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Polarization properties of bow shock sources close to the Galactic centre
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SYSNO ASEP 0484969 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Polarization properties of bow shock sources close to the Galactic centre Author(s) Zajaček, M. (DE)
Karas, Vladimír (ASU-R) RID, ORCID
Hosseini, E. (DE)
Eckart, A. (DE)
Shahzamanian, B. (DE)
Valencia-S, M. (DE)
Peissker, F. (DE)
Busch, G. (DE)
Britzen, S. (DE)
Zensus, J. A. (DE)Source Title Proceedings of RAGtime 17/19: Workshops on black holes and neutron stars. - Opava : Silesian University, 2017 - ISSN 2336-5668 - ISBN 9788075102577 Pages s. 237-252 Number of pages 16 s. Publication form Print - P Action RAGtime /17.-19./ Event date 17.11.2015 - 19.11.2015 VEvent location Opava Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords black hole physics – Galaxy: centre – ; galaxy centra ; radiative transfer Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects LTI17018 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) 7E13012 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support ASU-R - RVO:67985815 EID SCOPUS 85041816882 Annotation 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
by 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.Workplace Astronomical Institute Contact Anežka Melichárková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2018
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