2015A&A...582A...1D

Query : 2015A&A...582A...1D

2015A&A...582A...1D - Astronomy and Astrophysics, volume 582A1-1 (2015/10-1)

Bipolar HII regions - Morphology and star formation in their vicinity. I. G319.88+00.79 and G010.32-00.15.

DEHARVENG L., ZAVAGNO A., SAMAL M.R., ANDERSON L.D., LELEU G., BREVOT D., DUARTE-CABRAL A., MOLINARI S., PESTALOZZI M., FOSTER J.B., RATHBORNE J.M. and JACKSON J.M.

Abstract (from CDS):

Our goal is to identify bipolar HII regions and to understand their morphology, their evolution, and the role they play in the formation of new generations of stars. We use the Spitzer-GLIMPSE, -MIPSGAL, and Herschel-Hi-GAL surveys to identify bipolar HII regions, looking for (ionized) lobes extending perpendicular to dense filamentary structures. We search for their exciting star(s) and estimate their distances using near-IR data from the 2MASS or UKIDSS surveys. Dense molecular clumps are detected using Herschel-SPIRE data, and we estimate their temperature, column density, mass, and density. MALT90 observations allow us to ascertain their association with the central HII region (association based on similar velocities). We identify Class 0/I young stellar objects (YSOs) using their Spitzer and Herschel-PACS emissions. These methods will be applied to the entire sample of candidate bipolar HII regions to be presented in a forthcoming paper. This paper focuses on two bipolar HII regions, one that is especially interesting in terms of its morphology, G319.88+00.79, and one in terms of its star formation, G010.32-00.15. Their exciting clusters are identified and their photometric distances estimated to be 2.6kpc and 1.75kpc, respectively; thus G010.32-00.15 (known as W31 north) lies much closer than previously assumed. We suggest that these regions formed in dense and flat structures that contain filaments. They have a central ionized region and ionized lobes extending perpendicular to the parental cloud. The remains of the parental cloud appear as dense (more than 104cm–3) and cold (14-17K) condensations. The dust in the photodissociation regions (in regions adjacent to the ionized gas) is warm (19-25K). Dense massive clumps are present around the central ionized region. G010.32-00.14 is especially remarkable because five clumps of several hundred solar masses surround the central HII region; their peak column density is a few 1023cm–2, and the mean density in their central regions reaches several 105cm–3. Four of them contain at least one massive YSO (including an ultracompact HII region and a high-luminosity Class I YSO); these clumps also contain extended green objects (EGOs) and Class II methanol masers. This morphology suggests that the formation of a second generation of massive stars has been triggered by the central bipolar HII region. It occurs in the compressed material of the parental cloud.

Abstract Copyright: ∼

Journal keyword(s): ISM: individual objects: G319.88+00.79 - dust, extinction - ISM: individual objects: G010.32-00.14 - HII regions - stars: formation

Nomenclature: Table 2: [DZS2015] 2-CN (Nos C1-C3). Table 4: [DZS2015] 4-CN (Nos C1-C7)>.

