Chandra observations of ARP 220:: The nuclear source

被引：56

作者：

Clements, DL

McDowell, JC

Shaked, S

Baker, AC

Borne, K

Colina, L

Lamb, SA

Mundell, C

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BW, England

[2] Cardiff Univ, Dept Phys & Astron, Cardiff CF24 3YB, S Glam, Wales

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

[4] Univ Arizona, Dept Astron, Tucson, AZ 85721 USA

[5] NASA, Raytheon Informat Technol & Sci Serv, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[6] CSIC, Inst Estructura Mat, E-28006 Madrid, Spain

[7] Univ Illinois, Loomis Lab Phys, Ctr Theoret Astrophys, Dept Phys, Urbana, IL 61801 USA

[8] Liverpool John Moores Univ, Astrophys Res Inst, Wirral CH41 1LD, Cheshire, England

[9] Univ Illinois, Loomis Lab Phys, Ctr Theoret Astrophys, Dept Astron, Urbana, IL 61801 USA

来源：

ASTROPHYSICAL JOURNAL | 2002年 / 581卷 / 02期

关键词：

galaxies : active; galaxies : individual (Arp 220); galaxies : interactions; galaxies : starburst; X-rays : galaxies;

D O I：

10.1086/344439

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first results from 60 ks of observations of Arp 220 using the ACIS-S instrument on Chandra. We report the detection of several sources near the galaxy's nucleus, including a point source with a hard spectrum that is coincident with the western radio nucleus B. This point source is mildly absorbed (N-H similar to 3 x 10(22) cm(-2)) and has an estimated luminosity of 4 x 10(40) ergs s(-1). In addition, a fainter source may coincide with the eastern nucleus A. Extended hard X-ray emission in the vicinity raises the total estimated nuclear 2-10 keV X-ray luminosity to 1.2 x 10(41) ergs s(-1), but we cannot rule out a hidden active galactic nucleus behind columns exceeding 5 x 10(24) cm(-2). We also detect a peak of soft X-ray emission to the west of the nucleus and a hard point source 2.5 kpc from the nucleus with a luminosity of 6 x 10(39) ergs s(-1).

引用

页码：974 / 980

页数：7

共 43 条

[31] Luminous infrared galaxies [J].