Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.329..620b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 329, Issue 3, pp. 620-628.
Astronomy and Astrophysics
Astronomy
15
Galaxies: Active, Galaxies: Individual: 3C 293, Radio Continuum: Galaxies
Scientific paper
We have observed broad HI absorption in the radio galaxy 3C 293 using Multi-Element Radio Linked Interferometric Network (MERLIN) at 0.2-arcsec angular resolution and the Giant Meterwavelength Radio Telescope (GMRT) at arcsec resolution. Extensive HI is found in absorption across the centre of this peculiar radio galaxy, allowing a detailed study of the dynamics of the neutral gas on linear scales down to ~160pc. In optical depth position-velocity diagrams across the central few kpc we detect a distinct velocity gradient of 179kms-1arcsec-1 associated with the broad absorption. This is interpreted as a ring of neutral gas rotating around the suspected position of the active galactic nucleus (AGN). The radius of this high velocity gradient ring is found to be >0.74arcsec (600pc), implying an upper limit upon the enclosed mass of 3.9×109(sin-2i)Msolar, assuming a near edge-on disc with an inclination of i. The optical depth of HI is mapped across the entire central region of 3C 293 showing enhancements of a factor of 4 in the areas that are co-spatial with dust lanes seen in Hubble Space Telescope (HST) imaging of this galaxy.
Beswick Rob J.
Holloway A. J.
Pedlar Alan
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