Query : 2003A&A...407..225O

2003A&A...407..225O - Astronomy and Astrophysics, volume 407, 225-235 (2003/8-3)

High resolution observations of the hot core in G29.96-0.02.


Abstract (from CDS):

We present high angular resolution observations obtained with the Owens Valley and the IRAM Plateau de Bure millimeter-wave interferometers toward the hot core in G29.96-0.02. We observed the ground state CH3CN(6-5), CH313CN(6-5), vibrationally excited (v8=1) CH3CN(6-5), and the C18O(1-0) rotational transitions, as well as the 2.7mm continuum emission. Our continuum maps show evidence of a compact source barely resolved whose diameter we estimate to be about 0.06pc and whose emission mechanism is dominated by thermal emission from warm dust. Both the ground state and the v8=1 methyl cyanide lines, as well as other serendipituosly detected molecular transitions, arise from a compact source at the same position as the 2.7mm continuum emission. The C18O observations sample the structure and kinematics of the molecular surroundings of the hot core and from the C18O data we estimate a gas mass of about 1.1x103M in a region with a diameter of 0.32pc, corresponding to an average number density of about 106cm–3. Our data show evidence of both a temperature and density gradient in the hot core and its molecular surroundings. The density gradient, in particular, is consistent with the infalling scenario suggested by the presence of an East-West oriented velocity gradient, which is however of opposite sign in CH3CN and C18O. We tentatively interpret the C18O velocity gradient as associated with infall, whereas the CH3CN gradient, consistent with that measured in NH3 by Cesaroni et al. (1998A&A...331..709C), is likely to trace a massive rotating disk.

Abstract Copyright:

Journal keyword(s): stars: formation - radio lines: ISM - ISM: individual objects: G29.96-0.02 - ISM: molecules

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5653 1
2 QSO B1730-130 QSO 17 33 02.70578907 -13 04 49.5482119   18 19.50 18.78 17.39 ~ 1094 1
3 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 904 1
4 CORNISH G029.9559-00.0168 Y*O 18 46 04.18 -02 39 21.3           ~ 362 0
5 IRAS 18449-0115 cor 18 47 34.29 -01 12 44.5           ~ 369 0
6 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 424 0

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