| BHAT, Harshitha K., Nadeen B. SABHA, Michal ZAJAČEK, Andreas ECKART, Rainer SCHODEL, S. Elaheh HOSSEINI, Florian PEISSKER a Anton ZENSUS. Mid-infrared Studies of Dusty Sources in the Galactic Center. Astrophysical Journal. IOP Publishing Ltd, 2022, roč. 929, č. 2, s. 1-21. ISSN 0004-637X. Dostupné z: https://dx.doi.org/10.3847/1538-4357/ac6106. |
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@article{2239826,
author = {Bhat, Harshitha K. and Sabha, Nadeen B. and Zajaček, Michal and Eckart, Andreas and Schodel, Rainer and Hosseini, S. Elaheh and Peissker, Florian and Zensus, Anton},
article_number = {2},
doi = {http://dx.doi.org/10.3847/1538-4357/ac6106},
keywords = {Galactic center; Infrared photometry; Galaxy kinematics},
language = {eng},
issn = {0004-637X},
journal = {Astrophysical Journal},
title = {Mid-infrared Studies of Dusty Sources in the Galactic Center},
url = {https://iopscience.iop.org/article/10.3847/1538-4357/ac6106},
volume = {929},
year = {2022}
}
TY - JOUR
ID - 2239826
AU - Bhat, Harshitha K. - Sabha, Nadeen B. - Zajaček, Michal - Eckart, Andreas - Schodel, Rainer - Hosseini, S. Elaheh - Peissker, Florian - Zensus, Anton
PY - 2022
TI - Mid-infrared Studies of Dusty Sources in the Galactic Center
JF - Astrophysical Journal
VL - 929
IS - 2
SP - 1-21
EP - 1-21
PB - IOP Publishing Ltd
SN - 0004637X
KW - Galactic center
KW - Infrared photometry
KW - Galaxy kinematics
UR - https://iopscience.iop.org/article/10.3847/1538-4357/ac6106
N2 - 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 ∼2 × 106 R⊙ could be the result of the red-giant collision with a nuclear jet, which was followed by tidal prolongation along the orbit.
ER -
BHAT, Harshitha K., Nadeen B. SABHA, Michal ZAJAČEK, Andreas ECKART, Rainer SCHODEL, S. Elaheh HOSSEINI, Florian PEISSKER a Anton ZENSUS. Mid-infrared Studies of Dusty Sources in the Galactic Center. \textit{Astrophysical Journal}. IOP Publishing Ltd, 2022, roč.~929, č.~2, s.~1-21. ISSN~0004-637X. Dostupné z: https://dx.doi.org/10.3847/1538-4357/ac6106.
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