2012A&A...542L..15W


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST17:11:37

2012A&A...542L..15W - Astronomy and Astrophysics, volume 542, L15-15 (2012/6-1)

Terahertz ammonia absorption as a probe of infall in high-mass star forming clumps.

WYROWSKI F., GUESTEN R., MENTEN K.M., WIESEMEYER H. and KLEIN B.

Abstract (from CDS):

Cloud contraction and infall are the fundamental processes of star formation. While ``blue-skewed'' line profiles observed in high-mass star forming regions are commonly taken as evidence of infall by an ever increasing number of studies, their interpretation offers many pitfalls. Detecting infall via redshifted absorption in front of continuum sources is a much more direct and reliable method but so far mostly restricted toward absorption in the centimeter toward strong HII regions. Here we present a novel approach by probing absorption of rotational ammonia transitions in front of the strong dust emission of massive star-forming regions. A carefully selected sample of three regions with different stages of evolution is selected to study infall through the evolution of massive star-forming clumps. Redshifted absorption is detected toward all three sources and infall rates between 3-10x10–3M/yr are derived.

Abstract Copyright:

Journal keyword(s): Stars: formation - ISM: molecules - ISM: kinematics and dynamics

Simbad objects: 7

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Number of rows : 7

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 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1035 1
2 SNR G010.6-00.4 SNR 18 10 28 -19 55.8           ~ 56 0
3 GAL 024.78+00.08 HII 18 36.2 -07 13           ~ 73 0
4 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 312 0
5 [MSL2003] W43-MM1 cor 18 47 47.0 -01 54 28           ~ 95 0
6 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 460 0
7 W 51 SNR 19 23 50 +14 06.0           ~ 1143 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-17:11:37

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