GeV gamma-ray flux upper limits from clusters of galaxies

M. Ackermann; M. Ajello; A. Allafort; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; R. D. Blandford; P. Blasi; E. D. Bloom; E. Bonamente; A. W. Borgland; A. Bouvier; T. J. Brandt; J. Bregeon; M. Brigida; P. Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; S. Carrigan; J. M. Casandjian; E. Cavazzuti; C. Cecchi; Çelik; E. Charles; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; S. Colafrancesco; L. R. Cominsky; J. Conrad; C. D. Dermer; F. De Palma; E. Do Couto E Silva; P. S. Drell; R. Dubois; D. Dumora; Y. Edmonds; C. Farnier; C. Favuzzi; M. Frailis; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; N. Giglietto; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; I. A. Grenier; M. H. Grondin; S. Guiriec; D. Hadasch; A. K. Harding; M. Hayashida; E. Hays; D. Horan; R. E. Hughes; T. E. Jeltema; G. Jóhannesson; A. S. Johnson; T. J. Johnson; W. N. Johnson; T. Kamae; H. Katagiri; J. Kataoka; M. Kerr; J. Knödlseder; M. Kuss; J. Lande; L. Latronico; S. H. Lee; M. Lemoine-Goumard; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; G. M. Madejski; A. Makeev; M. N. Mazziotta; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; M. Naumann-Godo; P. L. Nolan; J. P. Norris; E. Nuss; T. Ohsugi; N. Omodei; E. Orlando; J. F. Ormes; M. Ozaki; D. Paneque; J. H. Panetta; M. Pepe; M. Pesce-Rollins; V. Petrosian; C. Pfrommer; F. Piron; T. A. Porter; S. Profumo; S. Rainò; R. Rando; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; J. Ripken; S. Ritz; A. Y. Rodriguez; R. W. Romani; M. Roth; H. F.W. Sadrozinski; A. Sander; P. M. Saz Parkinson; J. D. Scargle; C. Sgrò; E. J. Siskind; P. D. Smith; G. Spandre; P. Spinelli; J. L. Starck; Stawarz; M. S. Strickman; A. W. Strong; D. J. Suson; H. Tajima; H. Takahashi; T. Takahashi; T. Tanaka; J. B. Thayer; J. G. Thayer; L. Tibaldo; O. Tibolla; D. F. Torres; G. Tosti; A. Tramacere; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; V. Vasileiou; N. Vilchez; V. Vitale; A. P. Waite; P. Wang; B. L. Winer; K. S. Wood; Z. Yang; T. Ylinen; M. Ziegler

doi:10.1088/2041-8205/717/1/L71

GeV gamma-ray flux upper limits from clusters of galaxies

M. Ackermann
, M. Ajello
, A. Allafort
, L. Baldini
, J. Ballet
, G. Barbiellini
, D. Bastieri
, K. Bechtol
, R. Bellazzini
, R. D. Blandford
, P. Blasi
, E. D. Bloom
, E. Bonamente
, A. W. Borgland
, A. Bouvier
, T. J. Brandt
, J. Bregeon
, M. Brigida
, P. Bruel
, R. Buehler

S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, S. Carrigan, J. M. Casandjian, E. Cavazzuti, C. Cecchi, Çelik, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, S. Colafrancesco, L. R. Cominsky, J. Conrad, C. D. Dermer, F. De Palma, E. Do Couto E Silva, P. S. Drell, R. Dubois, D. Dumora, Y. Edmonds, C. Farnier, C. Favuzzi, M. Frailis, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, S. Guiriec, D. Hadasch, A. K. Harding, M. Hayashida, E. Hays, D. Horan, R. E. Hughes, T. E. Jeltema, G. Jóhannesson, A. S. Johnson, T. J. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, M. Kerr, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, S. H. Lee, M. Lemoine-Goumard, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, A. Makeev, M. N. Mazziotta, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, M. Naumann-Godo, P. L. Nolan, J. P. Norris, E. Nuss, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, J. H. Panetta, M. Pepe, M. Pesce-Rollins, V. Petrosian, C. Pfrommer, F. Piron, T. A. Porter, S. Profumo, S. Rainò, R. Rando, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, J. Ripken, S. Ritz, A. Y. Rodriguez, R. W. Romani, M. Roth, H. F.W. Sadrozinski, A. Sander, P. M. Saz Parkinson, J. D. Scargle, C. Sgrò, E. J. Siskind, P. D. Smith, G. Spandre, P. Spinelli, J. L. Starck, Stawarz, M. S. Strickman, A. W. Strong, D. J. Suson, H. Tajima, H. Takahashi, T. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, L. Tibaldo, O. Tibolla, D. F. Torres, G. Tosti, A. Tramacere, Y. Uchiyama, T. L. Usher, J. Vandenbroucke, V. Vasileiou, N. Vilchez, V. Vitale, A. P. Waite, P. Wang, B. L. Winer, K. S. Wood, Z. Yang, T. Ylinen, M. Ziegler

