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

A Eckart, M Horrobin, S Britzen… - Proceedings of the …, 2013 - cambridge.org
A Eckart, M Horrobin, S Britzen, M Zamaninasab, K Mužić, N Sabha, B Shahzamanian…
Proceedings of the International Astronomical Union, 2013cambridge.org
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 …
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.
Cambridge University Press
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