cm H I emission from the Damped Lyman - α absorber SBS 1543 + 593
نویسندگان
چکیده
We detect 21-cm emission from the Low Surface Brightness (LSB) galaxy SBS 1543+593, which gives rise to a Damped-Lyα (DLyα) absorption line in the spectrum of the background QSO HS 1543+5921 (ze = 0.807). We obtain an accurate measure of the velocity of the H I gas in the LSB galaxy, v = 2868 km s, and derive a mass of MH I = 1.3× 10 9 M⊙. We compare MH I with limits obtained towards two other z ∼ 0.1 DLyα systems, and show that SBS 1543+593 would not have been detected. Hence LSB galaxies similar to SBS 1543+593 can be responsible for DLyα systems at even modest redshifts without being detectable from their 21-cm emission.
منابع مشابه
The Nearby Damped Lyman-α Absorber Sbs 1543+593: a Large H I Envelope in a Gas-rich Galaxy Group
We present a Very Large Array (VLA) H I 21cm map and optical observations of the region around one of the nearest damped Lyman-α absorber beyond the local group, SBS 1543+593. Two previously uncataloged galaxies have been discovered and a redshift has been determined for a third. All three of these galaxies are at the redshift of SBS 1543+593 and are < ∼185 kpc from the damped Lyman-α absorber....
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