Monitoring the Galactic Centre with the Australia Telescope Compact Array

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F16%3A00458284" target="_blank" >RIV/67985815:_____/16:00458284 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1093/mnras/stw362" target="_blank" >http://dx.doi.org/10.1093/mnras/stw362</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stw362" target="_blank" >10.1093/mnras/stw362</a>

Result language
angličtina
Original language name
Monitoring the Galactic Centre with the Australia Telescope Compact Array
Original language description
The supermassive black hole, Sagittarius A* (Sgr A*), at the centre of the Milky Way undergoes regular flaring activity, which is thought to arise from the innermost region of the accretion flow. Between 2010 and 2014, we performed monitoring observations of the Galactic Centre to study the flux-density variations at 3 mm using the Australia Telescope Compact Array (ATCA). We obtain light curves of Sgr A* by subtracting the contributions from the extended emission around it, and the elevation and time-dependent gains of the telescope. We perform structure function analysis and the Bayesian blocks representation to detect flare events. The observations detect six instances of significant variability in the flux density of Sgr A* in three observations. We use the adiabatically expanding plasmon model to explain the short time-scale variations. We derive the physical quantities of the modelled flare emission, such as the source expansion speed. No exceptional flux-density variation on short flare time-scales was observed during the approach and the flyby of the dusty S-cluster object (DSO/G2). This is consistent with its compactness and the absence of a large bow shock.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BN - Astronomy and celestial mechanics, astrophysics
OECD FORD branch
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Project
<a href="/en/project/GC13-00070J" target="_blank" >GC13-00070J: Accretion process in strong gravity of Galactic Center</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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