Extended X-ray emission from the BL Lac object PKS 0521-365

Details Extended X-ray emission from the BL Lac object PKS 0521-365 Extended X-ray emission from the BL Lac object PKS 0521-365

1998-12-08

arxiv.org/abs/astro-ph/9812148v1

Mon.Not.Roy.Astron.Soc. 305 (1999) 246

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures, to appear in MNRAS

Scientific paper

10.1046/j.1365-8711.1999.02353.x

Models that seek to unify BL Lacs and low-power radio galaxies predict that the two types of object should show similar isotropically emitted X-ray emission. Testing this is usually limited by difficulties in separating strong X-ray emission from a BL Lac nucleus and surrounding low-surface brightness emission. In this paper we report ROSAT HRI observations of the z=0.055 BL Lac object PKS 0521-365. We are able to separate a luminous extended X-ray component from the bright nucleus. Using a new radio map, we show that it is unlikely that the extended emission is due to inverse-Compton scattering of photons from the active nucleus, and instead interpret it as thermal emission from dense, rapidly cooling gas. This is a more extreme environment than is found in typical FRI radio galaxies, and may pose a problem for unified models.

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