Discovery of an Extremely Metal-Poor Galaxy: Optical Spectroscopy of UGCA 292 | Zendy

Liese van Zee | Zendy

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Discovery of an Extremely Metal-Poor Galaxy: Optical Spectroscopy of UGCA 292

Author(s) -

Liese van Zee

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/318176

Subject(s) - astrophysics , physics , metallicity , galaxy , dwarf galaxy , irregular galaxy , spectroscopy , abundance (ecology) , galaxy group , astronomy , elliptical galaxy , interacting galaxy , biology , fishery

The results of optical spectroscopy of two HII regions in UGCA 292 (CVn IdwA) are presented. UGCA 292 is a nearby (D=3.1 Mpc) gas-rich dwarf irregulargalaxy (M_H/L_B ~ 6.9) which was first discovered in a blind HI survey. Thederived oxygen abundance is the third lowest of known star-forming galaxies [12+ log(O/H) = 7.30 +/- 0.05], making UGCA 292 one of the nearest metal-poorgalaxies known. The derived N/O ratio is similar to that found in other lowmetallicity galaxies [log(N/O) = -1.47 +/- 0.10], and is indicative of aprimary origin for nitrogen. The derived oxygen abundance is consistent withclosed-box chemical evolution for this low mass galaxy. The observed bluecolors, high gas mass fraction, and low metallicity suggest that UGCA 292 isrelatively unevolved. The possibility that future blind HI surveys may yieldsimilar low metallicity galaxies is discussed.Comment: 4 pages, 2 figures, uses emulateapj5, accepted by ApJ

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