2001MNRAS.326..894I

Query : 2001MNRAS.326..894I

2001MNRAS.326..894I - Mon. Not. R. Astron. Soc., 326, 894-900 (2001/September-3)

A hard X-ray constraint on the presence of an AGN in the ultraluminous infrared galaxy Arp 220.

IWASAWA K., MATT G., GUAINAZZI M. and FABIAN A.C.

Abstract (from CDS):

We present X-ray results on the ultraluminous infrared galaxy Arp 220 obtained with BeppoSAX. X-ray emission up to 10keV is detected. No significant signal is detected with the PDS detector in the higher energy band. The 2-10keV emission has a flat spectrum (Γ∼1.7), similar to M82, and a luminosity of ∼1x1041erg.s–1. A population of X-ray binaries may be a major source of this X-ray emission. The upper limit of an iron K line equivalent width at 6.4keV is ≃600eV. This observation imposes the tightest constraint so far on an active nucleus if present in Arp 220. We find that a column density of X-ray absorption must exceed 1025cm–2 for an obscured active nucleus to be significant in the energetics, and the covering factor of the absorption should be almost unity. The underluminous soft X-ray starburst emission may need a good explanation, if the bolometric luminosity is primarily powered by a starburst.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): galaxies: active - galaxies: individual: Arp 220 - galaxies: starburst - X-rays: galaxies

Simbad objects: 23

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Number of rows : 23
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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
2 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
3 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 756 3
4 NGC 2146 AGN 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 765 2
5 NGC 2623 LIN 08 38 24.016 +25 45 16.29 14.10 13.99 13.36     ~ 533 2
6 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
7 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1476 3
8 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 920 2
9 NGC 3310 AGN 10 38 45.85707 +53 30 11.8940   12.45 12.15     ~ 809 1
10 NGC 3628 LIN 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 853 3
11 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 1015 4
12 NGC 3690B GiP 11 28 31.02 +58 33 40.7   11.8       ~ 635 4
13 NGC 3690NE AGN 11 28 33.07 +58 33 54.2   11.8       ~ 635 4
14 NGC 4038 EmG 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1364 1
15 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1749 0
16 NGC 4039 GiP 12 01 53.51 -18 53 10.3   11.08   9.77   ~ 1173 1
17 NGC 4631 GiC 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1154 3
18 NGC 4666 AGN 12 45 08.676 -00 27 42.88   11.7   11.5 10.7 ~ 421 1
19 Z 294-4 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 2096 3
20 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
21 Z 271-60 Sy2 13 44 42.1883001099 +55 53 13.596220922   15.68 14.91     ~ 958 3
22 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
23 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1734 2

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