2001MNRAS.326...36W

Query : 2001MNRAS.326...36W

2001MNRAS.326...36W - Mon. Not. R. Astron. Soc., 326, 36-56 (2001/September-1)

Mid-infrared observations of methanol maser sites and ultracompact HII regions: signposts of high-mass star formation.

WALSH A.J., BERTOLDI F., BURTON M.G. and NIKOLA T.

Abstract (from CDS):

N-band (10.5µm) and/or Q-band (20.0µm) images taken with MANIAC on the ESO/MPI 2.2-m telescope are presented for 31 methanol maser sites and 19 ultracompact (UC) Hii regions. Most of the maser sites and UC Hii regions are coincident with mid-infrared (MIR) sources to within the positional uncertainties of ∼3arcsec, consistent with the maser emission being powered by the MIR source. The IRAS source positions, however, do not always coincide with the MIR sources.

Based on an average infrared spectral energy distribution, we deduce that the MIR objects are luminous enough that they should also produce a strong ionizing radiation. Some sources are consistent with stars of later spectral type, but not all can be. A number of maser sites show no detectable radio continuum emission associated with MIR emission, despite a powering source luminous enough potentially to produce an UC Hii region. Since no signs of an UC Hii region are detected here, these maser sites might be produced during a very early stage of stellar evolution.

We present objects that show evidence of outflow activity stemming from a maser site, exhibiting CO and/or CS line profiles indicative of outflows coincident with the MIR source. These cases are promising examples of maser sites signposting the earliest stages of high-mass star formation.


Abstract Copyright: The Royal Astronomical Society

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

Nomenclature: Table 1: [WBB2001] NN (Nos 1-55).

