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Detection of polarized continuum emission of the Dusty S-cluster Object (DSO/G2)

Published online by Cambridge University Press:  09 February 2017

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

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A peculiar source in the Galactic center known as the Dusty S-cluster Object (DSO/G2) moves on a highly eccentric orbit around the supermassive black hole with the pericenter passage in the spring of 2014. Its nature has been uncertain mainly because of the lack of any information about its intrinsic geometry. For the first time, we use near-infrared polarimetric imaging data to obtain constraints about the geometrical properties of the DSO. We find out that DSO is an intrinsically polarized source, based on the significance analysis of polarization parameters, with the degree of the polarization of ~30% and an alternating polarization angle as it approaches the position of Sgr A*. Since the DSO exhibits a near-infrared excess of Ks-L′ > 3 and remains rather compact in emission-line maps, its main characteristics may be explained with the model of a pre-main-sequence star embedded in a non-spherical dusty envelope.

Keywords

Galaxy: centerpolarizationstars: 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. 233 - 234
Copyright
Copyright © International Astronomical Union 2017 

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