2007ApJ...669L..37W

Query : 2007ApJ...669L..37W

2007ApJ...669L..37W - Astrophys. J., 669, L37-L40 (2007/November-1)

Signatures of inflow motion in cores of massive star formation: potential collapse candidates.

WU Y., HENKEL C., XUE R., GUAN X. and MILLER M.

Abstract (from CDS):

Using the IRAM 30 m telescope, a mapping survey in optically thick and thin lines was performed toward 46 high-mass-star-forming regions. The sample includes UC H II precursors and UC H II regions. Seventeen sources are found to show ``blue profiles'', the expected signature of collapsing cores. The excess of sources with blue over red profiles [(Nblue-Nred)/Ntotal] is 29% in the HCO+ J=1-0 line, with a probability of 0.6% that this is caused by random fluctuations. UC H II regions show a higher excess (58%) than UC H II precursors (17%), indicating that material is still accreted after the onset of the UC H II phase. Similar differences in the excess of blue profiles as a function of evolutionary state are not observed in low-mass-star-forming regions. Thus, if confirmed for high-mass-star-forming sites, this would point to a fundamental difference between low- and high-mass-star formation. Possible explanations are inadequate thermalization, stronger influence of outflows in massive early cores, larger gas reserves around massive stellar objects, or different trigger mechanisms between low- and high-mass-star formation.

Abstract Copyright: ∼

Journal keyword(s): ISM: Kinematics and Dynamics - ISM: Molecules - Radio Lines: ISM - Stars: Formation

Nomenclature: Table 2: [WHX2007] HHMMm+DDMMWW N=7, [WHX2007] S86WW (No. S86SE).

Simbad objects: 60

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Number of rows : 60
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 NAME W 3 West Rad 02 25 30.5 +62 06 17           ~ 16 0
2 NAME W 3 SE PoC 02 25 54.1 +62 04 25           ~ 7 0
3 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
4 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
5 IRAS 05358+3543 Y*O 05 39 09.92 +35 45 17.2           ~ 171 0
6 IRAS 05490+2658 Y*O 05 52 12.9 +26 59 33           ~ 51 0
7 GAL 010.47+00.03 HII 18 08 38.4 -19 51 52           ~ 159 0
8 AGAL G012.418+00.506 cor 18 10 51.09792 -17 55 49.6272           ~ 74 0
9 GAL 012.89+00.49 HII 18 11 51.3 -17 31 29           ~ 217 0
10 GAL 013.875+00.28 HII 18 14 35.2 -16 45 21           ~ 99 0
11 [WHX2007] 18144-1723NW HII 18 17 23.8 -17 22 09           ~ 1 0
12 IRAS 18144-1723 IR 18 17 24.4 -17 22 13           ~ 35 0
13 EGO G016.59-0.05 HII 18 21 07.9 -14 31 53           ~ 129 0
14 OH 016.59-00.05 Mas 18 21 09.0840 -14 31 48.556           ~ 85 0
15 GAL 019.61-00.23 HII 18 27 38.0 -11 56 42           ~ 162 0
16 MMB G019.884-00.534 cor 18 29 14.37 -11 50 23.0           ~ 119 1
17 AGAL G023.264+00.077 cor 18 33 24.00 -08 33 31.0           ~ 43 0
18 GAL 024.49-00.04 HII 18 36 06.8 -07 30 54           ~ 12 0
19 RAFGL 5515 HII 18 36 29.0 -07 40 33           ~ 35 0
20 [WHX2007] 18337-0743NE HII 18 36 40.9 -07 39 20           ~ 1 0
21 GAL 025.38-00.18 HII 18 38 14 -06 47.6           ~ 37 0
22 GAL 026.60-00.02 HII 18 39 55.9 -05 38 45           ~ 34 1
23 AGAL G027.184-00.081 cor 18 41 13.26 -05 08 57.9           ~ 60 0
24 [WHX2007] 18385-0512E HII 18 41 13.3 -05 09 06           ~ 1 0
25 IRAS 18449-0115 cor 18 47 34.27 -01 12 43.2           ~ 430 1
26 AGAL G030.848-00.081 Y*O 18 47 56 -01 53.5           ~ 36 0
27 [BSM2002] 18454-0158 4 cor 18 48 01.43 -01 52 36.8           ~ 3 0
28 BGPSv2 G032.119+00.092 cor 18 49 37.81 -00 41 01.1           ~ 33 0
29 IRAS 18488+0000 IR 18 51 24.8 +00 04 19           ~ 32 0
30 [WHX2007] 18488+0000SE HII 18 51 25.6 +00 04 07           ~ 2 0
31 RAFGL 2271 SFR 18 53 18.54 +01 14 57.9           ~ 537 0
32 AGAL G034.757+00.024 cor 18 54 40.76 +01 38 05.0           ~ 41 0
33 IRAS 18530+0215 cor 18 55 33.7 +02 19 09           ~ 43 0
34 SH 2-76 E SFR 18 56 12 +07 53.4           ~ 35 0
35 IRAS 18553+0414 cor 18 57 53.37 +04 18 15.7           ~ 36 0
36 [WHX2007] 18553+0414NE HII 18 57 53.4 +04 18 15           ~ 1 0
37 AGAL G039.388-00.141 cor 19 03 45 +05 40.7           ~ 58 1
38 [WHX2007] 19092+0841SW HII 19 11 36.7 +08 46 20           ~ 1 0
39 IRAS 19092+0841 Rad 19 11 37.4 +08 46 30           ~ 30 0
40 GAL 043.89-00.79 ? 19 14 26 +09 22.5           ~ 2 0
41 [WHX2007] 19217+1651N HII 19 23 58.8 +16 57 45           ~ 1 0
42 AGAL G051.678+00.719 cor 19 23 59 +16 57.7           ~ 48 0
43 AGAL G053.037+00.112 cor 19 28 55.5 +17 52 00           ~ 50 0
44 MSX6C G059.7831+00.0648 Y*O 19 43 11.2464 +23 44 03.270           ~ 159 0
45 IRAS 19410+2336 SFR 19 43 11.5 +23 44 06           ~ 160 0
46 LBN 059.38-00.15 HII 19 43 12 +23 15.0           ~ 25 1
47 [WHX2007] S86SE HII 19 43 49.7 +23 28 41           ~ 2 0
48 SH 2-87 bub 19 46 20.69 +24 35 15.4           ~ 161 2
49 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 469 0
50 CPM 35 cor 20 23 23.855 +41 17 40.49           ~ 58 0
51 IRAS 20319+3958 HII 20 33 49.24632 +40 08 44.1924           ~ 45 1
52 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1
53 IRAS 22134+5834 Y*O 22 15 09.08 +58 49 07.8           ~ 77 0
54 IRAS 23033+5951 Y*O 23 05 25.1762883456 +60 08 15.374293800           ~ 97 0
55 NGC 7538 OpC 23 13 37 +61 30.0           ~ 920 1
56 [WBN74] NGC 7538 IRS 11 Y*O 23 13 43.901 +61 26 57.98           ~ 56 0
57 NAME NGC 7538 IRS 11(OH) Mas 23 13 44.8 +61 26 50           ~ 12 0
58 NAME NGC 7538 IRS 1-3 reg 23 13 45 +61 28.3           ~ 26 1
59 IRAS 23139+5939 Y*O 23 16 10.3420 +59 55 28.596           ~ 100 0
60 IRAS 23151+5912 HII 23 17 21.0 +59 28 49           ~ 102 0

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