Other
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.2386h&link_type=abstract
ATNF proposal C2060, Semester: July, 2009
Other
Extragalactic, Atca
Scientific paper
Overlapping pairs of galaxies can be used to find the foreground galaxy's transparency and hence dust content. We have found in a Hubble image, a small low-inclination spiral backlit by the bright bulge of a larger, more distant, spiral galaxy. The foreground galaxy is ringed by dark, dusty structures, extending well outside the stellar disk. We ask for ATCA HI observations of this pair to confirm a marginal HIPASS detection of the foreground objects and to determine the foreground galaxy's distance, HI mass and total dynamical mass. The distance and HI line profile will confirm our premise that this is not a merging or interacting pair. The mass measurements --HI and dynamical-- will place this galaxy in the context of other spirals: it may be that this is a unique disk which just happens to be backlit by another galaxy but if its HI and mass-to-light ratio are typical, it points to an ubiquity of extended dusty ISM disks in spiral galaxies.
Allen Ronald
Blyth Sarah-Louise
Bouchard Antoine
de Blok Erwin
der Heyden Kurt van
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