The Physical Nature of the z 0.274 Lyman-Limit System toward PKS1630-377

Details The Physical Nature of the z 0.274 Lyman-Limit System toward PKS1630-377 The Physical Nature of the z 0.274 Lyman-Limit System toward PKS1630-377

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734509r&link_type=abstract

American Astronomical Society, AAS Meeting #217, #345.09; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The absorption features seen in the spectra of quasi-stellar objects (QSOs) provide a unique opportunity to probe the galactic and intergalactic regions which intersect the lines of sight (LOS). Understanding the environment of these absorbers allows us to make a connection with physical structures and study the properties and evolution of galaxies, the intergalactic medium (IGM), and the galaxy-IGM interface. We examine a Lyman-limit system (LLS) at z 0.274 along the LOS of the QSO PG1630+377(zem=1.478), using new, high signal to noise data from the Cosmic Origins Spectrograph. The LLS shows strong O VI and C III absorption, but is lacking evidence of low-ion absorption, indicating the absorber is substantially ionized. This result contrasts observations of similar absorption systems such as PKS0405-123 and PKS0312-77, which show clear low-ion absorption. We also investigate the galactic environment surrounding the absorber to identify potential host galaxies using images from the Large Binocular Telescope and spectroscopic redshifts from Keck. We find two galaxies at z 0.275, indicating the absorber is tracing material physically associated with extended galactic regions.
Support for program number HST-GO-11741 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.

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