2001ApJ...559..167G


Query : 2001ApJ...559..167G

2001ApJ...559..167G - Astrophys. J., 559, 167-172 (2001/September-3)

X-ray emission from the nucleus of the dwarf elliptical galaxy NGC 3226.

GEORGE I.M., MUSHOTZKY R.F., YAQOOB T., TURNER T.J., KRAEMER S., PTAK A.F., NANDRA K., CRENSHAW D.M. and NETZER H.

Abstract (from CDS):

We present the first high-resolution X-ray image of the dwarf elliptical galaxy NGC 3226. The data were obtained during an observation of the nearby Seyfert Galaxy NGC 3227 using the Chandra X-Ray Observatory. We detect a point X-ray source spatially consistent with the optical nucleus of NGC 3226 and a recently detected, compact, flat-spectrum radio source. The X-ray spectrum can be measured up to ∼10 keV and is consistent with a power law with a photon index 1.7≲Γ≲2.2 or thermal bremsstrahlung emission with 4 keV≲kT≲10 keV. In both cases, the luminosity in the 2-10 keV band ≃1040 h–175 ergs s–1. We find marginal evidence that the nucleus varies within the observation. These characteristics support evidence from other wave bands that NGC 3226 harbors a low-luminosity active nucleus. We also comment on two previously unknown, fainter X-ray sources ≲15" from the nucleus of NGC 3226. Their proximity to the nucleus (with projected distances of ≲1.3 h–175 kpc) suggests both are within NGC 3226 and thus have luminosities (approximately a few times 1038 to a few times 1039 ergs.s–1) consistent with black hole binary systems.

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Journal keyword(s): Galaxies: Active - Galaxies: Dwarf - galaxies: individual (NGC 3226) - Galaxies: Nuclei - X-Rays: Binaries - X-Rays: Galaxies

Simbad objects: 7

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Number of rows : 7
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 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
2 CXOU J102326.7+195407 X 10 23 26.7 +19 54 07           ~ 4 0
3 NGC 3226 rG 10 23 27.0064075320 +19 53 54.674937420   14.32 13.33     ~ 440 1
4 NGC 3227 Sy1 10 23 30.5765149296 +19 51 54.282206700   12.61 11.79     ~ 1807 2
5 CXOU J102334.1+195347 X 10 23 34.1 +19 53 47           ~ 3 0
6 NGC 3516 Sy1 11 06 47.4632200800 +72 34 07.298374656   13.12 12.40     ~ 1638 0
7 M 58 Sy2 12 37 43.59747 +11 49 05.1240 10.80 10.48 9.66     ~ 1140 2

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