Spectroscopic and morphological evidence that IRAS FSC 10214+4724 is a gravitational lens

Laird M Close, Patrick B. Hall, Charles T. Liu, E. Keith Hege

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We have obtained a 0″.7 FWHM H image of IRAS FSC 10214+4724. This image suggests FSC 10214+4724 is an arc formed by a gravitational lens located 1″.25 to the north. We have also obtained a coarse spectrpscopic continuum of the leasing galaxy. The location and strength of a break in the continuum suggests the 4000 Å break of an early type galaxy at a redshift of 0.42 ± 0.02. A galaxy 23″ south is found to have a very similar redshift of 0.429 ± 0.002. This redshift, coupled with the observed magnitude of the lensing galaxy (H = 18.45 ± 0.15, in a 2″ aperture), implies the lensing galaxy has a very plausible L* luminosity and a velocity dispersion of 210 ± 20 km s-1 (q0 = 0.5, h = 0.5). Such a lens would produce a faint counter-arc image 1″.6 ± 0″.2 north of the main arc. We observe such a counter-arc in our H image, indicating that FSC 10214+4724 is indeed gravitationally lensed. We find that lensing by a z = 0.42, σ ∼ 210 km s-1 galaxy is a viable and probable solution to both the observed morphology and uniquely large (∼1 × 1014 h -2 L⊙) luminosity of FSC 10214+4724. The true (unlensed) nature of FSC 10214+4724 is likely an ultraluminous IR galaxy of ∼3.7 × 1012 h-2 L⊙.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume452
Issue number1 PART 2
StatePublished - Oct 10 1995

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gravitational lenses
Infrared Astronomy Satellite
galaxies
arcs
leasing
counters
luminosity
continuums
apertures
lenses

Keywords

  • Gravitational lensing
  • Infrared: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Spectroscopic and morphological evidence that IRAS FSC 10214+4724 is a gravitational lens. / Close, Laird M; Hall, Patrick B.; Liu, Charles T.; Hege, E. Keith.

In: Astrophysical Journal, Vol. 452, No. 1 PART 2, 10.10.1995.

Research output: Contribution to journalArticle

Close, Laird M ; Hall, Patrick B. ; Liu, Charles T. ; Hege, E. Keith. / Spectroscopic and morphological evidence that IRAS FSC 10214+4724 is a gravitational lens. In: Astrophysical Journal. 1995 ; Vol. 452, No. 1 PART 2.
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