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

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 Obj...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2013-10, Vol.9 (S303), p.269-273
Main Authors: Eckart, A., Horrobin, M., Britzen, S., Zamaninasab, M., Mužić, K., Sabha, N., Shahzamanian, B., Yazici, S., Moser, L., García-Marin, M., Valencia-S., M., Borkar, A., Bursa, M., Karssen, G., Karas, V., Zajaček, M., Bronfman, L., Finger, R., Jalali, B., Vitale, M., Rauch, C., Kunneriath, D., Moultaka, J., Straubmeier, C., Rashed, Y. E., Markakis, K., Zensus, A.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Black holes
Contributed Papers
Stars & galaxies
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Summary: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 (
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921314000726