2006ApJ...653..409T


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET09:34:40

2006ApJ...653..409T - Astrophys. J., 653, 409-415 (2006/December-2)

Hard X-rays from ultracompact H II regions in W49A.

TSUJIMOTO M., HOSOKAWA T., FEIGELSON E.D., GETMAN K.V. and BROOS P.S.

Abstract (from CDS):

We report the Chandra detection of hard X-ray emission from the Welch ring in W49A, an organized structure of ultracompact (UC) H II regions containing a dozen nascent early-type stars. Two UC H II regions are associated with hard X-ray emission in a deep Advanced CCD Imaging Spectrometer (ACIS) image exposed for ∼96.7 ks. One of the two X-ray sources has no near-infrared counterpart and is extended by ∼5", or ∼0.3 pc, at a distance of ∼11.4 kpc, which is spatially aligned with the cometary radio continuum emission associated with the UC H II region. The X-ray spectrum of the emission, when fit with a thermal model, indicates a heavily absorbed plasma with extinction of ∼5x1023/cm2, temperature ∼7 keV, and X-ray luminosity in the 3.0-8.0 keV band of ∼3x1033 ergs/s. Both the luminosity and the size of the emission resemble the extended hard emission found in UC H II regions in Sagittarius B2, yet they are smaller by an order of magnitude than the emission found in massive star clusters such as NGC 3603. Three possibilities are discussed for the cause of the hard extended emission in the Welch ring: an ensemble of unresolved point sources, shocked interacting winds of the young O stars, and a wind-blown bubble interacting with ambient cold matter.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - ISM: Individual: Alphanumeric: W49A - Radio Continuum: ISM - Stars: Early-Type - X-Rays: ISM

Simbad objects: 41

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Number of rows : 41

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1912 1
2 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1257 1
3 NAME Rosette Nebula HII 06 31 40 +04 57.8           ~ 431 1
4 HD 50896 WR* 06 54 13.0440847499 -23 55 42.020318514 5.74 6.63 6.91 7.74   WN4b 731 0
5 RCW 38 SFR 08 59 05.50 -47 30 39.4           ~ 260 2
6 NGC 3603 HII 11 15 24 -61 15.0           ~ 924 2
7 NGC 6334 HII 17 20 51 -36 06.9           ~ 563 0
8 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11084 0
9 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 615 0
10 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 427 0
11 CXOU J174720.2-282305 X 17 47 20.15 -28 23 05.8           ~ 5 0
12 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1860 1
13 [TMK2002] 13 X 17 47 20.7519037364 -28 23 05.054773919           ~ 3 0
14 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1459 0
15 CXOU J191010.4+090528 X 19 10 10.4 +09 05 28           ~ 1 0
16 [DJW84] W49 A HII 19 10 12.93 +09 06 11.9           ~ 28 0
17 [DJW84] W49 C1 Rad 19 10 13.16 +09 06 12.5           ~ 4 0
18 [DJW84] W49 B HII 19 10 13.19 +09 06 12.8           ~ 16 0
19 [DJW84] W49 C HII 19 10 13.19 +09 06 18.8           ~ 16 0
20 [DJW84] W49 D HII 19 10 13.26 +09 06 11.4           ~ 16 0
21 [DJW84] W49 B1 Rad 19 10 13.26 +09 06 15.0           ~ 10 0
22 [DJW84] W49 E HII 19 10 13.30 +09 06 12.5           ~ 11 0
23 [DJW84] W49 F HII 19 10 13.38 +09 06 21.5           ~ 16 0
24 [DJW84] W49 G2a Rad 19 10 13.417 +09 06 13.14           ~ 10 0
25 [DJW84] W49 G1 HII 19 10 13.42 +09 06 12.8           ~ 17 0
26 [DJW84] W49 G2b Rad 19 10 13.450 +09 06 12.98           ~ 9 0
27 CXOU J191013.5+090612 X 19 10 13.5 +09 06 12           ~ 1 1
28 [DJW84] W49 G3 Rad 19 10 13.55 +09 06 12.1           ~ 10 0
29 [DJW84] W49 G HII 19 10 13.57 +09 06 12.9           ~ 22 0
30 [DJW84] W49 G4 Rad 19 10 13.57 +09 06 13.5           ~ 10 0
31 [DJW84] W49 H HII 19 10 13.64 +09 06 17.2           ~ 10 0
32 [DJW84] W49 G5 Rad 19 10 13.66 +09 06 12.4           ~ 10 0
33 [DJW84] W49 I HII 19 10 13.73 +09 06 24.9           ~ 10 0
34 [DJW84] W49 J1 Rad 19 10 14.13 +09 06 25.2           ~ 5 0
35 [DJW84] W49 J HII 19 10 14.14 +09 06 15.4           ~ 12 0
36 [DJW84] W49 J2 Rad 19 10 14.18 +09 06 26.7           ~ 7 0
37 [DJW84] W49 M HII 19 10 14.74 +09 06 25.4           ~ 8 0
38 W 49a SFR 19 10 15.7 +09 06 05           ~ 255 2
39 W 49b SNR 19 11 09.000 +09 06 24.00           ~ 384 1
40 NGC 6888 ISM 20 12 07 +38 21.3   7.44       WN6b(h) 256 1
41 [DJW84] W49 G2c Rad ~ ~           ~ 7 0

    Equat.    Gal    SGal    Ecl

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2019.12.12-09:34:40

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