2012ApJ...756...10L


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.22CEST09:50:12

2012ApJ...756...10L - Astrophys. J., 756, 10 (2012/September-1)

Fragmentation and OB star formation in high-mass molecular hub-filament systems.

LIU H.B., JIMENEZ-SERRA I., HO P.T.P., CHEN H.-R., ZHANG Q. and LI Z.-Y.

Abstract (from CDS):

Filamentary structures are ubiquitously seen in the interstellar medium. The concentrated molecular mass in the filaments allows fragmentation to occur in a shorter timescale than the timescale of the global collapse. Such hierarchical fragmentation may further assist the dissipation of excessive angular momentum. It is crucial to resolve the morphology and the internal velocity structures of the molecular filaments observationally. We perform 0".5-2".5 angular resolution interferometric observations toward the nearly face-on OB cluster-forming region G33.92+0.11. Observations of various spectral lines, as well as the millimeter dust continuum emission, consistently trace several ∼1 pc scale, clumpy molecular arms. Some of the molecular arms geometrically merge to an inner 3.0^ + 2.8^_- 1.4_x103 M, 0.6 pc scale central molecular clump, and may directly channel the molecular gas to the warm (∼50 K) molecular gas immediately surrounding the centrally embedded OB stars. The NH3 spectra suggest a medium turbulence line width of FWHM ≲ 2 km/s in the central molecular clump, implying a ≳ 10 times larger molecular mass than the virial mass. Feedbacks from shocks and the centrally embedded OB stars and localized (proto)stellar clusters likely play a key role in the heating of molecular gas and could lead to the observed chemical stratification. Although (proto)stellar feedbacks are already present, G33.92+0.11 chemically appears to be at an early evolutionary stage given by the low abundance limit of SO2 observed in this region.

Abstract Copyright:

Journal keyword(s): evolution - ISM: individual: G33.92+0.11 - stars: formation

Simbad objects: 37

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Number of rows : 37

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 W 3(H2O) Mas 02 27 04.6 +61 52 25           ~ 128 0
2 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3652 3
3 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2081 1
4 M 42 HII 05 35 17.3 -05 23 28           ~ 3804 0
5 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 762 0
6 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 673 2
7 IRAS 07427-2400 mul 07 44 51.9 -24 07 41           ~ 55 0
8 WISE J074451.99-240742.1 mul 07 44 51.997 -24 07 42.11           ~ 64 0
9 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5452 1
10 3C 279 Bla 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2792 2
11 MSXDC G304.74+1.32 DNe 13 06.6 -61 30           ~ 9 0
12 W 31c HII 18 10 29.1 -19 56 05           ~ 310 0
13 W 33a Y*O 18 14 39.0 -17 52 03           ~ 596 0
14 OH 20.1 -0.1 SFR 18 28 10.3918 -11 28 44.164           ~ 108 0
15 GAL 024.78+00.08 HII 18 36.2 -07 13           ~ 75 0
16 NAME Dragon Nebula DNe 18 42 50.6 -04 03 30           ~ 124 0
17 AGAL G028.398+00.081 cor 18 42 51.86 -03 59 43.3           ~ 45 0
18 [BMC2020] IRDC-C9 Main Core smm 18 42 51.98 -03 59 54.0           ~ 4 0
19 [BMC2020] IRDC-C9 Main Tail smm 18 42 52.12 -03 59 54.2           ~ 4 0
20 GAL 028.20-00.04 HII 18 42 58.2 -04 14 05           ~ 52 0
21 [CKW87] 184135.6-042104 HII 18 44 14.3 -04 17 57           ~ 10 0
22 GAL 029.96-00.02 Y*O 18 46 03.7 -02 39 21           ~ 339 1
23 SDC G30.895+0.134 DNe 18 47 14.61 -01 45 03.3           ~ 8 0
24 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 326 0
25 [WWB83] G033.91+0.11 HII 18 52 50.4 +00 55 29           ~ 91 1
26 GAL 035.58-00.03 reg 18 56 23.5 +02 20 38           ~ 33 1
27 MSXDC G035.39-0.33 MoC 18 57 09.0 +02 07 46           ~ 96 0
28 SNR G035.2-01.8 SNR 19 01.6 +01 14           ~ 148 0
29 [BNM96] 043.793-0.125 Y*O 19 11 54.016 +09 35 49.46           ~ 64 2
30 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 659 1
31 IRAS 20293+3952 HII 20 31 11.040 +40 03 10.69           ~ 69 0
32 [MBS2007c] CygX-N44 Rad 20 39 01.01 +42 22 50.2           ~ 368 0
33 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 973 0
34 HH 375 Y*O 20 39 06.2 +68 02 15           ~ 168 0
35 3C 454.3 Bla 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2586 2
36 NGC 7538S Y*O 23 13 44.8 +61 26 51           ~ 79 1
37 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 380 3

    Equat.    Gal    SGal    Ecl

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2021.06.22-09:50:12

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