A Caltech Library Service

HST Observations of the Luminous IRAS Source FSC10214+4724: A Gravitationally Lensed Infrared Quasar

Eisenhardt, P. R. and Armus, L. and Hogg, D. W. and Soifer, B. T. and Neugebauer, G. and Werner, M. W. (1996) HST Observations of the Luminous IRAS Source FSC10214+4724: A Gravitationally Lensed Infrared Quasar. In: Science with the Hubble Space Telescope -- II: STScI/ST-ECF Workshop: Paris, France, 4-8 December 1995, proceedings. Space Telescope Science Institute , Baltimore, MD, pp. 94-95.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


With a redshift of 2.3, the IRAS source FSC 10214+4724 is apparently one of the most luminous objects known in the Universe. We present an image of FSC10214+4724 at 0.8μm obtained with the Hubble Space Telescope WFPC2 Planetary Camera. The source appears as an unresolved (< 0".06) arc 0".7 long, with significant substructure along its length. The center of curvature of the arc is located near an elliptical galaxy 1".18 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 ~ 100 and the intrinsic source diameter is ~ 0".01(80 pc) at 0.25μm rest wavelength. The bolometric luminosity is probably amplified by a smaller factor ( ~ 30), 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 ~ 0.9 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 ~ 2 x 10^(13) L_⊙, and remains a highly luminous quasar with an extremely large ratio of infrared to optical/ultraviolet luminosity.

Item Type:Book Section
Related URLs:
URLURL TypeDescription Section Section ItemJournal Article
Armus, L.0000-0003-3498-2973
Hogg, D. W.0000-0003-2866-9403
Additional Information:© Space Telescope Science Institute. This research was supported by NASA through a grant awarded by STScl, 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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASANAS 5-26555
Record Number:CaltechAUTHORS:20170213-142055499
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74258
Deposited By: Melissa Ray
Deposited On:14 Feb 2017 20:16
Last Modified:03 Oct 2019 16:36

Repository Staff Only: item control page