2014ApJ...781..107K

Query : 2014ApJ...781..107K

2014ApJ...781..107K - Astrophys. J., 781, 107 (2014/February-1)

First hard X-ray detection of the non-thermal emission around the Arches cluster: morphology and spectral studies with NuSTAR.

KRIVONOS R.A., TOMSICK J.A., BAUER F.E., BAGANOFF F.K., BARRIERE N.M., BODAGHEE A., BOGGS S.E., CHRISTENSEN F.E., CRAIG W.W., GREFENSTETTE B.W., HAILEY C.J., HARRISON F.A., HONG J., MADSEN K.K., MORI K., NYNKA M., STERN D. and ZHANG W.W.

Abstract (from CDS):

The Arches cluster is a young, densely packed massive star cluster in our Galaxy that shows a high level of star formation activity. The nature of the extended non-thermal X-ray emission around the cluster remains unclear. The observed bright Fe Kα line emission at 6.4 keV from material that is neutral or in a low ionization state can be produced either by X-ray photoionization or by cosmic-ray particle bombardment or both. In this paper, we report on the first detection of the extended emission around the Arches cluster above 10 keV with the NuSTAR mission, and present results on its morphology and spectrum. The spatial distribution of the hard X-ray emission is found to be consistent with the broad region around the cluster where the 6.4 keV line is observed. The interpretation of the hard X-ray emission within the context of the X-ray reflection model puts a strong constraint on the luminosity of the possible illuminating hard X-ray source. The properties of the observed emission are also in broad agreement with the low-energy cosmic-ray proton excitation scenario.

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Journal keyword(s): cosmic rays - Galaxy: center - ISM: general - X-rays: individual: Arches cluster

Simbad objects: 14

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Number of rows : 14
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 KS 1731-260 LXB 17 34 13.46 -26 05 18.6       22.8 20.9 ~ 437 0
2 2E 3938 HXB 17 43 54.7 -29 44 44           ~ 693 1
3 SWIFT J174510.8-262411 LXB 17 45 10.849 -26 24 12.60           ~ 78 0
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
5 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
6 [YLW2002] A1 X 17 45 50 -28 49.3           ~ 10 0
7 WR 102ae WR* 17 45 50.28 -28 49 11.4           WN9h 40 0
8 [YLW2002] A1S X 17 45 50.3 -28 49 22           ~ 7 0
9 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 792 0
10 [YLW2002] A1N X 17 45 50.5 -28 49 19           ~ 7 0
11 2E 3944 LXB 17 46 21.1 -28 43 39     12.50     ~ 126 0
12 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2443 1
13 X Sgr X-1 LXB 17 47 56.3 -26 33 47           ~ 402 0
14 NAME Galactic Ridge ? ~ ~           ~ 543 1

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