Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5937t&link_type=abstract
HST Proposal ID #5937
Other
Hst Proposal Id #5937 Quasars
Scientific paper
Q2237+0305, aka Huchra's lens or Einstein's cross, is one of the best understood gravitational lens systems, in part because the lensing galaxy is unusually nearby (z=0.04). The continuum emitting core of the z=1.69 quasar which is the background source lies only about 0.1 arcsec from perfect alignment directly behind the galaxy, and its images (which fall about 1 arcsec from the center of the galaxy) are magnified by factors at least of order 10. Any emission in the region near the quasar core will also be strongly magnified. Such emission would be resolved from the core images by HST even if it were as small as 50h^-1 parsec (0.01 arcsec intrinsic angular size). We propose to obtain deep WFPC2 images in the F336W and F300W bands which are fortuitously well matched to the redshifted Ly-Alpha emission line of the source. Such emission can be mapped back into the source plane (via available models of the system) to provide a map of the HII region surrounding the quasar at otherwise inaccessible resolution. In addition, Ly-Alpha emission regions in the quasar's host galaxy may be detected with some degree of lensing boost (depending on its location relative to the quasar core), probably with characteristic distorted arc- like shapes. Reversing the problem, resolved emission will also provide additional, potentially powerful constraints on lens models of Q2237+0305 and thus further constrain the galaxy's mass distribution.
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