2017A&A...598A..76Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST08:23:16

2017A&A...598A..76Z - Astronomy and Astrophysics, volume 598A, 76-76 (2017/2-1)

A multiwavelength observation and investigation of six infrared dark clouds.

ZHANG C.-P., YUAN J.-H., LI G.-X., ZHOU J.-J. and WANG J.-J.

Abstract (from CDS):

Context. Infrared dark clouds (IRDCs) are ubiquitous in the Milky Way, yet they play a crucial role in breeding newly-formed stars.
Aims. With the aim of further understanding the dynamics, chemistry, and evolution of IRDCs, we carried out multiwavelength observations on a small sample.
Methods. We performed new observations with the IRAM 30 m and CSO 10.4 m telescopes, with tracers HCO+, HCN, N2H+, C18O, DCO+, SiO, and DCN toward six IRDCs G031.97+00.07, G033.69-00.01, G034.43+00.24, G035.39-00.33, G038.95-00.47, and G053.11+00.05.
Results. We investigated 44 cores including 37 cores reported in previous work and seven newly-identified cores. Toward the dense cores, we detected 6 DCO+, and 5 DCN lines. Using pixel-by-pixel spectral energy distribution (SED) fits of the Herschel 70 to 500 µm, we obtained dust temperature and column density distributions of the IRDCs. We found that N2H+ emission has a strong correlation with the dust temperature and column density distributions, while C18O showed the weakest correlation. It is suggested that N2H+ is indeed a good tracer in very dense conditions, but C18O is an unreliable one, as it has a relatively low critical density and is vulnerable to freezing-out onto the surface of cold dust grains. The dynamics within IRDCs are active, with infall, outflow, and collapse; the spectra are abundant especially in deuterium species.
Conclusions. We observe many blueshifted and redshifted profiles, respectively, with HCO+ and C18O toward the same core. This case can be well explained by model "envelope expansion with core collapse (EECC)".

Abstract Copyright: © ESO, 2017

Journal keyword(s): infrared: stars - stars: formation - ISM: IRDCs - HII regions - radio lines: ISM

VizieR on-line data: <Available at CDS (J/A+A/598/A76): table2.dat table3.dat table4.dat list.dat fits/*>

Nomenclature: Table 2: [ZYL2017] GNN-NN N=44.

