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24 April 2024 |
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Cen A and its interaction with the x-ray emitting interstellar medium | | D.M. Worrall
; R.P. Kraft
; M. Birkinshaw
; M.J. Hardcastle
; W.R. Forman
; C. Jones
; S.S. Murray
; | | Date: |
12 Oct 2004 | | Subject: | astro-ph | | Abstract: | As the closest radio galaxy, Centaurus A is a powerful laboratory for the X-ray study of radio-emitting structures and their interactions with the hot interstellar medium (ISM). This paper details our interpretation of the remarkable X-ray enhancement which caps the inner southwest radio lobe, at a radius of about 6 kpc from the galaxy center. The shell of X-ray-emitting gas is hotter than the ambient ISM, and overpressured by a factor of 100. We argue that it is heated compressed material behind the supersonically-advancing bow shock of the radio lobe, the first example of the phenomenon to be clearly detected. The results demonstrate that Cen A is actively re-heating nearby X-ray-emitting gas. The shell’s kinetic energy is $sim 5$ times its thermal energy, and exceeds the thermal energy of the ISM within 15 kpc of the center of the galaxy. As the shell dissipates it will have a major effect on Cen A’s ISM, providing distributed heating. | | Source: | arXiv, astro-ph/0410299 | | Services: | Forum | Review | PDF | Favorites | |
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