Kavli Institute for Particle Astrophysics and Cosmology
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Universite Paris-Saclay
INFN Sezione di Trieste
University of Trieste
INFN
University of Padova
Osservatorio Astrofisico Di Arcetri
INFN Sezione di Perugia
University of Perugia
CNRS
The Ohio State University
Politecnico di Bari
INFN Sezione di Bari
Campus UAB
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Science and Research Directorate
NASA Goddard Space Flight Center
Biochemical and Environmental Engineering
Naval Research Laboratory
George Mason University
National Research Council
Laboratoire Univers et Particules de Montpellier
Sonoma State University
Stockholm University
Oskar Klein Centre
Royal Swedish Academy of Sciences
Université Paris-Sud
Univ. Bordeaux
and Physics University of Udine
INAF-Trieste
Hiroshima University
INAF Istituto di Radioastronomia
Center for Space Plasma and Aeronomic Research
Pompeu Fabra University (UPF)
University of California at Santa Cruz
University of Maryland
Waseda University
University of Washington
INFN Roma Tor Vergata
University of Denver
Max Planck Institut für Extraterrestrische Physik
ISAS/JAXA
University of Toronto
Medical University of Innsbruck
NASA Ames Research Center
NYCB Real-Time Computing Inc.
Jagiellonian University
Purdue University Northwest
University of Würzburg
Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
University of Geneva
University of Rome “Tor Vergata”
KTH Royal Institute of Technology
University of Kalmar

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

158 Citations (Scopus)

Résumé

The detection of diffuse radio emission associated with clusters of galaxies indicates populations of relativistic leptons infusing the intraclustermedium (ICM). Those electrons and positrons are either injected into and accelerated directly in the ICM, or produced as secondary pairs by cosmic-ray ions scattering on ambient protons. Radiation mechanisms involving the energetic leptons together with the decay of neutral pions produced by hadronic interactions have the potential to produce abundant GeV photons. Here, we report on the search for GeV emission from clusters of galaxies using data collected by the Large Area Telescope on the FermiGamma-ray Space Telescope from 2008 August to 2010 February. Thirty-three galaxy clusters have been selected according to their proximity and high mass, X-ray flux and temperature, and indications of non-thermal activity for this study. We report upper limits on the photon flux in the range 0.2-100GeVtoward a sample of observed clusters (typical values (1-5)×10^-9 photon cm^-2 s^-1) considering both point-like and spatially resolved models for the high-energy emission and discuss how these results constrain the characteristics of energetic leptons and hadrons, and magnetic fields in the ICM. The volume-averaged relativistic-hadron-to-thermal energy density ratio is found to be <5%-10% in several clusters.

langue originale	Anglais
Pages (de - à)	L71-L78
journal	Astrophysical Journal Letters
Volume	717
Numéro de publication	1
Les DOIs	https://doi.org/10.1088/2041-8205/717/1/L71
état	Publié - 1 juil. 2010

Accès au document

10.1088/2041-8205/717/1/L71

Contient cette citation

Ackermann, M., Ajello, M., Allafort, A., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Blandford, R. D., Blasi, P., Bloom, E. D., Bonamente, E., Borgland, A. W., Bouvier, A., Brandt, T. J., Bregeon, J., Brigida, M., Bruel, P., ... Ziegler, M. (2010). GeV gamma-ray flux upper limits from clusters of galaxies. Astrophysical Journal Letters, 717(1), L71-L78. https://doi.org/10.1088/2041-8205/717/1/L71

