Damped Lyman-alpha absorption from a nearby Low Surface Brightness Galaxy

Details Damped Lyman-alpha absorption from a nearby Low Surface Brightness Galaxy Damped Lyman-alpha absorption from a nearby Low Surface Brightness Galaxy

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.0311b&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #03.11; Bulletin of the American Astronomical Society, Vol. 32, p.1387

Astronomy and Astrophysics

Astronomy

Scientific paper

Ground-based & HST imaging of the nearby galaxy SBS 1543+593 (z=0.009) shows that the galaxy is actually a Low Surface Brightness (LSB) galaxy with a central surface brightness of μ B(0) = 23.2 mag arcsec-2 and scale height 0.9 h-1 kpc, values typical for the local LSB galaxy population. The galaxy lies directly in front of the QSO HS 1543+593 (z=0.807); an HST STIS spectrum of the quasar reveals a damped Lyα (DLyα ) line at the redshift of the interloper with an H I column density of log N(H I) = 20.47, as well as several low-ionization metal lines with strengths similar to those found in the Milky Way interstellar medium. Our data show that LSB galaxies are certainly able to produce the DLyα lines seen at higher redshift, and fuels the speculation that LSB galaxies are a major contributor to that population of absorbers.

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