Multifrequency analysis of the new wide-separation gravitational lens candidate RX J0921 + 4529

J. A. Muñoz, E. E. Falco, C. S. Kochanek, J. Lehár, B. A. McLeod, B. R. McNamara, A. A. Vikhlinin, C. D. Impey, H. W. Rix, C. R. Keeton, C. Y. Peng, C. R. Mullis

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


We report the discovery of a new two-image gravitational lens candidate. The system RX J0921 + 4529 contains two zs = 1.66 quasars separated by 6″.93 with an H-band magnitude difference of Δm = 1.39. The HST NIC2 H-band images reveal an H = 18.2 spiral galaxy between the quasar images, which is probably a member of a zl = 0.32 X-ray cluster centered on the field. We detect an extended source near the fainter quasar image but not in the brighter image. If this extended source is the host galaxy of the fainter quasar, then the system is a binary quasar rather than a gravitational lens. VLA observations at 3.6 cm reveal emission from the lens galaxy at the flux level of 1 mJy and a marginal detection of the brighter quasar.

Original languageEnglish (US)
Pages (from-to)769-774
Number of pages6
JournalAstrophysical Journal
Issue number2 PART 1
StatePublished - Jan 10 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Gravitational lensing

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