2007ApJ...669..464S

Query : 2007ApJ...669..464S

2007ApJ...669..464S - Astrophys. J., 669, 464-482 (2007/November-1)

Molecular outflows and a mid-infrared census of the massive star formation region associated with IRAS 18507+0121.

SHEPHERD D.S., POVICH M.S., WHITNEY B.A., ROBITAILLE T.P., NURNBERGER D.E.A., BRONFMAN L., STARK D.P., INDEBETOUW R., MEADE M.R. and BABLER B.L.

Abstract (from CDS):

We have observed the central region of the infrared-dark cloud filament associated with IRAS 18507+0121 at millimeter wavelengths in CO(J=1-0), ^ 13^CO(J=1-0), and C18O(J=1-0) line emission and with Spitzer at mid-infrared wavelengths. Five massive outflows from two cloud cores were discovered. Three outflows are centered on or near an ultracompact (UC) H II region (G34.4+0.23), while the remaining two outflows originate from the millimeter core G34.4+0.23 MM. Modeling of the spectral energy distributions of the mid-infrared sources identified 31 young stellar objects in the filament with a combined stellar mass of ∼127±27 M☉. An additional 22 sources were identified as probable cluster members based on the presence of strong 24 µm emission. The total star formation efficiency in the G34.4 cloud filament is estimated to be ∼7%, while the massive and intermediate-mass star formation efficiency in the entire cloud filament is estimated to be roughly 2%. A comparison of the gravitational binding energy with the outflow kinetic energy suggests that the compact core containing G34.4+0.23 MM is being destroyed by its molecular outflows, whereas the outflows associated with the more massive core surrounding the G34.4 UC H II region are not likely to totally disrupt the cloud. In addition, a qualitative evaluation of the region appears to suggest that stars in this region may have formed in two stages: first lower mass stars formed and then, a few Myr later, the more massive stars began to form.

Abstract Copyright: ∼

Journal keyword(s): ISM: H II Regions - ISM: Molecules - Stars: Formation

Nomenclature: Table 3: [SPW2007] NN (Nos 1-54). Fig.3: [SPW2007] G34.4A (Nos G34.4A to G34.4E).

