Hubble Space Telescope Observations of the Seyfert Galaxy NGC 3783: Discovery of Variable C IV Absorption

Abstract

view Abstract Citations (31) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Hubble Space Telescope Observations of the Seyfert Galaxy NGC 3783: Discovery of Variable C IV Absorption Maran, Stephen P. ; Crenshaw, D. Michael ; Mushotzky, Richard F. ; Reichert, Gail A. ; Carpenter, Kenneth G. ; Smith, Andrew M. ; Hutchings, John B. ; Weymann, Ray J. Abstract 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. Publication: The Astrophysical Journal Pub Date: July 1996 DOI: 10.1086/177457 Bibcode: 1996ApJ...465..733M Keywords: GALAXIES: INDIVIDUAL NGC NUMBER: NGC 3783; GALAXIES: SEYFERT; ULTRAVIOLET: GALAXIES full text sources ADS | data products SIMBAD (4) NED (1) MAST (1) ESA (1)