2019ApJ...884...77B

Query : 2019ApJ...884...77B

2019ApJ...884...77B - Astrophys. J., 884, 77-77 (2019/October-2)

The distribution of dense cores near H II regions.

BOBOTSIS G. and FICH M.

Abstract (from CDS):

An investigation of dust emission associated with a large sample of H II regions has been carried out. Stacked results from this sample suggest that each H II region is at or near the center of a cluster of dense cores that extends far beyond the H II region, and has a volume density that decreases as r–3. The data also show evidence for enhanced numbers of cores near the boundary of the H II regions. At the same time, a significant decrease in the number of cores, consistent with no cores, is observed in the interior of these H II regions. Neither these H II regions nor their associated massive OB stars were found to have a significant heating effect on their associated dusty clumps. "Clouds," or the outermost layers of the clumps in which the cores are embedded, are found to exert a strong shielding effect against external heating sources. Despite this, a large portion of the identified cores were found to be warmer than their surrounding clouds and consequently may be in the initial stages of star formation. The star-formation efficiency of the 7 H II region systems with the most reliable mass budgets ranged between 1% and 9%.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Massive stars - Young stellar objects - Dense interstellar clouds

Simbad objects: 38

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Number of rows : 38
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 SH 2-175 HII 00 27 17.09 +64 42 23.3   12.26 11.37     ~ 45 1
2 SH 2-201 HII 03 03 17.9 +60 27 52           ~ 118 0
3 NGC 1333 OpC 03 29 09.2 +31 20 59           ~ 1575 1
4 SH 2-212 HII 04 40 36.52 +50 27 44.3           ~ 102 2
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
6 LBN 159.33+02.55 HII 04 56 05.5 +47 22 33           ~ 73 0
7 LBN 159.17+03.33 HII 04 58 45.7 +47 59 36           ~ 86 1
8 HD 242926 Y*O 05 22 40.0955764848 +33 19 09.399870012 9.04 9.65 9.40     O7Vz 87 0
9 IC 417 HII 05 28 03 +34 24.7           ~ 59 0
10 NGC 1931 OpC 05 31 23 +34 14.0     10.1     ~ 136 0
11 SH 2-233 HII 05 38 31.5 +35 51 19           ~ 71 1
12 SH 2-231 Y*O 05 39 13.2 +35 45 48           ~ 135 0
13 SH 2-235 HII 05 41.1 +35 50           ~ 236 0
14 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
15 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
16 SH 2-232 HII 05 42 28 +36 11.4           ~ 56 0
17 NGC 2071 RNe 05 47 10 +00 18.0           ~ 661 1
18 SH 2-242 HII 05 51 54.8 +27 01 56           ~ 56 1
19 LBN 189.02+00.91 HII 06 08 23 +21 35.3           ~ 73 0
20 SH 2-259 HII 06 11 23.57 +17 26 31.8           ~ 35 1
21 LBN 192.48-00.21 HII 06 11 59 +18 03.3           ~ 96 0
22 SH 2-258 HII 06 13 28 +17 55.5           ~ 78 0
23 SH 2-255 B HII 06 14 24.1 +17 45 13           ~ 9 0
24 SH 2-283 HII 06 38 29 +00 42.3           ~ 49 0
25 BFS 64 HII 07 00 30.9 -08 52 40           ~ 14 0
26 IC 466 HII 07 08 37 -04 18.8           ~ 49 0
27 SH 2-305 HII 07 30 04.1 -18 32 13           ~ 55 0
28 GRS G308.60 +00.60 HII 13 39.9 -61 45           ~ 108 0
29 SH 2-3 HII 17 12.4 -38 28           ~ 234 1
30 SH 2-39 HII 18 16 52.5 -18 41 50           ~ 15 0
31 LBN 063.10+00.46 HII 19 49 11.7 +26 51 36   14.60 13.63     ~ 55 0
32 LBN 070.13+01.71 HII 20 00 53.25 +33 29 26.0   13.79 12.86     ~ 57 2
33 LBN 070.24+01.53 HII 20 01 44.7 +33 31 14           ~ 40 1
34 SH 2-104 HII 20 17 52.5 +36 49 24           ~ 97 0
35 SH 2-128 HII 21 32 09.9 +55 52 53           ~ 173 1
36 SH 2-152 HII 22 58 40.8107767416 +58 46 59.226036024           ~ 147 1
37 LBN 115.71-01.61 HII 23 52 56.5 +60 29 04           ~ 41 0
38 NAME Gould Belt PoG ~ ~           ~ 956 1

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