Universität zu Köln

Suri, S., Beuther, H., Gieser, C., Ahmadi, A., Sanchez-Monge, A., Winters, J. M., Linz, H., Henning, Th, Beltran, M. T., Bosco, F., Cesaroni, R., Csengeri, T., Feng, S., Hoare, M. G., Johnston, K. G., Klaassen, P., Kuiper, R., Leurini, S., Longmore, S., Lumsden, S., Maud, L., Moscadelli, L., Moeller, T., Palau, A., Peters, T., Pudritz, R. E., Ragan, S. E., Semenov, D., Schilke, P., Urquhart, J. S., Wyrowski, F. and Zinnecker, H. (2021). Disk fragmentation in high-mass star formation High-resolution observations towards AFGL 2591-VLA 3. Astron. Astrophys., 655. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. Increasing evidence suggests that, similar to their low-mass counterparts, high-mass stars form through a disk-mediated accretion process. At the same time, formation of high-mass stars still necessitates high accretion rates, and hence, high gas densities, which in turn can cause disks to become unstable against gravitational fragmentation. Aims. We study the kinematics and fragmentation of the disk around the high-mass star forming region AFGL 2591-VLA 3 which was hypothesized to be fragmenting based on the observations that show multiple outflow directions. Methods. We use a new set of high-resolution (0'.'19) IRAM/NOEMA observations at 843 mu m towards VLA 3 which allow us to resolve its disk, characterize the fragmentation, and study its kinematics. In addition to the 843 mu m continuum emission, our spectral setup targets warm dense gas and outflow tracers such as HCN, HC3N and SO2, as well as vibrationally excited HCN lines. Results. The high resolution continuum and line emission maps reveal multiple fragments with subsolar masses within the inner similar to 1000 AU of VLA 3. Furthermore, the velocity field of the inner disk observed at 843 mu m shows a similar behavior to that of the larger scale velocity field studied in the CORE project at 1.37 mm. Conclusions. We present the first observational evidence for disk fragmentation towards AFGL 2591-VLA 3, a source that was thought to be a single high-mass core. While the fragments themselves are low-mass, the rotation of the disk is dominated by the protostar with a mass of 10.3 +/- 1.8 M-circle dot. These data also show that NOEMA Band 4 can obtain the highest currently achievable spatial resolution at (sub-)mm wavelengths in observations of strong northern sources.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Suri, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beuther, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gieser, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ahmadi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Monge, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Winters, J. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Linz, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Henning, Th UNSPECIFIED UNSPECIFIED UNSPECIFIED Beltran, M. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bosco, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cesaroni, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Csengeri, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Feng, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hoare, M. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Johnston, K. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klaassen, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuiper, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Leurini, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Longmore, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lumsden, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Maud, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moscadelli, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moeller, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palau, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Peters, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pudritz, R. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ragan, S. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Semenov, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilke, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Urquhart, J. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wyrowski, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zinnecker, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-606271
DOI:	10.1051/0004-6361/202140963
Journal or Publication Title:	Astron. Astrophys.
Volume:	655
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:	Keywords Language THERMAL JEANS FRAGMENTATION; KEPLERIAN DISK; WATER MASERS; STELLAR; SUBMILLIMETER; DUST; MILLIMETER; RADIATION; FILAMENT; EMISSION Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/60627