Infrared-excess Source DSO/G2 Near the Galactic Center: Theory vs. Observations

0453606 - ASÚ 2016 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Zajaček, M. - Eckart, A. - Peissker, F. - Karssen, G. - Karas, Vladimír
Infrared-excess Source DSO/G2 Near the Galactic Center: Theory vs. Observations.
WDS 2015: Proceedings of Contributed Papers: Physics. Prague: Matfyzpress, 2015 - (Šafránková, J.; Pavlů, J.), s. 27-35. ISBN 9788073783112.
[Week of Doctoral Students. Prague (CZ), 04.06.2015-02.06.2015]
Institucionální podpora: RVO:67985815
Klíčová slova: galactic centre
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
https://hera.ph1.uni-koeln.de/~zajacek/WDS15_04_f1_Zajacek.pdf

Based on the monitoring of the Dusty S-cluster Object (DSO/G2) during its closest approach to the Galactic Center supermassive black hole in 2014 and 2015 with ESO VLT/SINFONI, we further explore the model of a young, accreting star to explain observed spectral and morphological features. The stellar scenario is supported by our ndings, i.e., ionized-hydrogen emission from the DSO that remains spatially compact before and after the peribothron passage. The detection of DSO/G2 object as a compact single-peak emission-line source is not consistent with the original hypothesis of a core-less cloud that is necessarily tidally stretched, hence producing a double-peak emission line prole around the pericentre passage. This strengthens the evidence that the DSO/G2 source is a dust-enshrouded young star that appears to be in an accretion phase. The infall of material from the circumstellar disc onto the stellar surface can contribute signicantly to the emission of Br line as well as the observed large line width of the order of 10 angstrom.
Trvalý link: http://hdl.handle.net/11104/0255836