Beuther, H., Gieser, C., Suri, S., Linz, H., Klaassen, P., Semenov, D., Winters, J. M., Henning, Th., Soler, J. D., Urquhart, J. S., Syed, J., Feng, S., Moeller, T., Beltran, M. T., Sanchez-Monge, A., Longmore, S. N., Peters, T., Ballesteros-Paredes, J., Schilke, P., Moscadelli, L., Palau, A., Cesaroni, R., Lumsden, S., Pudritz, R., Wyrowski, F., Kuiper, R. and Ahmadi, A. (2021). Fragmentation and kinematics in high-mass star formation CORE-extension targeting two very young high-mass star-forming regions. Astron. Astrophys., 649. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

Full text not available from this repository.

Abstract

Context. The formation of high-mass star-forming regions from their parental gas cloud and the subsequent fragmentation processes lie at the heart of star formation research. Aims. We aim to study the dynamical and fragmentation properties at very early evolutionary stages of high-mass star formation. Methods. Employing the NOrthern Extended Millimeter Array and the LRAM 30 m telescope, we observed two young high-mass star-forming regions, ISOSS22478 and ISOSS23053, in the 1.3 mm continuum and spectral line emission at a high angular resolution (similar to 0.8 ''). Results. We resolved 29 cores that are mostly located along filament-like structures. Depending on the temperature assumption, these cores follow a mass-size relation of approximately M proportional to r(2.0 +/- 0.3) corresponding to constant mean column densities. However, with different temperature assumptions, a steeper mass-size relation up to M proportional to r(2.0 +/- 0.3) which would be more likely to correspond to constant mean volume densities, cannot be ruled out. The correlation of the core masses with their nearest neighbor separations is consistent with thermal Jeans fragmentation. We found hardly any core separations at the spatial resolution limit, indicating that the data resolve the large-scale fragmentation well. Although the kinematics of the two regions appear very different at first sight - multiple velocity components along filaments in ISOSS22478 versus a steep velocity gradient of more than 50 km s(-1) pc(-1) in ISOSS23053 - the findings can all be explained within the framework of a dynamical cloud collapse scenario. Conclusions. While our data are consistent with a dynamical cloud collapse scenario and subsequent thermal Jeans fragmentation, the importance of additional environmental properties, such as the magnetization of the gas or external shocks triggering converging gas flows, is nonetheless not as well constrained and would require future investigation.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Beuther, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gieser, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Suri, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Linz, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klaassen, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Semenov, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Winters, J. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Henning, Th.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Soler, J. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Urquhart, J. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Syed, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Feng, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moeller, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beltran, M. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Monge, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Longmore, S. N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Peters, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ballesteros-Paredes, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moscadelli, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Palau, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cesaroni, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lumsden, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pudritz, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wyrowski, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuiper, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ahmadi, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-603298
DOI: 10.1051/0004-6361/202040106
Journal or Publication Title: Astron. Astrophys.
Volume: 649
Date: 2021
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
THERMAL JEANS FRAGMENTATION; ALMA OBSERVATIONS; DENSE CORES; HIERARCHICAL FRAGMENTATION; DYNAMICAL COLLAPSE; EARLIEST PHASES; FILAMENTS; II.; ACCRETION; SUBMILLIMETERMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/60329

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item