Variable and Polarised Near-infrared Emission from the Galactic Centre

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F15%3A00450777" target="_blank" >RIV/67985815:_____/15:00450777 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Variable and Polarised Near-infrared Emission from the Galactic Centre

Popis výsledku v původním jazyce

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 ?m) 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.

Název v anglickém jazyce

Variable and Polarised Near-infrared Emission from the Galactic Centre

Popis výsledku anglicky

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 ?m) 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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Messenger

ISSN

0722-6691

e-ISSN

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Svazek periodika

159

Číslo periodika v rámci svazku

March

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

5

Strana od-do

41-45

Kód UT WoS článku

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EID výsledku v databázi Scopus

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