Universität zu Köln

Peissker, Florian ORCID: 0000-0002-9850-2708, Eckart, Andreas ORCID: 0000-0001-6049-3132, Sabha, Nadeen B. ORCID: 0000-0001-7134-9005, Zajacek, Michal ORCID: 0000-0001-6450-1187 and Bhat, Harshitha (2020). Near- and Mid-infrared Observations in the Inner Tenth of a Parsec of the Galactic Center Detection of Proper Motion of a Filament Very Close to Sgr A*. Astrophys. J., 897 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We analyze the gas and dust emission in the immediate vicinity of the supermassive black hole Sgr A* at the Galactic center (GC) with the ESO Very Large Telescope (Paranal/Chile) instruments SINFONI and VISIR. The SINFONIH+Kdata cubes show several emission lines with related line map counterparts. From these lines, the Br gamma emission is the most prominent one and appears to be shaped as a bar extending along the north-south direction. With VISIR, we find a dusty counterpart to this filamentary emission. In this work, we present evidence that this feature could most be likely connected to the minispiral and potentially influenced by the winds of the massive stars in the central cluster or an accretion wind from Sgr A*. To this end, we coadd the SINFONI data between 2005 and 2015. The spectroscopic analysis reveals a range of Doppler-shifted emission lines. We also detect substructures in the shape of clumps that can be investigated in the channel maps of the Br gamma bar. In addition, we compare the detection of the near-infrared Br gamma feature to PAH1 mid-infrared observations and published 226 GHz radio data. These clumps show a proper motion of about 320 km s(-1)that are consistent with other infrared continuum-detected filaments in the GC. Deriving a mass of gamma feature shows an agreement with former derived masses for similar objects. Besides the north-south Br gamma bar, we find a comparable additional east-west feature. Also, we identify several gas reservoirs that are located west of Sgr A* that may harbor dusty objects.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Peissker, Florian UNSPECIFIED orcid.org/0000-0002-9850-2708 UNSPECIFIED Eckart, Andreas UNSPECIFIED orcid.org/0000-0001-6049-3132 UNSPECIFIED Sabha, Nadeen B. UNSPECIFIED orcid.org/0000-0001-7134-9005 UNSPECIFIED Zajacek, Michal UNSPECIFIED orcid.org/0000-0001-6450-1187 UNSPECIFIED Bhat, Harshitha UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-327764
DOI:	10.3847/1538-4357/ab9826
Journal or Publication Title:	Astrophys. J.
Volume:	897
Number:	1
Date:	2020
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WEBB-SPACE-TELESCOPE; SUPERMASSIVE BLACK-HOLE; IONIZED-GAS; STAR-FORMATION; CLUMP FORMATION; STELLAR; SAGITTARIUS; EMISSION; SIMULATIONS; INSTRUMENT Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/32776