2013ApJ...764...34W

Query : 2013ApJ...764...34W

2013ApJ...764...34W - Astrophys. J., 764, 34 (2013/February-2)

The Green Bank Telescope H II Region Discovery Survey. IV. Helium and carbon recombination lines.

WENGER T.V., BANIA T.M., BALSER D.S. and ANDERSON L.D.

Abstract (from CDS):

The Green Bank Telescope H II Region Discovery Survey (GBT HRDS) found hundreds of previously unknown Galactic regions of massive star formation by detecting hydrogen radio recombination line (RRL) emission from candidate H II region targets. Since the HRDS nebulae lie at large distances from the Sun, they are located in previously unprobed zones of the Galactic disk. Here, we derive the properties of helium and carbon RRL emission from HRDS nebulae. Our target sample is the subset of the HRDS that has visible helium or carbon RRLs. This criterion gives a total of 84 velocity components (14% of the HRDS) with helium emission and 52 (9%) with carbon emission. For our highest quality sources, the average 4He+/H+ abundance ratio by number, < y + > , is 0.068±0.023(1σ). This is the same ratio as that measured for the sample of previously known Galactic H II regions. Nebulae without detected helium emission give robust y + upper limits. There are 5 RRL emission components with y + less than 0.04 and another 12 with upper limits below this value. These H II regions must have either a very low 4He abundance or contain a significant amount of neutral helium. The HRDS has 20 nebulae with carbon RRL emission but no helium emission at its sensitivity level. There is no correlation between the carbon RRL parameters and the 8 µm mid-infrared morphology of these nebulae.

Abstract Copyright: ∼

Journal keyword(s): ISM: abundances - H II regions - photon-dominated region, PDR - surveys - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/ApJ/764/34): table1.dat table2.dat table3.dat>

