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Journal article
HIGH-REDSHIFT SDSS QUASARS WITH WEAK EMISSION LINES
The Astrophysical journal, v 699(1), pp 782-799
01 Jul 2009
Abstract
We identify a sample of 74 high-redshift quasars (z > 3) with weak emission lines from the Fifth Data Release of the Sloan Digital Sky Survey and present infrared, optical, and radio observations of a subsample of four objects at z > 4. These weak emission-line quasars (WLQs) constitute a prominent tail of the Ly alpha + N v equivalent width distribution, and we compare them to quasars with more typical emission-line properties and to low-redshift active galactic nuclei with weak/absent emission lines, namely BL Lac objects. We find that WLQs exhibit hot (T similar to 1000 K) thermal dust emission and have rest-frame 0.1-5 mu m spectral energy distributions that are quite similar to those of normal quasars. The variability, polarization, and radio properties of WLQs are also different from those of BL Lacs, making continuum boosting by a relativistic jet an unlikely physical interpretation. The most probable scenario for WLQs involves broad-line region properties that are physically distinct from those of normal quasars.
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Details
- Title
- HIGH-REDSHIFT SDSS QUASARS WITH WEAK EMISSION LINES
- Creators
- Aleksandar M. Diamond-Stanic - University of ArizonaXiaohui Fan - Max Planck Institute for AstronomyW. N. Brandt - Pennsylvania State UniversityOhad Shemmer - Pennsylvania State UniversityMichael A. Strauss - Princeton UniversityScott F. Anderson - University of WashingtonChristopher L. Carilli - Natl Radio Astron Observ, Socorro, NM 87801 USARobert R. Gibson - Pennsylvania State UniversityLinhua Jiang - University of ArizonaJ. Serena Kim - Univ Arizona, Steward Observ, Tucson, AZ 85721 USAGordon T. Richards - Drexel UniversityGary D. Schmidt - University of ArizonaDonald P. Schneider - Pennsylvania State UniversityYue Shen - Princeton UniversityPaul S. Smith - University of ArizonaMarianne Vestergaard - Tufts UniversityJason E. Young - Pennsylvania State University
- Publication Details
- The Astrophysical journal, v 699(1), pp 782-799
- Publisher
- Iop Publishing Ltd
- Number of pages
- 18
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000267056300059
- Scopus ID
- 2-s2.0-68049144429
- Other Identifier
- 991019169696904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics