Site Map
Contacts
Follow us on Facebook Follow us on Twitter YouTube channel
Centro de Astrofísica da Universidade do Porto

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

Á. Sánchez-Monge, R. Cesaroni, M. T. Beltrán, 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, Page L10_1
April 2013

>> ADS>> DOI

Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

Proceed on CAUP's website|Go to IA website