2003A&A...407..957M

Query : 2003A&A...407..957M

2003A&A...407..957M - Astronomy and Astrophysics, volume 407957-985 (2003/9-1)

A radio continuum and infrared study of Galactic H II regions.

MARTIN-HERNANDEZ N.L., VAN DER HULST J.M. and TIELENS A.G.G.M.

Abstract (from CDS):

We present observations of the 4.8 and 8.6-GHz continuum emission towards 11 southern HII regions made with the Australian Telescope Compact Array. The observed objects were selected from the Infrared Space Observatory (ISO) spectral catalogue of compact HII regions (Peeters et al., 2002A&A...381..571P). The morphologies observed for practically all the sources are consistent with them being ionized by a cluster of stars, rather than by a single star. The linear diameters of the regions range from 0.03pc to 3pc, the electron densities from 300 to 2.5x104cm–3, and the Lyman continuum photon flux from 1047 to 1050s–1. We confirm the existence of a relation between the density and size of HII regions which can be fit by a power law shallower than that predicted by the classic Stroemgren theory. The radio observations provide, in addition, information about the distribution of the ionized gas within the ISO apertures. As a result of the combined radio and infrared study, estimates of the extinction in the infrared and the metal content of the nebular gas were calculated. In this analysis, we also included several (ultra)compact HII regions previously observed by the Very Large Array. Values for extinction in the K-band between ∼0 and 6mag are found. The elemental abundances of nitrogen, neon, argon and sulphur were found to decrease with Galactocentric distance. Finally, the degree of ionization of the nebulae is confirmed to be correlated with the metal content.

Abstract Copyright: ∼

Journal keyword(s): instrumentation: interferometers - ISM: HII regions - radio continuum: ISM - ISM: abundances - ISM: dust, extinction

Nomenclature: Tables 2, 4: [MVT2003] IRAS HHMMm+DDMM AN 22+2, [MVT2003] DR 21 A (Nos A-B). Text: [MVT2003] IRAS 15384-5348 Knot N (Nos 1-5).

CDS comments: Table 9: IRAS 02219+6125 is a misprint for IRAS 02219+6152.

