Computer Science
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..196s&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Computer Science
2
Scientific paper
NGC 3079 is an edge-on galaxy and its nuclear activity is classified to be a type 2 Seyfert. Neutral hydrogen absorption was detected in the nuclear region of the galaxy. Interferometric observations have shown that neutral hydrogen absorption towards the nucleus has a few velocity components around the systemic velocity of the galaxy, Vsys. Interferometric experiments have also revealed that the velocity structure of neutral hydrogen absorption in the few-hundred-parsec-scale region is dominated by the galactic rotation. In this contribution, we present results of high-resolution VLBI observations at 1.4 GHz of the nuclear region of NGC 3079. We detect a broad (FWHM > 250 km s-1) neutral hydrogen absorption feature near Vsys, seen only in the nucleus. The broad absorption implies a high column density (~1022 atoms cm-2) for the neutoral hydrogen gas, assuming spin temperature of 100 K. The broad width and high column density of the neutoral hydrogen absorption seen on the nucleus suggest fast moving circumnuclear gas.
Inoue Makoto
Kameno Seiji
Migenes Victor
Nakai Noriyuki
Sawada-Satoh Satoko
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