Abstract
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 ∼ 3 × 1022 cm-2) and has an estimated luminosity of 4 × 1040 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 × 1041 ergs s-1, but we cannot rule out a hidden active galactic nucleus behind columns exceeding 5 × 1024 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 × 1039 ergs s-1.
Original language | English |
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Pages (from-to) | 974-980 |
Number of pages | 7 |
Journal | Astrophysical Journal |
Volume | 581 |
Issue number | 2 I |
DOIs | |
Publication status | Published - 20 Dec 2002 |
Keywords
- Galaxies: active
- Galaxies: individual (Arp 220)
- Galaxies: interactions
- Galaxies: starburst
- X-rays: galaxies
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Space and Planetary Science