California at San Diego

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

108 Citations (Scopus)

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.

Original language	English
Article number	149
Journal	Astrophysical Journal
Volume	819
Issue number	2
DOIs	https://doi.org/10.3847/0004-637X/819/2/149
Publication status	Published - 10 Mar 2016

Keywords

galaxies: clusters: individual (Coma)
gamma rays: galaxies: cluster

Access to Document

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

Cite this

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",

publisher = "American Astronomical Society",

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, no. 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

Abstract

Keywords

Access to Document

Fingerprint

Cite this