@article{fa7428f456c443cb94a70ca0a254ec2a,

title = "GeV gamma-ray flux upper limits from clusters of galaxies",

abstract = "The detection of diffuse radio emission associated with clusters of galaxies indicates populations of relativistic leptons infusing the intraclustermedium (ICM). Those electrons and positrons are either injected into and accelerated directly in the ICM, or produced as secondary pairs by cosmic-ray ions scattering on ambient protons. Radiation mechanisms involving the energetic leptons together with the decay of neutral pions produced by hadronic interactions have the potential to produce abundant GeV photons. Here, we report on the search for GeV emission from clusters of galaxies using data collected by the Large Area Telescope on the FermiGamma-ray Space Telescope from 2008 August to 2010 February. Thirty-three galaxy clusters have been selected according to their proximity and high mass, X-ray flux and temperature, and indications of non-thermal activity for this study. We report upper limits on the photon flux in the range 0.2-100GeVtoward a sample of observed clusters (typical values (1-5){\texttimes}10-9 photon cm-2 s-1) considering both point-like and spatially resolved models for the high-energy emission and discuss how these results constrain the characteristics of energetic leptons and hadrons, and magnetic fields in the ICM. The volume-averaged relativistic-hadron-to-thermal energy density ratio is found to be <5\%-10\% in several clusters.",

keywords = "Cosmic rays, Galaxies: clusters: general, Gamma rays: galaxies: clusters, Radiation mechanisms: non-thermal",

author = "M. Ackermann and M. Ajello and A. Allafort and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and K. Bechtol and R. Bellazzini and Blandford, \{R. D.\} and P. Blasi and Bloom, \{E. D.\} and E. Bonamente and Borgland, \{A. W.\} and A. Bouvier and Brandt, \{T. J.\} and J. Bregeon and M. Brigida and P. Bruel and R. Buehler and S. Buson and Caliandro, \{G. A.\} and Cameron, \{R. A.\} and Caraveo, \{P. A.\} and S. Carrigan and Casandjian, \{J. M.\} and E. Cavazzuti and C. Cecchi and {\c C}elik and E. Charles and A. Chekhtman and Cheung, \{C. C.\} and J. Chiang and S. Ciprini and R. Claus and J. Cohen-Tanugi and S. Colafrancesco and Cominsky, \{L. R.\} and J. Conrad and Dermer, \{C. D.\} and \{De Palma\}, F. and \{Do Couto E Silva\}, E. and Drell, \{P. S.\} and R. Dubois and D. Dumora and Y. Edmonds and C. Farnier and C. Favuzzi and M. Frailis and Y. Fukazawa and S. Funk and P. Fusco and F. Gargano and D. Gasparrini and N. Gehrels and S. Germani and N. Giglietto and F. Giordano and M. Giroletti and T. Glanzman and G. Godfrey and Grenier, \{I. A.\} and Grondin, \{M. H.\} and S. Guiriec and D. Hadasch and Harding, \{A. K.\} and M. Hayashida and E. Hays and D. Horan and Hughes, \{R. E.\} and Jeltema, \{T. E.\} and G. J{\'o}hannesson and Johnson, \{A. S.\} and Johnson, \{T. J.\} and Johnson, \{W. N.\} and T. Kamae and H. Katagiri and J. Kataoka and M. Kerr and J. Kn{\"o}dlseder and M. Kuss and J. Lande and L. Latronico and Lee, \{S. H.\} and M. Lemoine-Goumard and F. Longo and F. Loparco and B. Lott and Lovellette, \{M. N.\} and P. Lubrano and Madejski, \{G. M.\} and A. Makeev and Mazziotta, \{M. N.\} and Michelson, \{P. F.\} and W. Mitthumsiri and T. Mizuno and Moiseev, \{A. A.\} and C. Monte and Monzani, \{M. E.\} and A. Morselli and Moskalenko, \{I. V.\} and S. Murgia and M. Naumann-Godo and Nolan, \{P. L.\} and Norris, \{J. P.\} and E. Nuss and T. Ohsugi and N. Omodei and E. Orlando and Ormes, \{J. F.\} and M. Ozaki and D. Paneque and Panetta, \{J. H.\} and M. Pepe and M. Pesce-Rollins and V. Petrosian and C. Pfrommer and F. Piron and Porter, \{T. A.\} and S. Profumo and S. Rain{\`o} and R. Rando and M. Razzano and A. Reimer and O. Reimer and T. Reposeur and J. Ripken and S. Ritz and Rodriguez, \{A. Y.\} and Romani, \{R. W.\} and M. Roth and Sadrozinski, \{H. F.W.\} and A. Sander and \{Saz Parkinson\}, \{P. M.\} and Scargle, \{J. D.\} and C. Sgr{\`o} and Siskind, \{E. J.\} and Smith, \{P. D.\} and G. Spandre and P. Spinelli and Starck, \{J. L.\} and Stawarz and Strickman, \{M. S.\} and Strong, \{A. W.\} and Suson, \{D. J.\} and H. Tajima and H. Takahashi and T. Takahashi and T. Tanaka and Thayer, \{J. B.\} and Thayer, \{J. G.\} and L. Tibaldo and O. Tibolla and Torres, \{D. F.\} and G. Tosti and A. Tramacere and Y. Uchiyama and Usher, \{T. L.\} and J. Vandenbroucke and V. Vasileiou and N. Vilchez and V. Vitale and Waite, \{A. P.\} and P. Wang and Winer, \{B. L.\} and Wood, \{K. S.\} and Z. Yang and T. Ylinen and M. Ziegler",

