VLBA HI absorption observations of the water megamaser galaxy NGC 5793

Details VLBA HI absorption observations of the water megamaser galaxy NGC 5793 VLBA HI absorption observations of the water megamaser galaxy NGC 5793

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...357....7p&link_type=abstract

Astronomy and Astrophysics, v.357, p.7-12 (2000)

Astronomy and Astrophysics

Astrophysics

5

Galaxies: Active, Galaxies: Individual: Ngc 5793, Galaxies: Ism, Radio Lines: Galaxies

Scientific paper

We report parsec-scale resolution observations of neutral hydrogen seen in absorption in the lambda =21 cm line in the H_2O megamaser galaxy NGC 5793 . We find that the total H i column density of 5*E22((T_sp)/(100 K)) cm-2 is divided into three narrow (FWHM <=16 km s-1) and one broad component (FWHM 50 km s-1). The narrow components have H i column densities of ~ 5*E21((T_sp)/(100 K)) cm-2 and there is evidence that they have sizes =~ 15 pc and H i densities of ~ 150((T_sp)/(100 K)) cm-3. The broad absorption component shows a velocity gradient in the same direction as the CO disk observed in this source. We argue that this broad component could be due to a circumnuclear disk or torus. The observed velocity gradient implies that this structure has radius ~ 50-100 pc.

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