Variable and Polarised Near-infrared Emission from the Galactic Centre

Shahzamanian, B.; Eckart, A.; Valencia-S, M.; Witzel, G.; Zamaninasab, M.; Zajaček, Michal; Sabha, N.; García-Marín, M.; Karas, Vladimír; Peissker, F.; Karssen, G.; Parsa, M.; Grosso, N.; Mossoux, E.; Porquet, D.; Jalali, B.; Horrobin, M.; Buchholz, R. M.; Dovčiak, Michal; Kunneriath, Devaky; Bursa, Michal; Zensus, A.; Schödel, R.; Moultaka, J.; Straubmeier, C.

Number of the records: 1

Variable and Polarised Near-infrared Emission from the Galactic Centre

1.

SYSNO ASEP	0450777
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Ostatní články
Title	Variable and Polarised Near-infrared Emission from the Galactic Centre
Author(s)	Shahzamanian, B. (DE) Eckart, A. (DE) Valencia-S, M. (DE) Witzel, G. (DE) Zamaninasab, M. (DE) Zajaček, Michal (ASU-R)_ORCID Sabha, N. (DE) García-Marín, M. (DE) Karas, Vladimír (ASU-R)_{RID, ORCID} Peissker, F. (DE) Karssen, G. (DE) Parsa, M. (DE) Grosso, N. (FR) Mossoux, E. (FR) Porquet, D. (FR) Jalali, B. (DE) Horrobin, M. (DE) Buchholz, R. M. (DE) Dovčiak, Michal (ASU-R)_{RID, ORCID} Kunneriath, Devaky (ASU-R)_RID Bursa, Michal (ASU-R)_{RID, ORCID} Zensus, A. (DE) Schödel, R. (DE) Moultaka, J. (DE) Straubmeier, C. (DE)
Source Title	Messenger. - : European Southern Observatory - ISSN 0722-6691 Roč. 159, March (2015), s. 41-45
Number of pages	5 s.
Publication form	Print - P
Language	eng - English
Country	DE - Germany
Keywords	polarisation effects ; galactic center ; observations
Subject RIV	BN - Astronomy, Celestial Mechanics, Astrophysics
Institutional support	ASU-R - RVO:67985815
Annotation	Infrared observations of the Galactic Centre (GC) provide a unique opportunity to study stellar and bow-shock polarisation effects in a dusty environment. For the infrared counterpart of the supermassive black hole Sgr A* these observations reveal new insights into the physical processes at work. The observations were carried out with NACO in the Ks-band (2.2 µm) from 2004 to 2012 and several linearly polarised flares were observed during these years. We find that the distribution of polarised flux density is closely related to the single-state power-law distribution of the total flux densities. A typical polarisation degree of the order of 10-20% and a preferred polarisation angle of 13° ± 15° are derived, likely linked to the intrinsic orientation of the Sgr A* system. We discuss different scenarios for the accretion process for the Sgr A* system based on our findings.
Workplace	Astronomical Institute
Contact	Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326
Year of Publishing	2016

Number of the records: 1