Related papers: Hard X-Ray Radiation in the Coma Cluster Spectrum

X-ray Cluster Associated with the z=1.063 CSS Quasar 3C 186: The Jet is NOT Frustrated

We report the Chandra discovery of an X-ray cluster at redshift z = 1.063 associated with the Compact Steep Spectrum radio loud quasar 3C 186 (Q0740+380). Diffuse X-ray emission is detected out to ~120 kpc from the quasar and contains…

Astrophysics · Physics 2009-11-11 Aneta Siemiginowska , C. C. Cheung , Stephanie LaMassa , D. J. Burke , Thomas L. Aldcroft , Jill Bechtold , Martin Elvis , D. M. Worrall , ;

Relativistic protons in the Coma galaxy cluster: first gamma-ray constraints ever on turbulent reacceleration

The Fermi-LAT collaboration recently published deep upper limits to the gamma-ray emission of the Coma cluster, a cluster that hosts the prototype of giant radio halos. In this paper we extend previous studies and use a formalism that…

High Energy Astrophysical Phenomena · Physics 2017-09-20 G. Brunetti , S. Zimmer , F. Zandanel

Constraints on the multi-TeV particle population in the Coma Galaxy Cluster with H.E.S.S. observations

The H.E.S.S. (High Energy Stereoscopic System) telescopes observed Coma for ~8hr in a search for gamma-ray emission at energies >1TeV. The large 3.5deg FWHM field of view of H.E.S.S. is ideal for viewing a range of targets at various sizes…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 The HESS Collaboration , F. A. Aharonian

Nonthermal Activity and Particle Acceleration in Clusters of Galaxies

Evidence for nonthermal activity in clusters of galaxies is well established from radio observations of synchrotron emission by relativistic electrons, and new windows (in EUV and Hard X-ray ranges) have provided more powerful tools for its…

Astrophysics · Physics 2007-05-23 Vahe' Petrosian

Forty-Seven Milky Way-Sized, Extremely Diffuse Galaxies in the Coma Cluster

We report the discovery of 47 low surface brightness objects in deep images of a 3 x 3 degree field centered on the Coma cluster, obtained with the Dragonfly Telephoto Array. The objects have central surface brightness mu(g,0) ranging from…

Astrophysics of Galaxies · Physics 2015-06-23 Pieter van Dokkum , Roberto Abraham , Allison Merritt , Jielai Zhang , Marla Geha , Charlie Conroy

Constraining the Cosmic-ray Energy Based on Observations of Nearby Galaxy Clusters by LHAASO

Galaxy clusters act as reservoirs of high-energy cosmic rays (CRs). As CRs propagate through the intracluster medium, they generate diffuse $\gamma$-rays detectable by arrays such as LHAASO. These $\gamma$-rays result from proton-proton…

