SDSS 0809+1729: Connections Between Extremely Metal Poor Galaxies and Gamma Ray Burst Hosts

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dc.creatorKewley, Lisa J.
dc.creatorBrown, Warren R.
dc.creatorGeller, Margaret J.
dc.creatorKenyon, Scott J.
dc.creatorKurtz, Michael J.
dc.date2006-09-11
dc.date.accessioned2026-07-07T11:26:00Z
dc.date.available2026-07-07T11:26:00Z
dc.descriptionWe discuss the serendipitous discovery of an extremely metal poor galaxy, SDSS 0809+1729, classified as a star in the Sloan Digital Sky Survey (SDSS). The galaxy has a redshift z = 0.0441 and a B-band absolute magnitude M_B = -17.1. With a metallicity of log(O/H)+12~7.44 or ~1/20 solar, this galaxy is among the 10 most metal poor emission-line galaxies known. SDSS 0809+1729 is a blue compact galaxy (BCG) with a stellar age of ~4.5 Myr, a star formation rate of 0.18 Msun/yr, and a large gas-phase electron density ~367/cm^3. Similar values of these parameters are common among other extremely metal poor galaxies, including IZw18. SDSS 0809+1729 is, however, unusual among BCGs because it lies in the same region of the luminosity-metallicity diagram as the two lowest metallicity long duration gamma ray burst (GRB) hosts. For a given B-band luminosity, both nearby GRB hosts and SDSS 0809+1729 have systematically lower metallicities than dwarf irregulars, the majority of BCGs, and normal star-forming galaxies. Because the star formation properties of SDSS 0809+1729 are similar to nearby long duration GRB hosts, SDSS 0809+1729 may be a potential GRB host. Identification of larger samples of similar extremely metal poor objects may provide important insights into the conditions required to produce long duration GRBs.
dc.description12 pages, 3 figures, 3 tables. To be published in the Astronomical Journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0609246
dc.identifierhttp://arxiv.org/abs/astro-ph/0609246
dc.identifierAstron.J.133:882-888,2007
dc.identifierdoi:10.1086/509135
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195687
dc.subjectAstrophysics
dc.titleSDSS 0809+1729: Connections Between Extremely Metal Poor Galaxies and Gamma Ray Burst Hosts
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