Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4808b&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #48.08; Bulletin of the American Astronomical Society, Vol. 24, p.807
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the first results from our survey designed to search for Mg II and C IV absorption lines in the disks and haloes of low-redshift galaxies, using background QSOs as probes. The survey utilizes the high resolution of the Goddard High Resolution Spectrograph aboard HST. We focus on one sightline in particular, that towards Mrk 205, which passes 3-5 kpc from the intervening galaxy NGC 4319. We detect Mg II and C IV absorption from both local Milky Way halo gas and from NGC 4319. The equivalent width (W_λ) of the local C IV(lambda1548 ) line is weak, W_λ = 159+/-29 m Angstroms , but very similar to the extragalactic absorption, W_λ = 187+/-61 m Angstroms . However, the disparity between the local Mg II absorption and that in NGC 4319 is severe: the lines arising in the Milky way gas are saturated [W_λ (lambda 2796) = 1.08+/-0.02 Angstroms ], are composed of several components (>=\:4) and are flanked by weak high-velocity components at -215, -153, and -118 km s(-1) . In contrast, the absorption by NGC 4319 is weak (W_λ = 234+/-17 m Angstroms ) and can be modelled with a single component. We discuss our estimates of column density and doppler parameters from fitting theoretical absorption line profiles, and contrast this sightline with observations towards SN1992A, also obtained with the GHRS, which unexpectedly shows no Mg II absorption from the host galaxy. We compare our results of low-z absorption with that seen at higher-redshifts, as determined from the extensive low-resolution absorption line surveys and the more recent echelle observations of absorption lines made at resolutions similar to that used with the GHRS.
Blades Chris J.
Bowen David V.
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