Universität zu Köln

Peissker, Florian ORCID: 0000-0002-9850-2708, Zajacek, Michal ORCID: 0000-0001-6450-1187, Eckart, Andreas, Ali, Basel, Karas, Vladimir ORCID: 0000-0002-5760-0459, Sabha, Nadeen B. ORCID: 0000-0001-7134-9005, Grellmann, Rebekka ORCID: 0000-0001-5429-2369, Labadie, Lucas and Shahzamanian, Banafsheh ORCID: 0000-0001-6437-6806 (2021). The Apparent Tail of the Galactic Center Object G2/DSO. Astrophys. J., 923 (1). BRISTOL: IOP Publishing Ltd. ISSN 1538-4357

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Abstract

Observations of the near-infrared excess object G2/DSO increased attention toward the Galactic center and its vicinity. The predicted flaring event in 2014 and the outcome of the intense monitoring of the supermassive black hole in the center of our Galaxy did not fulfill all predictions about a significantly enhanced accretion event. Subsequent observations addressed the question concerning the nature of the object because of its compact shape, especially during its periapse in 2014. Theoretical approaches have attempted to answer the contradictory behavior of the object, resisting the expected dissolution of a gaseous cloud due to tidal forces in combination with evaporation and hydrodynamical instabilities. However, assuming that the object is instead a dust-enshrouded young stellar object seems to be in line with the predictions of several groups and observations presented in numerous publications. Here we present a detailed overview and analysis of the observations of the object that have been performed with SINFONI (VLT) and we provide a comprehensive approach to clarify the nature of G2/DSO. We show that the tail emission consists of two isolated and compact sources with different orbital elements for each source rather than an extended and stretched component as it appeared in previous representations of the same data. Considering our recent publications, we propose that the monitored dust-enshrouded objects are remnants of a dissolved young stellar cluster whose formation was initiated in the circumnuclear disk. This indicates a shared history, which agrees with our analysis of the D- and X-sources.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Peissker, Florian UNSPECIFIED orcid.org/0000-0002-9850-2708 UNSPECIFIED Zajacek, Michal UNSPECIFIED orcid.org/0000-0001-6450-1187 UNSPECIFIED Eckart, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Ali, Basel UNSPECIFIED UNSPECIFIED UNSPECIFIED Karas, Vladimir UNSPECIFIED orcid.org/0000-0002-5760-0459 UNSPECIFIED Sabha, Nadeen B. UNSPECIFIED orcid.org/0000-0001-7134-9005 UNSPECIFIED Grellmann, Rebekka UNSPECIFIED orcid.org/0000-0001-5429-2369 UNSPECIFIED Labadie, Lucas UNSPECIFIED UNSPECIFIED UNSPECIFIED Shahzamanian, Banafsheh UNSPECIFIED orcid.org/0000-0001-6437-6806 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-598633
DOI:	10.3847/1538-4357/ac23df
Journal or Publication Title:	Astrophys. J.
Volume:	923
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 WEBB-SPACE-TELESCOPE; SUPERMASSIVE BLACK-HOLE; GAS CLOUD G2; STAR-FORMATION; MIDINFRARED INSTRUMENT; YOUNG STARS; STELLAR ORBITS; OH-EMISSION; A-ASTERISK; MILKY Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59863