1999MNRAS.309..905W

Query : 1999MNRAS.309..905W

1999MNRAS.309..905W - Mon. Not. R. Astron. Soc., 309, 905-922 (1999/November-2)

Studies of ultracompact HII regions - III. Near-infrared survey of selected regions.

WALSH A.J., BURTON M.G., HYLAND A.R. and ROBINSON G.

Abstract (from CDS):

A survey towards a selection of 35 methanol maser and/or ultracompact (UC) Hii regions, reported in Papers I and II and by Norris et al., has been conducted in the near-infrared (NIR). Out of 25 methanol maser sites surveyed, 12 are associated with a NIR counterpart. Out of 18 UC Hii regions (8 of which overlap with maser emission), 12 are associated with a NIR counterpart. Counterparts can be confidently identified not only by the positional agreements, but also by their unusually red colours. Spectral types for the embedded stars can be unambiguously determined for six sources, all of which imply massive, ionizing stars. One of these infrared sources has methanol maser emission, but no UC Hii region. It is possible that the maser emission associated with this source arises from a pre-UC Hii phase of massive stellar evolution or it could be that nearly all the ultraviolet photons are absorbed by dust within the UC Hii region. We have modelled the spectral energy distributions (SEDs) for some sources and find that a single blackbody can be used to estimate the stellar luminosity, but cannot represent the whole infrared SED. A two-component blackbody model and a radiative transfer model were also used to derive essential parameters of the infrared sources. The radiative transfer model also indicates which infrared sources are relatively young and which are older. Both models show that silicate absorption at 9.7µm must be a dominant feature of these SEDs.

Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): masers - surveys - stars: formation - Hii regions - ISM: molecules - infrared: stars

Nomenclature: Table 1: [WBH99] JHHMMSS.s+DDMMSS N=83.

