Damped Lyman-α absorption from a nearby Low Surface Brightness galaxy1,2
نویسندگان
چکیده
Ground-based & HST images of the nearby galaxy SBS 1543+593 (z = 0.009) show it to be a Low Surface Brightness (LSB) galaxy with a central surface brightness of μB(0) = 23.2 mag arcsec−2 and scale length 0.9 h−1 kpc, values typical for the local LSB galaxy population. The galaxy lies directly in front of the QSO HS 1543+5921 (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 logN(H I) = 20.35, 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. Subject headings: quasars:absorption lines— quasars:individual (HS 1543+5921)— galaxies:individual(SBS 1543+593)—galaxies:structure
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