Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cha%26a..30..243x&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 30, Issue 3, p. 243-255.
Astronomy and Astrophysics
Astrophysics
Scientific paper
By analyzing the Chandra data of the central region of the galaxy cluster PKS 0745-191, the properties of a patch of bright X-ray gas distributed along the radio structure in the west of the central galaxy are investigated. This gas is found to be cooler and denser than the ambient gas. According to the calculation based on radio observations, the pressure gradient of the radio gas in the west is greater than that in the east. It means that there is interaction between that patch of cool X-ray gas and the radio gas. The cool gas is either formed by outer cool gas supported and disturbed by the radio gas, or is brought out from the central galaxy by radio buoyant bubbles. Assuming that the gas is in pressure-gravity balance, the volume filling factor of the X-ray gas in the central region is calculated to be b = 0.69 ± 0.28, and the properties of the relativistic particles in the radio gas, as well as the expansion effect of the radio gas on the cooling flow, are discussed.
chen Yong
Xiang Fei
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