2010A&A...519A..35C


Query : 2010A&A...519A..35C

2010A&A...519A..35C - Astronomy and Astrophysics, volume 519, A35-35 (2010/9-1)

G30.79 FIR 10: a gravitationally bound infalling high-mass star-forming clump.

CORTES P.C., PARRA R., CORTES J.R. and HARDY E.

Abstract (from CDS):

The process of high-mass star formation is still shrouded in controversy. Models are still tentative and current observations are just beginning to probe the densest inner regions of giant molecular clouds. The study of high-mass star formation requires the observation and analysis of high-density gas. This can be achieved by the detection of emission from higher rotational transitions of molecules in the sub-millimeter. Here, we studied the high-mass clump G30.79 FIR 10 by observing molecular emission in the 345GHz band. The goal is to understand the gravitational state of this clump, considering turbulence and magnetic fields, and to study the kinematics of dense gas. We approached this region by mapping the spatial distribution of HCO+(J=4->3), H13CO+(J=4->3), CS(J=7->6), 12CO(J=3->2), and 13CO(J=3->2) molecular emission by using the ASTE telescope and by observing the 12C18O(J=3->2), HCN(J=4->3), and H13CN(J=4->3) molecular transitions with the APEX telescope. Infalling motions were detected and modeled toward this source. A mean infall velocity of 0.5km/s with an infall mass rate of 5x10–3M/yr was obtained. Also, a previously estimated value for the magnetic field strength in the plane of the sky was refined to be 855µG which we used to calculate a mass-to-magnetic flux ratio, λ=1.9, or super-critical. The virial mass from turbulent motions was also calculated finding Mvir=563M, which gives a ratio of Msubmm/Mvir=5.9. Both values strongly suggest that this clump must be in a state of gravitational collapse. Additionally, we estimated the HCO+ abundance, obtaining X(HCO+)= 2.4x10–10.

Abstract Copyright:

Journal keyword(s): magnetic fields - stars: formation - ISM: individual objects: G30.79 FIR 10

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 [DBS2003] 127 cor 10 38 33 -58 19.3           ~ 25 0
2 GAL 305.20+00.2 bub 13 11 35.1 -62 33 26           ~ 39 0
3 W 31 SFR 18 10 28.6 -19 55 51           ~ 252 0
4 NAME M 17 SW SFR 18 20 23.1 -16 11 43           ~ 265 0
5 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 495 0
6 AGAL G030.818-00.056 cor 18 47 47.0 -01 54 28           ~ 144 0
7 V* R Aql OH* 19 06 22.2510922392 +08 13 48.012661776 8.06 7.69 6.09     M6.5-9e 550 0
8 LDN 663 DNe 19 36 55 +07 34.4           ~ 608 0

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2022.11.26-20:30:13

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