Thin disks and HI absorption in the centre of low power radio galaxies

Details Thin disks and HI absorption in the centre of low power radio galaxies Thin disks and HI absorption in the centre of low power radio galaxies

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..171m&link_type=abstract

6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce

Astronomy and Astrophysics

Astronomy

4

Scientific paper

We present preliminary results from a global VLBI experiment which aims to study the pc scale structure of HI absorption in radio galaxies. In particular, we discuss here the case of the radio galaxy NGC 315, where two HI absorption systems are present. The narrow, redshifted absorption is extended on a scale larger than 10 pc and the properties are consistent with those of a cloud at large distance from the nucleus, such as tidal debris. A broad absorption line, close to the system velocity, is also detected, although at a very faint level. We interpret it as part of a thin disk close to the nucleus, likely the inner region of the large, dust disk observed by HST. This result confirms the idea that nuclei of low luminosity (i.e. Fanaroff-Riley type I galaxies) appear basically unobscured, i.e. the standard pc-scale, geometrically thick torus is not present in these objects.

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