Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...465..733m&link_type=abstract
Astrophysical Journal v.465, p.733
Astronomy and Astrophysics
Astronomy
28
Galaxies: Individual Ngc Number: Ngc 3783, Galaxies: Seyfert, Ultraviolet: Galaxies
Scientific paper
We have discovered variable absorption lines in HST spectra of the Seyfert 1 galaxy NGC 3783. C IV λλ1548.2, 1550.8 absorption is present in an FOS spectrum on 1992 July 27 and a GHRS spectrum on 1994 January 16 at a radial velocity of -450 km s^-1^ relative to the emission-line peak, but there is no evidence for absorption in a GHRS spectrum on 1993 February 5. A GHRS spectrum on 1993 February 21, obtained just 16 days after the spectrum with no detectable C IV absorption, shows strong N V λλ1238.8, 1242.8 absorption lines, also at a radial velocity of -450 km s^-1^. The observations place constraints on the two types of models for absorption-line variability: bulk motion into the line of sight, and variable ionization of gas already in the line of sight.
Carpenter Kenneth G.
Crenshaw Michael D.
Hutchings John B.
Maran Stephen P.
Mushotzky Richard F.
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