On The Nature of Extragalactic Star Formation: Neutral Hydrogen Observations of "H-Alpha Dots"

Details On The Nature of Extragalactic Star Formation: Neutral Hydrogen Observations of "H-Alpha Dots" On The Nature of Extragalactic Star Formation: Neutral Hydrogen Observations of "H-Alpha Dots"

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545716a&link_type=abstract

American Astronomical Society, AAS Meeting #215, #457.16; Bulletin of the American Astronomical Society, Vol. 42, p.482

Astronomy and Astrophysics

Astronomy

Scientific paper

We present preliminary results from a major VLA HI imaging program to discern the nature of "Hα Dots". These compact sources of line emission were discovered in a narrow-band imaging study of nearby, star-forming galaxies (Kellar, 2008); while located in close angular and velocity proximity to the target galaxies, they are not obviously associated with them. Here we present C-array imaging of selected members of our sample, with the aim of determining whether the Hα Dots are located within the target galaxies’ gas envelopes, within tidal tails, or if they are isolated, extragalactic star-forming objects. Many of the "Hα Dots" are not detected in HI at this sensitivity level. In the majority of fields with HI-detected Hα Dots, there is clear evidence of tidal stripping from the target galaxy (though some Hα Dots are detected in HI that is not tidally disturbed). Further observations of the sample with the VLA in the D configuration will increase our sensitivity to the extended structures surrounding the target galaxies.

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