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arxiv: astro-ph/0003320 · v1 · submitted 2000-03-22 · 🌌 astro-ph

HS 0822+3542 - a new nearby extremely metal-poor galaxy

A. Y. Kniazev (1) , S. A. Pustilnik (1) , J. Masegosa (2) , I. Marquez (2) , A. V. Ugryumov (1) , J.-M. Martin (3) , Y. I. Izotov (4) , D. Engels (5)
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N. Brosch (6) U. Hopp (7) S. Merlino (2) V. A. Lipovetsky (1) ((1) Special Astrophysical Observatory of Russian Academy of Sciences; (2) Instituto de Astrofisica de Andalucia Granada Spain; (3) Observatoire de Paris-Meudon France; (4) Main Astronomical Observatory Ukraine; (5) Hamburger Sternwarte Germany; (6) Wise Observatory Tel-Aviv University Israel; (7) Universitatssternwarte Munchen Germany)
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classification 🌌 astro-ph
keywords galaxymassgalaxiesblueextremelyleastabundancebaryon
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We present the results of spectrophotometry and BVR CCD photometry, as well as integrated HI radio measurements of a new blue compact galaxy (BCG) HS 0822+3542 with extremely low oxygen abundance: 12+log(O/H) = 7.35, or 1/36 of solar value. The galaxy is the third most metal-deficient BCG after I Zw 18 and SBS 0335-052. Its very high mass fraction of gas (~95% of all visible mass) and blue colours of underlying nebulosity are also similar to those of SBS 0335-052. This suggests that HS 0822+3542 is one of the nearest and dimmest galaxies experiencing a recently-started first star formation (SF) episode. Its properties imply that for such galaxies there is a linear scaling of the main parameters, at least for the baryon mass range (0.3-20)x10^8 M_sun. The total mass estimate indicates that the galaxy is dynamically dominated by a dark matter (DM) halo, which itself is one of the least massive for galaxies.

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