Simbad objects: 66

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Number of rows : 66
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 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
2 3C 345 Bla 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1808 3
3 2MASS J18531198+0127092 Y*O 18 53 11.9810460408 +01 27 09.301582584           ~ 2 0
4 SSTGLMC G034.4127+00.2550 Y*? 18 53 13.87 +01 26 03.3           ~ 1 0
5 [SPW2007] 34 Y*? 18 53 13.93 +01 24 46.7           ~ 1 0
6 [SPW2007] 35 Y*? 18 53 14.14 +01 25 03.8           ~ 1 0
7 [SPW2007] 36 Y*? 18 53 14.70 +01 25 25.0           ~ 1 0
8 [SPW2007] 37 Y*? 18 53 14.88 +01 25 49.0           ~ 1 0
9 SSTGLMC G034.4117+00.2478 Y*? 18 53 15.30 +01 25 48.1           ~ 1 0
10 [SPW2007] 39 Y*? 18 53 15.56 +01 23 25.2           ~ 1 0
11 2MASS J18531581+0127374 Y*O 18 53 15.81 +01 27 37.4           ~ 2 0
12 [SPW2007] 40 Y*? 18 53 16.03 +01 24 25.4           ~ 1 0
13 [SPW2007] 13 Y*O 18 53 16.53 +01 26 28.6           ~ 1 0
14 [SPW2007] 41 Y*? 18 53 16.81 +01 24 11.9           ~ 1 0
15 2MASS J18531683+0123265 Y*O 18 53 16.84 +01 23 26.5           ~ 2 0
16 [SPW2007] 42 Y*? 18 53 16.91 +01 26 32.0           ~ 2 0
17 2MASS J18531730+0126400 Y*O 18 53 17.3111917104 +01 26 39.772726944           ~ 3 0
18 SSTGLMC G034.4266+00.2460 Y*O 18 53 17.32 +01 26 33.0           ~ 2 0
19 GAL 034.4+00.23 HII 18 53 17.4 +01 24 55           ~ 93 1
20 2MASS J18531778+0123493 Y*O 18 53 17.78280 +01 23 49.3620           ~ 5 0
21 SPICY 93987 Y*O 18 53 17.785 +01 27 12.71           ~ 2 0
22 [SPW2007] G34.4B out 18 53 18.0 +01 25 25           ~ 1 0
23 [SPW2007] 43 Y*? 18 53 18.03 +01 26 25.9           ~ 1 0
24 AGAL G034.411+00.234 Y*O 18 53 18.0319 +01 25 25.500           ~ 108 0
25 [SPW2007] 44 Y*? 18 53 18.06 +01 23 24.8           ~ 1 0
26 [SPW2007] 45 Y*? 18 53 18.08 +01 26 12.0           ~ 1 0
27 2MASS J18531819+0127292 Y*O 18 53 18.19 +01 27 29.2           ~ 2 0
28 [SPW2007] 46 Y*? 18 53 18.41 +01 23 38.7           ~ 1 0
29 [SPW2007] 47 Y*? 18 53 18.52 +01 23 56.8           ~ 1 0
30 RAFGL 2271 SFR 18 53 18.54 +01 14 57.9           ~ 537 0
31 [SPW2007] 31 Y*O 18 53 18.59 +01 25 38.9           ~ 1 0
32 [SPW2007] 48 Y*? 18 53 18.59 +01 26 49.5           ~ 1 0
33 CXOU J185318.5+012738 Y*O 18 53 18.599 +01 27 38.87           ~ 2 0
34 [SPW2007] 49 Y*? 18 53 18.60 +01 23 46.2           ~ 1 0
35 2MASS J18531866+0123218 Y*O 18 53 18.66 +01 23 21.9           ~ 3 0
36 MSX5C G034.4037+00.2282 Y*O 18 53 18.66 +01 24 47.7           ~ 16 0
37 SPICY 94005 Y*O 18 53 18.723 +01 24 43.05           ~ 2 0
38 2MASS J18531879+0124194 Y*O 18 53 18.79776 +01 24 19.4904           ~ 3 0
39 2MASS J18531885+0128025 Y*O 18 53 18.85 +01 28 02.5           ~ 1 0
40 2MASS J18531885+0124116 Y*O 18 53 18.8600398056 +01 24 11.704771404           ~ 2 0
41 MSXDC G034.43+00.24 MoC 18 53 18.9 +01 26 39           ~ 122 0
42 [BT2009] F6 mm 18 53 19.0 +01 24 08           ~ 31 0
43 [SPW2007] G34.4D out 18 53 19.0 +01 24 35           ~ 1 0
44 2MASS J18531905+0128214 Y*O 18 53 19.05 +01 28 21.4           ~ 2 0
45 [SPW2007] 32 Y*? 18 53 19.14 +01 24 35.4           ~ 1 0
46 SPICY 94016 Y*O 18 53 19.399 +01 28 16.09           ~ 2 0
47 SPICY 94018 Y*O 18 53 19.401 +01 24 24.20           ~ 2 0
48 SPICY 94021 Y*O 18 53 19.691 +01 23 36.24           ~ 3 0
49 [SPW2007] 50 Y*? 18 53 19.90 +01 28 08.6           ~ 2 0
50 [SPW2007] 27 Y*O 18 53 20.01 +01 28 19.6           ~ 3 0
51 SPICY 94025 Y*O 18 53 20.071 +01 28 43.15           ~ 2 0
52 AGAL G034.459+00.247 Y*O 18 53 20.4 +01 28 23           ~ 71 0
53 [SPW2007] 29 Y*O 18 53 20.67 +01 28 24.1           ~ 3 0
54 [SPW2007] 9 Y*O 18 53 21.13 +01 24 27.5           ~ 1 0
55 [SPW2007] 51 Y*? 18 53 21.23 +01 25 12.2           ~ 1 0
56 [SPW2007] 17 Y*O 18 53 21.57 +01 26 58.9           ~ 1 0
57 2MASS J18532277+0122306 Y*? 18 53 22.77 +01 22 30.7           ~ 1 0
58 [SPW2007] 53 Y*? 18 53 22.83 +01 25 10.0           ~ 1 0
59 [SPW2007] 54 Y*? 18 53 22.90 +01 25 07.0           ~ 1 0
60 2MASS J18532338+0127570 Y*O 18 53 23.38 +01 27 57.0           ~ 2 0
61 [SPW2007] 24 Y*O 18 53 23.78 +01 28 01.1           ~ 1 0
62 2MASS J18532500+0123012 Y*O 18 53 25.01 +01 23 01.2           ~ 1 0
63 SPICY 94099 Y*O 18 53 29.806 +01 26 52.81           ~ 2 0
64 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
65 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
66 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2

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