Universität zu Köln

Peissker, Florian ORCID: 0000-0002-9850-2708, Eckart, Andreas, Zajacek, Michal ORCID: 0000-0001-6450-1187 and Britzen, Silke (2022). Observation of S4716-a Star with a 4 yr Orbit around Sgr A*. Astrophys. J., 933 (1). BRISTOL: IOP Publishing Ltd. ISSN 1538-4357

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Abstract

The ongoing monitoring of the Galactic center and Sgr A*, the central supermassive black hole, produces surprising and unexpected findings. This goes hand in hand with the technical evolution of ground- and space-based telescopes and instruments, but also with the progression of image filter techniques such as the Lucy-Richardson algorithm. As we continue to trace the members of the S cluster close to Sgr A* on their expected trajectory around the supermassive black hole, we present the finding of a new stellar source, which we call S4716. The newly found star orbits Sgr A* in about 4.0 yr and can be detected with NIRC2 (Keck), OSIRIS (Keck), SINFONI (VLT), NACO (VLT), and GRAVITY (VLTI). With a periapse distance of about 100 au, S4716 shows an equivalent distance toward Sgr A* as S4711. These fast-moving stars undergo a similar dynamical evolution, since S4711-S4716 share comparable orbital properties. We will furthermore draw a connection between the recent finding of a new faint star called S300 and the data presented here. Additionally, we observed a blend-star event with S4716 and another newly identified S star S148 in 2017.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Peissker, Florian UNSPECIFIED orcid.org/0000-0002-9850-2708 UNSPECIFIED Eckart, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Zajacek, Michal UNSPECIFIED orcid.org/0000-0001-6450-1187 UNSPECIFIED Britzen, Silke UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-673552
DOI:	10.3847/1538-4357/ac752f
Journal or Publication Title:	Astrophys. J.
Volume:	933
Number:	1
Date:	2022
Publisher:	IOP Publishing Ltd
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SUPERMASSIVE BLACK-HOLE; EVENT HORIZON TELESCOPE; GALACTIC-CENTER; STELLAR ORBITS; PROPER MOTIONS; CIRCUMSTELLAR ENVELOPE; ADAPTIVE OPTICS; 1ST; CLUSTER; DISK Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67355