2023MNRAS.525.4761L

Query : 2023MNRAS.525.4761L

2023MNRAS.525.4761L - Mon. Not. R. Astron. Soc., 525, 4761-4800 (2023/November-1)

Opacities of dense gas tracers in galactic massive star-forming regions.

LIU S., WANG J., LI F., WU J., ZHANG Z.-Y., LI D., TANG N. and ZUO P.

Abstract (from CDS):

Optical depths of dense molecular gas are commonly used in Galactic and extragalactic studies to constrain the dense gas mass of the clouds or galaxies. The optical depths are often obtained based on spatially unresolved data, especially in galaxies, which may affect the reliability of such measurements. We examine such effects in spatially resolved Galactic massive star-forming regions. Using the 10-m SMT telescope, we mapped HCN and H13CN 3-2, HCO+, and H13CO+ 3-2 towards 51 Galactic massive star-forming regions, 30 of which resulted in robust determination of spatially resolved optical depths. Conspicuous spatial variations of optical depths have been detected within each source. We first obtained opacities for each position and calculated an optical-thick line intensity-weighted average, then averaged all the spectra and derived a single opacity for each region. The two were found to agree extremely well, with a linear least square correlation coefficient of 0.997 for the whole sample.

Abstract Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): opacity - ISM: clouds - ISM: molecules - galaxies: ISM

Simbad objects: 47

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Number of rows : 47
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 [HLB98] Onsala 2 Mas 00 36 47.3530 +63 29 02.160           ~ 16 0
2 LDN 1287 DNe 00 36 47.5 +63 29 02           ~ 103 0
3 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
4 NGC 281 HII 00 52 25.1 +56 33 54           ~ 251 1
5 [HMW2016] G133.947+01.064 Mas 02 27 03.8190 +61 52 25.230           ~ 12 0
6 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
7 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
8 MMB G188.946+00.886 Mas 06 08 53.3441 +21 38 29.099           ~ 31 0
9 IRAS 07299-1651 Y*O 07 32 09.7800 -16 58 12.800           ~ 85 0
10 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
11 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
12 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
13 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
14 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1734 2
15 RAFGL 2046 HII 18 00 32.1 -24 04 03           ~ 380 0
16 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 226 0
17 MMB G010.472+00.027 cor 18 08 38.2290 -19 51 50.262           ~ 83 1
18 W 31 SFR 18 10 28.6 -19 55 51           ~ 280 0
19 W 31c HII 18 10 29.1 -19 56 05           ~ 357 0
20 CORNISH G011.9368-00.6158 HII 18 14 01.0 -18 53 23           ~ 88 1
21 CORNISH G012.8050-00.2007 HII 18 14 13.96 -17 55 44.9           ~ 11 1
22 IRAS 18134-1942 HII 18 16 22.1327 -19 41 27.219           ~ 72 0
23 GAL 014.33-00.64 HII 18 18 53.5 -16 47 39           ~ 75 0
24 NAME M 17 UC1 HII 18 20 24.82 -16 11 34.9           ~ 57 1
25 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
26 AGAL G016.586-00.051 cor 18 21 09.067 -14 31 49.18           ~ 39 0
27 Caswell CH3OH 023.010-00.411 Mas 18 34 40.2800 -09 00 38.360           ~ 20 0
28 AGAL G027.366-00.166 cor 18 41 51 -05 01.7           ~ 28 0
29 GAL 029.95-00.01 ? 18 46 01.46 -02 39 33.7           ~ 9 0
30 W 43s Rad 18 47 41.68 -02 00 24.3           ~ 30 0
31 Caswell OH 035.02+00.35 Mas 18 54 00.6576 +02 01 19.217           ~ 17 0
32 IRAS 18517+0437 SFR 18 54 13.8 +04 41 32           ~ 89 0
33 OH 035.2-00.7 Mas 18 58 13.0517 +01 40 35.674           ~ 49 0
34 W 49n HII 19 10 13.2 +09 06 12           ~ 497 3
35 [PCC93] 358 Mas 19 10 13.4100 +09 06 12.800           ~ 17 0
36 OH 043.796-00.127 Mas 19 11 53.9868 +09 35 50.325           ~ 89 0
37 IRAS 19095+0930 cor 19 11 54.09216 +09 35 49.6896           ~ 115 0
38 [WBN74] W 51 IRS 2 SFR 19 23 39.93 +14 31 09.4           ~ 321 0
39 W 51m Rad 19 23.7 +14 30           ~ 72 0
40 OH 049.489-00.388 Mas 19 23 43.8700 +14 30 29.500           ~ 9 0
41 Onsala 1 cor 20 10 09.2036 +31 31 36.090           ~ 194 0
42 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 469 0
43 GAL 075.76+00.34 Mas 20 21 41.0860 +37 25 29.280           ~ 30 1
44 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
45 GAL 081.87+00.78 Mas 20 38 36.9 +42 37 38           ~ 11 0
46 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 760 2
47 GAL 109.87+02.11 Mas 22 56 18.1 +62 01 46           ~ 12 0

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