2005MNRAS.357.1003E

Query : 2005MNRAS.357.1003E

2005MNRAS.357.1003E - Mon. Not. R. Astron. Soc., 357, 1003-1012 (2005/March-1)

Extended emission associated with young HII regions.

ELLINGSEN S.P., SHABALA S.S. and KURTZ S.E.

Abstract (from CDS):

We have used the Australia Telescope Compact Array (ATCA) to make observations of a sample of eight young ultra-compact HII regions, selected on the basis that they have associated class II methanol maser emission. We have made observations sensitive to both compact and extended structures and find both to be present in most sources. The scale of the extended emission in our sample is in general less than that observed towards samples based on IRAS properties, or large single-dish flux densities. Our observations are consistent with a scenario where extended and compact radio continuum emission co-exists within HII regions for a significant period of time.

We suggest that these observations are consistent with a model where HII evolution takes place within hierarchically structured molecular clouds. This model, which is the subject of an upcoming companion paper by Shabala et al., addresses both the association between compact and extended emission and the ultra-compact HII region lifetime problem.


Abstract Copyright: 2005 RAS

Journal keyword(s): masers - stars: formation - HII regions - ISM: structure - radio lines: ISM

Simbad objects: 29

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Number of rows : 29
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 RAFGL 4176 Y*O 13 43 01.70352 -62 08 51.2304           ~ 163 0
2 [GGB2012] G308.9176+00.1231 HII 13 43 02.1 -62 08 52           ~ 59 0
3 OH 309.92+00.48 Mas 13 50 41.78 -61 35 10.2           ~ 50 0
4 IRAS 13471-6120 cor 13 50 41.810 -61 35 10.67           ~ 65 0
5 GAL 309.92+00.48 HII 13 50 42.0 -61 35 09           ~ 34 0
6 RAFGL 4972S cor 15 00 34.52760 -58 58 08.9076           ~ 51 1
7 OH 318.95-00.20 Y*O 15 00 55.35024 -58 58 53.2848           ~ 85 1
8 IRAS 15520-5234 HII 15 55 48.336 -52 43 10.20           ~ 59 1
9 Caswell CH3OH 328.809+00.633 Mas 15 55 48.70 -52 43 05.5           ~ 24 0
10 SPICY 38479 Y*? 16 34 11.286 -48 06 27.09           ~ 3 0
11 [PNE98] 336.410-0.256 Mas 16 34 13.18 -48 06 15.6           ~ 2 0
12 Caswell CH3OH 336.41-00.26 Mas 16 34 13.20 -48 06 20.9           ~ 23 0
13 MMB G336.433-00.262 Mas 16 34 20.22 -48 05 32.2           ~ 25 0
14 OH 339.88-01.26 Y*O 16 52 04.6776 -46 08 34.404           ~ 119 1
15 IRAS 16533-4009 HII 16 56 45.58 -40 14 32.4           ~ 49 0
16 OH 345.01+01.79 Mas 16 56 47.58 -40 14 25.8           ~ 72 0
17 NAME NGC 6334 FIR V Cl* 17 19 57 -35 57.5           ~ 99 0
18 NGC 6334A HII 17 20 19.3 -35 54 55           ~ 123 0
19 NGC 6334B rG 17 20 21.810 -35 52 48.25           ~ 113 0
20 NGC 6334E HII 17 20 50.9 -35 46 06           ~ 52 0
21 NGC 6334 HII 17 20 53 -36 07.9           ~ 740 0
22 [HG83] IRS-I-2 IR 17 20 53.1 -35 46 59           ~ 15 0
23 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 373 0
24 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 244 1
25 NAME NGC 6334 I(N) smm 17 20 54 -35 45.0           ~ 165 1
26 Caswell CH3OH 351.445+00.660 Mas 17 20 54.61 -35 45 08.6           ~ 17 0
27 GAL 033.13-00.09 HII 18 52 07.96 +00 08 11.6           ~ 27 1
28 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
29 GAL 109.88+02.11 HII 22 56 19.4 +62 02 01           ~ 76 0

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