A candidate circumbinary Keplerian disk in G35.20-0.74 N: A study with ALMA

Sánchez-Monge, Á.; Cesaroni, R.; Beltrán, M.; Kumar, M.; Stanke, T.; Zinnecker, H.; ... ; Wang, K. (2013)

Article / Letter to editor

We report on ALMA observations of continuum and molecular line emission with 0.''4 resolution towards the high-mass star-forming region G35.20-0.74 N. Two dense cores are detected in typical hot-core tracers (e.g., CH$_{3}$CN) that reveal velocity gradients. In one of these cores, the velocity field can be fitted with an almost edge-on Keplerian disk rotating about a central mass of ~{}18 M$_{⊙}$. This finding is consistent with the results of a recent study of the CO first overtone bandhead emission at 2.3 {$μ$}m towards G35.20-0.74 N. The disk radius and mass are {gsim}2500 au and ~{}3 M$_{⊙}$. To reconcile the observed bolometric luminosity (~{}3 { imes} 10$^{4}$ L$_{⊙}$) with the estimated stellar mass of 18 M$_{⊙}$, we propose that the latter is the total mass of a binary system.

• All authors: Sánchez-Monge, Á.; Cesaroni, R.; Beltrán, M.; Kumar, M.; Stanke, T.; Zinnecker, H.; Etoka, S.; Galli, D.; Hummel, C.; Moscadelli, L.; Preibisch, T.; Ratzka, T.; Tak, F.; Vig, S.; Walmsley, C.; Wang, K.
• Date: 2013
• Journal: Astronomy & Astrophysics
• Volume: 552
• Pages: L10
• DOI: doi:10.1051/0004-6361/201321134
• Link: http://adsabs.harvard.edu/abs/2013A&A...552L..10S