Ekta, B. ; Chengalur, Jayaram N. (2010) H I in isolated extremely metal-deficient galaxies Monthly Notices of the Royal Astronomical Society, 403 (1). pp. 295-299. ISSN 0035-8711
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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1365-...
Related URL: http://dx.doi.org/10.1111/j.1365-2966.2009.16108.x
Abstract
We present Giant Metrewave Radio Telescope H I observations of two extremely metal-deficient (XMD) galaxies, UM 133 and SDSS J011914.27-093546.4, with no known nearby companions. Earlier H I observations of XMD galaxies have shown that disturbed H I morphologies and kinematics, generally related to tidal interaction with a companion, are common in them. However, some of these galaxies were already known to be in pairs before the H I observations. The two galaxies studied here were specifically selected because they do not have any known nearby companions. None the less, we find that both the galaxies have highly disturbed H I morphologies and velocity fields. These could have arisen from interactions with more distant companions than considered in our isolation criteria or merger with extremely gas-rich dwarf companions. It is also possible that distorted H I distributions of these XMD galaxies are the result of cold gas accretion from the intergalactic medium. Our observations provide further support to the idea that inflow of metal-poor gas from the outskirts of a galaxy to the central star-forming regions (in the case of interaction), or cold gas accretion is the probable cause for the observed low emission-line metallicities of XMD galaxies.
Item Type: | Article |
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Source: | Copyright of this article belongs to John Wiley and Sons. |
Keywords: | Galaxies: Dwarf; Galaxies: Evolution; Galaxies: Individual: UM 133; Galaxies: Individual: SDSS J011914.27-093546.4; Radio Lines: Galaxies |
ID Code: | 63582 |
Deposited On: | 29 Sep 2011 04:11 |
Last Modified: | 29 Sep 2011 04:11 |
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