Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1901t&link_type=abstract
American Astronomical Society, AAS Meeting #211, #19.01; Bulletin of the American Astronomical Society, Vol. 39, p.770
Astronomy and Astrophysics
Astronomy
Scientific paper
Ultraviolet quasar absorption lines currently provide the only practical means for measuring the properties of low-density gases in low-redshift galaxy halos and the low-z IGM with statistically useful samples. The first- and second-generation spectrographs on the Hubble Space Telescope and the Far Ultraviolet Spectroscopic Explorer have revealed many tantalizing properties of low-z QSO absorption systems, but the order of magnitude improvement in sensitivity provided by the Cosmic Origins Spectrograph (COS) is likely to revolutionize observational studies of low-z absorbers by providing access to significantly larger samples of QSOs and absorption systems. This talk will begin with a brief review of some of the findings of QSO absorber studies carried out with earlier HST spectrographs including results on the missing-baryons problem and the warm-hot intergalactic medium and studies of galaxy-IGM interactions. Some comments on the science motivations for focusing on the low-redshift IGM will be included. These previous results will then be used to illustrate the exciting prospects of "going deep" with COS. Current samples of low-z QSO absorbers are still relatively small and limited by modest signal-to-noise, and comments will be offered on how COS will enable substantially more detailed studies of the roles played by halo and intergalactic gases in galaxy evolution.
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