Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6462a&link_type=abstract
HST Proposal ID #6462
Other
Hst Proposal Id #6462 Cosmology
Scientific paper
At a redshift of z=0.93, IRAS 15307+3252 is the most luminous object discovered in the IRAS all sky survey. While optical ground-based images show only a single source at the radio position, deep near-infrared observations reveal that IRAS 15307+3252 has one, and possibly two nearby companions within a radius of 2''. These may be galaxies interacting with IRAS 15307+3252. Alternatively, the IRAS 15307+3252 system {in analogy with IRAS 10214+4724} may be gravitationally lensed by a foreground galaxy. We propose to image IRAS 15307+3252 with the WFPC2 to understand the true nature of this ultraluminous infrared source. Using the F450W and F791W filters will allow us to determine the UV-optical colors of the components. If IRAS 15307+3252 is a merger in progress, the HST data will reveal a wealth of detail on the interaction, such as the brightnesses, sizes, and colors of tidal features, and the possible presence of star forming {proto-globular} clusters. On the other hand, if IRAS 15307+3252 is lensed, the HST data will allow us to create a detailed model of the lens and the source. With this model we will be able to estimate the mass and velocity dispersion of the lensing galaxy, as well as the size and true luminosity of the source. In addition, these data will allow us to more accurately estimate the lensing rate among luminous IRAS galaxies, and therefore understand their true redshift distribution.
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