The ultraviolet-to-mid-infrared spectral energy distribution of weak emission line quasars

Ryan A. Lane, Ohad Shemmer, Aleksandar M. Diamond-Stanic, Xiaohui Fan, Scott F. Anderson, W. N. Brandt, Richard M. Plotkin, Gordon T. Richards, Donald P. Schneider, Michael A. Strauss

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We present Spitzer Space Telescope photometry of 18 Sloan Digital Sky Survey (SDSS) quasars at 2.7 ≤ z ≤ 5.9 which have weak or undetectable high-ionization emission lines in their rest-frame ultraviolet (UV) spectra (hereafter weak-lined quasars, or WLQs). The Spitzer data are combined with SDSS spectra and ground-based, near-infrared (IR) photometry of these sources to produce a large inventory of spectral energy distributions (SEDs) of WLQs across the rest-frame 0.1-5 μm spectral band. The SEDs of our sources are inconsistent with those of BL Lacertae objects which are dominated by synchrotron emission due to a jetaligned close to our line of sight, but are consistent with the SED of ordinary quasars with similar luminosities and redshifts that exhibit a near-to-mid-IR "bump," characteristic of hot dust emission. This indicates that broad emission lines in WLQs are intrinsically weak, rather than suffering continuum dilution from a jet, and that such sources cannot be selected efficiently from traditional photometric surveys.

Original languageEnglish (US)
Article number163
JournalAstrophysical Journal
Volume743
Issue number2
DOIs
StatePublished - Dec 20 2011

Fingerprint

spectral energy distribution
quasars
energy
BL Lacertae objects
infrared photometry
Space Infrared Telescope Facility
ultraviolet spectra
spectral bands
line of sight
photometry
dilution
near infrared
synchrotrons
ionization
dust
luminosity
continuums
distribution

Keywords

  • galaxies: active
  • galaxies: nuclei
  • infrared: galaxies
  • quasars: emission lines
  • quasars: general

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Lane, R. A., Shemmer, O., Diamond-Stanic, A. M., Fan, X., Anderson, S. F., Brandt, W. N., ... Strauss, M. A. (2011). The ultraviolet-to-mid-infrared spectral energy distribution of weak emission line quasars. Astrophysical Journal, 743(2), [163]. https://doi.org/10.1088/0004-637X/743/2/163

The ultraviolet-to-mid-infrared spectral energy distribution of weak emission line quasars. / Lane, Ryan A.; Shemmer, Ohad; Diamond-Stanic, Aleksandar M.; Fan, Xiaohui; Anderson, Scott F.; Brandt, W. N.; Plotkin, Richard M.; Richards, Gordon T.; Schneider, Donald P.; Strauss, Michael A.

In: Astrophysical Journal, Vol. 743, No. 2, 163, 20.12.2011.

Research output: Contribution to journalArticle

Lane, RA, Shemmer, O, Diamond-Stanic, AM, Fan, X, Anderson, SF, Brandt, WN, Plotkin, RM, Richards, GT, Schneider, DP & Strauss, MA 2011, 'The ultraviolet-to-mid-infrared spectral energy distribution of weak emission line quasars', Astrophysical Journal, vol. 743, no. 2, 163. https://doi.org/10.1088/0004-637X/743/2/163
Lane, Ryan A. ; Shemmer, Ohad ; Diamond-Stanic, Aleksandar M. ; Fan, Xiaohui ; Anderson, Scott F. ; Brandt, W. N. ; Plotkin, Richard M. ; Richards, Gordon T. ; Schneider, Donald P. ; Strauss, Michael A. / The ultraviolet-to-mid-infrared spectral energy distribution of weak emission line quasars. In: Astrophysical Journal. 2011 ; Vol. 743, No. 2.
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