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Chandra Observations of Arp 220: The Nuclear Source | | D.L. Clements
; J.C. McDowell
; S. Shaked
; A.C. Baker
; K. Borne
; L. Colina
; S. Lamb
; C. Mundell
; | | Date: |
27 Aug 2002 | | Journal: | Astrophys.J. 581 (2002) 974-980 | | Subject: | astro-ph | | Affiliation: | Imperial College, London; Cardiff University), J.C. McDowell (CfA), S. Shaked (Univ. Arizona), A.C. Baker (Cardiff University), K. Borne (RITSS), L. Colina (CSIC, Madrid), S. Lamb (Univ. Illinois U-C.), C. Mundell (ARI, Liverpool John Moores Univ. | | Abstract: | We present the first results from 60ks 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 ~ 3 x 10^22 cm^-2) and has an estimated luminosity of 4 x 10^40 erg/s. 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 erg/s, but we cannot rule out a hidden AGN 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 erg/s. | | Source: | arXiv, astro-ph/0208477 | | Services: | Forum | Review | PDF | Favorites | |
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