Počet záznamů: 1
Monitoring the Galactic Centre with the Australia Telescope Compact Array
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SYSNO ASEP 0458284 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Monitoring the Galactic Centre with the Australia Telescope Compact Array Tvůrce(i) Borkar, A. (DE)
Eckart, A. (DE)
Straubmeier, C. (DE)
Kunneriath, Devaky (ASU-R) RID
Jalali, B. (DE)
Sabha, N. (DE)
Shahzamanian, B. (DE)
García-Marín, M. (DE)
Valencia-S, M. (DE)
Sjouwerman, L. (US)
Britzen, S. (DE)
Karas, Vladimír (ASU-R) RID, ORCID
Dovčiak, Michal (ASU-R) RID, ORCID
Donea, A. (AU)
Zensus, A. (DE)Celkový počet autorů 15 Zdroj.dok. Monthly Notices of the Royal Astronomical Society. - : Oxford University Press - ISSN 0035-8711
Roč. 458, č. 3 (2016), s. 2336-2349Poč.str. 14 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova galactic Centre ; black hole Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika CEP GC13-00070J GA ČR - Grantová agentura ČR Institucionální podpora ASU-R - RVO:67985815 UT WOS 000375799000006 EID SCOPUS 84964746663 DOI 10.1093/mnras/stw362 Anotace 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. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2017
Počet záznamů: 1