Simbad objects: 106

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Number of rows : 106
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 RCW 7 HII 07 32 09.59 -16 58 12.3           ~ 56 0
2 IRAS 07299-1651 Y*O 07 32 09.7800 -16 58 12.800           ~ 85 0
3 [WBH99] J073209.8-165814 * 07 32 09.8 -16 58 14           ~ 1 0
4 [WBH99] J073210.6-165758 * 07 32 10.6 -16 57 58           ~ 1 0
5 GAL 268.4-00.9 HII 09 01 54.3 -47 43 59           ~ 55 1
6 [WBH99] J090154.4-474334 * 09 01 54.4 -47 43 34           ~ 1 0
7 2MASS J09015447-4744112 Y*? 09 01 54.47 -47 44 11.2           ~ 5 0
8 [WBH99] J090154.7-474343 Y*? 09 01 54.75 -47 43 46.1           ~ 2 0
9 2MASS J09015507-4743503 Y*? 09 01 55.07472 -47 43 50.3040           ~ 3 0
10 2MASS J12345072-6139272 * 12 34 50.7226962648 -61 39 27.227374452           ~ 1 0
11 [WBH99] J123453.5-613948 * 12 34 53.5 -61 39 48           ~ 1 0
12 GUM 43 HII 12 34 54.4 -61 39 25           ~ 61 1
13 [WBH99] J123454.8-613942 * 12 34 54.8 -61 39 42           ~ 1 0
14 MSX5C G305.2017+00.2071 Y*O 13 11 10.45248 -62 34 38.6400           ~ 7 0
15 [WBH99] J131112.5-623439 * 13 11 12.5 -62 34 39           ~ 1 0
16 2MASS J13111304-6234317 * 13 11 13.04 -62 34 31.8           ~ 1 0
17 [WB2006] G305A Mas 13 11 14.4 -62 34 26           ~ 20 1
18 2MASS J13111705-6234311 LP? 13 11 17.0481438960 -62 34 31.272296304           ~ 2 0
19 2MASS J13111967-6234128 * 13 11 19.6728803232 -62 34 12.877299768           ~ 1 0
20 [WBH99] J135040.5-613509 * 13 50 40.5 -61 35 09           ~ 1 0
21 [WBH99] J135040.9-613505 * 13 50 40.9 -61 35 05           ~ 1 0
22 [WBH99] J135041.8-613510 * 13 50 41.8 -61 35 10           ~ 1 0
23 IRAS 13471-6120 cor 13 50 41.810 -61 35 10.67           ~ 65 0
24 GAL 309.92+00.48 HII 13 50 42.0 -61 35 09           ~ 34 0
25 [WBH99] J135042.4-613506 * 13 50 42.4 -61 35 06           ~ 1 0
26 TYC 9004-4280-1 * 13 50 42.9812760936 -61 34 56.014513716   13.25 11.81     ~ 2 0
27 2MASS J13504322-6135303 * 13 50 43.2242655912 -61 35 30.429892428           ~ 1 0
28 RAFGL 4972S cor 15 00 34.52760 -58 58 08.9076           ~ 51 1
29 [WBH99] J150038.1-585735 * 15 00 38.1 -58 57 35           ~ 1 0
30 [WBH99] J150039.6-585829 * 15 00 39.6 -58 58 29           ~ 1 0
31 2MASS J15005128-5858107 * 15 00 51.2696696712 -58 58 10.954259400           ~ 1 0
32 2MASS J15005183-5858511 * 15 00 51.83 -58 58 51.2           ~ 1 0
33 2MASS J15005510-5859060 * 15 00 55.1146411080 -58 59 06.182952072           ~ 1 0
34 OH 318.95-00.20 Y*O 15 00 55.35024 -58 58 53.2848           ~ 85 1
35 IRAS 15278-5620 HII 15 31 43.2 -56 30 25           ~ 35 1
36 [WBH99] J153143.3-563034 * 15 31 43.3 -56 30 34           ~ 1 0
37 [WBH99] J153144.3-563016 * 15 31 44.3 -56 30 16           ~ 1 0
38 [WBH99] J153145.7-563050 * 15 31 45.7 -56 30 50           ~ 1 0
39 [WBH99] J153146.1-563052 * 15 31 46.1 -56 30 52           ~ 1 0
40 [WBH99] J153148.0-563024 * 15 31 47.7979107696 -56 30 23.117449176           ~ 1 0
41 2MASS J15575455-5357581 * 15 57 54.5519627832 -53 57 58.122473040           ~ 1 0
42 2MASS J15575539-5358031 * 15 57 55.4002195272 -53 58 03.093285864           ~ 1 0
43 [WBH99] J155758.3-535742 * 15 57 58.3 -53 57 42           ~ 1 0
44 2MASS J15575935-5357573 Y*? 15 57 59.359 -53 57 57.34           ~ 3 0
45 OH 328.25-00.53 Mas 15 57 59.75 -53 58 00.4           ~ 69 0
46 IRAS 15541-5349 Y*? 15 57 59.827 -53 58 00.48           ~ 78 0
47 [WBH99] J161123.0-514158 * 16 11 23.0 -51 41 58           ~ 1 0
48 2MASS J16112425-5141547 Y*? 16 11 24.25536 -51 41 54.7008           ~ 2 0
49 [WBH99] J161124.4-514131 * 16 11 24.4 -51 41 31           ~ 1 0
50 SPICY 33707 Y*? 16 11 24.478 -51 41 47.67           ~ 2 0
51 [WBH99] J161126.0-514158 * 16 11 26.0 -51 41 58           ~ 1 0
52 GAL 331.28-00.19 HII 16 11 26.6 -51 41 57           ~ 56 0
