First Observed Interaction of the Circumstellar Envelope of an S-star with the Environment of Sgr A

0548954 - ASÚ 2022 RIV US eng J - Článek v odborném periodiku
Peissker, F. - Ali, B. - Zajaček, M. - Eckart, A. - Hosseini, S. E. - Karas, Vladimír - Clénet, Y. - Sabha, N. - Labadie, L. - Subroweit, M.
First Observed Interaction of the Circumstellar Envelope of an S-star with the Environment of Sgr A.
Astrophysical Journal. Roč. 909, č. 1 (2021), č. článku 62. ISSN 0004-637X. E-ISSN 1538-4357
Grant CEP: GA ČR(CZ) GC19-01137J
Institucionální podpora: RVO:67985815
Klíčová slova: galactic center * star clusters * star formation
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.521, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.3847/1538-4357/abd9c6

We use Spectrograph for Integral Field Observations in the Near Infrared (SINFONI) (H+K-band) and NACO L '- and M '-band) data sets between 2002 and 2018 with additional COMIC/ADONIS+RASOIR (L '-band)(7) data of 1999. By analyzing the line maps of SINFONI, we identify a velocity of similar to 200 km s(-1) from the tip to the tail. Furthermore, a combination of the multiwavelength data of NACO and SINFONI in the H-, K-, L '-, and M '-bands results in a two-component blackbody fit that implies that X7 is a dust-enshrouded stellar object. The observed ongoing elongation and orientation of X7 in the Br gamma line maps and the NACO L '-band continuum indicate a wind arising at the position of Sgr A* or at the IRS16 complex. Observations after 2010 show that the dust and the gas shell seems to be decoupled in the projection from its stellar source S50. The data also implies that the tail of X7 thermally heats up due to the presence of S50. The gas emission at the tip is excited because of the related forward scattering (Mie scattering), which will continue to influence the shape of X7 in the near future. In addition, we find excited [Fe iii] lines, which together with the recently analyzed dusty sources and the Br gamma-bar underline the uniqueness of this source.
Trvalý link: http://hdl.handle.net/11104/0324996