Thermal and Nonthermal Nature of the Soft Excess Emission from Sersic 159‐03 Observed withXMM‐Newton | Zendy

Massimiliano Bonamente | Zendy; Richard Lieu | Zendy; Jonathan P. D. Mittaz | Zendy; J. S. Kaastra | Zendy; J. Nevalainen | Zendy

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Thermal and Nonthermal Nature of the Soft Excess Emission from Sersic 159‐03 Observed withXMM‐Newton

Author(s) -

Massimiliano Bonamente,

Richard Lieu,

Jonathan P. D. Mittaz,

J. S. Kaastra,

J. Nevalainen

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/430776

Subject(s) - physics , astrophysics , cosmic microwave background , electron , population , metallicity , compton scattering , cosmic cancer database , thermal , cosmic ray , nuclear physics , galaxy , anisotropy , optics , meteorology , demography , sociology

Several nearby clusters exhibit an excess of soft X-ray radiation whichcannot be attributed to the hot virialized intra-cluster medium. There is noconsensus to date on the origin of the excess emission: it could be either ofthermal origin, or due to an inverse Compton scattering of the cosmic microwavebackground. Using high resolution XMM-Newton data of Sersic 159-03 we firstshow that strong soft excess emission is detected out to a radial distance of0.9 Mpc. The data are interpreted using the two viable models available, i.e.,by invoking a warm reservoir of thermal gas, or relativistic electrons whichare part of a cosmic ray population. The thermal interpretation of the excessemission, slightly favored by the goodness-of-fit analysis, indicates that thewarm gas responsible for the emission is high in mass and low in metallicity.Comment: ApJ in pres

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