Volume 552, April 2013
|Number of page(s)||5|
|Published online||12 April 2013|
A candidate circumbinary Keplerian disk in G35.20–0.74 N: A study with ALMA
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5,
2 Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
3 ESO, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
4 SOFIA Science Center, NASA Ames Research Center, Mailstop 232-12, Moffett Field, CA 94035, USA
5 Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK
6 Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
7 Universitäts-Sternwarte München, Ludwig-Maximilians-Universität, Scheinerstrasse 1, 81679 München, Germany
8 SRON Netherlands Institute for Space Research, PO Box 800, 9700 AV Groningen, The Netherlands
9 Kapteyn Astronomical Institute, University of Groningen, 9700 AV Groningen, The Netherlands
10 Department of Earth and Space Science, Indian Institute of Space Science and Technology, Thiruvananthapuram, 695 547 Kerala, India
11 Dublin Institute for Advanced Studies (DIAS), 31 Fitzwilliam Place, Dublin 2, Ireland
12 Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
Received: 19 January 2013
Accepted: 15 March 2013
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.
Key words: stars: formation / ISM: individual objects: G35.20-0.74N / ISM: jets and outflows
© ESO, 2013
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