ChandraObservations of Arp 220: The Nuclear Source | Zendy

D. L. Clements | Zendy; Jonathan McDowell | Zendy; S. Shaked | Zendy; A. C. Baker | Zendy; K. D. Borne | Zendy; L. Colina | Zendy; S. A. Lamb | Zendy; C. G. Mundell | Zendy

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ChandraObservations of Arp 220: The Nuclear Source

Author(s) -

D. L. Clements,

Jonathan McDowell,

S. Shaked,

A. C. Baker,

K. D. Borne,

L. Colina,

S. A. Lamb,

C. G. Mundell

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/344439

Subject(s) - physics , astrophysics , luminosity , nucleus , point source , galaxy , acis , active galactic nucleus , astronomy , medicine , psychiatry , optics

We present the first results from 60ks of observations of Arp 220 using theACIS-S instrument on Chandra. We report the detection of several sources nearthe galaxy's nucleus, including a point source with a hard spectrum that iscoincident with the western radio nucleus B. This point source is mildlyabsorbed (N_H ~ 3 x 10^22 cm^-2) and has an estimated luminosity of 4 x 10^40erg/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 nuclear2-10 keV X-ray luminosity to 1.2 x 10^41 erg/s, but we cannot rule out a hiddenAGN behind columns exceeding 5 x 10^24 cm^-2. We also detect a peak of softX-ray emission to the west of the nucleus, and a hard point source 2.5 kpc fromthe nucleus with a luminosity of 6 x 10^39 erg/s.

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