Simbad objects: 80

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Number of rows : 80
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 [DZS2015] 4-C6 cor 00 40 54.8 -00 12 24           ~ 1 0
2 [DZS2015] 4-C5 cor 00 41 08.1 -00 06 49           ~ 1 0
3 [DZS2015] 4-C4 cor 00 41 08.8 -00 07 30           ~ 1 0
4 [DZS2015] 4-C3 cor 00 41 12.0 -00 08 46           ~ 1 0
5 [DZS2015] 4-C7 cor 00 41 17.2 -00 15 26           ~ 1 0
6 [DZS2015] 4-C2 cor 00 41 17.6 -00 09 36           ~ 1 0
7 [DZS2015] 4-C1 cor 00 41 22.3 -00 08 30           ~ 1 0
8 Shk 201 GrG 12 51.2 +28 50           ~ 3 0
9 DENIS J150240.8-574001 LP? 15 02 40.8729224928 -57 40 01.256469456         12.51 ~ 2 0
10 SPICY 25224 Y*? 15 03 14.714 -57 41 54.16           ~ 2 0
11 SPICY 25229 Y*? 15 03 16.652 -57 41 08.67           ~ 2 0
12 SDC G319.859+0.818 DNe 15 03 17.95 -57 39 14.7           ~ 3 0
13 SPICY 25236 Y*? 15 03 20.65680 -57 41 04.7760           ~ 3 0
14 SPICY 25239 Y*? 15 03 22.440 -57 41 04.28           ~ 2 0
15 2MASS J15032788-5734429 Y*? 15 03 27.889 -57 34 42.97           ~ 2 0
16 [CPA2006] S98 bub 15 03 28.4 -57 39 18           ~ 3 0
17 SDC G319.882+0.810 DNe 15 03 28.62 -57 38 56.3           ~ 3 0
18 2MASS J15032869-5740376 Y*? 15 03 28.695 -57 40 37.66           ~ 2 0
19 IRAS 14597-5728 FIR 15 03 32.2 -57 40 02           ~ 5 0
20 [CH87] 319.874+0.770 HII 15 03 32 -57 40.1           ~ 10 0
21 SPICY 25253 Y*? 15 03 32.688 -57 40 21.18           ~ 2 0
22 [CPA2006] S97 bub 15 03 40.6 -57 41 00           ~ 5 0
23 SDC G319.886+0.753 DNe 15 03 42.62 -57 41 49.8           ~ 3 0
24 UCAC2 6636137 Y*? 15 03 42.6215789400 -57 40 55.557005052   17.90 16.32 15.85 13.83 ~ 2 0
25 SDC G319.910+0.796 DNe 15 03 42.81 -57 38 53.6           ~ 3 0
26 2MASS J15035992-5737093 Y*? 15 03 59.9312950200 -57 37 09.361157448           ~ 3 0
27 SH 2-3 HII 17 12.4 -38 28           ~ 234 1
28 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
29 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 226 0
30 SSTGLMC G010.2520-00.0707 Y*? 18 08 32.808 -20 06 14.56           ~ 1 0
31 SPICY 74754 Y*? 18 08 43.217 -20 08 45.45           ~ 2 0
32 SPICY 74763 Y*? 18 08 43.938 -20 00 05.64           ~ 2 0
33 [HBM2005] G10.287-0.110 mm 18 08 45.9 -20 05 34           ~ 6 0
34 SPICY 74787 Y*? 18 08 46.01520 -20 05 51.5544           ~ 3 0
35 SPICY 74790 Y*? 18 08 46.348 -20 02 07.56           ~ 2 0
36 SSTGLMC G010.2712-00.1278 Y*? 18 08 47.95632 -20 06 53.9532           ~ 2 0
37 SSTGLMC G010.2692-00.1326 Y*? 18 08 48.788 -20 07 08.55           ~ 1 0
38 EGO G010.29-0.13 of? 18 08 49.3 -20 05 57           ~ 16 0
39 [WBH98] 18060-2005D Mas 18 08 49.36 -20 05 59.0           ~ 2 0
40 SDC G10.315-0.133 DNe 18 08 54.72 -20 04 43.9           ~ 3 0
41 [WBH98] 18060-2005C Mas 18 08 55.545 -20 05 57.96           ~ 2 0
42 SPICY 74855 Y*? 18 08 55.82784 -20 03 00.2844           ~ 3 0
43 [WC89] 010.30-0.15B HII 18 08 55.95 -20 05 55.4           ~ 33 0
44 GAL 010.30-00.15 HII 18 08 56.11 -20 05 53.8           ~ 85 0
45 SPICY 74865 Y*? 18 08 57.825 -20 06 32.05           ~ 2 0
46 SDC G10.215-0.206 DNe 18 08 58.56 -20 12 06.8           ~ 3 0
47 2MASS J18085879-2005195 Y*? 18 08 58.795 -20 05 19.52           ~ 2 0
48 SPICY 74880 Y*? 18 08 58.896 -20 07 02.97           ~ 2 0
49 [WBH98] 18060-2005A Mas 18 08 59.99 -20 03 35.6           ~ 2 0
50 MMB G010.342-00.142 cor 18 08 59.99 -20 03 35.4           ~ 43 0
51 2MASS J18090009-2011163 Y*? 18 09 00.098 -20 11 16.32           ~ 2 0
52 SPICY 74889 Y*? 18 09 00.321 -20 11 28.86           ~ 2 0
53 SPICY 74894 Y*? 18 09 00.630 -20 11 36.06           ~ 2 0
54 [WBH98] 18060-2005B Y*? 18 09 01.4549 -20 05 07.854           ~ 33 0
55 MMB G010.356-00.148 cor 18 09 03.07 -20 03 02.2           ~ 22 0
56 SSTGLMC G010.3561-00.1485 Y*? 18 09 03.108 -20 03 02.54           ~ 1 0
57 SDC G10.291-0.187 DNe 18 09 03.75 -20 07 33.8           ~ 3 0
58 SPICY 74942 Y*? 18 09 04.645 -20 03 19.94           ~ 2 0
59 SDC G10.358-0.166 DNe 18 09 07.48 -20 03 25.5           ~ 3 0
60 SPICY 75002 Y*? 18 09 11.902 -20 11 10.02           ~ 2 0
61 SPICY 75005 Y*? 18 09 12.165 -20 09 39.43           ~ 2 0
62 SPICY 75018 Y*? 18 09 13.301 -20 03 13.27           ~ 2 0
63 SPICY 75042 Y*? 18 09 15.773 -20 06 59.52           ~ 2 0
64 2MASS J18091745-2002399 Y*? 18 09 17.458 -20 02 39.99           ~ 2 0
65 CORNISH G010.3204-00.2328 HII 18 09 17.53 -20 07 23.1           ~ 3 0
66 SPICY 75074 Y*? 18 09 19.53888 -20 05 17.2428           ~ 3 0
67 SDC G10.405-0.200 DNe 18 09 20.77 -20 01 57.5           ~ 3 0
68 SPICY 75094 Y*? 18 09 21.38232 -20 01 51.1284           ~ 3 0
69 SSTGLMC G010.3204-00.2587 Y*? 18 09 23.323 -20 08 07.34           ~ 1 0
70 SPICY 75124 Y*? 18 09 23.46312 -20 05 23.4924           ~ 3 0
71 GPSR5 10.322-0.259 Rad 18 09 23.49 -20 08 02.7           ~ 3 0
72 RAFGL 2078 HII 18 09 25.90 -20 19 24.7           ~ 81 1
73 W 31 SFR 18 10 28.6 -19 55 51           ~ 280 0
74 W 31c HII 18 10 29.1 -19 56 05           ~ 357 0
75 [ABB2014] WISE G013.222+00.082 bub 18 14 01.3 -17 25 38           ~ 15 1
76 [ABB2014] WISE G013.186+00.042 bub 18 14 06.2 -17 28 31           ~ 26 0
77 [DZS2015] 2-C3 cor 21 19 19.8 +00 47 33           ~ 1 0
78 [DZS2015] 2-C2 cor 21 19 28.0 +00 47 12           ~ 1 0
79 [DZS2015] 2-C1 cor 21 19 36.3 +00 47 37           ~ 1 0
80 NAME Galactic Bar reg ~ ~           ~ 1458 0

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