| Type |
Conference Paper |
| Names |
Brian A. Keeney, J. T. Stocke, J. L. Rosenberg, C. W. Danforth, J. M. Shull, B. D. Savage, J. C. Green |
| Proceedings Title |
Bulletin of the American Astronomical Society |
| Conference Name |
American Astronomical Society, AAS Meeting #217, #345.12 |
| Volume |
43 |
| Date |
January 1, 2011 |
| URL |
http://adsabs.harvard.edu/abs/2011AAS...21734512K |
| Library Catalog |
NASA ADS |
| Abstract |
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. |