Universität zu Köln

Peissker, Florian ORCID: 0000-0002-9850-2708, Ali, Basel ORCID: 0000-0002-5728-4054, Zajacek, Michal ORCID: 0000-0001-6450-1187, Eckart, Andreas, Hosseini, S. Elaheh, Karas, Vladimir ORCID: 0000-0002-5760-0459, Clenet, Yann, Sabha, Nadeen B. ORCID: 0000-0001-7134-9005, Labadie, Lucas and Subroweit, Matthias (2021). First Observed Interaction of the Circumstellar Envelope of an S-star with the Environment of Sgr A. Astrophys. J., 909 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

Several publications highlight the importance of the observations of bow shocks to learn more about the surrounding interstellar medium and radiation field. We revisit the most prominent dusty and gaseous bow shock source, X7, close to the supermassive black hole, Sgr A*, using multiwavelength analysis. For the purpose of this study, 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Peissker, Florian UNSPECIFIED orcid.org/0000-0002-9850-2708 UNSPECIFIED Ali, Basel UNSPECIFIED orcid.org/0000-0002-5728-4054 UNSPECIFIED Zajacek, Michal UNSPECIFIED orcid.org/0000-0001-6450-1187 UNSPECIFIED Eckart, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Hosseini, S. Elaheh UNSPECIFIED UNSPECIFIED UNSPECIFIED Karas, Vladimir UNSPECIFIED orcid.org/0000-0002-5760-0459 UNSPECIFIED Clenet, Yann UNSPECIFIED UNSPECIFIED UNSPECIFIED Sabha, Nadeen B. UNSPECIFIED orcid.org/0000-0001-7134-9005 UNSPECIFIED Labadie, Lucas UNSPECIFIED UNSPECIFIED UNSPECIFIED Subroweit, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-598803
DOI:	10.3847/1538-4357/abd9c6
Journal or Publication Title:	Astrophys. J.
Volume:	909
Number:	1
Date:	2021
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SYSTEM; NAOS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59880