Near-Infrared Observations of the Environments of Radio-quiet QSOs at z >~ 1
Abstract
We present the results of an infrared survey of QSO fields at z=0.95, 0.995, and 1.5. Each z<1 field was imaged to typical continuum limits of J=20.5, K'=19 (5 σ) and line fluxes of 1.3×10-16 ergs cm-2 s-1 (1 σ) in a 1% interference filter. Sixteen fields were chosen with z~0.95 targets, 14 with z~0.995, and six with z~1.5. A total area of 0.05 deg2 was surveyed, and two emission-line objects were found. We present the infrared and optical photometry of these objects. Optical spectroscopy has confirmed the redshift of one object (at z=0.989) and is consistent with the other object having a similar redshift. We discuss the density of such objects across a range of redshifts from this survey and others in the literature. We also present number-magnitude counts for galaxies in the fields of radio quiet QSOs, supporting the interpretation that they exist in lower density environments than their radio-loud counterparts. The J-band number counts are among the first to be published in the J=16-20 range.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 1999
- DOI:
- 10.1086/307480
- arXiv:
- arXiv:astro-ph/9902231
- Bibcode:
- 1999ApJ...520..469T
- Keywords:
-
- GALAXIES: SEYFERT;
- INFRARED: GALAXIES;
- GALAXIES: QUASARS: GENERAL;
- RADIO CONTINUUM: GALAXIES;
- Galaxies: Seyfert;
- Infrared: Galaxies;
- Galaxies: Quasars: General;
- Radio Continuum: Galaxies;
- Astrophysics
- E-Print:
- 34 pages, including 12 figures