DISCOVERY OF THE MOST DISTANT DOUBLE-PEAKED EMITTER AT z=1.369

作者：Luo B^*; Brandt W N; Silverman J D; Strateva I V; Bauer F E; Capak P; Kartaltepe J; Lehmer B D; Mainieri V; Salvato M; Szokoly G; Schneider D P; Vignali C

来源：Astrophysical Journal, 2009, 695(2): 1227-1232.

DOI：10.1088/0004-637X/695/2/1227

• accretion, accretion disks
• galaxies: active
• galaxies: nuclei
• line: profiles
• quasars: emission lines

We report the discovery of the most distant double-peaked emitter, CXOECDFS J033115.0-275518, at z = 1.369. A Keck/DEIMOS spectrum shows a clearly double-peaked broad Mg II lambda 2799 emission line, with FWHM approximate to 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 f(5GHz)/f(4400 angstrom) approximate to 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 x 10(44) 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.

• 出版日期2009-4-20