Γ-ray emission from the Perseus cluster of galaxies observed with the MAGIC telescopes

MAGIC Collaboration

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

The Perseus cluster of galaxies is a nearby cool-core cluster with an intra-clustermedium (ICM) characterized by very high central densities. The observation of the Perseus cluster with the MAGIC telescopes, during 85 h from 2009 to 2011, resulted in the discovery of 2 point-like sources at very high energy (>100 GeV, VHE) coinciding with the central radio galaxy NGC1275 and the radio galaxy IC310. The γ-ray properties of these 2 sources are presented, taking into account contemporaneous Fermi-LAT as well as multi-wavelength data. Flux variability and spectral energy distribution shapes indicate that the VHE γ-rays do not originate from large-scale interaction of the radio galaxies with ICM but more likely from the active nuclei of these two galaxies. They could be both misaligned version of BL Lac objects, the most common TeV AGN. Our results provide vital clues to understand emission mechanisms of such misaligned objects, and how they may be related to the beamed emission seen in BL Lacs. No evidence of large-scale VHE γ-ray emission from hadronic cosmic ray (CR) interactions with the ICM has been found. The flux upper limit above 1 TeV reaches the signal expected by some theoretical models, constraining the cluster CR physics. In the framework of the hadronicmodel of the radiomini-halos, this limit implies aminimal magnetic field ranging from 4-9μG for the central cluster region.

本文言語English
ホスト出版物のタイトルHigh Energy Gamma-Ray Astronomy - 5th International Meeting on High Energy Gamma-Ray Astronomy
ページ578-581
ページ数4
DOI
出版ステータスPublished - 2012
外部発表はい
イベント5th International Meeting on High Energy Gamma-Ray Astronomy - Heidelberg, Germany
継続期間: 2012 7月 92012 7月 13

出版物シリーズ

名前AIP Conference Proceedings
1505
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Conference

Conference5th International Meeting on High Energy Gamma-Ray Astronomy
国/地域Germany
CityHeidelberg
Period12/7/912/7/13

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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