Beltran, M. T., Cesaroni, R., Rivilla, V. M., Sanchez-Monge, A., Moscadelli, L., Ahmadi, A., Allen, V., Beuther, H., Etoka, S., Galli, D., Galvan-Madrid, R., Goddi, C., Johnston, K. G., Klaassen, P. D., Koelligan, A., Kuiper, R., Kumar, M. S. N., Maud, L. T., Mottram, J. C., Peters, T., Schilke, P., Testi, L., van der Tak, F. and Walmsley, C. M. (2018). Accelerating infall and rotational spin-up in the hot molecular core G31.41+0.31. Astron. Astrophys., 615. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

Full text not available from this repository.

Abstract

As part of our effort to search for circumstellar disks around high-mass stellar objects, we observed the well-known core G31.41+0.31 with ALMA at 1.4mm with an angular resolution of similar to 0.'' 22 (similar to 1700 au). The dust continuum emission has been resolved into two cores namely Main and NE. The Main core, which has the stronger emission and is the more chemically rich, has a diameter of similar to 5300 au, and is associated with two free-free continuum sources. The Main core looks featureless and homogeneous in dust continuum emission and does not present any hint of fragmentation. Each transition of CH3CN and CH3OCHO, both ground and vibrationally excited, as well as those of CH3CN isotopologues, shows a clear velocity gradient along the NE-SW direction, with velocity linearly increasing with distance from the center, consistent with solid-body rotation. However, when comparing the velocity field of transitions with different upper level energies, the rotation velocity increases with increasing energy of the transition, which suggests that the rotation speeds up toward the center. Spectral lines towardtoward the dust continuum peak show an inverse P-Cygni profile that supports the existence of infall in the core. The infall velocity increases with the energy of the transition suggesting that the infall is accelerating toward the center of the core, consistent with gravitational collapse. Despite the monolithic appearance of the Main core, the presence of red-shifted absorption, the existence of two embedded free-free sources at the center, and the rotational spin-up are consistent with an unstable core undergoing fragmentation with infall and differential rotation due to conservation of angular momentum. Therefore, the most likely explanation for the monolithic morphology is that the large opacity of the dust emission prevents the detection of any inhomogeneity in the core.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Beltran, M. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cesaroni, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rivilla, V. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Monge, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moscadelli, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ahmadi, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Allen, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beuther, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Etoka, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Galli, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Galvan-Madrid, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goddi, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Johnston, K. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klaassen, P. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Koelligan, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuiper, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kumar, M. S. N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Maud, L. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mottram, J. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Peters, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Testi, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van der Tak, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Walmsley, C. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-179358
DOI: 10.1051/0004-6361/201832811
Journal or Publication Title: Astron. Astrophys.
Volume: 615
Date: 2018
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MASSIVE STAR-FORMATION; RADIATION PRESSURE; ACCRETION; EMISSION; CH3CN; GLYCOLALDEHYDE; EVOLUTION; COLLAPSE; OUTFLOWS; REGIONSMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/17935

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item