Discovery of the most distant double-peaked emitter at z = 1.369

B. Luo, W. N. Brandt, J. D. Silverman, I. V. Strateva, F. E. Bauer, P. Capak, J. Kartaltepe, B. D. Lehmer, V. Mainieri, M. Salvato, G. Szokoly, D. P. Schneider, C. Vignali

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11 Scopus citations


We report the discovery of themost distant double-peaked emitter, CXOECDFS J033115.0-275518, at z = 1.369.A Keck/DEIMOS spectrum shows a clearly double-peaked broad Mgii λ2799 emission line, with FWHM ≈ 11, 000 km s-1 for the line complex. The line profile can be well fitted by an elliptical relativistic Keplerian disk model. This is one of a handful of double-peaked emitters known to be a luminous quasar, with excellent multiwavelength coverage and a high-quality X-ray spectrum. CXOECDFS J033115.0-275518 is a radio-loud quasar with two radio lobes (FR ii morphology) and a radio loudness of f5 GHz/f4400Å ≈ 429. The X-ray spectrum can be modeled by a power law with photon index 1.72 and no intrinsic absorption; the rest-frame 0.5-8.0 keV luminosity is 5.0 ×1044 erg s-1. The spectral energy distribution (SED) of CXOECDFS J033115.0-275518 has a shape typical for radio-loud quasars and double-peaked emitters at lower redshift. The local viscous energy released from the line-emitting region of the accretion disk is probably insufficient to power the observed line flux, and external illumination of the disk appears to be required. The presence of a big blue bump in the SED along with the unexceptional X-ray spectrum suggest that the illumination cannot arise from a radiatively inefficient accretion flow.

Original languageEnglish (US)
Pages (from-to)1227-1232
Number of pages6
JournalAstrophysical Journal
Issue number2
StatePublished - Apr 20 2009

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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