High Energy Astrophysical Phenomena · Physics 2026-01-07 The LHAASO Collaboration , Zhen Cao , F. Aharonian , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , W. Bian , J. Blunier , A. V. Bukevich , C. M. Cai , Y. Y. Cai , W. Y. Cao , Zhe Cao , J. Chang , J. F. Chang , E. S. Chen , G. H. Chen , H. K. Chen , L. F. Chen , Liang Chen , Long Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , X. B. Chen , X. J. Chen , X. P. Chen , Y. Chen , N. Cheng , Q. Y. Cheng , Y. D. Cheng , M. Y. Cui , S. W. Cui , X. H. Cui , Y. D. Cui , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , Y. X. Diao , A. J. Dong , X. Q. Dong , K. K. Duan , J. H. Fan , Y. Z. Fan , J. Fang , J. H. Fang , K. Fang , C. F. Feng , H. Feng , L. Feng , S. H. Feng , X. T. Feng , Y. Feng , Y. L. Feng , S. Gabici , B. Gao , Q. Gao , W. Gao , W. K. Gao , M. M. Ge , T. T. Ge , L. S. Geng , G. Giacinti , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Guo , J. Guo , K. J. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , R. P. Han , O. A. Hannuksela , M. Hasan , H. H. He , H. N. He , J. Y. He , X. Y. He , Y. He , S. Hernández-Cadena , B. W. Hou , C. Hou , X. Hou , H. B. Hu , S. C. Hu , C. Huang , D. H. Huang , J. J. Huang , X. L. Huang , X. T. Huang , X. Y. Huang , Y. Huang , Y. Y. Huang , A. Inventar , X. L. Ji , H. Y. Jia , K. Jia , H. B. Jiang , K. Jiang , X. W. Jiang , Z. J. Jiang , M. Jin , S. Kaci , M. M. Kang , I. Karpikov , D. Khangulyan , D. Kuleshov , K. Kurinov , Cheng Li , Cong Li , D. Li , F. Li , H. B. Li , H. C. Li , Jian Li , Jie Li , K. Li , L. Li , R. L. Li , S. D. Li , T. Y. Li , W. L. Li , X. R. Li , Xin Li , Y. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , D. B. Liu , H. Liu , J. Liu , J. L. Liu , J. R. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , X. Liu , Y. Liu , Y. Liu , Y. N. Liu , Y. Q. Lou , Q. Luo , Y. Luo , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , I. O. Maliy , J. R. Mao , Z. Min , W. Mitthumsiri , Y. Mizuno , G. B. Mou , A. Neronov , K. C. Y. Ng , M. Y. Ni , L. Nie , L. J. Ou , Z. W. Ou , P. Pattarakijwanich , Z. Y. Pei , D. Y. Peng , J. C. Qi , M. Y. Qi , J. J. Qin , D. Qu , A. Raza , C. Y. Ren , D. Ruffolo , A. Sáiz , D. Savchenko , D. Semikoz , L. Shao , O. Shchegolev , Y. Z. Shen , X. D. Sheng , Z. D. Shi , F. W. Shu , H. C. Song , Yu. V. Stenkin , V. Stepanov , Y. Su , D. X. Sun , H. Sun , J. X. Sun , Q. N. Sun , X. N. Sun , Z. B. Sun , N. H. Tabasam , J. Takata , P. H. T. Tam , H. B. Tan , Q. W. Tang , R. Tang , Z. B. Tang , W. W. Tian , C. N. Tong , L. H. Wan , C. Wang , D. H. Wang , G. W. Wang , H. G. Wang , J. C. Wang , K. Wang , Kai Wang , Kai Wang , L. P. Wang , L. Y. Wang , L. Y. Wang , R. Wang , W. Wang , X. G. Wang , X. J. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Z. H. Wang , Z. X. Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , S. S. Weng , C. Y. Wu , H. R. Wu , Q. W. Wu , S. Wu , X. F. Wu , Y. S. Wu , S. Q. Xi , J. Xia , J. J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , Y. F. Xiao , Y. L. Xin , H. D. Xing , Y. Xing , D. R. Xiong , B. N. Xu , C. Y. Xu , D. L. Xu , R. F. Xu , R. X. Xu , S. S. Xu , W. L. Xu , L. Xue , D. H. Yan , T. Yan , C. W. Yang , C. Y. Yang , F. F. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , W. X. Yang , Z. H. Yang , Z. G. Yao , X. A. Ye , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Q. Yuan , H. Yue , H. D. Zeng , T. X. Zeng , W. Zeng , X. T. Zeng , M. Zha , B. B. Zhang , B. T. Zhang , C. Zhang , H. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , J. Y. Zhang , Li Zhang , P. F. Zhang , R. Zhang , S. R. Zhang , S. S. Zhang , S. Y. Zhang , W. Zhang , W. Y. Zhang , X. Zhang , X. P. Zhang , Yi Zhang , Yong Zhang , Z. P. Zhang , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , X. H. Zhao , Z. H. Zhao , F. Zheng , T. C. Zheng , B. Zhou , H. Zhou , J. N. Zhou , M. Zhou , P. Zhou , R. Zhou , X. X. Zhou , X. X. Zhou , B. Y. Zhu , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , Y. C. Zou , X. Zuo

