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

astro-ph.GA

/ Authors

A. Sanchez-Monge, R. Cesaroni, M. T. Beltran, M. S. N. Kumar, T. Stanke, H. Zinnecker, S. Etoka, D. Galli, C. A. Hummel, L. Moscadelli

and 6 more authors

T. Preibisch, T. Ratzka, F. F. S. van der Tak, S. Vig, C. M. Walmsley, K. -S. Wang

/ Abstract

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, such as CH3CN, which 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 Msun. This finding is consistent with the results of a recent study of the CO first overtone bandhead emission at 2.3mum towards G35.20-0.74 N. The disk radius and mass are >2500 au and 3 Msun. To reconcile the observed bolometric luminosity (3x10^4 Lsun) with the estimated stellar mass of 18 Msun, we propose that the latter is the total mass of a binary system.