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Nature of the Dusty S-cluster Object (DSO/G2): Pre-main-sequence star with non-spherical dusty envelope

Published online by Cambridge University Press:  09 February 2017

M. Zajaček ,
M. Valencia-S. ,
B. Shahzamanian ,
F. Peissker ,
A. Eckart  and
M. Parsa
M. Zajaček
Affiliation:
Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany email: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected] MPIfR, Auf dem Hügel 69, D-53121 Bonn, Germany
M. Valencia-S.
Affiliation:
Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany email: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
B. Shahzamanian
Affiliation:
Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany email: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
F. Peissker
Affiliation:
Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany email: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
A. Eckart
Affiliation:
Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany email: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected] MPIfR, Auf dem Hügel 69, D-53121 Bonn, Germany
M. Parsa
Affiliation:
Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany email: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected] MPIfR, Auf dem Hügel 69, D-53121 Bonn, Germany
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Abstract

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Near-infrared observations reveal several infrared-excess sources near the Galactic Centre with emission lines present in their spectra. One of these objects, DSO/G2, which moves around the supermassive black hole (Sgr A*) on a highly eccentric orbit, passed the pericentre at approximately 160 AU in 2014. It remained compact, which implies that at least in this case it is a star embedded in a dusty envelope. The spectral energy distribution and the detection of polarized continuum emission indicate that it is probably a pre-main-sequence star surrounded by a dense envelope with bipolar cavities. In addition, the star associated with DSO/G2 plausibly develops a bow shock due to its supersonic motion. The model of the star surrounded by the non-spherical dusty envelope can reproduce the main characteristics of the DSO/G2 source: 1. spectral energy distribution in near-infrared bands; 2. linear polarization in Ks band; and 3. the overall compact behaviour.

Keywords

Galaxy: centerradiative transferpolarizationstars: pre–main-sequence
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S322: The Multi-Messenger Astrophysics of the Galactic Centre , July 2016 , pp. 231 - 232
Copyright
Copyright © International Astronomical Union 2017 

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