NuSTAR REVEALS AN INTRINSICALLY X-RAY WEAK BROAD ABSORPTION LINE QUASAR IN THE ULTRALUMINOUS INFRARED GALAXY MARKARIAN 231

被引：80

作者：

Teng, Stacy H. ^{[1
]}

Brandt, W. N. ^{[2
]}

Harrison, F. A. ^{[3
]}

Luo, B. ^{[2
]}

Alexander, D. M. ^{[4
]}

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

Boggs, S. E. ^{[7
]}

Christensen, F. E. ^{[8
]}

Comastri, A. ^{[9
]}

Craig, W. W. ^{[7
,10
]}

Fabian, A. C. ^{[11
]}

Farrah, D. ^{[12
]}

Fiore, F. ^{[13
]}

Gandhi, P. ^{[4
]}

Grefenstette, B. W. ^{[3
]}

Hailey, C. J. ^{[14
]}

Hickox, R. C. ^{[15
]}

Madsen, K. K. ^{[3
]}

Ptak, A. F. ^{[16
]}

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

Risaliti, G. ^{[17
,18
]}

Saez, C.

Stern, D. ^{[19
]}

Veilleux, S. ^{[20
,21
]}

Walton, D. J. ^{[3
]}

Wik, D. R. ^{[16
]}

Zhang, W. W. ^{[16
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Observat Cosmol Lab, Greenbelt, MD 20771 USA

[2] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

[3] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

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

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

[6] Space Sci Inst, Boulder, CO 80301 USA

[7] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[8] Tech Univ Denmark, DTU Space Natl Space Inst, DK-2800 Lyngby, Denmark

[9] INAF Osserv Astron Bologna, I-40127 Bologna, Italy

[10] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[11] Inst Astron, Cambridge CB3 0HA, England

[12] Virginia Tech, Dept Phys, Blacksburg, VA 24061 USA

[13] Osserv Astron Roma, I-00040 Monte Porzio Catone, Italy

[14] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA

[15] Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA

[16] NASA, Goddard Space Flight Ctr, Xray Astrophys Lab, Greenbelt, MD 20771 USA

[17] INAF Osserv Astrofis Arcetri, I-50125 Florence, Italy

[18] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[19] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[20] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[21] Univ Maryland, Joint Space Sci Inst, College Pk, MD 20742 USA

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 785卷 / 01期

基金：

美国国家航空航天局;

关键词：

galaxies: active; quasars: individual (Mrk 231); X-rays: galaxies; ACTIVE GALACTIC NUCLEI; ADVECTION-DOMINATED ACCRETION; STAR-FORMING GALAXIES; XMM-NEWTON; CHANDRA SURVEY; EMISSION-LINE; LOCAL ULIRGS; STARBURST GALAXY; SPACE-TELESCOPE; DISK WINDS;

D O I：

10.1088/0004-637X/785/1/19

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present high-energy (3-30 keV) NuSTAR observations of the nearest quasar, the ultraluminous infrared galaxy (ULIRG) Markarian 231 (Mrk 231), supplemented with new and simultaneous low-energy (0.5-8 keV) data from Chandra. The source was detected, though at much fainter levels than previously reported, likely due to contamination in the large apertures of previous non-focusing hard X-ray telescopes. The full band (0.5-30 keV) X-ray spectrum suggests the active galactic nucleus (AGN) in Mrk 231 is absorbed by a patchy and Compton-thin (N-H similar to 1.2(-0.3)(+0.3) Chi 10(23) cm(-2)) column. The intrinsic X-ray luminosity (L0.5-30 keV similar to 1.0 Chi 10(43) erg s(-1)) is extremely weak relative to the bolometric luminosity where the 2-10 keV to bolometric luminosity ratio is similar to 0.03% compared to the typical values of 2%-15%. Additionally, Mrk 231 has a low X-ray-to-optical power law slope (alpha(OX) similar to -1.7). It is a local example of a low-ionization broad absorption line quasar that is intrinsically X-ray weak. The weak ionizing continuum may explain the lack of mid-infrared [O Iv], [Ne v], and [Ne vI] fine-structure emission lines which are present in sources with otherwise similar AGN properties. We argue that the intrinsic X-ray weakness may be a result of the super-Eddington accretion occurring in the nucleus of this ULIRG, and may also be naturally related to the powerful wind event seen in Mrk 231, a merger remnant escaping from its dusty cocoon.

引用

页数：13

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