Simbad objects: 107

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Number of rows : 107
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 IC 1795 HII 02 25 43.5 +62 06 13           ~ 247 0
2 NGC 1491 HII 04 03 15.9 +51 18 54           ~ 117 0
3 IRAS 16573-4214 bub 17 00 55.4 -42 19 35           ~ 12 0
4 HRDS G344.991-00.266 HII 17 05 19.4 -41 31 11           ~ 2 0
5 HRDS G346.056-00.021 bub 17 07 40.5 -40 31 38           ~ 6 0
6 MSX6C G347.8707+00.0146 HII 17 13 08.640 -39 02 26.52           ~ 4 0
7 HRDS G350.004+00.438 HII 17 17 42.3 -37 03 36           ~ 3 1
8 HRDS G351.265+01.019 HII 17 18 57.0 -35 41 40           ~ 4 1
9 HRDS G348.533-00.972 HII 17 19 15.7 -39 04 27           ~ 2 0
10 HRDS G348.557-00.985 HII 17 19 23.3 -39 03 45           ~ 4 0
11 HRDS G350.330+00.157 HII 17 19 47.7 -36 57 17           ~ 3 1
12 HRDS G350.177+00.017 HII 17 19 56.0 -37 09 37           ~ 3 1
13 NGC 6334A HII 17 20 19.3 -35 54 55           ~ 123 0
14 HRDS G351.691+00.669 HII 17 21 33.9 -35 32 41           ~ 6 1
15 HRDS G352.313-00.440 HII 17 27 47.5 -35 39 15           ~ 2 0
16 HRDS G354.610+00.484 HII 17 30 13.5 -33 13 44           ~ 2 1
17 HRDS G354.717+00.293 HII 17 31 16.1 -33 14 43           ~ 2 1
18 IRAS 17302-3245 cor 17 33 28.8168 -32 47 58.668           ~ 23 0
19 HRDS G356.470-00.001 HII 17 36 57.4 -31 55 57           ~ 2 0
20 HRDS G358.633+00.062 HII 17 42 05.0 -30 04 04           ~ 3 1
21 HRDS G358.720+00.011 bub 17 42 27.2 -30 00 55           ~ 9 0
22 HRDS G358.616-00.076 HII 17 42 34.6 -30 09 25           ~ 5 0
23 HRDS G359.929+00.045 HII 17 45 16.7 -28 58 23           ~ 3 0
24 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
25 HRDS G000.382+00.017 HII 17 46 27.6 -28 36 04           ~ 2 0
26 HRDS G000.838+00.189 HII 17 46 52.1 -28 07 20           ~ 3 0
27 HRDS G000.729-00.103 HII 17 47 45.0 -28 22 00           ~ 3 0
28 HRDS G001.330+00.150 HII 17 48 10.2 -27 43 18           ~ 2 1
29 HRDS G001.324+00.104 HII 17 48 20.2 -27 45 02           ~ 2 0
30 HRDS G001.330+00.088 HII 17 48 24.9 -27 45 12           ~ 2 0
31 HRDS G002.404+00.068 HII 17 50 58.5 -26 50 32           ~ 2 0
32 HRDS G004.346+00.115 HII 17 55 11.2 -25 08 44           ~ 2 1
33 HRDS G004.527-00.136 HII 17 56 32.8 -25 06 58           ~ 2 1
34 HRDS G007.254-00.073 HII 18 02 15.2 -22 43 10           ~ 2 0
35 HRDS G008.432-00.276 HII 18 05 31.1 -21 47 39           ~ 2 0
36 HRDS G008.373-00.352 HII 18 05 40.5 -21 53 15           ~ 4 0
37 HRDS G010.473+00.028 HII 18 08 39.6 -19 51 54           ~ 2 0
38 HRDS G010.232-00.301 Rad 18 09 21.9 -20 14 00           ~ 3 2
39 HRDS G009.875-00.749 HII 18 10 18.1 -20 45 45           ~ 2 0
40 HRDS G010.638-00.434 bub 18 10 41.7 -19 56 31           ~ 5 0
41 HRDS G014.489+00.020 bub 18 16 46.1 -16 20 24           ~ 4 0
42 HRDS G014.478-00.006 bub 18 16 50.3 -16 21 41           ~ 5 0
43 HRDS G015.125-00.529 HII 18 20 02.9 -16 02 37           ~ 2 0
44 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
45 HRDS G016.361-00.209 HII 18 21 17.0 -14 47 48           ~ 4 0
46 HRDS G016.943-00.074 HII 18 21 56.0 -14 13 31           ~ 2 0
47 HRDS G018.077+00.071 HII 18 23 35.8 -13 09 25           ~ 4 0
48 HRDS G018.677-00.236 HII 18 25 51.8 -12 46 10           ~ 2 1
49 CORNISH G018.8338-00.3002 Y*O 18 26 23.62 -12 39 40.7           ~ 14 0
50 HRDS G018.937-00.434 HII 18 27 04.6 -12 37 52           ~ 3 0
51 HRDS G020.450+00.025 HII 18 28 17.5 -11 04 43           ~ 4 0
52 HRDS G020.533-00.187 HII 18 29 12.9 -11 06 13           ~ 4 0
53 HRDS G022.755-00.246 HII 18 33 36 -09 09.6           ~ 4 0
