SIMBAD references

2010MNRAS.405.2453M - Mon. Not. R. Astron. Soc., 405, 2453-2470 (2010/July-2)

Very metal-poor galaxies: ionized gas kinematics in nine objects.


Abstract (from CDS):

The study of ionized gas morphology and kinematics in nine extremely metal-deficient (XMD) galaxies with the scanning Fabry-Perot interferometer on the Special Astrophysical Observatory (SAO) 6-m telescope is presented. Some of these very rare objects (with currently known range of O/H of 7.12 < 12 + log(O/H) < 7.65, or) are believed to be the best proxies of `young' low-mass galaxies in the high-redshift Universe. One of the main goals of this study is to look for possible evidence of star formation (SF) activity induced by external perturbations. Recent results from HI mapping of a small subsample of XMD star-forming galaxies provided confident evidence for the important role of interaction-induced SF. Our observations provide complementary or new information that the great majority of the studied XMD dwarfs have strongly disturbed gas morphology and kinematics or the presence of detached components. We approximate the observed velocity fields by simple models of a rotating tilted thin disc, which allows us the robust detection of non-circular gas motions. These data, in turn, indicate the important role of current/recent interactions and mergers in the observed enhanced SF. As a by-product of our observations, we obtained data for two Low Surface Brightness (LSB) dwarf galaxies: Anon J012544+075957 that is a companion of the merger system UGC 993, and SAO 0822+3545 which shows off-centre, asymmetric, low star formation rate star-forming regions, likely induced by the interaction with the companion XMD dwarf HS 0822+3542.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: individual (UGC 772, HS 0122+0743, SBS 0335-052E and W, HS 0822+3542, SDSS J104457.84+035313.2{SDSS J1044+0353}, SBS 1116+517, SBS 1159+545, HS 2236+1344, SAO 0822+3545) - galaxies: interactions - galaxies: kinematics and dynamics - galaxies: starburst

Simbad objects: 16

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