2006ApJ...649L.123E

Query : 2006ApJ...649L.123E

2006ApJ...649L.123E - Astrophys. J., 649, L123-L128 (2006/October-1)

The discovery of diffuse X-ray emission in NGC 2024, one of the nearest massive star-forming regions.

EZOE Y., KOKUBUN M., MAKISHIMA K., SEKIMOTO Y. and MATSUZAKI K.

Abstract (from CDS):

We analyzed deep 75 ks Chandra ACIS-I data of NGC 2024 with the aim of searching for diffuse X-ray emission in this most nearby (415 pc) of massive star-forming regions. After removing point sources, extended emission was detected in the central circular region with a radius of 0.5 pc, and it is spatially associated with this young massive stellar cluster. Its X-ray spectrum exhibits a very hard continuum (kT>8 keV) and shows signs of having a He-like Fe Kα line with a 0.5-7 keV absorption-corrected luminosity of 2x1031 ergs/s. Undetected faint point sources, estimated from the luminosity function of the detected sources, contribute less than 10% to this emission. Hence, the emission is truly diffuse in nature. Because of the proximity of NGC 2024 and the long exposure, this discovery is one of the strongest pieces of evidence in support of the existence of diffuse X-ray emission in massive star-forming regions.

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Journal keyword(s): ISM: H II Regions - ISM: Individual: NGC Number: NGC 2024 - Stars: Early-Type - Stars: Formation - Stars: Winds, Outflows

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 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
2 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
3 [MCK88] NGC 2024 FIR 1 FIR 05 41 41.40 -01 53 47.0           ~ 37 0
4 [MCK88] NGC 2024 FIR 2 Y*? 05 41 42.50 -01 54 06.0           ~ 38 0
5 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 715 1
6 [MCK88] NGC 2024 FIR 3 Y*O 05 41 43.00 -01 54 24.0           ~ 52 0
7 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
8 [MCK88] NGC 2024 FIR 4 Y*O 05 41 44.00 -01 54 42.0           ~ 55 0
9 [MCK88] NGC 2024 FIR 5 cor 05 41 44.6 -01 55 38           ~ 98 0
10 [MCK88] NGC 2024 FIR 7 cor 05 41 44.90 -01 56 15.0           ~ 33 0
11 [MCK88] NGC 2024 FIR 6 IR 05 41 45.00 -01 56 01.0           ~ 56 0
12 [BCB89] IRS 2b Y*O 05 41 45.490 -01 54 28.78           O8V 57 1
13 [BCB89] IRS 2 Y*O 05 41 45.81 -01 54 29.8           B 105 0
14 IRAS 05393-0156 HII 05 41 45.9 -01 54 32           ~ 38 0
15 NAME Rosette Nebula HII 06 32 26.76 +04 47 37.1           ~ 522 1
16 RCW 38 SFR 08 59 05.50 -47 30 39.4           ~ 327 2
17 GUM 29 HII 10 24 14.6 -57 46 58           ~ 219 0
18 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
19 NGC 6334 HII 17 20 53 -36 07.9           ~ 740 0
20 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 792 0
21 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 561 0
22 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
23 W 51a HII 19 23 29.3 +14 31 38           ~ 186 0

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