2018A&A...617A..67S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:03:25

2018A&A...617A..67S - Astronomy and Astrophysics, volume 617A, 67-67 (2018/9-1)

Bipolar H II regions. II. Morphologies and star formation in their vicinities.

SAMAL M.R., DEHARVENG L., ZAVAGNO A., ANDERSON L.D., MOLINARI S. and RUSSEIL D.

Abstract (from CDS):


Aims. We aim to identify bipolar Galactic HII regions and to understand their parental cloud structures, morphologies, evolution, and impact on the formation of new generations of stars.
Methods. We use the Spitzer-GLIMPSE, Spitzer-MIPSGAL, and Herschel-Hi-GAL surveys to identify bipolar HII regions and to examine their morphologies. We search for their exciting star(s) using NIR data from the 2MASS, UKIDSS, and VISTA surveys. Massive molecular clumps are detected near these bipolar nebulae, and we estimate their temperatures, column densities, masses, and densities. We locate Class 0/I young stellar objects (YSOs) in their vicinities using the Spitzer and Herschel-PACS emission.
Results. Numerical simulations suggest bipolar HII regions form and evolve in a two-dimensional flat- or sheet-like molecular cloud. We identified 16 bipolar nebulae in a zone of the Galactic plane between l±60° and |b|<1°. This small number, when compared with the 1377 bubble HII regions in the same area, suggests that most HII regions form and evolve in a three-dimensional medium. We present the catalogue of the 16 bipolar nebulae and a detailed investigation for six of these. Our results suggest that these regions formed in dense and flat structures that contain filaments. We find that bipolar HII regions have massive clumps in their surroundings. The most compact and massive clumps are always located at the waist of the bipolar nebula, adjacent to the ionised gas. These massive clumps are dense, with a mean density in the range of 105cm–3 to several 106cm–3 in their centres. Luminous Class 0/I sources of several thousand solar luminosities, many of which have associated maser emission, are embedded inside these clumps. We suggest that most, if not all, massive 0/I YSO formation has probably been triggered by the expansion of the central bipolar nebula, but the processes involved are still unknown. Modelling of such nebula is needed to understand the star formation processes at play.

