2011ApJ...738...27B

Query : 2011ApJ...738...27B

2011ApJ...738...27B - Astrophys. J., 738, 27 (2011/September-1)

H II region metallicity distribution in the Milky Way disk.

BALSER D.S., ROOD R.T., BANIA T.M. and ANDERSON L.D.

Abstract (from CDS):

The distribution of metals in the Galaxy provides important information about galaxy formation and evolution. H II regions are the most luminous objects in the Milky Way at mid-infrared to radio wavelengths and can be seen across the entire Galactic disk. We used the National Radio Astronomy Observatory (NRAO) Green Bank Telescope to measure radio recombination line and continuum emission in 81 Galactic H II regions. We calculated LTE electron temperatures using these data. In thermal equilibrium metal abundances are expected to set the nebular electron temperature with high abundances producing low temperatures. Our H II region distribution covers a large range of Galactocentric radius (5-22 kpc) and samples the Galactic azimuth range 330°-60°. Using our highest quality data (72 objects) we derived an O/H Galactocentric radial gradient of -0.0383±0.0074 dex/kpc. Combining these data with a similar survey made with the NRAO 140 Foot telescope we get a radial gradient of -0.0446±0.0049 dex/kpc for this larger sample of 133 nebulae. The data are well fit by a linear model and no discontinuities are detected. Dividing our sample into three Galactic azimuth regions produced significantly different radial gradients that range from -0.03 to -0.07 dex/kpc. These inhomogeneities suggest that metals are not well mixed at a given radius. We stress the importance of homogeneous samples to reduce the confusion of comparing data sets with different systematics. Galactic chemical evolution models typically derive chemical evolution along only the radial dimension with time. Future models should consider azimuthal evolution as well.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: abundances - H II regions - radio lines: ISM

VizieR on-line data: <Available at CDS (J/ApJ/738/27): table1.dat table2.dat table3.dat>

