2012MNRAS.421.3418H

Query : 2012MNRAS.421.3418H

2012MNRAS.421.3418H - Mon. Not. R. Astron. Soc., 421, 3418-3430 (2012/April-3)

The G305 star-forming complex: a wide-area radio survey of ultracompact H II regions.

HINDSON L., THOMPSON M.A., URQUHART J.S., FAIMALI A., CLARK J.S. and DAVIES B.

Abstract (from CDS):

We present wide-area radio continuum 5.5 and 8.8 GHz (5.5 and 3.4 cm) Australia Telescope Compact Array observations of the complex and rich massive star-forming region G305. The aim of this study is to perform an un-targeted survey of the region in search of the compact radio emission associated with ultracompact (UC) H II regions. Observations presented here encompass the entire complex and have a maximum resolution of ∼ 1.5 {x} 1.4 arcsec and sensitivity of ∼ 0.07 mJy/beam. By applying a data reduction method that emphasizes small-scale structure, we are able to detect 71 compact radio sources distributed throughout the observed field. To explore the nature of these compact radio sources we compare to mid-infrared data and in this way identify 56 background sources, eight stellar radio sources, a single bright-rimmed cloud and six candidate UC H II regions. The physical properties of these candidate UC H II regions are determined and reveal that five candidates have peak properties consistent with known UC H II regions with source radii ranging from 0.04 to 0.1 pc, emission measures from 2.56 to 10.3 {x} 10–6 pc/cm6 and electron densities of 0.34–1.03 {x} 104/cm3. We comment on these sites of recent massive star formation within G305 and by comparing to other star formation tracers (masers, NH3 and young stellar objects) build a picture of the star formation history of the region. Using these results we estimate a lower limit to the star formation rate for the region of ∼ 0.003 M☉/yr.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): stars: formation - ISM: clouds - H {sc ii} regions - radio continuum: galaxies - radio continuum: ISM

Nomenclature: Table 2: [HTU2012] NN (Nos 0-70).

