2009A&A...499..811L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:58:51

2009A&A...499..811L - Astronomy and Astrophysics, volume 499, 811-825 (2009/6-1)

Molecular outflows towards O-type young stellar objects.

LOPEZ-SEPULCRE A., CODELLA C., CESARONI R., MARCELINO N. and WALMSLEY C.M.

Abstract (from CDS):

The formation of massive stars is not well-understood and requires detailed observational studies in order to discriminate between the different proposed star formation models. We have searched for massive molecular outflows in a sample of high-mass star forming regions, and we have characterised both the outflow properties and those of their associated molecular clumps. With a sample composed largely of more luminous objects than previous ones, this work complements analogous surveys performed by other authors by adding the missing highest luminosity sources. The sample under study has been selected so as to favour the earliest evolutionary phases of star formation, and is composed of very luminous objects (Lbol>2x104L and up to ∼106L), possibly containing O-type stars. Each source has been mapped in 13CO(2-1) (an outflow tracer) and C18O(2-1) (an ambient gas tracer) with the IRAM-30m telescope on Pico Veleta (Spain). The whole sample shows high-velocity wings in the 13CO(2-1) spectra, indicative of outflowing motions. In addition, we have obtained outflow maps in 9 of our 11 sources, which display well-defined blue and/or red lobes. For these sources, the outflow parameters have been derived from the line wing 13CO(2-1) emission. An estimate of the clump masses from the C18O(2-1) emission is also provided and found to be comparable to the virial masses. From a comparison between our results and those found by other authors at lower masses, it is clear that the outflow mechanical force increases with the bolometric luminosity of the clump and with the ionising photon rate of the associated Hii regions, indicating that high-mass stars drive more powerful outflows. A tight correlation between outflow mass and clump mass is also found. Molecular outflows are found to be as common in massive star forming regions as in low-mass star forming regions. This, added to the detection of a few tentative large-scale rotating structures suggests that high-mass stars may generally form via accretion, as low-mass stars.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: clouds - ISM: jets and outflows - ISM: molecules

Simbad objects: 18

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Number of rows : 18

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 [WC89] 010.47+0.03B HII 18 08 38.18 -19 51 50.2           ~ 5 0
2 [GRM93] G10.46+0.03 B HII 18 08 38.24 -19 51 50.2           ~ 4 0
3 GAL 010.47+00.03 HII 18 08 38.4 -19 51 52           ~ 109 0
4 [WC89] 010.47+0.03A cor 18 08 38.5080 -19 51 54.497           ~ 18 1
5 W 31c HII 18 10 29.1 -19 56 05           ~ 301 0
6 IRAS 18182-1433 mul 18 21 07.9 -14 31 53           ~ 95 0
7 OH 16.59 -0.05 cor 18 21 09.2137 -14 31 45.484           ~ 116 0
8 GAL 019.61-00.23 HII 18 27 38.0 -11 56 42           ~ 139 0
9 GAL 023.44-00.18 HII 18 34 43.6 -08 32 25           ~ 48 0
10 GAL 024.78+00.08 HII 18 36.2 -07 13           ~ 73 0
11 Caswell OH 028.86+00.07 Mas 18 43 48.1 -03 35 31           ~ 15 0
12 GAL 029.96-00.02 Y*O 18 46 03.7 -02 39 21           ~ 331 1
13 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 312 0
14 GAL 035.2-00.74 MoC 18 58 13 +01 40.6           ~ 152 0
15 IRAS 18556+0136 mul 18 58 13.1 +01 40 35           ~ 133 0
16 GAL 043.89-00.78 HII 19 14 26.16 +09 22 34.0           ~ 49 0
17 GAL 048.61+00.02 HII 19 20 31.3 +13 55 24           ~ 51 0
18 NAME Cygnus 2N HII 20 21 44.1 +37 26 40           ~ 110 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-21:58:52

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