Chandra observations of ARP 220: The nuclear source

D. L. Clements; J. C. McDowell; S. Shaked; A. C. Baker; K. Borne; L. Colina; S. A. Lamb; C. Mundell

doi:10.1086/344439

Chandra observations of ARP 220: The nuclear source

D. L. Clements
, J. C. McDowell
, S. Shaked
, A. C. Baker
, K. Borne
, L. Colina
, S. A. Lamb
, C. Mundell

Department of Physics

Imperial College London
Cardiff University
Harvard University
The University of Arizona
NASA Goddard Space Flight Center
Instituto de Estructura de la Materia
University of Illinois at Urbana-Champaign
Liverpool John Moores University

Research output: Contribution to journal › Article › peer-review

58 Citations (SciVal)

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 (N_H ∼ 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
Pages (from-to)	974-980
Number of pages	7
Journal	The Astrophysical Journal
Volume	581
Issue number	2 I
DOIs	https://doi.org/10.1086/344439
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

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10.1086/344439

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title = "Chandra observations of ARP 220: The nuclear source",

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.",

keywords = "Galaxies: active, Galaxies: individual (Arp 220), Galaxies: interactions, Galaxies: starburst, X-rays: galaxies",

author = "Clements, \{D. L.\} and McDowell, \{J. C.\} and S. Shaked and Baker, \{A. C.\} and K. Borne and L. Colina and Lamb, \{S. A.\} and C. Mundell",

year = "2002",

month = dec,

day = "20",

doi = "10.1086/344439",

language = "English",

volume = "581",

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journal = "The Astrophysical Journal",

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TY - JOUR

T1 - Chandra observations of ARP 220

T2 - The nuclear source

AU - Clements, D. L.

AU - McDowell, J. C.

AU - Shaked, S.

AU - Baker, A. C.

AU - Borne, K.

AU - Colina, L.

AU - Lamb, S. A.

AU - Mundell, C.

PY - 2002/12/20

Y1 - 2002/12/20

N2 - 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.

AB - 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.

KW - Galaxies: active

KW - Galaxies: individual (Arp 220)

KW - Galaxies: interactions

KW - Galaxies: starburst

KW - X-rays: galaxies

UR - https://www.scopus.com/pages/publications/0038480999

U2 - 10.1086/344439

DO - 10.1086/344439

M3 - Article

AN - SCOPUS:0038480999

SN - 0004-637X

VL - 581

SP - 974

EP - 980

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 2 I

ER -

Chandra observations of ARP 220: The nuclear source

Abstract

Keywords

ASJC Scopus subject areas

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