53 [WBH99] J163415.6-480449 * 16 34 15.6 -48 04 49           ~ 1 0
54 [WBH99] J163416.6-480514 * 16 34 16.6 -48 05 14           ~ 1 0
55 [WHR97] 16306-4758 HII 16 34 20.2 -48 05 31           ~ 2 0
56 [WBH99] J163420.3-480528 * 16 34 20.3 -48 08 48           ~ 1 0
57 [WBH99] J163421.2-480515 * 16 34 21.2 -48 05 15           ~ 1 0
58 IRAS 16306-4758 * 16 34 21.58 -48 04 56.2           ~ 7 0
59 [WBH99] J163505.9-484615 * 16 35 05.9 -48 46 15           ~ 1 0
60 [WBH99] J163507.4-484617 * 16 35 07.4 -48 46 17           ~ 1 0
61 IRAS 16313-4840 HII 16 35 08.0 -48 46 16           ~ 26 0
62 [WBH99] J163509.0-484635 * 16 35 09.0 -48 46 35           ~ 1 0
63 [WBH99] J163510.4-484634 * 16 35 10.4 -48 46 34           ~ 1 0
64 [WBH99] J163511.3-484620 * 16 35 11.3 -48 46 20           ~ 1 0
65 [WBH99] J165012.5-444219 * 16 50 12.5 -44 42 19           ~ 1 0
66 [WBH99] J165013.3-444232 * 16 50 13.3 -44 42 32           ~ 1 0
67 2MASS J16501430-4442120 * 16 50 14.3036161104 -44 42 12.094244316           ~ 1 0
68 OH 340.78-00.10 Mas 16 50 14.84 -44 42 26.3           ~ 50 0
69 2MASS J16520463-4608450 * 16 52 04.6323821064 -46 08 45.124973376           ~ 1 0
70 OH 339.88-01.26 Y*O 16 52 04.6776 -46 08 34.404           ~ 119 1
71 [WBH99] J165205.3-460858 * 16 52 05.3 -46 08 58           ~ 1 0
72 2MASS J16520597-4608551 * 16 52 06.0660881376 -46 08 54.841804404           ~ 1 0
73 IRAS 16533-4009 HII 16 56 45.58 -40 14 32.4           ~ 49 0
74 [WBH99] J165646.4-401427 * 16 56 46.4 -40 14 27           ~ 1 0
75 [WBH99] J165646.8-401408 * 16 56 46.8 -40 14 08           ~ 1 0
76 [WBH99] J165647.6-401426 * 16 56 47.6 -40 14 26           ~ 1 0
77 2MASS J16564895-4014577 * 16 56 48.9519101016 -40 14 57.716649528           ~ 1 0
78 BAaDE ad3a-25795 Y*? 16 56 51.78 -40 14 49.9           ~ 3 0
79 2MASS J17040447-4219084 * 17 04 04.4801524680 -42 19 08.488655184           ~ 1 0
80 [WBH99] J170406.1-421858 * 17 04 06.1 -42 18 58           ~ 1 0
81 [WBH99] J170412.5-421956 * 17 04 12.5 -42 19 56           ~ 1 0
82 IRAS 17006-4215 HII 17 04 12.669 -42 19 53.13           ~ 23 1
83 IRAS 17031-4037 HII 17 06 36.2 -40 40 59           ~ 8 0
84 [WBH99] J170636.4-404024 * 17 06 36.4 -40 40 24           ~ 1 0
85 [WBH99] J170637.0-404116 * 17 06 37.0 -40 41 16           ~ 1 0
86 2MASS J17063779-4041235 * 17 06 37.80 -40 41 23.6           ~ 1 0
87 IRAS 17096-3856 HII 17 13 06.07 -38 59 53.7           ~ 11 0
88 [WBH99] J171308.5-390209 * 17 13 08.5 -39 02 09           ~ 1 0
89 [WBH99] J171308.9-390226 * 17 13 08.9 -39 02 26           ~ 1 0
90 2MASS J17205180-3547061 Y*O 17 20 51.807 -35 47 06.14           ~ 2 0
91 SSTU J172053.43-354717.8 Y*O 17 20 53.434 -35 47 17.86           ~ 5 0
92 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 244 1
93 SSTU J172053.47-354702.8 Y*O 17 20 53.471 -35 47 02.80           ~ 2 0
94 [WBH99] J172055.0-354645 * 17 20 55.0 -35 46 45           ~ 1 0
95 [WBH99] J172055.8-354711 * 17 20 55.8 -35 47 11           ~ 1 0
96 [WBH99] J172055.8-354650 * 17 20 55.8 -35 46 50           ~ 1 0
97 IRAS 17233-3606 HII 17 26 42.8 -36 09 17           ~ 98 0
98 [WBH99] J172642.8-360917 * 17 26 42.8 -36 09 17           ~ 1 0
99 [WBH99] J172643.6-360914 * 17 26 43.6 -36 09 14           ~ 1 0
100 IRAS 17577-2320 HII 18 00 49.6 -23 20 23           ~ 24 0
101 [WBH99] J180049.8-232032 * 18 00 49.8 -23 20 32           ~ 1 0
102 [WBH99] J180050.6-232050 * 18 00 50.6 -23 20 50           ~ 1 0
103 [WBH99] J180613.8-203151 * 18 06 13.8 -20 31 51           ~ 1 0
104 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 226 0
105 [WBH99] J180614.2-203215 * 18 06 14.2 -20 32 15           ~ 1 0
106 [WBH99] J180615.7-203212 * 18 06 15.7 -20 32 12           ~ 1 0

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