Abstract Copyright: © ESO 2018

Journal keyword(s): H II regions - dust, extinction - stars: formation

Simbad objects: 94

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Number of rows : 94

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SH 2-201 HII 03 03 17.9 +60 27 52           ~ 111 0
2 NAME Ori Complex Cld 05 35.3 -05 23           ~ 334 0
3 Caswell OH 316.64-00.09 Mas 14 44 18.35 -59 55 11.5           ~ 3 0
4 Caswell OH 316.64-00.08 Mas 14 44 18.5 -59 54 59           ~ 7 0
5 Caswell CH3OH 316.64-00.09 Mas 14 44 20.2 -59 55 21           ~ 6 0
6 OH 316.76 -0.01 Mas 14 44 56.18 -59 48 12.3           ~ 11 0
7 OH 316.77 -0.02 Mas 14 44 58.8 -59 48 09           ~ 10 0
8 [CPA2006] S111 bub 14 45 12 -59 50.8           ~ 5 0
9 SDC G316.786-0.044 DNe 14 45 13.02 -59 49 11.4           ~ 4 0
10 SDC G316.825+0.013 DNe 14 45 18.24 -59 45 02.0           ~ 3 0
11 GAL 316.8-00.1 HII 14 45 19.4 -59 49 32           ~ 18 0
12 [CPA2006] S110 bub 14 45 19.8 -59 47 55           ~ 7 0
13 GAL 316.81-00.04 HII 14 45 21.0 -59 48 14           ~ 8 0
14 2MASS J14452143-5949251 IR 14 45 21.437 -59 49 25.20           ~ 2 0
15 Caswell H2O 316.81-00.06 Mas 14 45 25.0 -59 49 29           ~ 6 0
16 Caswell OH 316.811-00.057 Mas 14 45 26.34 -59 49 15.4           ~ 3 0
17 MSX6C G316.8112-00.0566 IR 14 45 26.4 -59 49 13           ~ 2 0
18 MMB G316.811-00.057 Mas 14 45 26.43 -59 49 16.3           ~ 17 0
19 SDC G316.821-0.062 DNe 14 45 32.07 -59 49 16.9           ~ 3 0
20 [CPA2006] S109 bub 14 45 36 -59 51.6           ~ 4 0
21 [CH87] 319.874+0.770 HII 15 03 32 -57 40.1           ~ 9 0
22 SDC G320.218+0.501 DNe 15 06 48.31 -57 45 13.8           ~ 3 0
23 SDC G320.219+0.430 DNe 15 07 04.64 -57 48 53.8           ~ 3 0
24 RCW 88 HII 15 07 07.50 -57 48 22.0     12.00     ~ 16 1
25 VVV J150713.07-574750.1 ? 15 07 13.080 -57 47 50.18           ~ 1 0
26 SDC G320.262+0.467 DNe 15 07 13.14 -57 45 41.4           ~ 3 0
27 SDC G320.252+0.447 DNe 15 07 13.57 -57 47 02.5           ~ 3 0
28 VVV J150714.28-574824.0 ? 15 07 14.289 -57 48 24.08           ~ 1 0
29 VVV J150716.69-574836.7 ? 15 07 16.697 -57 48 36.72           ~ 1 0
30 [DB2002b] G320.24+0.42 DNe 15 07 17 -57 48.5           ~ 4 0
31 IRAS 15033-5736 FIR 15 07 18.9 -57 48 52           ~ 3 0
32 SDC G320.235+0.346 DNe 15 07 29.66 -57 52 48.6           ~ 4 0
33 SDC G320.234+0.331 DNe 15 07 32.50 -57 53 36.2           ~ 5 0
34 SDC G320.322+0.469 DNe 15 07 36.06 -57 43 48.9           ~ 3 0
35 SDC G320.291+0.408 DNe 15 07 37.50 -57 47 54.9           ~ 3 0
36 AGAL G320.271+00.292 Y*O 15 07 55.62 -57 54 29.7           ~ 12 0
37 SDC G320.284+0.287 DNe 15 08 02.11 -57 54 25.0           ~ 3 0
38 GAL 330.04-00.05 HII 16 04 56 -52 26.0           ~ 6 0
39 GAL 331.26-00.19 HII 16 11 27 -51 42.0           ~ 8 0
40 SDC G338.931-0.031 DNe 16 43 07.58 -46 04 36.1           ~ 3 0
41 2MASS J16430823-4609129 IR 16 43 08.23704 -46 09 12.9024           ~ 1 0
42 MMB G338.875-00.084 Mas 16 43 08.25 -46 09 12.8           ~ 10 0
43 IRAS 16395-4600 IR 16 43 12.7 -46 05 42           ~ 3 0
44 2MASS J16431292-4605232 IR 16 43 12.92328 -46 05 23.2728           ~ 1 0
45 [DBS2003] 105 Cl* 16 43 16 -46 06.0           ~ 3 0
46 MMB G338.935-00.062 Mas 16 43 16.01 -46 05 40.2           ~ 17 0
