HST/COS Spectra of Three QSOs that Probe the Extended Gaseous Halo of a Single Galaxy

Details HST/COS Spectra of Three QSOs that Probe the Extended Gaseous Halo of a Single Galaxy HST/COS Spectra of Three QSOs that Probe the Extended Gaseous Halo of a Single Galaxy

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734512k&link_type=abstract

American Astronomical Society, AAS Meeting #217, #345.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present moderate-resolution Cosmic Origins Spectrograph (COS) far-UV spectra of three QSOs that probe the extended gaseous halo of the nearby spiral galaxy ESO 157-G049 (cz = 1673 km/s; L = 0.1 L*) at impact parameters of 53, 66, and 124 kpc. H I Lyman-alpha absorption is detected at the galaxy redshift in the spectra of all three QSOs and metal lines of Si III, Si IV, and C IV are detected in two of the three spectra. No metals are detected in the sight line that probes ESO 157-G049 along its minor axis at an impact parameter of 124 kpc, implying that there is no galactic wind that reaches these radii. Further, no low ions (i.e., C II, Si II) associated with ESO 157-G049 are detected in any of the QSO spectra so its gaseous halo is highly ionized even at radii of 50 kpc. These spectra allow us to probe the three-dimensional structure of low- and intermediate-ionization gas in nearby galaxy halos for the first time and begin to map the distribution of metals and energy as a function of impact parameter and position angle with respect to the galaxy.

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