FIRST-2MASS RED QUASARS: TRANSITIONAL OBJECTS EMERGING FROM THE DUST

被引:150
作者
Glikman, Eilat [1 ,2 ]
Urrutia, Tanya [3 ]
Lacy, Mark [4 ]
Djorgovski, S. George [5 ]
Mahabal, Ashish [5 ]
Myers, Adam D. [6 ]
Ross, Nicholas P. [7 ]
Petitjean, Patrick [8 ]
Ge, Jian [9 ]
Schneider, Donald P. [10 ,11 ]
York, Donald G. [12 ]
机构
[1] Yale Univ, Dept Phys, New Haven, CT 06520 USA
[2] Yale Univ, Yale Ctr Astron & Astrophys, New Haven, CT 06520 USA
[3] Leibniz Inst Astrophys, D-14482 Potsdam, Germany
[4] Natl Radio Astron Observ, Charlottesville, VA USA
[5] CALTECH, Dept Astron, Pasadena, CA 91125 USA
[6] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA
[7] Lawrence Berkeley Natl Lab, Berkeley, CA 92420 USA
[8] Univ Paris 06, CNRS, Inst Astrophys Paris, UMR7095, F-75014 Paris, France
[9] Univ Florida, Dept Astron, Bryant Space Sci Ctr 211, Gainesville, FL 32611 USA
[10] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA
[11] Penn State Univ, Inst Gravitat & Cosmos, University Pk, PA 16802 USA
[12] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA
基金
美国国家航空航天局; 美国国家科学基金会;
关键词
dust; extinction; quasars: general; surveys; DIGITAL-SKY-SURVEY; BROAD-ABSORPTION-LINE; ACTIVE GALACTIC NUCLEI; SUPERMASSIVE BLACK-HOLES; NEAR-INFRARED SPECTRA; HOST GALAXIES; X-RAY; DATA RELEASE; II QUASARS; LUMINOSITY FUNCTION;
D O I
10.1088/0004-637X/757/1/51
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a sample of 120 dust-reddened quasars identified by matching radio sources detected at 1.4 GHz in the Faint Images of the Radio Sky at Twenty Centimeters survey with the near-infrared Two Micron All Sky Survey catalog and color-selecting red sources. Optical and/or near-infrared spectroscopy provide broad wavelength sampling of their spectral energy distributions that we use to determine their reddening, characterized by E(B - V). We demonstrate that the reddening in these quasars is best described by Small-Magellanic-Cloud-like dust. This sample spans a wide range in redshift and reddening (0.1 less than or similar to z less than or similar to 3, 0.1 less than or similar to E(B - V) less than or similar to 1.5), which we use to investigate the possible correlation of luminosity with reddening. At every redshift, dust-reddened quasars are intrinsically the most luminous quasars. We interpret this result in the context of merger-driven quasar/galaxy coevolution where these reddened quasars are revealing an emergent phase during which the heavily obscured quasar is shedding its cocoon of dust prior to becoming a "normal" blue quasar. When correcting for extinction, we find that, depending on how the parent population is defined, these red quasars make up less than or similar to 15%-20% of the luminous quasar population. We estimate, based on the fraction of objects in this phase, that its duration is 15%-20% as long as the unobscured, blue quasar phase.
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页数:21
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