year = "2010",

month = jul,

day = "1",

doi = "10.1088/2041-8205/717/1/L71",

language = "English",

volume = "717",

pages = "L71--L78",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "1",

}

Ackermann, M, Ajello, M, Allafort, A, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Blandford, RD, Blasi, P, Bloom, ED, Bonamente, E, Borgland, AW, Bouvier, A, Brandt, TJ, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Carrigan, S, Casandjian, JM, Cavazzuti, E, Cecchi, C, Çelik, Charles, E, Chekhtman, A, Cheung, CC, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, Colafrancesco, S, Cominsky, LR, Conrad, J, Dermer, CD, De Palma, F, Do Couto E Silva, E, Drell, PS, Dubois, R, Dumora, D, Edmonds, Y, Farnier, C, Favuzzi, C, Frailis, M, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giglietto, N, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, IA, Grondin, MH, Guiriec, S, Hadasch, D, Harding, AK, Hayashida, M, Hays, E, Horan, D, Hughes, RE, Jeltema, TE, Jóhannesson, G, Johnson, AS, Johnson, TJ, Johnson, WN, Kamae, T, Katagiri, H, Kataoka, J, Kerr, M, Knödlseder, J, Kuss, M, Lande, J, Latronico, L, Lee, SH, Lemoine-Goumard, M, Longo, F, Loparco, F, Lott, B, Lovellette, MN, Lubrano, P, Madejski, GM, Makeev, A, Mazziotta, MN, Michelson, PF, Mitthumsiri, W, Mizuno, T, Moiseev, AA, Monte, C, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Naumann-Godo, M, Nolan, PL, Norris, JP, Nuss, E, Ohsugi, T, Omodei, N, Orlando, E, Ormes, JF, Ozaki, M, Paneque, D, Panetta, JH, Pepe, M, Pesce-Rollins, M, Petrosian, V, Pfrommer, C, Piron, F, Porter, TA, Profumo, S, Rainò, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Reposeur, T, Ripken, J, Ritz, S, Rodriguez, AY, Romani, RW, Roth, M, Sadrozinski, HFW, Sander, A, Saz Parkinson, PM, Scargle, JD, Sgrò, C, Siskind, EJ, Smith, PD, Spandre, G, Spinelli, P, Starck, JL, Stawarz, Strickman, MS, Strong, AW, Suson, DJ, Tajima, H, Takahashi, H, Takahashi, T, Tanaka, T, Thayer, JB, Thayer, JG, Tibaldo, L, Tibolla, O, Torres, DF, Tosti, G, Tramacere, A, Uchiyama, Y, Usher, TL, Vandenbroucke, J, Vasileiou, V, Vilchez, N, Vitale, V, Waite, AP, Wang, P, Winer, BL, Wood, KS, Yang, Z, Ylinen, T & Ziegler, M 2010, 'GeV gamma-ray flux upper limits from clusters of galaxies', Astrophysical Journal Letters, VOL. 717, Numéro 1, p. L71-L78. https://doi.org/10.1088/2041-8205/717/1/L71

TY - JOUR

T1 - GeV gamma-ray flux upper limits from clusters of galaxies

AU - Ackermann, M.

