Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.2603q&link_type=abstract
American Astronomical Society, AAS Meeting #212, #26.03; Bulletin of the American Astronomical Society, Vol. 40, p.534
Other
3
Scientific paper
A search for emission lines in foreground galaxies, in QSO spectra (zgal << zQSO) of the Sloan Digital Sky Survey (SDSS) data release 5 (DR5), reveals 21 examples of QSOs shining through low redshift, foreground galaxies at low impact parameters (<10; kpc). About 74,000 QSO spectra were examined, by searching for narrow Hα emission lines at z<0.295, at a flux level greater than 5 x 10-17 ergs/cm2-sec, then confirming that other expected emission lines of the H II regions in the galaxy are detected. The measurements show that the galaxies have abundances of solar or above and star formation rates between 10 and 1000 solar masses per year. The galaxies were deblended from the QSOs to get colors and shapes. For cases that allow the galaxy and the QSO to be deblended, the galaxies are blue [1.0<(u-r)<1.9]. Extinction through the galaxies is determined from the color excesses of the QSOs. The color excesses are from 0 to 0.25 magnitudes. These extinction values are compared with the flux ratios of Hα and Hβ, which reflect the extinction for an undetermined fraction of the sightline through each galaxy. Measurement or limits on galactic, interstellar Ca II and Na I absorption are given, from the QSO spectrum. The technique used is compared with other ways of finding QSO/galaxy pairs, for the purpose of designing an experiment to characterize the absorption properties of gas in galaxies at distances from the galaxy centers < 10 kpc.
Bishof Michael
Bowen David
Hall Peter
Heckman Tim
Khare Pushpa
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