2002ApJ...581..974C

Query : 2002ApJ...581..974C

2002ApJ...581..974C - Astrophys. J., 581, 974-980 (2002/December-3)

Chandra observations of Arp 220: the nuclear source.

CLEMENTS D.L., McDOWELL J.C., SHAKED S., BAKER A.C., BORNE K., COLINA L., LAMB S.A. and MUNDELL C.

Abstract (from CDS):

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 (NH∼3x1022cm–2) and has an estimated luminosity of 4x1040 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 1.2x1041 ergs.s–1, but we cannot rule out a hidden active galactic nucleus behind columns exceeding 5x1024cm–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 6x1039 ergs.s–1.

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Journal keyword(s): Galaxies: Active - Galaxies: Individual: Name: Arp 220 - Galaxies: Interactions - Galaxies: Starburst - X-Rays: Galaxies

Nomenclature: Table 1: [CMS2002] X-N (Nos X-1 to X-4), [CMS2002] X-1 halo N=1.

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SN 1986J SN* 02 22 31.33 +42 19 56.4   18.4 18.4     SNII 331 1
2 SN 1978K SN* 03 17 38.620 -66 33 03.40   13.0       SNII 214 1
3 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1507 1
4 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
5 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 920 2
6 Z 271-60 Sy2 13 44 42.1883001099 +55 53 13.596220922   15.68 14.91     ~ 958 3
7 [CMS2002] X-2 X 15 34 56.94 +23 30 05.5           ~ 2 0
8 [CMS2002] X-3 X 15 34 57.14 +23 30 13.1           ~ 3 0
9 [CMS2002] X-1 X 15 34 57.21 +23 30 11.7           ~ 4 0
10 APG 220A PoG 15 34 57.22 +23 30 11.4           ~ 72 1
11 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
12 [CMS2002] X-4 X 15 34 57.25 +23 30 11.5           ~ 4 0
13 APG 220B PoG 15 34 57.28 +23 30 11.3           ~ 54 1
14 [CMS2002] X-1 halo X 15 34 57.28 +23 30 11.4           ~ 1 0
15 NGC 7469 Sy1 23 03 15.6 +08 52 26 12.60 13.00 12.34     ~ 2253 3

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