AU - Ajello, M.

AU - Allafort, A.

AU - Baldini, L.

AU - Ballet, J.

AU - Barbiellini, G.

AU - Bastieri, D.

AU - Bechtol, K.

AU - Bellazzini, R.

AU - Blandford, R. D.

AU - Blasi, P.

AU - Bloom, E. D.

AU - Bonamente, E.

AU - Borgland, A. W.

AU - Bouvier, A.

AU - Brandt, T. J.

AU - Bregeon, J.

AU - Brigida, M.

AU - Bruel, P.

AU - Buehler, R.

AU - Buson, S.

AU - Caliandro, G. A.

AU - Cameron, R. A.

AU - Caraveo, P. A.

AU - Carrigan, S.

AU - Casandjian, J. M.

AU - Cavazzuti, E.

AU - Cecchi, C.

AU - Çelik,

AU - Charles, E.

AU - Chekhtman, A.

AU - Cheung, C. C.

AU - Chiang, J.

AU - Ciprini, S.

AU - Claus, R.

AU - Cohen-Tanugi, J.

AU - Colafrancesco, S.

AU - Cominsky, L. R.

AU - Conrad, J.

AU - Dermer, C. D.

AU - De Palma, F.

AU - Do Couto E Silva, E.

AU - Drell, P. S.

AU - Dubois, R.

AU - Dumora, D.

AU - Edmonds, Y.

AU - Farnier, C.

AU - Favuzzi, C.

AU - Frailis, M.

AU - Fukazawa, Y.

AU - Funk, S.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Gehrels, N.

AU - Germani, S.

AU - Giglietto, N.

AU - Giordano, F.

AU - Giroletti, M.

AU - Glanzman, T.

AU - Godfrey, G.

AU - Grenier, I. A.

AU - Grondin, M. H.

AU - Guiriec, S.

AU - Hadasch, D.

AU - Harding, A. K.

AU - Hayashida, M.

AU - Hays, E.

AU - Horan, D.

AU - Hughes, R. E.

AU - Jeltema, T. E.

AU - Jóhannesson, G.

AU - Johnson, A. S.

AU - Johnson, T. J.

AU - Johnson, W. N.

AU - Kamae, T.

AU - Katagiri, H.

AU - Kataoka, J.

AU - Kerr, M.

AU - Knödlseder, J.

AU - Kuss, M.

AU - Lande, J.

AU - Latronico, L.

AU - Lee, S. H.

AU - Lemoine-Goumard, M.

AU - Longo, F.

AU - Loparco, F.

AU - Lott, B.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Madejski, G. M.

AU - Makeev, A.

AU - Mazziotta, M. N.

AU - Michelson, P. F.

AU - Mitthumsiri, W.

AU - Mizuno, T.

AU - Moiseev, A. A.

AU - Monte, C.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Moskalenko, I. V.

AU - Murgia, S.

AU - Naumann-Godo, M.

AU - Nolan, P. L.

AU - Norris, J. P.

AU - Nuss, E.

AU - Ohsugi, T.

AU - Omodei, N.

AU - Orlando, E.

AU - Ormes, J. F.

AU - Ozaki, M.

AU - Paneque, D.

AU - Panetta, J. H.

AU - Pepe, M.

AU - Pesce-Rollins, M.

AU - Petrosian, V.

AU - Pfrommer, C.

AU - Piron, F.

AU - Porter, T. A.

AU - Profumo, S.

AU - Rainò, S.

AU - Rando, R.

AU - Razzano, M.

AU - Reimer, A.

AU - Reimer, O.

AU - Reposeur, T.

