Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.301..782c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 301, Issue 3, pp. 782-786.
Astronomy and Astrophysics
Astronomy
13
Galaxies: Active, Galaxies: Individual: Ngc 5929, Galaxies: Ism, Galaxies: Seyfert, Radio Lines: Galaxies
Scientific paper
We present 0.15-arcsec (25-pc) resolution MERLIN observations of neutral hydrogen absorption detected towards the nuclear region of the type 2 Seyfert galaxy NGC 5929. Absorption is detected only towards the north-eastern radio component with a column density of (6.5+/-0.6)x10^21cm^-2. Based on comparison with an HST WFPC2 continuum image, we propose that the absorption is caused by a 1.5-arcsec structure of neutral gas and dust offset 0.3 arcsec south-east of the nucleus and running NE-SW. A separate cloud of dust is apparent 1.5 arcsec to the south-west of the nucleus in the HST image. A comparison of the centroid velocity (2358+/-5kms^-1) and full width at half-maximum (43+/-6kms^-1) of the absorbing gas with previous [OIII] observations suggests that both the neutral and ionized gas are undergoing galactic rotation towards the observer in the north-east and away from the observer in the south-west. The main structure is consistent with an inclined ring of gas and dust encircling the active galactic nucleus (AGN); alternatively it may be a bar or inner spiral arm. We do not detect neutral hydrogen absorption or dust obscuration against the radio nucleus (column density <3.1x10^21cm^-2) expected by a torus of neutral gas and dust in unified models of AGNs for a type 2 Seyfert galaxy.
Cole H. J. G.
Gallimore Jack F.
Holloway A. J.
Mundell Carole G.
Pedlar Alan
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