Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-03-17
Astrophys.J.696:1886-1891,2009
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
ApJ in press, 6 pages, emulateapj style
Scientific paper
10.1088/0004-637X/696/2/1886
RASS data near the North Galactic Pole was analyzed in order to study the large-scale distribution of soft X-ray emission from the Coma cluster. These RASS data constitute the only available X-ray observations of Coma that feature an in situ -- temporally and spatially contiguous -- background, with unlimited and continuous radial coverage. These unique characteristics of the RASS data are used to deliver a final assessment on whether the soft excess previously detected in the Coma cluster is due to background subtraction errors, or not. This paper confirms the presence of soft X-ray excess associated with Coma, and reports the detection of 1/4 keV band excess out to 5 Mpc from the cluster center, the largest soft excess halo discovered to date. We propose that the emission is related to filaments that converge towards Coma, and generated either by non-thermal radiation caused by accretion shocks, or by thermal emission from the filaments themselves.
Bonamente Max
Bulbul Esra
Lieu Richard
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