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

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dc.creatorKniazev, A. Y.
dc.creatorPustilnik, S. A.
dc.creatorMasegosa, J.
dc.creatorMarquez, I.
dc.creatorUgryumov, A. V.
dc.creatorMartin, J. -M.
dc.creatorIzotov, Y. I.
dc.creatorEngels, D.
dc.creatorBrosch, N.
dc.creatorHopp, U.
dc.creatorMerlino, S.
dc.creatorLipovetsky, V. A.
dc.date2000-03-22
dc.date.accessioned2026-07-07T06:30:48Z
dc.date.available2026-07-07T06:30:48Z
dc.descriptionWe 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.
dc.description11 pages, 6 figures, uses psfig.sty, Accepted for publication in Astronomy & Astrophysics, main journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0003320
dc.identifierhttp://arxiv.org/abs/astro-ph/0003320
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/98431
dc.subjectAstrophysics
dc.titleHS 0822+3542 - a new nearby extremely metal-poor galaxy
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