47 2MASS J16431603-4605401 IR 16 43 16.03056 -46 05 40.1928           ~ 1 0
48 [KC97c] G338.9-00.1 HII 16 43 17 -46 05.9           ~ 7 0
49 SDC G338.930-0.079 DNe 16 43 19.50 -46 06 32.0           ~ 3 0
50 SDC G338.928-0.086 DNe 16 43 21.15 -46 06 54.8           ~ 3 0
51 SDC G338.962-0.058 DNe 16 43 21.24 -46 04 16.6           ~ 3 0
52 SDC G338.986-0.049 DNe 16 43 24.49 -46 02 48.2           ~ 3 0
53 SDC G338.968-0.072 DNe 16 43 26.36 -46 04 32.0           ~ 3 0
54 SDC G338.928-0.112 DNe 16 43 27.85 -46 07 56.3           ~ 3 0
55 2MASS J16433078-4608070 IR 16 43 30.78384 -46 08 07.0908           ~ 1 0
56 IRAS 16399-4601 * 16 43 34.52 -46 07 07.6           ~ 3 0
57 IRAS 16421-4532 HII 16 45 45.2 -45 38 15           ~ 8 0
58 2MASS J16455527-4538121 * 16 45 55.27920 -45 38 12.1056           ~ 1 0
59 VVV J164555.28-453811.8 * 16 45 55.287 -45 38 11.88           ~ 1 0
60 GAL 339.58-00.12 HII 16 45 56.8 -45 38 55           ~ 11 0
61 MMB G339.582-00.127 Mas 16 45 58.82 -45 38 47.2           ~ 15 0
62 EGO G339.58-0.13 of? 16 45 59.5 -45 38 44           ~ 4 0
63 GAL 339.62-00.12 HII 16 46 04.9 -45 36 43           ~ 16 0
64 MMB G339.622-00.121 cor 16 46 05.99 -45 36 43.3           ~ 31 0
65 SDC G342.036+0.434 DNe 16 52 24.55 -43 24 17.4           ~ 3 0
66 SDC G342.068+0.452 DNe 16 52 26.94 -43 22 07.9           ~ 3 0
67 SDC G342.067+0.437 DNe 16 52 30.43 -43 22 42.9           ~ 3 0
68 SDC G342.092+0.449 DNe 16 52 32.52 -43 21 08.3           ~ 3 0
69 [CPA2006] S18 bub 16 52 33.0 -43 22 42           ~ 6 0
70 2MASS J16523341-4323400 * 16 52 33.41016 -43 23 40.0524           ~ 1 0
71 IRAS 16489-4318 HII 16 52 33.8 -43 23 37           ~ 8 0
72 GAL 342.09+00.42 HII 16 52 34 -43 23.4           ~ 8 0
73 SDC G342.081+0.432 DNe 16 52 34.65 -43 22 17.9           ~ 3 0
74 [CPA2006] S20 bub 16 52 36.0 -43 25 43           ~ 5 0
75 [CPA2006] S19 bub 16 52 42.6 -43 24 27           ~ 3 0
76 SDC G342.073+0.390 DNe 16 52 43.59 -43 24 16.3           ~ 3 0
77 SDC G342.103+0.404 DNe 16 52 46.47 -43 22 19.3           ~ 3 0
78 GUM 55 HII 16 53 -42.2           ~ 25 0
79 [AAJ2015] G356.351+00.224 HII 17 35 46 -31 54.7           ~ 2 0
80 [KC97c] G004.4+00.1 HII 17 55 19.2 -25 05 14           ~ 7 0
81 GAL 008.14+00.23 HII 18 03 00.4 -21 48 05           ~ 39 0
82 GAL 010.30-00.15 HII 18 08 58.315 -20 05 15.27           ~ 79 0
83 IRAS 18223-1243 Y*O 18 25 10.92912 -12 42 15.5196           ~ 54 1
84 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 912 2
85 GAL 025.38-00.18 HII 18 38 14 -06 47.6           ~ 37 0
86 IRAS 19214+1458 HII 19 23 46.1 +15 04 51           ~ 10 0
87 [KBP2009] 736 Y*O 19 23 46.371 +15 04 50.80           ~ 2 0
88 2MASS J19234718+1504185 * 19 23 47.198 +15 04 18.56           ~ 2 0
89 2MASS J19234732+1504452 Y*O 19 23 47.342 +15 04 45.18           ~ 2 0
90 2MASS J19234876+1503598 Y*O 19 23 48.778 +15 03 59.96           ~ 2 0
91 W 51 SNR 19 23 50 +14 06.0           ~ 1143 1
92 2MASS J19235001+1503264 * 19 23 50.041 +15 03 26.85           ~ 2 0
93 HRDS G051.610-00.357 HII 19 27 48.0 +16 23 25           ~ 4 0
94 2MASS J16523565-4323079 * ~ ~           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-07:03:25

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