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.
@article{arxiv.1303.4242,
title = {A candidate circumbinary Keplerian disk in G35.20-0.74 N: A study with ALMA},
author = {A. Sanchez-Monge and R. Cesaroni and M. T. Beltran and M. S. N. Kumar and T. Stanke and H. Zinnecker and S. Etoka and D. Galli and C. A. Hummel and L. Moscadelli and T. Preibisch and T. Ratzka and F. F. S. van der Tak and S. Vig and C. M. Walmsley and K. -S. Wang},
journal= {arXiv preprint arXiv:1303.4242},
year = {2015}
}
Comments
5 pages, 4 figures, accepted for publication in Astronomy and Astrophysics Letters