Universität zu Köln

Bhat, Harshitha K., Sabha, Nadeen B. ORCID: 0000-0001-7134-9005, Zajacek, Michal ORCID: 0000-0001-6450-1187, Eckart, Andreas, Schodel, Rainer, Hosseini, S. Elaheh, Peissker, Florian ORCID: 0000-0002-9850-2708 and Zensus, Anton (2022). Mid-infrared Studies of Dusty Sources in the Galactic Center. Astrophys. J., 929 (2). BRISTOL: IOP Publishing Ltd. ISSN 1538-4357

Full text not available from this repository.

Abstract

Mid-infrared (MIR) images of the Galactic center show extended gas and dust features along with bright infrared sources (IRS). Some of these dust features are a part of ionized clumpy streamers orbiting Sgr A*, known as the mini-spiral. We present their proper motions over a 12 yr time period and report their flux densities in N-band filters and derive their spectral indices. The observations were carried out by VISIR at the ESO's Very Large Telescope. High-pass filtering led to the detection of several resolved filaments and clumps along the mini-spiral. Each source was fit by a 2D Gaussian profile to determine the offsets and aperture sizes. We perform aperture photometry to extract fluxes in two different bands. We present the proper motions of the largest consistent set of resolved and reliably determined sources. In addition to stellar orbital motions, we identify a stream-like motion of extended clumps along the mini-spiral. We also detect MIR counterparts of the radio tail components of the IRS 7 source. They show a clear kinematical deviation with respect to the star. They likely represent Kelvin-Helmholtz instabilities formed downstream in the shocked stellar wind. We also analyze the shape and orientation of the extended late-type IRS 3 star that is consistent with the Atacama Large Millimeter/submillimeter Array submillimeter detection of the source. Its puffed-up envelope with a radius of similar to 2 x 10(6) R (circle dot) could be the result of the red-giant collision with a nuclear jet, which was followed by tidal prolongation along the orbit.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bhat, Harshitha K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sabha, Nadeen B. UNSPECIFIED orcid.org/0000-0001-7134-9005 UNSPECIFIED Zajacek, Michal UNSPECIFIED orcid.org/0000-0001-6450-1187 UNSPECIFIED Eckart, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Schodel, Rainer UNSPECIFIED UNSPECIFIED UNSPECIFIED Hosseini, S. Elaheh UNSPECIFIED UNSPECIFIED UNSPECIFIED Peissker, Florian UNSPECIFIED orcid.org/0000-0002-9850-2708 UNSPECIFIED Zensus, Anton UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-684680
DOI:	10.3847/1538-4357/ac6106
Journal or Publication Title:	Astrophys. J.
Volume:	929
Number:	2
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 SAGITTARIUS-A-ASTERISK; CENTRAL PARSEC; PROPER MOTIONS; IONIZED-GAS; LINEAR-POLARIZATION; CIRCUMNUCLEAR DISK; INFRARED-EMISSION; NEUTRAL GAS; HOT GAS; SUPERGIANT Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68468