Simbad objects: 84

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Number of rows : 84
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 GAL 124.64+02.54 HII 01 07 50.70 +65 21 21.4           ~ 52 0
2 SH 2-186 HII 01 08 50.51 +63 07 34.2           ~ 45 1
3 GAL 128.78+02.01 IR 01 45 39.6 +64 16 01           ~ 3 0
4 IRAS 02044+6031 Y*O 02 08 05.0355540072 +60 46 00.603102324           ~ 70 1
5 NAME W 3 North HII 02 26 51.14 +62 15 47.2           ~ 93 0
6 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
7 [L89b] 136.913+01.033 HII 02 49 34.6 +60 39 26           ~ 6 0
8 SH 2-201 HII 03 03 17.9 +60 27 52           ~ 118 0
9 NGC 1491 HII 04 03 15.9 +51 18 54           ~ 117 0
10 SH 2-209 HII 04 11 06.7 +51 09 44           ~ 105 0
11 SH 2-209 N HII 04 11 06.82 +51 11 19.7           ~ 4 0
12 LBN 154.69+02.43 HII 04 36 57 +50 52.6           ~ 42 0
13 SH 2-212 HII 04 40 36.52 +50 27 44.3           ~ 102 2
14 LBN 784 HII 05 13 25.5 +37 27 01           ~ 83 0
15 NGC 1931 OpC 05 31 23 +34 14.0     10.1     ~ 136 0
16 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
17 SH 2-235 HII 05 41.1 +35 50           ~ 236 0
18 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
19 Cl Berkeley 21 OpC 05 51 44.7 +21 48 36   12.26 11.1     ~ 130 0
20 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
21 SH 2-257 HII 06 12 43.57 +17 59 33.1           ~ 135 1
22 LBN 196.49-01.60 HII 06 14 38.29 +13 49 41.0           ~ 169 1
23 GAL 201.6+01.6 HII 06 36 36.3 +10 46 30           ~ 27 0
24 Min 2-62 HII 06 43 48.4473235800 -01 08 19.726436292           ~ 40 2
25 LBN 1020 HII 06 55 21.9 -08 00 25           ~ 11 0
26 LBN 1039 HII 07 05 13 -12 19.0           ~ 48 0
27 IC 466 HII 07 08 37 -04 18.8           ~ 49 0
28 RAFGL 5223 Or* 07 08 38.7906809616 -04 19 04.847636136 12.48 12.71 12.06     B0 46 0
29 SH 2-301 HII 07 09 54.3 -18 29 53           ~ 51 0
30 NGC 2359 HII 07 18 30.000 -13 13 36.00           ~ 170 0
31 SH 2-305 HII 07 30 04.1 -18 32 13           ~ 55 0
32 NGC 2467 OpC 07 52 18 -26 25.7           ~ 190 1
33 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
34 F3R 261 HII 18 02 13.112 -22 27 50.56           ~ 49 1
35 LBN 028.77+03.43 HII 18 31 26.5 -02 04 22           ~ 255 2
36 W 43 SFR 18 47 32 -01 56.5           ~ 604 0
37 [CKW87] 184756.9+000519 HII 18 50 30.5 +00 08 53           ~ 2 0
38 NRAO 584 Rad 18 53 20 +01 14.9           ~ 15 0
39 LBN 040.46+02.46 HII 18 56.4 +07 48   12.16 11.66     ~ 22 0
40 MSX6C G038.8750+00.3088 Y*O 19 01 12.4 +05 25 43           ~ 22 1
41 SNR G035.2-01.8 SNR 19 01.6 +01 14           ~ 158 0
42 [WBH2005] G039.729-0.397 HII 19 05 18.0 +05 51 50           ~ 2 1
43 CORNISH G045.4545+00.0591 HII 19 14 21.31 +11 09 11.7           ~ 157 1
44 GAL 046.49-00.25 bub 19 17 26.4 +11 55 54           ~ 20 0
45 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
46 SH 2-83 HII 19 24 30.01 +20 47 34.5           ~ 45 1
47 [KB94] 70 HII 19 27 32.1 +17 43 28           ~ 5 0
48 [KB94] 76 HII 19 42 33.7 +23 49 54           ~ 5 0
49 SH 2-87 bub 19 46 20.69 +24 35 15.4           ~ 161 2
50 LBN 061.50+00.29 HII 19 46 45.7 +25 12 56           ~ 69 0
51 LBN 063.10+00.46 HII 19 49 11.7 +26 51 36   14.60 13.63     ~ 55 0
52 LBN 064.20-00.44 HII 19 55 02 +27 12.8   15.04 13.64     ~ 30 0
53 LBN 068.07+00.92 HII 19 59 01 +31 22.5   14.25 13.53     ~ 27 0
54 [KC97c] G069.9+01.5 HII 20 01 12.7 +33 12 13           ~ 3 0
55 W 58a HII 20 01 45.8 +33 32 43           ~ 294 4
56 LBN 077.61+01.59 HII 20 20 39.3 +39 37 52           ~ 80 0
57 SH 2-105 HII 20 21 38.2 +37 31 11           ~ 21 0
58 [KC97c] G075.8+00.3 HII 20 21 41.0 +37 25 56           ~ 8 0
59 [KC97c] G079.4+02.4 HII 20 23 40.7 +41 36 43           ~ 4 0
60 [KC97c] G076.2-00.3 HII 20 25 22.5 +37 23 21           ~ 4 0
61 [KC97c] G078.0+00.6 HII 20 27 14.7 +39 26 08           ~ 4 0
62 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 453 1
63 DR 7 HII 20 28 09.5 +40 51 43           ~ 49 0
64 GAL 077.96-00.01 HII 20 29 36.72 +39 01 21.9           ~ 42 1
65 [KC97c] G080.0+00.9 HII 20 32 04.2 +41 08 45           ~ 5 0
66 SH 2-112 HII 20 33 49 +45 38.0           ~ 35 0
67 [KC97c] G080.3+00.7 HII 20 33 55.3 +41 22 21           ~ 4 0
68 [KC97c] G081.3+01.1 HII 20 35 06.2 +42 20 24           ~ 7 0
69 [KC97c] G080.9+00.4 HII 20 36 57.7 +41 36 47           ~ 4 0
70 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
71 [UHP2009] VLA G080.9379-00.1276 HII 20 39 25.9 +41 19 59           ~ 3 1
72 [ABB2014] G082.566+00.362 HII 20 42 32.5 +42 56 46           ~ 8 0
73 [ABB2014] WISE G085.241+00.021 HII 20 53 36.8 +44 46 25           ~ 6 0
74 LBN 096.23+02.55 HII 21 28 42 +54 37.0           ~ 54 0
75 IRAS 21270+5423 IR 21 28 42.0 +54 36 51           ~ 20 1
76 SH 2-128 HII 21 32 09.9 +55 52 53           ~ 173 1
77 BG 2247+59 LP? 22 49 29.0034646608 +59 54 56.182749876           ~ 111 1
78 SH 2-147 HII 22 55.7 +58 28           ~ 30 1
79 SH 2-152 HII 22 58 40.8107767416 +58 46 59.226036024           ~ 147 1
80 IC 1470 HII 23 05 09.9 +60 14 31   11.5       ~ 180 2
81 NGC 7538 OpC 23 13 37 +61 30.0           ~ 920 1
82 SH 2-159 Y*O 23 15 31.2384366062 +61 07 10.181362705           ~ 188 1
83 NGC 7635 HII 23 20 48.3 +61 12 06           ~ 179 2
84 LBN 115.71-01.61 HII 23 52 56.5 +60 29 04           ~ 41 0

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