AU - Ripken, J.

AU - Ritz, S.

AU - Rodriguez, A. Y.

AU - Romani, R. W.

AU - Roth, M.

AU - Sadrozinski, H. F.W.

AU - Sander, A.

AU - Saz Parkinson, P. M.

AU - Scargle, J. D.

AU - Sgrò, C.

AU - Siskind, E. J.

AU - Smith, P. D.

AU - Spandre, G.

AU - Spinelli, P.

AU - Starck, J. L.

AU - Stawarz,

AU - Strickman, M. S.

AU - Strong, A. W.

AU - Suson, D. J.

AU - Tajima, H.

AU - Takahashi, H.

AU - Takahashi, T.

AU - Tanaka, T.

AU - Thayer, J. B.

AU - Thayer, J. G.

AU - Tibaldo, L.

AU - Tibolla, O.

AU - Torres, D. F.

AU - Tosti, G.

AU - Tramacere, A.

AU - Uchiyama, Y.

AU - Usher, T. L.

AU - Vandenbroucke, J.

AU - Vasileiou, V.

AU - Vilchez, N.

AU - Vitale, V.

AU - Waite, A. P.

AU - Wang, P.

AU - Winer, B. L.

AU - Wood, K. S.

AU - Yang, Z.

AU - Ylinen, T.

AU - Ziegler, M.

PY - 2010/7/1

Y1 - 2010/7/1

N2 - The detection of diffuse radio emission associated with clusters of galaxies indicates populations of relativistic leptons infusing the intraclustermedium (ICM). Those electrons and positrons are either injected into and accelerated directly in the ICM, or produced as secondary pairs by cosmic-ray ions scattering on ambient protons. Radiation mechanisms involving the energetic leptons together with the decay of neutral pions produced by hadronic interactions have the potential to produce abundant GeV photons. Here, we report on the search for GeV emission from clusters of galaxies using data collected by the Large Area Telescope on the FermiGamma-ray Space Telescope from 2008 August to 2010 February. Thirty-three galaxy clusters have been selected according to their proximity and high mass, X-ray flux and temperature, and indications of non-thermal activity for this study. We report upper limits on the photon flux in the range 0.2-100GeVtoward a sample of observed clusters (typical values (1-5)×10-9 photon cm-2 s-1) considering both point-like and spatially resolved models for the high-energy emission and discuss how these results constrain the characteristics of energetic leptons and hadrons, and magnetic fields in the ICM. The volume-averaged relativistic-hadron-to-thermal energy density ratio is found to be <5%-10% in several clusters.

AB - The detection of diffuse radio emission associated with clusters of galaxies indicates populations of relativistic leptons infusing the intraclustermedium (ICM). Those electrons and positrons are either injected into and accelerated directly in the ICM, or produced as secondary pairs by cosmic-ray ions scattering on ambient protons. Radiation mechanisms involving the energetic leptons together with the decay of neutral pions produced by hadronic interactions have the potential to produce abundant GeV photons. Here, we report on the search for GeV emission from clusters of galaxies using data collected by the Large Area Telescope on the FermiGamma-ray Space Telescope from 2008 August to 2010 February. Thirty-three galaxy clusters have been selected according to their proximity and high mass, X-ray flux and temperature, and indications of non-thermal activity for this study. We report upper limits on the photon flux in the range 0.2-100GeVtoward a sample of observed clusters (typical values (1-5)×10-9 photon cm-2 s-1) considering both point-like and spatially resolved models for the high-energy emission and discuss how these results constrain the characteristics of energetic leptons and hadrons, and magnetic fields in the ICM. The volume-averaged relativistic-hadron-to-thermal energy density ratio is found to be <5%-10% in several clusters.

KW - Cosmic rays

KW - Galaxies: clusters: general

KW - Gamma rays: galaxies: clusters

KW - Radiation mechanisms: non-thermal

U2 - 10.1088/2041-8205/717/1/L71

DO - 10.1088/2041-8205/717/1/L71

M3 - Article

AN - SCOPUS:78650149596

SN - 2041-8205

VL - 717

SP - L71-L78

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

ER -

GeV gamma-ray flux upper limits from clusters of galaxies

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