HOT DUST OBSCURED GALAXIES WITH EXCESS BLUE LIGHT: DUAL AGN OR SINGLE AGN UNDER EXTREME CONDITIONS?

被引：49

作者：

Assef, R. J. ^{[1
]}

Walton, D. J. ^{[2
]}

Brightman, M. ^{[2
]}

Stern, D. ^{[3
]}

Alexander, D. ^{[4
]}

Bauer, F. ^{[5
,6
,7
]}

Blain, A. W. ^{[8
]}

Diaz-Santos, T. ^{[1
]}

Eisenhardt, P. R. M. ^{[3
]}

Finkelstein, S. L. ^{[9
]}

Hickox, R. C. ^{[10
]}

Tsai, C-W ^{[3
]}

Wu, J. W. ^{[11
]}

机构：

[1] Univ Diego Portales, Nucleo Astron, Fac Ingn, Ave Ejercito Libertador 441, Santiago, Chile

[2] CALTECH, Space Radiat Lab, Pasadena, CA 91125 USA

[3] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr,Mail Stop 169-236, Pasadena, CA 91109 USA

[4] Univ Durham, Dept Phys, Durham DH1 3LE, England

[5] Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Casilla 306, Santiago 22, Chile

[6] Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA

[7] MAS, Millennium Inst Astrophys, Nuncio Monsenor Sotero Sanz 100, Providencia, Santiago De Chi, Chile

[8] Univ Leicester, Phys & Astron, 1 Univ Rd, Leicester LE1 7RH, Leics, England

[9] Univ Texas Austin, 2515 Speedway,Stop C1400, Austin, TX 78712 USA

[10] Dartmouth Coll, Dept Phys & Astron, 6127 Wilder Lab, Hanover, NH 03755 USA

[11] UCLA Astron, POB 951547, Los Angeles, CA 90095 USA

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 819卷 / 02期

基金：

美国安德鲁·梅隆基金会; 美国国家航空航天局; 美国国家科学基金会;

关键词：

galaxies: active; galaxies: evolution; galaxies: high-redshift; infrared: galaxies; quasars: general; ACTIVE GALACTIC NUCLEI; HARD X-RAY; STAR-FORMING GALAXIES; SPECTRAL ENERGY-DISTRIBUTIONS; XMM-NEWTON OBSERVATIONS; DIGITAL SKY SURVEY; HIGH-REDSHIFT; BROAD-BAND; ULTRAVIOLET-SPECTRA; LUMINOSITY FUNCTION;

D O I：

10.3847/0004-637X/819/2/111

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Hot dust-obscured galaxies (Hot DOGs) are a population of hyper-luminous infrared galaxies identified by the Wide-field Infrared Survey Explorer (WISE) mission from their very red mid-IR colors, and characterized by hot dust temperatures (T > 60 K). Several studies have shown clear evidence that the IR emission in these objects is powered by a highly dust-obscured active galactic nucleus (AGN) that shows close to Compton-thick absorption at X-ray wavelengths. Thanks to the high AGN obscuration, the host galaxy is easily observable, and has UV/optical colors usually consistent with those of a normal galaxy. Here we discuss a sub-population of eight Hot DOGs that show enhanced rest-frame UV/optical emission. We discuss three scenarios that might explain the excess UV emission: (i) unobscured light leaked from the AGN by reflection over the dust or by partial coverage of the accretion disk; (ii) a second unobscured AGN in the system; or (iii) a luminous young starburst. X-ray observations can help discriminate between these scenarios. We study in detail the blue excess Hot DOG WISE J020446.13-050640.8, which was serendipitously observed by Chandra/ACIS-I for 174.5 ks. The X-ray spectrum is consistent with a single, hyper-luminous, highly absorbed AGN, and is strongly inconsistent with the presence of a secondary unobscured AGN. Based on this, we argue that the excess blue emission in this object is most likely either due to reflection or a co-eval starburst. We favor the reflection scenario as the unobscured star formation rate needed to power the UV/optical emission would be greater than or similar to 1000M(circle dot) yr(-1). Deep polarimetry observations could confirm the reflection hypothesis.

引用

页数：12

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