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The infrared K-band identification of the DSO/G2 source from VLT and Keck data

Published online by Cambridge University Press:  22 May 2014

A. Eckart
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
M. Horrobin
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de
S. Britzen
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
M. Zamaninasab
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
K. Mužić
Affiliation:
ESO, Alonso de Cordova 3107, Vitacura, Casilla 19, Santiago, 19001, Chile
N. Sabha
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
B. Shahzamanian
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
S. Yazici
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de
L. Moser
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de
M. García-Marin
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de
M. Valencia-S.
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de
A. Borkar
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
M. Bursa
Affiliation:
Astronomical Institute, Academy of Sciences, CZ-14131 Prague, Czech Republic
G. Karssen
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de
V. Karas
Affiliation:
Astronomical Institute, Academy of Sciences, CZ-14131 Prague, Czech Republic
M. Zajaček
Affiliation:
Astronomical Institute, Academy of Sciences, CZ-14131 Prague, Czech Republic Faculty of Mathematics and Physics, CZ-18000 Prague, Czech Republic
L. Bronfman
Affiliation:
Departemento de Astronomia, Universidad de Chile, Castilla 36-D, Santiago, Chile
R. Finger
Affiliation:
Departemento de Astronomia, Universidad de Chile, Castilla 36-D, Santiago, Chile
B. Jalali
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de
M. Vitale
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
C. Rauch
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
D. Kunneriath
Affiliation:
Astronomical Institute, Academy of Sciences, CZ-14131 Prague, Czech Republic
J. Moultaka
Affiliation:
Université de Toulouse; UPS-OMP; IRAP; Toulouse, France CNRS; IRAP; 14, avenue Edouard Belin, F-31400 Toulouse, France
C. Straubmeier
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de
Y. E. Rashed
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de
K. Markakis
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
A. Zensus
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Corresponding
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Abstract

A fast moving infrared excess source (G2) which is widely interpreted as a core-less gas and dust cloud approaches Sagittarius A* (Sgr A*) on a presumably elliptical orbit. VLT Ks-band and Keck K′-band data result in clear continuum identifications and proper motions of this ∼19m Dusty S-cluster Object (DSO). In 2002-2007 it is confused with the star S63, but free of confusion again since 2007. Its near-infrared (NIR) colors and a comparison to other sources in the field speak in favor of the DSO being an IR excess star with photospheric continuum emission at 2 microns than a core-less gas and dust cloud. We also find very compact L′-band emission (<0.1″) contrasted by the reported extended (0.03″ up to ∼0.2″ for the tail) Brγ emission. The presence of a star will change the expected accretion phenomena, since a stellar Roche lobe may retain a fraction of the material during and after the peri-bothron passage.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2014 

References

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The infrared K-band identification of the DSO/G2 source from VLT and Keck data
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