Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.0420b&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #04.20; Bulletin of the American Astronomical Society, Vol. 25, p.793
Other
Scientific paper
We present the results of a search for UV absorption lines in the spectra of quasars and supernovae whose sightlines probe the disks and haloes of low-redshift galaxies. Our survey concentrates on looking for Mg IIlambda lambda 2796,2803 and C IVlambda lambda 1548,1550 resonance absorption lines using the Goddard High Resolution Spectrograph (GHRS) aboard HST. This instrument provides very sensitive limits (30-60 m Angstroms ) for detecting absorption from intervening gas. We have selected seven quasars, SN 1992A, and SN 1993J to probe the interstellar media of many types of galaxies, including a spheroidal dwarf (Leo I), two irregulars (LMC and UGC 1807), an elliptical (NGC 1380), and numerous field and cluster spirals. The separations between QSO sightline and galaxy range from 2-3 kpc to ~ \:100\:h(-1) kpc. Of the data obtained so far, we find Mg II absorption towards Mrk 205, which shines through the disk of NGC 4319, and SN 1993j which exploded in M83 and which was observed at 3 km s(-1) resolution with the GHRS echelle grating. In both cases the separations are small. We fail to find absorption towards any of the other pairs, including some with equally small separations. In contrast, the local Galactic Mg II lines, which are often observed simultaneously are always strong, and contain important velocity information on Milky Way halo gas.
Blades Chris J.
Bowen David V.
Pettini Max
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