Simbad objects: 100

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Number of rows : 100
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 [BCB89] IRS 2 Y*O 05 41 45.81 -01 54 29.8           B 101 0
2 IRAS 05393-0156 HII 05 41 45.9 -01 54 32           ~ 37 0
3 * alf Ori s*r 05 55 10.30536 +07 24 25.4304 4.38 2.27 0.42 -1.17 -2.45 M1-M2Ia-Iab 1671 0
4 [WBB2001] 4 IR 06 07 45.6 -06 22 51           ~ 1 0
5 NAME Mon R2 IRS 2 * 06 07 45.83 -06 22 53.5           B0 111 0
6 [WBB2001] 3 IR 06 07 46.1 -06 23 07           ~ 1 0
7 NAME Mon R2 IRS 1 cor 06 07 46.20 -06 23 09.5           B0 64 0
8 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 742 2
9 NAME Mon R2 IRS 3 Y*O 06 07 47.8 -06 22 55           ~ 142 0
10 [WBB2001] 2 IR 06 07 47.8 -06 22 55           ~ 1 0
11 * alf Car * 06 23 57.10988 -52 41 44.3810 -0.49 -0.59 -0.74 -0.96 -1.13 A9II 447 1
12 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A0mA1Va 1531 0
13 RCW 7 HII 07 32 09.59 -16 58 12.3           ~ 56 0
14 IRAS 07299-1651 Y*O 07 32 09.7800 -16 58 12.800           ~ 79 0
15 [WBB2001] 5 IR 07 32 09.8 -16 58 16           ~ 1 0
16 HH 132 HH 08 35 29.5 -40 38 54           ~ 5 0
17 IRAS 08337-4028 MIR 08 35 31.00392 -40 38 24.8604           ~ 20 0
18 [WBB2001] 7 Y*? 08 35 32.8152832704 -40 38 36.084299532           ~ 3 0
19 PN K 2-15 HII 08 48 39.0553841664 -42 53 54.005736984   12.86 12.01 11.72 10.79 B0V 67 2
20 [WBB2001] 10 IR 08 48 47.2 -42 54 34           ~ 1 0
21 [WBB2001] 9 IR 08 48 47.5 -42 54 31           ~ 1 0
22 Cl* Trumpler 10 STOCK 732 * 08 48 48.1375686912 -42 54 20.898623484   12.33 12.52 12.52 11.88 ~ 4 0
23 GAL 268.4-00.9 HII 09 01 54.3 -47 43 59           ~ 52 1
24 2MASS J09015447-4744112 Y*? 09 01 54.47 -47 44 11.2           ~ 5 0
25 2MASS J09015507-4743503 Y*? 09 01 55.07472 -47 43 50.3040           ~ 3 0
26 IRAS 09015-4843 HII 09 03 13.5 -48 55 21           ~ 13 0
27 [WBB2001] 14 IR 09 03 14.1 -48 55 30           ~ 1 0
28 [WBB2001] 13 IR 09 03 14.9 -48 55 11           ~ 1 0
29 * lam Vel s*r 09 07 59.75787 -43 25 57.3273 5.67 3.86 2.21 0.97 0.03 K4Ib 218 0
30 * alf Hya * 09 27 35.24270 -08 39 30.9583 5.14 3.42 1.97 0.93 0.16 K3IIIa 434 1
31 IRAS 10460-5811 Y*O 10 48 04.5510777096 -58 27 01.610150076           ~ 31 1
32 [ABB2014] WISE G287.374+00.646 HII 10 48 06 -58 27.0           ~ 16 0
33 [WBB2001] 18 IR 11 11 49.5 -61 18 52           ~ 1 0
34 NGC 3576 HII 11 11 49.8 -61 18 14           ~ 237 2
35 [WBB2001] 17 IR 11 11 51.3 -61 18 47           ~ 1 0
36 [WBB2001] 16 IR 11 11 52.9 -61 18 18           ~ 1 0
37 NAME NGC 3576 IRS 1 HII 11 11 54.8 -61 18 26           ~ 31 1
38 NGC 3603 OpC 11 15 10.8 -61 15 32           ~ 1068 1
39 PMN J1132-6212 Rad 11 32 02.4 -62 12 51           ~ 2 0
40 [WBB2001] 19 IR 11 32 05.6 -62 12 25           ~ 1 0
41 IRAS 11298-6155 HII 11 32 06.1 -62 12 22           ~ 14 0
42 IRAS 12091-6129 of? 12 11 47.65 -61 46 20.9           ~ 26 0
43 * gam Cru PM* 12 31 09.95961 -57 06 47.5684 5.01 3.23 1.64 -0.02 -1.44 M3.5III 278 1
44 HD 108925 * 12 31 16.7131002672 -57 04 52.799316420   6.58 6.45     A3IVn 41 0
45 [WBB2001] 21 IR 12 34 52.1 -61 39 30           ~ 1 0
46 [WBB2001] 22 IR 12 34 53.5 -61 39 39           ~ 1 0
47 GUM 43 HII 12 34 54.4 -61 39 25           ~ 56 1
48 [WBB2001] 23 IR 12 34 54.8 -61 39 42           ~ 1 0
49 PMN J1243-6255 Rad 12 43 30.7 -62 55 10           ~ 2 0