Simbad objects: 61

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Number of rows : 61

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 IRAS 02476+5950 Cld 02 51 29.0 +60 03 14           ~ 16 0
2 LDN 1495A DNe 04 18.6 +28 25           ~ 9 0
3 LDN 1507A DNe 04 42 38.3 +29 43 45           ~ 18 0
4 NAME [BM89] L1517B cor 04 55 18.8 +30 38 04           ~ 130 0
5 LDN 1512 MoC 05 04 09.7 +32 43 09           ~ 160 0
6 JCMTSE J163138.6-244950 smm 16 31 39.2 -24 49 48           ~ 8 0
7 LDN 1689 DNe 16 32 22.5 -24 28 29           ~ 109 0
8 LDN 57 DNe 17 22 38.2 -23 49 34           ~ 283 1
9 [RJS2006] MSXDC G031.97+00.07 MM5 cor 18 49 21.9 -00 50 35           ~ 13 0
10 [RJS2006] MSXDC G031.97+00.07 MM7 mm 18 49 28.4 -00 48 54           ~ 5 0
11 [RJS2006] MSXDC G031.97+00.07 MM8 mm 18 49 29.1 -00 48 12           ~ 6 0
12 [RJS2006] MSXDC G031.97+00.07 MM9 mm 18 49 31.6 -00 46 30           ~ 7 0
13 [ZYL2017] G31-10 cor 18 49 31.8 -00 38 03           ~ 1 0
14 [RJS2006] MSXDC G031.97+00.07 MM3 mm 18 49 32.3 -00 47 02           ~ 6 0
15 [RJS2006] MSXDC G031.97+00.07 MM4 mm 18 49 33.0 -00 47 33           ~ 5 0
16 MSXDC G031.97+0.07 DNe 18 49 33.7 -00 47 48           ~ 12 0
17 [ZYL2017] G31-12 cor 18 49 34.6 -00 38 21           ~ 1 0
18 [RJS2006] MSXDC G031.97+00.07 MM6 mm 18 49 35.0 -00 46 44           ~ 6 0
19 [RJS2006] MSXDC G031.97+00.07 MM2 mm 18 49 36.0 -00 46 16           ~ 6 0
20 [ZYL2017] G31-1 cor 18 49 36.3 -00 45 45           ~ 1 0
21 [ZYL2017] G31-13 cor 18 49 37.6 -00 39 55           ~ 1 0
22 [ZYL2017] G31-11 cor 18 49 37.8 -00 40 59           ~ 1 0
23 [RJS2006] MSXDC G033.69-00.01 MM8 mm 18 52 53.9 +00 41 16           ~ 5 0
24 [RJS2006] MSXDC G033.69-00.01 MM11 mm 18 52 56.2 +00 41 48           ~ 5 0
25 [RJS2006] MSXDC G033.69-00.01 MM4 mm 18 52 56.4 +00 43 08           ~ 7 0
26 MSXDC G033.69-0.01 DNe 18 52 57.6 +00 42 59           ~ 7 0
27 [RJS2006] MSXDC G033.69-00.01 MM9 mm 18 52 58.1 +00 41 20           ~ 4 0
28 [RJS2006] MSXDC G033.69-00.01 MM7 mm 18 52 58.1 +00 44 08           ~ 4 0
29 [RJS2006] MSXDC G033.69-00.01 MM1 mm 18 52 58.8 +00 42 37           ~ 5 0
30 [RJS2006] MSXDC G034.43+00.24 MM8 mm 18 53 16.4 +01 26 20           ~ 30 0
31 AGAL G034.411+00.234 Y*O 18 53 18.0 +01 25 24           ~ 48 0
32 [RJS2006] MSXDC G034.43+00.24 MM7 mm 18 53 18.3 +01 27 13           ~ 29 0
33 [ZYL2017] G34-6 MoC 18 53 18.42 +01 27 33.9           ~ 18 0
34 [ZYL2017] G34-9 MoC 18 53 18.51 +01 28 30.5           ~ 21 0
35 [ZYL2017] G34-2 cor 18 53 18.6 +01 24 40           ~ 36 0
36 MSXDC G034.43+0.24 MoC 18 53 18.9 +01 26 39           ~ 60 0
37 [RJS2006] MSXDC G034.43+00.24 MM4 mm 18 53 19.0 +01 24 08           ~ 18 0
38 [RJS2006] MSXDC G034.43+00.24 MM5 mm 18 53 19.8 +01 23 30           ~ 14 0
39 [RJS2006] MSXDC G034.43+00.24 MM3 mm 18 53 20.4 +01 28 23           ~ 33 0
40 [NMH2011] 21 cor 18 57 06.0 +02 12 31           ~ 2 0
41 [ZYL2017] G35-8 MoC 18 57 06.88 +02 08 44.8           ~ 13 0
42 [ZYL2017] G35-4 MoC 18 57 06.92 +02 08 20.9           ~ 14 0
43 [ZYL2017] G35-10 cor 18 57 07.7 +02 11 50           ~ 1 0
44 [ZYL2017] G35-7 MoC 18 57 08.17 +02 10 51.8           ~ 20 0
45 [ZYL2017] G35-6 MoC 18 57 08.27 +02 08 57.7           ~ 14 0
46 [ZYL2017] G35-5 MoC 18 57 08.83 +02 08 24.3           ~ 14 0
47 MSXDC G035.39-0.33 MoC 18 57 09.0 +02 07 46           ~ 82 0
48 [ZYL2017] G35-9 MoC 18 57 11.37 +02 07 27.1           ~ 9 0
49 SNR G035.2-01.8 SNR 19 01.6 +01 14           ~ 144 0
50 GAL 038.91-00.44 bub 19 03 56.1 +05 06 53           ~ 16 0
51 [RJS2006] MSXDC G038.95-00.47 MM4 mm 19 04 00.6 +05 09 06           ~ 7 0
52 JCMTSE J190403.4+050756 smm 19 04 03.4 +05 07 56           ~ 11 0
53 [ZYL2017] G38-5 cor 19 04 07.4 +05 07 08           ~ 1 0
54 [ZYL2017] G38-1 cor 19 04 07.4 +05 08 48           ~ 1 0
55 [RJS2006] MSXDC G038.95-00.47 MM3 mm 19 04 07.4 +05 09 44           ~ 8 0
56 MSXDC G038.95-0.47 DNe 19 04 08.3 +05 08 49           ~ 14 0
57 GAL 039.30-01.04 HII 19 04 19.00 +05 06 42.7           ~ 3 0
58 [ZYL2017] G53-1 cor 19 29 17.2 +17 56 21           ~ 1 0
59 MSXDC G053.11+0.05 DNe 19 29 18.1 +17 54 33           ~ 12 0
60 [RJS2006] MSXDC G053.11+00.05 MM2 mm 19 29 20.2 +17 57 06           ~ 8 0
61 [RJS2006] MSXDC G053.11+00.05 MM4 mm 19 29 20.4 +17 55 04           ~ 7 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-08:23:16

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