Monitoring the Galactic Centre with the Australia Telescope Compact Array

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Monitoring the Galactic Centre with the Australia Telescope Compact Array

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Monitoring the Galactic Centre with the Australia Telescope Compact Array

Popis výsledku anglicky

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.

Druh

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

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

—

Projekt

<a href="/cs/project/GC13-00070J" target="_blank" >GC13-00070J: Proces akrece v silné gravitaci jádra Galaxie</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

458

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

14

Strana od-do

2336-2349

Kód UT WoS článku

000375799000006

EID výsledku v databázi Scopus

2-s2.0-84964746663