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

Ń. SŠnchez-Monge, R. Cesaroni, M. T. BeltrŠn, M. S. N. Kumar, T. Stanke, H. Zinnecker, S. Etoka, D. Galli, C. A. Hummel, L. Moscadelli, 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 (e.g., CH3CN) 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 µm towards G35.20–0.74 N. The disk radius and mass are ≳2500 au and ~3 M. To reconcile the observed bolometric luminosity (~3×104 L) with the estimated stellar mass of 18 M, we propose that the latter is the total mass of a binary system.

Keywords
stars: formation – ISM: individual objects: G35.20-0.74N – ISM: jets and outflows

Notes
Estimate taken from the rms database, available at http://www.ast.leeds.ac.uk/cgi-bin/RMS/RMS_DATABASE.cgi

Astronomy and Astrophysics
Volume 552, Number of pages L10_1
2013 April

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Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia