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- W2963733941 abstract "We describe results of a multi-spectral study of a blue compact dwarf galaxy in the Virgo Cluster. The object was observed with broad-band and H imaging, ultraviolet ob- servations, and radio synthesis. Our data were combined with previously published optical observations, with HI single-beam observation and with far-infrared data, and were compared to results of evolutionary synthesis programs. The radio synthesis observationsrevealedacompactconcentrationofHIcoincident with the optical galaxy, embedded in a diffuse, asymmetric HI cloud which has no trace of optical emission. While the overall velocity dispersion and size of the HI structure suggests that the totalmassinstarsandgasisnotsufcienttogravitationallybind the system as a whole, the HI clump coincident with the optical galaxy requires little or no dark matter to be self-gravitating. The diffuse cloud has more complex velocity structure and is extended in a direction approximately perpendicular to the op- tical major axis. Theoptical-UVdatacanbeexplainedbyasinglepopulation of stars formed in a recent burst, indicating that this is a genuine young galaxy. The efciency of star formation is similar to that inlargediskgalaxies.TheIRemissionindicatesthepresenceof dust; this must have been formed very recently, or was already present within the original HI cloud from which the galaxy was formed.Theroundandsmoothisophotes,thecorrespondenceof the optical and HI redshifts, and the lack of any suitable nearby galaxy, indicate that the starburst was probably not triggered by an external interaction with a visible galaxy. The distribution of HI ts better a blow-out scenario than an accretion or collision with a companion. We point out features in common with other actively star-forming dwarf galaxies and conclude that, at least in the southern outskirts of the Virgo cluster, intensive star for- mation, perhaps for the rst time in some objects, takes place at present." @default.
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- W2963733941 date "1998-03-01" @default.
- W2963733941 modified "2023-09-25" @default.
- W2963733941 title "VCC 144: a star-bursting dwarf galaxy in the Virgo cluster ?" @default.
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