SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA
© 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 struc...
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Earth and Planetary Sciences 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 |
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© 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. |
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Deutsche Elektronen-Synchrotron |
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Deutsche Elektronen-Synchrotron 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 |
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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 |
author_sort |
M. Ackermann |
title |
SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA |
title_short |
SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA |
title_full |
SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA |
title_fullStr |
SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA |
title_full_unstemmed |
SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA |
title_sort |
search for gamma-ray emission from the coma cluster with six years of fermi-lat data |
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2018 |
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https://repository.li.mahidol.ac.th/handle/123456789/43559 |
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1763497869739819008 |
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th-mahidol.435592019-03-14T15:04:37Z 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 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. Earth and Planetary Sciences © 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. 2018-12-11T02:44:26Z 2019-03-14T08:04:37Z 2018-12-11T02:44:26Z 2019-03-14T08:04:37Z 2016-03-10 Article Astrophysical Journal. Vol.819, No.2 (2016) 10.3847/0004-637X/819/2/149 15384357 0004637X 2-s2.0-84961123614 https://repository.li.mahidol.ac.th/handle/123456789/43559 Mahidol University SCOPUS https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84961123614&origin=inward |