Simbad objects: 59

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Number of rows : 59
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 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
3 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 367 0
4 [BNM96] 289.880-0.799 HII 11 00 59.4892543320 -60 50 22.768640052           ~ 36 0
5 GRS G291.86 -00.68 HII 11 16 33.8 -61 29 59           ~ 21 0
6 [MVT2003] IRAS 12063-6259 B1 Rad 12 09 00.99 -63 15 59.3           ~ 1 0
7 [MVT2003] IRAS 12063-6259 A Rad 12 09 01 -15 52.9           ~ 1 0
8 [MVT2003] IRAS 12063-6259 B Rad 12 09 01.01 -63 16 00.8           ~ 1 0
9 [MVT2003] IRAS 12063-6259 B2 Rad 12 09 01.17 -63 16 02.2           ~ 1 0
10 ESO 95-1 HII 12 09 01.260 -63 15 59.63     16.00     ~ 96 2
11 [MVT2003] IRAS 12073-6233 B Rad 12 09 57.88 -62 49 33.5           ~ 1 0
12 IRAS 12073-6233 mul 12 10 00.4 -62 49 57           ~ 51 0
13 [MVT2003] IRAS 12073-6233 A Rad 12 10 01.11 -62 49 53.9           ~ 1 0
14 [GS70] 298.2-00.3 HII 12 10 01.886 -62 50 00.46           ~ 67 1
15 IRAS 12331-6134 HII 12 36 01.9 -61 51 04           ~ 23 0
16 IRAS 15384-5348 HII 15 42 17.787 -53 58 30.88           ~ 41 1
17 [MVT2003] IRAS 15502-5302 B Rad 15 54 05.26 -53 11 39.4           ~ 1 0
18 [MVT2003] IRAS 15502-5302 A Rad 15 54 06.40 -53 11 40.2           ~ 1 0
19 IRAS 15502-5302 HII 15 54 07.2 -53 11 20           ~ 51 0
20 [MVT2003] IRAS 16128-5109 D Rad 16 16 40.25 -51 17 13.1           ~ 1 0
21 [MVT2003] IRAS 16128-5109 C Rad 16 16 40.32 -51 17 13.1           ~ 1 0
22 [MVT2003] IRAS 16128-5109 B Rad 16 16 40.55 -51 17 08.5           ~ 1 0
23 MSX6C G332.1544-00.4487 HII 16 16 40.776 -51 17 06.36           ~ 36 1
24 [MVT2003] IRAS 16128-5109 A Rad 16 16 41.06 -51 17 02.0           ~ 1 0
25 [MVT2003] IRAS 17160-3707 E Rad 17 19 25.5 -37 10 05           ~ 1 0
26 GAL 350.10+00.09 HII 17 19 26.1 -37 10 54           ~ 43 0
27 [MVT2003] IRAS 17160-3707 B Rad 17 19 26.92 -37 10 24.6           ~ 1 0
28 [MVT2003] IRAS 17160-3707 A Cl* 17 19 27.51 -37 11 02.7           ~ 2 0
29 [MVT2003] IRAS 17160-3707 C Rad 17 19 32.75 -37 10 46.8           ~ 1 0
30 [MVT2003] IRAS 17160-3707 D Rad 17 19 35.69 -37 10 56.5           ~ 1 0
31 IRAS 17221-3619 HII 17 25 33 -36 21.7           ~ 36 0
32 [MVT2003] IRAS 17279-3350 C Rad 17 31 15.04 -33 51 16.0           ~ 2 0
33 [MVT2003] IRAS 17279-3350 A Rad 17 31 17.62 -33 52 45.4           ~ 2 0
34 IRAS 17279-3350 HII 17 31 18.0 -33 52 50           ~ 24 0
35 [MVT2003] IRAS 17279-3350 B Rad 17 31 20.54 -33 53 25.7           ~ 2 0
36 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
37 NAME Sgr D HII HII 17 48 41.79 -28 01 41.3           ~ 69 1
38 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 226 0
39 GAL 013.875+00.28 HII 18 14 35.2 -16 45 21           ~ 99 0
40 [WAM82] 023.955+0.152 HII 18 34 24.9 -07 54 50           ~ 70 1
41 CORNISH G029.9559-00.0168 Y*O 18 46 04.18 -02 39 21.3           ~ 385 0
42 RAFGL 5536 HII 18 50 30.8 -00 01 59           ~ 48 0
43 RAFGL 5541 Y*O 18 52 50.26 +00 55 29.6           ~ 122 1
44 SH 2-87 bub 19 46 20.69 +24 35 15.4           ~ 161 2
45 W 58a HII 20 01 45.8 +33 32 43           ~ 294 4
46 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
47 IRAS 21190+5140 HII 21 20 44.84 +51 53 27.5           ~ 133 2
48 SH 2-138 HII 22 32 45.7 +58 28 20           ~ 115 2
49 IC 1470 HII 23 05 09.9 +60 14 31   11.5       ~ 180 2
50 SH 2-159 Y*O 23 15 31.2384366062 +61 07 10.181362705           ~ 188 1
51 [MVT2003] IRAS 15384-5348 Knot 5 Rad ~ ~           ~ 1 0
52 [MVT2003] IRAS 15384-5348 Knot 4 Rad ~ ~           ~ 1 0
53 [MVT2003] IRAS 15384-5348 Knot 3 Rad ~ ~           ~ 1 0
54 [MVT2003] IRAS 15384-5348 Knot 2 Rad ~ ~           ~ 1 0
55 [MVT2003] IRAS 18032-2032 D Rad ~ ~           ~ 1 0
56 [MVT2003] IRAS 15384-5348 Knot 1 Rad ~ ~           ~ 1 0
57 [MVT2003] IRAS 18032-2032 C Rad ~ ~           ~ 1 0
58 [MVT2003] IRAS 18032-2032 B Rad ~ ~           ~ 1 0
59 [MVT2003] DR 21 A Rad ~ ~           ~ 1 0

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