Searching for the inverse-Compton emission from bright cluster-centre radio galaxies

We use deep archival Chandra and XMM-Newton observations of three of the brightest cluster-centre radio galaxies in the sky, Cygnus A, Hercules A and Hydra A, to search for inverse-Compton emission from the population of electrons…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 M. J. Hardcastle , J. H. Croston

Fields and Filaments in the Core of the Centaurus Cluster

We present high resolution images of the Faraday Rotation Measure (RM) structure of the radio galaxy PKS 1246-410, at the center of the Centaurus cluster. Comparison with Halpha-line and soft X-ray emission reveals a correspondence between…

Astrophysics · Physics 2009-11-13 G. B. Taylor , A. C. Fabian , G. Gentile , S. W. Allen , C. Crawford , J. S. Sanders

The hard X-ray emission of X Per

We present an analysis of the spectral properties of the peculiar X-ray pulsar X Per based on INTEGRAL observations. We show that the source exhibits an unusually hard spectrum and is confidently detected by ISGRI up to more than 100 keV.…

High Energy Astrophysical Phenomena · Physics 2012-03-23 V. Doroshenko , A. Santangelo , I. Kreykenbohm , R. Doroshenko

Chandra detection of reflected X-ray emission from the type 2 QSO in IRAS 09104+4109

We present X-ray imaging spectroscopy of the extremely luminous infrared galaxy IRAS 09104+4109 (z=0.442) obtained with the Chandra X-ray Observatory. With the arcsec resolution of Chandra, an unresolved source at the nucleus is separated…

Astrophysics · Physics 2009-10-31 K. Iwasawa , A. C. Fabian , S. Ettori

South-West extension of the hard X-ray emission from the Coma cluster

We explore the morphology of hard (18-30 keV) X-ray emission from the Coma cluster of galaxies. We analyze a deep (1.1 Ms) observation of the Coma cluster with the ISGRI imager on board the \emph{INTEGRAL} satellite. We show that the source…

Astrophysics · Physics 2007-09-03 D. Eckert , A. Neronov , T. J. -L. Courvoisier , N. Produit

Constraints on the Intracluster Dust Emission in the Coma Cluster of Galaxies

We have undertaken a search for the infrared emission from the intracluster dust in the Coma cluster of galaxies by the Multiband Imaging Photometer for Spitzer. Our observations yield the deepest mid and far-infrared images of a galaxy…

Astrophysics of Galaxies · Physics 2011-02-11 T. Kitayama , Y. Ito , Y. Okada , H. Kaneda , H. Takahashi , N. Ota , T. Onaka , Y. Y. Tajiri , H. Nagata , K. Yamada

Diagnostic Signatures of Radio and HXR Emission on Particle Acceleration Processes in the Coma Cluster

We investigate theoretical models for the radio halo and hard X-ray (HXR) excess in the Coma galaxy cluster. Time-independent and time-dependent re-acceleration models for relativistic electrons have been carried out to study the formation…

Astrophysics · Physics 2009-11-10 Ping-Hung Kuo , Chorng-Yuan Hwang , Wing-Huen Ip

Hard X-ray Properties of the Merging Cluster Abell 3667 as Observed with Suzaku

Wide-band Suzaku data on the merging cluster Abell 3667 were examined for hard X-ray emission in excess to the known thermal component. Suzaku detected X-ray signals in the wide energy band from 0.5 to 40 keV. The hard X-ray (> 10 keV) flux…

Astrophysics · Physics 2015-05-13 Kazuhiro Nakazawa , Craig L. Sarazin , Madoka Kawaharada , Takao Kitaguchi , Sho Okuyama , Kazuo Makishima , Naomi Kawano , Yasushi Fukazawa , Susumu Inoue , Motokazu Takizawa , Daniel R. Wik , Alexis Finoguenov , Tracy E. Clarke