54 HRDS G022.739-00.303 HII 18 33 46.8 -09 12 06           ~ 3 0
55 HRDS G023.585+00.029 HII 18 34 09.9 -08 17 50           ~ 4 0
56 HRDS G024.500+00.487 bub 18 34 13.7 -07 16 41           ~ 5 0
57 HRDS G023.029-00.405 HII 18 34 42.0 -08 59 14           ~ 6 0
58 HRDS G023.265-00.301 HII 18 34 45.2 -08 44 01           ~ 3 0
59 HRDS G024.735+00.159 HII 18 35 50.2 -07 12 59           ~ 2 0
60 HRDS G024.739+00.083 bub 18 36 05.2 -07 14 56           ~ 9 0
61 HRDS G025.220+00.289 HII 18 36 16.3 -06 43 37           ~ 4 0
62 HRDS G025.150+00.092 HII 18 36 51 -06 52.8           ~ 3 0
63 HRDS G027.334+00.176 HII 18 40 34.5 -04 54 01           ~ 4 0
64 HRDS G028.696+00.048 HII 18 43 31.8 -03 44 49           ~ 2 0
65 GPSR 028.348-0.458 HII 18 44 22.475 -04 17 42.62           ~ 14 1
66 HRDS G030.249+00.243 bub 18 45 41.1 -02 16 36           ~ 7 0
67 HRDS G030.956+00.599 bub 18 45 43.6 -01 28 59           ~ 4 0
68 HRDS G030.022-00.044 bub 18 46 15.7 -02 36 25           ~ 7 0
69 HRDS G030.374+00.026 bub 18 46 40.3 -02 15 38           ~ 4 0
70 HRDS G030.797+00.165 HII 18 46 57.3 -01 49 29           ~ 2 0
71 IRAS 18443-0231 PN 18 47 01.08912 -02 27 55.1376           ~ 27 0
72 HRDS G030.644+00.053 HII 18 47 04.5 -02 00 44           ~ 2 0
73 HRDS G030.852+00.149 HII 18 47 06.7 -01 46 58           ~ 2 0
74 HRDS G030.838+00.114 HII 18 47 12.8 -01 48 40           ~ 2 0
75 HRDS G030.883+00.071 HII 18 47 26.9 -01 47 29           ~ 2 0
76 HRDS G031.157-00.148 HII 18 48 43.6 -01 38 50           ~ 2 1
77 HRDS G032.928+00.607 bub 18 49 16.3 +00 16 20           ~ 13 1
78 HRDS G032.058+00.077 bub 18 49 33.9 -00 44 35           ~ 13 0
79 HRDS G031.470-00.344 bub 18 50 00.5 -01 27 22           ~ 8 0
80 HRDS G032.272-00.226 HII 18 51 02.4 -00 41 25           ~ 16 1
81 HRDS G034.133+00.471 bub 18 51 57 +01 17.0           ~ 12 0
82 HRDS G034.172+00.175 HII 18 53 04.7 +01 11 02           ~ 6 0
83 HRDS G034.041+00.053 HII 18 53 16.5 +01 00 41           ~ 6 0
84 HRDS G034.031-00.059 HII 18 53 39.3 +00 57 03           ~ 3 0
85 HRDS G034.686+00.068 HII 18 54 23.9 +01 35 30           ~ 7 0
86 HRDS G035.541+00.005 HII 18 56 10.9 +02 19 28           ~ 4 1
87 MSX6C G038.8750+00.3088 Y*O 19 01 12.4 +05 25 43           ~ 22 1
88 HRDS G037.816-00.379 bub 19 01 42.3 +04 10 25           ~ 7 0
89 HRDS G037.868-00.601 HII 19 02 36.2 +04 07 02           ~ 5 1
90 [CPA2006] N75 bub 19 03 47.1 +05 09 27           ~ 40 0
91 HRDS G039.873-00.177 bub 19 04 46.3 +06 05 43           ~ 8 0
92 CORNISH G039.7277-00.3973 bub 19 05 17.9427 +05 51 46.500           ~ 10 0
93 IRAS 19029+0556 Y*O 19 05 24.11520 +06 01 25.9068           ~ 43 1
94 HRDS G041.515-00.139 bub 19 07 40.0 +07 34 16           ~ 8 0
95 HRDS G043.818+00.393 HII 19 10 04.2 +09 51 28           ~ 5 0
96 W 49a SFR 19 10 15.7 +09 06 05           ~ 325 2
97 HRDS G042.209-00.587 HII 19 10 34.9 +07 58 40           ~ 4 0
98 HRDS G044.501+00.335 bub 19 11 33.5 +10 26 22           ~ 11 0
99 HRDS G045.542-00.006 HII 19 14 45.5 +11 12 05           ~ 4 0
100 HRDS G048.551-00.001 HII 19 20 30.0 +13 51 49           ~ 6 0
101 [JSA2009] G49.912 VLA 1 HII 19 21 39.0 +15 09 45           ~ 6 0
102 HRDS G049.163-00.066 HII 19 21 56.6 +14 21 40           ~ 5 0
103 HRDS G052.098+01.042 HII 19 23 37.19 +17 29 01.2           ~ 7 0
104 HRDS G049.399-00.489 HII 19 23 55.56 +14 22 57.0           ~ 8 0
105 HRDS G056.252-00.160 HII 19 36 32.5 +20 33 26           ~ 8 1
106 NAME K 3-50A HII 20 01 45.6 +33 32 42           ~ 85 0
107 HD 192163 WR* 20 12 06.5418877464 +38 21 17.784181008 7.12 7.49 7.50     WN6(h)-s 715 1

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