50 [WBB2001] 24 IR 12 43 31.7 -62 55 07           ~ 1 0
51 IRAS 12405-6238 HII 12 43 31.752 -62 55 09.84           ~ 24 0
52 2MASS J12433190-6255029 NIR 12 43 31.90 -62 55 03.0           ~ 1 0
53 [WBB2001] 25 IR 12 43 32.3 -62 55 08           ~ 1 0
54 GRS G305.40 +00.20 HII 13 10 19 -62 38.5           ~ 33 0
55 2MASS J13110860-6234416 * 13 11 08.5959377040 -62 34 41.557664172           ~ 1 0
56 [WBB2001] 27 IR 13 11 10.5 -62 34 39           ~ 1 0
57 GAL 305.20+00.21 HII 13 11 11.7 -62 34 44           ~ 31 0
58 [LMR2007] MM 4 * 13 11 13.8 -62 34 39           ~ 2 0
59 [WBB2001] 32 IR 13 11 14.4 -62 45 08           ~ 1 0
60 PMN J1311-6245 HII 13 11 15.4 -62 45 08           ~ 7 0
61 IRAS 13080-6229 HII 13 11 17.9 -62 45 55           ~ 22 0
62 [WBB2001] 30 IR 13 11 18.6 -62 45 55           ~ 1 0
63 [WBB2001] 31 IR 13 11 18.9 -62 46 37           ~ 1 0
64 IRAS 13471-6120 cor 13 50 41.832 -61 35 09.96           ~ 53 0
65 2MASS J13504184-6135113 NIR 13 50 41.845 -61 35 11.37           ~ 1 0
66 GAL 309.92+00.48 HII 13 50 42.0 -61 35 09           ~ 32 0
67 2MASS J13504233-6135078 NIR 13 50 42.336 -61 35 07.89           ~ 1 0
68 [WBB2001] 37 IR 14 19 35.2 -60 51 54           ~ 1 0
69 WISE J141935.40-605154.4 MIR 14 19 35.40024 -60 51 54.4860           ~ 1 0
70 IRAS 14159-6038 HII 14 19 35.5 -60 51 53           ~ 16 0
71 PMN J1419-6052 Rad 14 19 36.6 -60 52 27           ~ 2 0
72 OH 313.47+00.19 Y*? 14 19 40.94 -60 51 47.3           ~ 18 0
73 IRAS 14212-6131 HII 14 25 01.51896 -61 44 57.5916           ~ 20 0
74 [WBB2001] 39 IR 14 25 01.6 -61 44 58           ~ 1 0
75 [WBB2001] 38 IR 14 25 04.7 -61 44 51           ~ 1 0
76 [WBB2001] 41 IR 14 45 22.5 -59 49 38           ~ 2 0
77 [WBB2001] 40 IR 14 45 24.1 -59 48 58           ~ 1 0
78 IRAS 14416-5937 HII 14 45 28.6 -59 49 59           ~ 25 1
79 RAFGL 4972S cor 15 00 34.52760 -58 58 08.9076           ~ 49 1
80 OH 318.95-00.20 Y*O 15 00 55.35024 -58 58 53.2848           ~ 82 1
81 * sig Lib Mi* 15 04 04.2148093680 -25 16 55.090486596 6.86 4.91 3.21 1.60 0.33 M2.5III 186 0
82 IRAS 15278-5620 HII 15 31 43.2 -56 30 25           ~ 34 1
83 [WBB2001] 45 IR 15 31 45.6 -56 30 50           ~ 1 0
84 [WBB2001] 44 IR 15 31 45.9 -56 30 52           ~ 1 0
85 IRAS 15520-5234 HII 15 55 48.336 -52 43 10.20           ~ 46 1
86 [WBB2001] 46 IR 15 55 48.4 -52 43 06           ~ 1 0
87 2MASS J15554848-5243018 * 15 55 48.4694142816 -52 43 01.951841496           ~ 1 0
88 [WBB2001] 48 IR 15 55 48.6 -52 43 08           ~ 1 0
89 [WBB2001] 51 IR 15 57 58.3 -53 59 23           ~ 1 0
90 [WBB2001] 50 * 15 57 59.359 -53 57 57.34           ~ 2 0
91 IRAS 15541-5349 HII 15 57 59.70168 -53 58 00.6204           ~ 68 0
92 OH 328.25-00.53 Mas 15 57 59.75 -53 58 00.4           ~ 64 0
93 PMN J1611-5142 Rad 16 11 24.4 -51 42 19           ~ 2 0
94 [WBB2001] 52 IR 16 11 26.5 -51 41 57           ~ 1 0
95 GAL 331.28-00.19 HII 16 11 26.6 -51 41 57           ~ 42 0
96 * alf Sco s*r 16 29 24.45970 -26 25 55.2094 4.08 2.75 0.91 -0.64 -1.87 M1.5Iab+B2Vn 746 0
97 IRAS 16533-4009 HII 16 56 45.58 -40 14 32.4           ~ 47 0
98 [WBB2001] 55 IR 16 56 45.9 -40 14 29           ~ 1 0
99 [WBB2001] 54 IR 16 56 46.8 -40 14 07           ~ 1 0
100 AKARI-IRC-V1 J1656476-401426 MIR 16 56 47.713 -40 14 25.63           ~ 1 0

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