Simbad objects: 83

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Number of rows : 83
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 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
2 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 323 0
3 [HTU2012] 23 Rad 13 07 36 -62 50.2           ~ 1 0
4 [HTU2012] 22 Rad 13 07 40 -62 50.4           ~ 1 0
5 [HTU2012] 21 Rad 13 07 42 -62 49.3           ~ 1 0
6 [HTU2012] 51 Rad 13 07 42 -62 35.4           ~ 1 0
7 [HTU2012] 57 Rad 13 07 50 -62 34.6           ~ 1 0
8 [HTU2012] 55 Rad 13 07 58 -62 18.5           ~ 1 0
9 [HTU2012] 50 Rad 13 08 03 -62 57.8           ~ 1 0
10 [HTU2012] 42 Rad 13 08 08 -62 43.5           ~ 1 0
11 [HTU2012] 43 Rad 13 08 18 -62 45.5           ~ 1 0
12 [HTU2012] 49 Rad 13 08 19 -63 01.5           ~ 1 0
13 [HTU2012] 24 Rad 13 08 34 -62 40.7           ~ 1 0
14 [HTU2012] 26 HII 13 08 37 -62 15.2           ~ 1 0
15 [HTU2012] 25 Rad 13 08 49 -62 23.6           ~ 1 0
16 [HTU2012] 66 Rad 13 09 58 -62 23.9           ~ 1 0
17 [HTU2012] 64 Rad 13 10 02 -62 54.9           ~ 1 0
18 [HTU2012] 41 Rad 13 10 23 -62 17.3           ~ 1 0
19 [HTU2012] 63 * 13 10 24 -62 53.2           ~ 1 0
20 [HTU2012] 11 * 13 10 43 -62 41.5           ~ 1 0
21 [HTU2012] 13 Rad 13 10 56 -62 26.4           ~ 1 0
22 [HTU2012] 12 Rad 13 11 00 -62 25.6           ~ 1 0
23 [HTU2012] 54 Rad 13 11 00 -62 20.3           ~ 1 0
24 [HTU2012] 14 Rad 13 11 01 -62 19.2           ~ 1 0
25 [HTU2012] 37 HII 13 11 17 -62 45.9           ~ 1 0
26 [HTU2012] 48 Rad 13 11 28 -63 03.3           ~ 1 0
27 [HTU2012] 10 Cld 13 11 32 -62 33.5           ~ 1 0
28 [LCL2005b] G305.3+0.2 A2 * 13 11 33.88 -62 33 27.1           B0V-B1V 5 0
29 GAL 305.20+00.2 bub 13 11 35.1 -62 33 26           ~ 39 0
30 [HTU2012] 69 Rad 13 11 47 -62 24.8           ~ 1 0
31 [HTU2012] 4 Rad 13 12 07 -62 39.9           ~ 1 0
32 [HTU2012] 56 * 13 12 09 -62 43.5           ~ 1 0
33 [HTU2012] 58 Rad 13 12 09 -62 52.2           ~ 1 0
34 WR 48-6 WR* 13 12 09.0613442832 -62 43 26.718131640           WN8-9 11 0
35 WR 48-10 WR* 13 12 24.9913507440 -62 42 00.201886956     17.40     WNLh 11 0
36 [HTU2012] 59 * 13 12 25 -62 42.0           ~ 1 0
37 WR 48-9 WR* 13 12 28.5638209632 -62 41 43.769380128     14.96     WNLh 17 0
38 [HTU2012] 2 * 13 12 29 -62 41.7           ~ 1 0
39 Cl Danks 1 OpC 13 12 29.0 -62 41 56           ~ 80 0
40 [HTU2012] 8 HII 13 12 36 -62 37.3           ~ 2 0
41 [HTU2012] 9 HII 13 12 36 -62 33.5           ~ 1 0
42 [HTU2012] 3 * 13 12 39 -62 42.9           ~ 1 0
43 WR 48a WR* 13 12 39.6052790136 -62 42 55.939362876       16.081   WC6 106 0
44 [HTU2012] 38 Rad 13 12 43 -62 15.9           ~ 1 0
45 [HTU2012] 0 Rad 13 12 44 -62 39.5           ~ 1 0
46 [HTU2012] 44 Rad 13 12 46 -62 32.1           ~ 1 0
47 [HTU2012] 39 Rad 13 12 47 -62 15.3           ~ 1 0
48 [HTU2012] 1 Rad 13 12 49 -62 39.1           ~ 1 0
49 Cl Danks 2 OpC 13 12 53.3 -62 40 52           ~ 73 0
50 NAME G305 Complex SFR 13 13 -62.7           ~ 72 0
51 [HTU2012] 62 Rad 13 13 01 -62 55.0           ~ 1 0
52 [HTU2012] 6 Rad 13 13 13 -62 39.2           ~ 1 0
53 [HTU2012] 5 Rad 13 13 19 -62 40.9           ~ 1 0
54 [HTU2012] 47 Rad 13 13 20 -63 03.2           ~ 1 0
55 [HTU2012] 68 Rad 13 13 20 -62 23.4           ~ 1 0
56 [HTU2012] 35 Rad 13 13 25 -62 22.9           ~ 1 0
57 [HTU2012] 16 Rad 13 13 50 -62 31.5           ~ 1 0
58 [HTU2012] 61 Rad 13 13 52 -62 42.6           ~ 1 0
59 [HTU2012] 36 Rad 13 13 56 -62 52.2           ~ 1 0
60 2MASS J13140304-6241406 LP? 13 14 03.0499333612 -62 41 40.673048449           ~ 2 0
61 [HTU2012] 65 Rad 13 14 04 -62 17.8           ~ 1 0
62 [HTU2012] 19 Rad 13 14 07 -62 45.8           ~ 1 0
63 [HTU2012] 7 Rad 13 14 10 -62 37.4           ~ 1 0
64 [HTU2012] 18 Rad 13 14 13 -62 44.5           ~ 1 0
65 [HTU2012] 15 Rad 13 14 17 -62 32.1           ~ 1 0
66 [HTU2012] 45 Rad 13 14 20 -62 29.4           ~ 1 0
67 [HTU2012] 20 HII 13 14 23 -62 46.0           ~ 1 0
68 [HTU2013] G305.561+0.013 HII 13 14 26 -62 44.5           ~ 3 0
69 [HTU2012] 70 Rad 13 14 55 -62 57.7           ~ 1 0
70 [HTU2012] 52 Rad 13 15 02 -62 19.1           ~ 1 0
71 [HTU2012] 67 * 13 15 03 -62 44.9           ~ 1 0
72 [HTU2012] 27 Rad 13 15 18 -62 14.5           ~ 1 0
73 [HTU2012] 31 Rad 13 15 27 -62 53.7           ~ 1 0
74 [HTU2012] 28 Rad 13 15 27 -62 43.5           ~ 1 0
75 [HTU2012] 53 Rad 13 15 29 -62 23.3           ~ 1 0
76 [HTU2012] 33 Rad 13 15 34 -62 56.1           ~ 1 0
77 [HTU2012] 34 Rad 13 15 35 -62 58.0           ~ 1 0
78 [HTU2012] 30 Rad 13 15 45 -62 52.6           ~ 1 0
79 [HTU2012] 40 Rad 13 15 46 -62 19.7           ~ 1 0
80 [HTU2012] 29 Rad 13 15 51 -62 50.5           ~ 1 0
81 [HTU2012] 46 Rad 13 15 52 -63 03.8           ~ 1 0
82 [HTU2012] 32 Rad 13 16 03 -62 54.8           ~ 1 0
83 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0

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