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

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        901362.pdf (PDF, 416Kb)
        Author
        Hardcastle, M.J.
        Worrall, D.M.
        Birkinshaw, M.
        Attention
        2299/1196
        Abstract
        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.
        Publication date
        1999
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1046/j.1365-8711.1999.02353.x
        Other links
        http://hdl.handle.net/2299/1196
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