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20 April 2024 |
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HS 0822+3542 - a new nearby extremely metal-poor galaxy | | Kniazev A.Y.
; Pustilnik S.A.
; Masegosa J.
; Marquez I.
; Ugryumov A.V.
; Martin J.-M.
; Izotov Y.I.
; Engels D.
; Brosch N.
; Hopp U.
; Merlino S.
; Lipovetsky V.A.
; | | Date: |
22 Mar 2000 | | Subject: | astro-ph | | Affiliation: | Special Astrophysical Observatory of Russian Academy of Sciences; Instituto de Astrofisica de Andalucia, Granada, Spain; Observatoire de Paris-Meudon, France; Main Astronomical Observatory, Ukraine; Hamburger Sternwarte, Germany; Wise Observator | | Abstract: | 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. | | Source: | arXiv, astro-ph/0003320 | | Services: | Forum | Review | PDF | Favorites | |
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