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Peter R. Eisenhardt
MS 169-327, Jet Propulsion Laboratory,
California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109
Lee Armus, David W. Hogg, B. T. Soifer, G. Neugebauer
Division of Physics, Math, & Astronomy,
California Institute of Technology, Pasadena, CA 91125
Michael W. Werner
MS 169-327, Jet Propulsion Laboratory,
California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109
m obtained with the Hubble Space
Telescope WFPC2 Planetary Camera. The source appears as an unresolved
(
) arc 
long, with significant substructure along
its length. The center of curvature of the arc is located near an
elliptical galaxy 
to the north. An unresolved component 100
times fainter than the arc is clearly detected on the opposite side of
this galaxy. The most straightforward interpretation is that FSC
10214+4724 is gravitationally lensed by the foreground elliptical
galaxy, with the faint component a counterimage of the IRAS source.
The brightness of the arc in the HST image is then magnified by
and the intrinsic source diameter is 
pc)
at 
m rest wavelength. The bolometric luminosity is probably
amplified by a smaller factor (
), due to the larger extent
expected for the source in the far-infrared. A detailed lensing model
is presented which reproduces the observed morphology and relative flux
of the arc and counterimage, and correctly predicts the position angle
of the lensing galaxy. The model also predicts reasonable values for
the velocity dispersion, mass, and mass-to-light ratio of the lensing
galaxy for a wide range of galaxy redshifts. A redshift for the
lensing galaxy of 
is consistent with the measured surface
brightness profile from the image, as well as with the galaxy's
spectral energy distribution. The background lensed source has an
intrinsic luminosity 
, and remains a
highly luminous quasar with an extremely large ratio of infrared to
optical/ultraviolet luminosity.
This work is fully described in Eisenhardt et al. (1996), Ap.J. Vol. 461, in press.
This research was supported by NASA through a grant awarded by STScI, which is operated by AURA, Inc. under NASA contract NAS5-26555. Portions of the research described in this paper were carried out by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA.
Figure: Lucy-Richardson deconvolution of WFPC2 Planetary Camera F814W
image of IRAS FSC10214+4724. The field of view is approximately 10
arcseconds, and north is rotated 37 degrees counterclockwise from vertical,
with east 90 degrees counterclockwise from north.