Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2505b&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #25.05; Bulletin of the American Astronomical Society, Vol. 27, p.848
Astronomy and Astrophysics
Astronomy
Scientific paper
We discuss current result from HST regarding the nature of absorbing halos around nearby galaxies. We summarise the conclusions from a survey designed to search for weak Mg II absorption from present-epoch galaxies using the GHRS. The data show that galaxies do not possess extended Mg II cross-sections beyond radii of 50 h(-1) kpc to a column density limit of <=\:4times 10(12) cm(-2) . The covering factor of gas at radii <\:10 h(-1) kpc (and within an optical radius) is high, but the characteristics of the absorption --- the strength and complexity of a line, and the ionization state of the absorbing gas --- depend on the galaxy's environment. There is also evidence that early-type galaxies may not possess the same cross-sections as late-type galaxies. We present new FOS spectra of QSOs whose sightlines pass through the outer regions of two bright spiral galaxies, beyond the stellar radius of the galaxy but below the radius of Mg II halos found at z\: ~ \:0.5, to study C IV, Mg II and Lyalpha absorption. We also show the far UV spectra of 3C 232, which was the first QSO-galaxy pair studied using ground-based observatories. We conclude by considering the extent of Lyalpha absorbing halos around nearby galaxies, and how these results compare with higher redshift studies.
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