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

Issued Date

2016-03-10

Resource Type

Article

ISSN

15384357
0004637X

DOI

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

Other identifier(s)

2-s2.0-84961123614

Rights

Mahidol University

Rights Holder(s)

SCOPUS

Bibliographic Citation

Astrophysical Journal. Vol.819, No.2 (2016)

Suggested Citation

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 SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA. Astrophysical Journal. Vol.819, No.2 (2016). doi:10.3847/0004-637X/819/2/149 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/43559

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Title

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

Author(s)

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

Other Contributor(s)

Deutsche Elektronen-Synchrotron
 Clemson University
 Kavli Institute for Particle Astrophysics and Cosmology
 Santa Cruz Institute for Particle Physics
 Università di Pisa
 Universite Paris 7- Denis Diderot
 Istituto Nazionale di Fisica Nucleare, Roma
 Universita degli Studi di Trieste
 Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
 Università degli Studi di Padova
 University of Wisconsin Madison
 Istituto Nazionale Di Fisica Nucleare, Sezione di Pisa
 Università degli Studi di Torino
 Laboratoire Univers et Particules de Montpellier
 Laboratoire Leprince-Ringuet
 Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
 Università degli Studi di Bari
 INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
 Agenzia Spaziale Italiana
 Universita degli Studi di Perugia
 George Mason University, Fairfax Campus
 Stockholms universitet
 Oskar Klein Centre for Cosmoparticle Physics
 Osservatorio Astronomico di Roma
 Istituto Di Radioastronomia, Bologna
 Alma Mater Studiorum Università di Bologna
 Universita degli Studi di Udine
 Università degli Studi di Napoli Federico II
 Hiroshima University
 Erlangen Centre for Astroparticle Physics
 University of Maryland
 NASA Goddard Space Flight Center
 University of North Florida
 University Science Institute Reykjavik
 The Royal Institute of Technology (KTH)
 Universitat Autònoma de Barcelona
 Naval Research Laboratory
 Mahidol University
 University of California, Irvine
 University of Denver
 Max Planck Institut fur Physik (Werner-Heisenberg-Institut)
 Medizinische Universitat Innsbruck
 NYCB Realtime Computing Inc.

Abstract

© 2016. The American Astronomical Society. All rights reserved.. 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.

Keyword(s)

Earth and Planetary Sciences

Availability

URI

https://repository.li.mahidol.ac.th/handle/20.500.14594/43559

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Scopus 2016-2017