Galactic Energetic Particles and Their Radiative Yields in Clusters

As energetic particles diffuse out of radio and star-forming galaxies (SFGs), their intracluster density builds up to a level that could account for a substantial part or all the emission from a radio halo. We calculate the particle…

High Energy Astrophysical Phenomena · Physics 2016-06-01 Yoel Rephaeli , Sharon Sadeh

The soft X-ray emission in a large sample of galaxy clusters with ROSAT PSPC

The study of soft X-ray emission of 38 X-ray selected galaxy clusters observed by ROSAT PSPC indicates that the soft excess phenomenon may be a common occurrence in galaxy clusters. Excess soft X-ray radiation, above the contribution from…

Astrophysics · Physics 2015-06-24 M. Bonamente , R. Lieu , M. K. Joy , J. H. Nevalainen

The X-ray luminosity function of galaxies in the Coma cluster

The XMM-Newton survey of the Coma cluster of galaxies covers an area of 1.86 square degrees with a mosaic of 16 pointings and has a total useful integration time of 400 ksec. Detected X-ray sources with extent less than 10" were correlated…

Astrophysics · Physics 2009-11-10 A. Finoguenov , U. G. Briel , J. P. Henry , G. Gavazzi , J. Iglesias-Paramo , A. Boselli

The HST/ACS Coma Cluster Survey. II. Data Description and Source Catalogs

The Coma cluster was the target of a HST-ACS Treasury program designed for deep imaging in the F475W and F814W passbands. Although our survey was interrupted by the ACS instrument failure in 2007, the partially completed survey still covers…

Astrophysics of Galaxies · Physics 2015-05-19 Derek Hammer , Gijs Verdoes Kleijn , Carlos Hoyos , Mark den Brok , Marc Balcells , Henry C. Ferguson , Paul Goudfrooij , David Carter , Rafael Guzman , Reynier F. Peletier , Russell J. Smith , Alister W. Graham , Neil Trentham , Eric Peng , Thomas H. Puzia , John R. Lucey , Shardha Jogee , Alfonso L. Aguerri , Dan Batcheldor , Terry J. Bridges , Jonathan I. Davies , Carlos del Burgo , Peter Erwin , Ann Hornschemeier , Michael J. Hudson , Avon Huxor , Leigh Jenkins , Arna Karick , Habib Khosroshahi , Ehsan Kourkchi , Yutaka Komiyama , Jennifer Lotz , Ronald O. Marzke , Irina Marinova , Ana Matkovic , David Merritt , Bryan W. Miller , Neal A. Miller , Bahram Mobasher , Mustapha Mouhcine , Sadanori Okamura , Sue Percival , Steven Phillipps , Bianca M. Poggianti , James Price , Ray M. Sharples , R. Brent Tully , Edwin Valentijn

A NuSTAR observation of the center of the Coma Cluster

We present the results of a 55ks NuSTAR observation of the core of the Coma Cluster. The global spectrum can be explained by thermal gas emission, with a conservative 90% upper limit to non-thermal inverse Compton (IC) emission of $5.1…

High Energy Astrophysical Phenomena · Physics 2015-06-23 F. Gastaldello , D. R. Wik , S. Molendi , N. J. Westergaard , A. Hornstrup , G. Madejski , D. D. M. Ferreira , S. E. Boggs , F. E. Christensen , W. W. Craig , B. W. Grefenstette , C. J. Hailey , F. A. Harrison , K. K. Madsen , D. Stern , W. W. Zhang

X-ray Constraints on Cluster Magnetic Fields

Lower limits to the intracluster magnetic field are derived from modeling broad band X-ray spectra of 6 galaxy clusters with radio halos (A401, A754, A1367, Coma (A1656), A2256, and A2319). The 0.7 - 10 keV spectra for all clusters were…

Astrophysics · Physics 2015-06-24 Mark Henriksen