Název: Polarization properties of bow shock sources close to the Galactic centre
Autoři: Zajaček, M. ; Karas, Vladimír ; Hosseini, E. ; Eckart, A. ; Shahzamanian, B. ; Valencia-S, M. ; Peissker, F. ; Busch, G. ; Britzen, S. ; Zensus, J. A.
Typ dokumentu: Příspěvky z konference
Konference/Akce: RAGtime /17.-19./, Opava (CZ), 20151117
Rok: 2017
Jazyk: eng
Abstrakt: Several bow shock sources were detected and resolved in the innermost parsec from the supermassive black hole in the Galactic centre. They show several distinct characteristics, including an excess towards mid-infrared wavelengths and a significant linear polarization as well as a characteristic prolonged bow-shock shape. These features give hints about the presence of a non-spherical dusty envelope generated\nby the bow shock. The Dusty S-cluster Object (also denoted as G2) shows similar characteristics and it is a candidate for the closest bow shock with a detected proper motion in the vicinity of Sgr A*, with the pericentre distance of only approx. 2000 Schwarzschild radii. However, in the continuum emission it is a point-like source and hence we use Monte Carlo radiative transfer modeling to reveal its possible three-dimensional structure. Alongside the spectral energy distribution, the detection of polarized continuum emission in the near-infrared Ks-band (2.2 micrometers) puts additional constraints on the geometry of the source.
Klíčová slova: black hole physics – Galaxy: centre –; galaxy centra; radiative transfer
Číslo projektu: 312789, LTI17018, 7E13012 (CEP)
Poskytovatel projektu: GA MŠk, GA MŠk
Zdrojový dokument: Proceedings of RAGtime 17/19: Workshops on black holes and neutron stars, ISBN 9788075102577, ISSN 2336-5668

Instituce: Astronomický ústav AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný na externích webových stránkách.
Externí umístění souboru: http://proceedings.physics.cz/images/proc17/zaj.pdf
Původní záznam: http://hdl.handle.net/11104/0280091

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-371468


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Věda a výzkum > AV ČR > Astronomický ústav
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