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

0429558 - ASÚ 2015 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
Eckart, A. - Horrobin, M. - Britzen, S. - Zamaninasab, M. - Mužić, K. - Sabha, N. - Shahzamanian, B. - Yazici, S. - Moser, L. - García-Marín, M. - Bursa, Michal - Karas, Vladimír - Zajaček, Michal - Kunneriath, Devaky … celkem 27 autorů
The infrared K-band identification of the DSO/G2 source from VLT and Keck data.
The Galactic center: Feeding and Feedback in a Normal Galactic Nucleus. Cambridge: Cambridge University Press, 2014 - (Sjouwerman, L.), s. 269-273. IAU Symposium Proceedings Series, IAU S303. ISBN 9781107044616. ISSN 1743-9213.
[Symposium of the International Astronomical Union /303./. Santa Fe (US), 30.09.2013-04.10.2013]
Institucionální podpora: RVO:67985815
Klíčová slova: black holes physics * galaxy center * infrared stars
Obor OECD: Astronomy (including astrophysics,space science)

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 ˜19 m 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) Brgamma 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.
Trvalý link: http://hdl.handle.net/11104/0234649