The Nearby Damped Lyman-alpha Absorber SBS 1543+593: A Large HI Envelope in a Gas-Rich Galaxy Group

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dc.creatorRosenberg, J. L.
dc.creatorBowen, D. V.
dc.creatorTripp, T. M.
dc.creatorBrinks, E.
dc.date2006-04-10
dc.date.accessioned2026-07-07T11:25:28Z
dc.date.available2026-07-07T11:25:28Z
dc.descriptionWe present a Very Large Array (VLA) HI 21cm map and optical observations of the region around one of the nearest damped Lyman-alpha absorbers 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-alpha absorber. We discuss the HI and optical properties of SBS 1543+593 and its newly identified neighbors. Both SBS 1543+593 and Dwarf 1 have baryonic components that are dominated by neutral gas -- unusual for damped Lyman-alpha absorbers for which only ~5% of the HI cross-section originates in such strongly gas-dominated systems. What remains unknown is whether low mass gas-rich groups are common surrounding gas-rich galaxies in the local universe and whether the low star-formation rate in these systems is indicative of a young system or a stable, slowly evolving system. We discuss these evolutionary scenarios and future prospects for answering these questions.
dc.description11 pages, AJ accepted
dc.identifierhttps://arxiv.org/abs/astro-ph/0604220
dc.identifierhttp://arxiv.org/abs/astro-ph/0604220
dc.identifierAstron.J.132:478-488,2006
dc.identifierdoi:10.1086/505047
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195519
dc.subjectAstrophysics
dc.titleThe Nearby Damped Lyman-alpha Absorber SBS 1543+593: A Large HI Envelope in a Gas-Rich Galaxy Group
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