Probing the Nature of High-redshift Weak Emission Line Quasars: A Young Quasar with a Starburst Host Galaxy

被引：32

作者：

Andika, Irham Taufik ^{[1
,2
]}

Jahnke, Knud ^{[1
]}

Onoue, Masafusa ^{[1
]}

Banados, Eduardo ^{[1
]}

Mazzucchelli, Chiara ^{[3
]}

Novak, Mladen ^{[1
]}

Eilers, Anna-Christina ^{[1
,4
]}

Venemans, Bram P. ^{[1
]}

Schindler, Jan-Torge ^{[1
]}

Walter, Fabian ^{[1
]}

Neeleman, Marcel ^{[1
]}

Simcoe, Robert A. ^{[4
]}

Decarli, Roberto ^{[5
]}

Farina, Emanuele Paolo ^{[6
]}

Marian, Victor ^{[1
,2
]}

Pensabene, Antonio ^{[5
,7
]}

Cooper, Thomas M. ^{[8
]}

Rojas, Alejandra F. ^{[9
]}

机构：

[1] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[2] Heidelberg Univ, Int Max Planck Res Sch Astron & Cosm Phys, Heidelberg, Germany

[3] European Southern Observ, Alonso Cordova 3107, Vitacura, Region Metropol, Chile

[4] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[5] INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy

[6] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany

[7] Univ Bologna, Alma Mater Studiorum, Dipartimento Fis & Astron, Via Gobetti 93-2, I-40129 Bologna, Italy

[8] Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA

[9] Univ Antofagasta, Ctr Astron CITEVA, Ave Angamos 601, Antofagasta, Chile

来源：

ASTROPHYSICAL JOURNAL | 2020年 / 903卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局; 欧洲研究理事会;

关键词：

SUPERMASSIVE BLACK-HOLES; LUMINOSITY FUNCTION; Z-SIMILAR-TO-6; QUASARS; ACCRETION RATES; DIRECT COLLAPSE; MASS; EVOLUTION; MODEL; SPECTROSCOPY; REIONIZATION;

D O I：

10.3847/1538-4357/abb9a6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the discovery of PSO J083.8371+11.8482, a weak emission line quasar with extreme star formation rate at z = 6.3401. This quasar was selected from Pan-STARRS1, UHS, and unWISE photometric data. Gemini/GNIRS spectroscopy follow-up indicates a Mg ii-based black hole mass of M-BH = (2.0-(+0.7)(0.4)) x 10(9) M-circle dot and an Eddington ratio of = L-bol/E-dd =0.5(-0.2)(+0.1), in line with an actively accreting supermassive black hole (SMBH) at z greater than or similar to 6. Hubble Space Telescope imaging sets strong constraint on lens boosting, showing no relevant effect on the apparent emission. The quasar is also observed as a pure point source with no additional emission component. The broad-line region (BLR) emission is intrinsically weak and not likely caused by an intervening absorber. We found rest-frame equivalent widths of EW (Mg II)(rest) = 8.7 +/- 0.7 angstrom. A small proximity zone size (R-p = 1.2 +/- 0.4 pMpc) indicates a lifetime of only t(Q) = 10(3.4 +/- 0.7) years from the last quasar phase ignition. ALMA shows extended [C II] emission with a mild velocity gradient. The inferred far-infrared luminosity (L-FIR = 1.2 +/- 0.1) x 10(13) L-circle dot) is one of the highest among all known quasar hosts at z greater than or similar to 6. Dust and [C II] emissions put a constraint on the star formation rate of SFR = 900-4900 M-circle dot yr(-1), similar to that of a hyperluminous infrared galaxy. Considering the observed quasar lifetime and BLR formation timescale, the weak-line profile in the quasar spectrum is most likely caused by a BLR that is not yet fully formed rather than by continuum boosting by gravitational lensing or a soft continuum due to super-Eddington accretion.

引用

页数：20

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