Beltran, M. T., Sanchez-Monge, A., Cesaroni, R., Kumar, M. S. N., Galli, D., Walmsley, C. M., Etoka, S., Furuya, R. S., Moscadelli, L., Stanke, T., van der Tak, F. F. S., Vig, S., Wang, K. -S., Zinnecker, H., Elia, D. and Schisano, E. (2014). Filamentary structure and Keplerian rotation in the high-mass star-forming region G35.03+0.35 imaged with ALMA. Astron. Astrophys., 571. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746
Full text not available from this repository.Abstract
Context. Theoretical scenarios propose that high-mass stars are formed by disk-mediated accretion. Aims. To test the theoretical predictions on the formation of massive stars, we wish to make a thorough study at high-angular resolution of the structure and kinematics of the dust and gas emission toward the high-mass star-forming region G35.03+0.35, which harbors a disk candidate around a B-type (proto) star. Methods. We carried out ALMA Cycle 0 observations at 870 mu m of dust of typical high-density, molecular outflow, and cloud tracers with resolutions of < 0.5. Complementary Subaru COMICS 25 mu m observations were carried out to trace the mid-infrared emission toward this star-forming region. Results. The submillimeter continuum emission has revealed a filamentary structure fragmented into six cores, called A-F. The filament could be in quasi-equilibrium taking into account that the mass per unit length of the filament, 200-375 M-circle dot/pc, is similar to the critical mass of a thermally and turbulently supported infinite cylinder, similar to 335 M-circle dot/pc. The cores, which are on average separated by similar to 0.02 pc, have deconvolved sizes of 1300-3400 AU, temperatures of 35-240 K, H-2 densities > 10(7) cm(-3), and masses in the range 1-5 M-circle dot, and they are subcritical. Core A, which is associated with a hypercompact HII region and could be the driving source of the molecular outflow observed in the region, is the most chemically rich source in G35.03+0.35 with strong emission of typical hot core tracers such as CH3CN. Tracers of high density and excitation show a clear velocity gradient along the major axis of the core, which is consistent with a disk rotating about the axis of the associated outflow. The PV plots along the SE-NW direction of the velocity gradient show clear signatures of Keplerian rotation, although infall could also be present, and they are consistent with the pattern of an edge-on Keplerian disk rotating about a star with a mass in the range 5-13 M-circle dot. The high t(ff)/t(rot) ratio for core A suggests that the structure rotates fast and that the accreting material has time to settle into a centrifugally supported disk. Conclusions. G35.03+0.35 is one of the most convincing examples of Keplerian disks rotating about high-mass (proto) stars. This supports theoretical scenarios according to which high-mass stars, at least B-type stars, would form through disk-mediated accretion.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Creators: |
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| URN: | urn:nbn:de:hbz:38-423790 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.1051/0004-6361/201424031 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | Astron. Astrophys. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Volume: | 571 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Date: | 2014 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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: |
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| URI: | http://kups.ub.uni-koeln.de/id/eprint/42379 |
Downloads
Downloads per month over past year
Altmetric
Export
Actions (login required)
 |
View Item |