2009MNRAS.392..170S


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET06:26:36

2009MNRAS.392..170S - Mon. Not. R. Astron. Soc., 392, 170-180 (2009/January-1)

A multitransition molecular line study of inward motions towards massive star-forming cores.

SUN Y. and GAO Y.

Abstract (from CDS):

A multitransition 3-mm molecular line single pointing and mapping survey was carried out towards 29 massive star-forming cores in order to search for the signature of inward motions. Up to seven different transitions, optically thick lines HCO+(1-0), CS(2-1), HNC(1-0), HCN(1-0) and 12CO(1-0), and optically thin lines C18O(1-0) and 13CO(1-0) were observed towards each source. The normalized velocity differences between the peak velocities of optically thick lines and optically thin line C18O(1-0) for each source were derived. Prominent inward motions are probably present in either HCO+(1-0) or CS(2-1) or HNC(1-0) observations in most sources. Our observations show that there is a significant difference in the incidence of blueshifted asymmetric line profiles between CS(2-1) and HCO+(1-0). The HCO+(1-0) shows the highest occurrence of obvious asymmetric features, perhaps owing to different optical depth between CS(2-1) and HCO+(1-0). HCO+(1-0) appears to be the best inward motion tracer. The mapping observations of multiple line transitions enable us to identify six strong infall candidates: G123.07-6.31, W75(OH), S235N, CEP-A, W3(OH) and NGC 7538. The infall signature is extended up to a linear scale >0.2pc.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): stars: formation - ISM: kinematics and dynamics - ISM: molecules - radio lines: ISM

CDS comments: In table 1 the positions of GAL 123.07-06.31 are false.

Simbad objects: 32

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Number of rows : 32

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 GAL 123.07-06.31 reg 00 52 25.2 +56 33 53           ~ 14 0
2 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 947 2
3 NAME W 5 East MoC 03 01 32 +60 29.2           ~ 121 2
4 GAL 174.20-00.08 Cld 05 30 45.9 +33 47 56           ~ 184 2
5 SH 2-231 HII 05 39 12.9 +35 45 54           ~ 121 0
6 SH 2-235 B HII 05 40 52.366 +35 41 29.43   17       ~ 172 1
7 SH 2-235 HII 05 41.1 +35 50           ~ 191 0
8 GAL 192.16-03.82 HII 05 58 13.4 +16 32 00           ~ 135 1
9 SH 2-252 A HII 06 08 33 +20 39.3           ~ 73 0
10 NAME SH 2-255 IRS 1 Y*O 06 12 54.0060 +17 59 22.958           ~ 320 0
11 IC 2162 HII 06 13 04.1 +17 58 44           ~ 339 2
12 DRT03 G19.61-0.23 4 HII 18 27 38.20 -11 56 31.4           ~ 5 1
13 OH 20.1 -0.1 SFR 18 28 10.3918 -11 28 44.164           ~ 107 0
14 GAL 024.49-00.04 HII 18 36 06.8 -07 30 54           ~ 12 0
15 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 833 2
16 SH 2-76 E SFR 18 56 12 +07 53.4           ~ 32 0
17 GAL 035.58-00.03 reg 18 56 23.5 +02 20 38           ~ 31 1
18 Caswell OH 043.80-00.13 Mas 19 11 54.3 +09 35 55           ~ 61 0
19 LDN 663 DNe 19 36 55 +07 34.4           ~ 562 0
20 MSX6C G059.7831+00.0648 Y*O 19 43 11.21664 +23 44 03.9696           ~ 130 0
21 IRAS 19410+2336 SFR 19 43 11.5 +23 44 06           ~ 142 0
22 SH 2-87 HII 19 46 20.7 +24 35 15           ~ 152 2
23 LBN 061.50+00.29 HII 19 46 45.7 +25 12 56           ~ 62 0
24 SH 2-88 B HII 19 46 47.329 +25 12 45.62           ~ 153 2
25 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 399 0
26 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 411 2
27 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 361 1
28 [W71c] DR 21S HII 20 39 00.52 +42 19 40.1           ~ 8 0
29 W 75(OH) Rad 20 39 01.01 +42 22 49.9           ~ 37 0
30 BFS 11 HII 21 43.0 +66 07           ~ 18 0
31 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 701 2
32 NGC 7538 OpC 23 13 37 +61 30.0           ~ 831 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-06:26:37

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