The location of an active nucleus and a shadow of a tidal tail in the ULIRG Mrk 273

被引：21

作者：

Iwasawa, K. ^{[1
,2
]}

Mazzarella, J. M. ^{[3
]}

Surace, J. A. ^{[4
]}

Sanders, D. B. ^{[5
]}

Armus, L. ^{[4
]}

Evans, A. S. ^{[6
,7
]}

Howell, J. H. ^{[4
]}

Komossa, S. ^{[8
]}

Petric, A. ^{[4
]}

Teng, S. H. ^{[5
,9
]}

U, V.

Veilleux, S. ^{[9
]}

机构：

[1] Univ Barcelona IEEC UB, ICREA, Barcelona 08028, Spain

[2] Univ Barcelona IEEC UB, Inst Ciencies Cosmos, Barcelona 08028, Spain

[3] CALTECH, IPAC, Pasadena, CA 91125 USA

[4] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA

[5] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[6] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA

[7] NRAO, Charlottesville, VA 22903 USA

[8] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

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

来源：

ASTRONOMY & ASTROPHYSICS | 2011年 / 528卷

关键词：

galaxies: active; X-rays: galaxies; galaxies: individual: Mrk 273; infrared: galaxies; ULTRALUMINOUS INFRARED GALAXIES; X-RAY; XMM-NEWTON; GALACTIC NUCLEUS; IRAS GALAXIES; CHANDRA; SPECTROSCOPY; STARBURST; SAMPLE; ATLAS;

D O I：

10.1051/0004-6361/201015872

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Analysis of data from the Chandra X-ray Observatory for the double nucleus ULIRG Mrk 273 reveals an absorbed hard X-ray source coincident with the southwest nucleus, implying that this unresolved, near-infrared source is where an active nucleus resides, while the northern nuclear region contains a powerful starburst that dominates the far infrared luminosity. There is evidence of a slight image extension in the 6-7 keV band, where an Fe K line is present, towards the northern nucleus. A large-scale, diffuse emission nebula detected in soft X-rays contains a dark lane that spatially coincides with a high surface-brightness tidal tail extending similar to 50 arcsec (40 kpc) to the south. The soft X-ray source is likely located behind the tidal tail, which absorbs X-ray photons along the line of sight. The estimated column density of cold gas in the tidal tail responsible for shadowing the soft X-rays is N(H) >= 6 x 10(21) cm(-2), consistent with the tidal tail having an edge-on orientation.

引用

页数：7

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