VLBI observations of high-opacity HI gas in NGC 5793

Details VLBI observations of high-opacity HI gas in NGC 5793 VLBI observations of high-opacity HI gas in NGC 5793

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999newar..43..647p&link_type=abstract

New Astronomy Reviews, Volume 43, Issue 8-10, p. 647-650.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We report on observations, with sub-parsec resolution, of neutral hydrogen seen in absorption in the /λ=21 cm line against the nucleus of the active spiral galaxy NGC 5793. The absorption line consists of three components separated in both location as well as velocity. We derive HI column densities of ~2x1022 cm-2 assuming a gas spin temperature of 100 K. For the first time we are able to reliably estimate the HI cloud sizes (/~15 pc) and atomic gas densities (/~200 cm-3). Our results suggest that the HI gas is not associated with the <10 pc region which presumably contains the H2O masers, but it is more distant from the nucleus, and is probably associated with the /r~1 kpc gas seen in CO.

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