Discovery of a Radio-loud/Radio-quiet Binary Quasar
Open Access
- 1 April 1999
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 514 (2), L61-L64
- https://doi.org/10.1086/311956
Abstract
We report the discovery of a small-separation quasar pair (z=0.586, O=18.4, 19.2, and a separation of 23) associated with the radio source FIRST J164311.3+315618 (S1400=120 mJy). The spectrum of the brighter quasar (A) has a much stronger narrow emission line spectrum than the other (B), and it also has stronger Balmer lines relative to the continuum. The continuum ratio of the spectra is flat in the blue (λobsK' image shows two unresolved sources with a flux ratio of 1.3. The different colors appear to result from the contribution of the host galaxy of B, which is evident from Ca II and high-order Balmer absorption lines that are indicative of a substantial young stellar population. New 3.6 cm VLA observations show that the compact radio source is coincident with quasar A (B is only marginally detected). We rule out the lensing hypothesis because the optical flux ratio is A/B≈1.5-2, while the radio flux ratio is A/B40, and conclude that this system is a binary. Moreover, the radio-loud quasar is a compact, steep spectrum source. FIRST J164311.3+315618A, B is the lowest redshift and smallest separation binary quasar yet identified.Keywords
This publication has 22 references indexed in Scilit:
- Near‐Infrared Imaging of Gigahertz Peaked Spectrum, Compact Steep Spectrum, and Large‐Scale FR II Radio GalaxiesThe Astrophysical Journal, 1998
- The NRAO VLA Sky SurveyThe Astronomical Journal, 1998
- Percursos piagetianosEducação & Sociedade, 1998
- Unification of the Radio and Optical Properties of Gigahertz Peak Spectrum and Compact Steep‐Spectrum Radio SourcesThe Astrophysical Journal, 1997
- The Texas Survey of Radio Sources Covering -35.5 degrees < declination < 71.5 degrees at 365 MHzThe Astronomical Journal, 1996
- NLR Kinematics in CSS Radio SourcesSymposium - International Astronomical Union, 1996
- The FIRST Survey: Faint Images of the Radio Sky at Twenty CentimetersThe Astrophysical Journal, 1995
- H I in the GalaxyAnnual Review of Astronomy and Astrophysics, 1990
- 1343.4+2640 - A close quasar pairThe Astrophysical Journal, 1988
- Discovery of a probable binary quasarThe Astrophysical Journal, 1987