Multi-Epoch VERA Observations of Sagittarius A*. I. Images and Structural Variability

Akiyama Kazunori; Takahashi Rohta; Honma Mareki; Oyama Tomoaki; Kobayashi Hideyuki

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Multi-Epoch VERA Observations of Sagittarius A*. I. Images and Structural Variability

机译：人马座A *的多时期VERA观测。一，图像和结构变异

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Wereportontheresultsofmulti-epochobservationsofSgrA$$^*$$withVLBIExplorationofRadioAstrometry(VERA)at43GHz,carriedoutfrom2004to2008.Wedetectedatimevariationofthefluxatthe11%levelandtheintrinsicsizeat19%.Inaddition,comparisonswithpreviousVeryLongBaselineArray(VLBA)resultsshowedthatSgrA$$^*$$underwentaflaringeventforatleastlongerthan10din2007May.TheintrinsicsizeofSgrA$$^*$$remainedunchangedwithinthe1$$sigma$$levelfromthesizebefore/aftertheflaringevent,indicatingthatthebrightnesstemperatureofSgrA$$^*$$wasincreased.Theflaringeventoccurredwithin31d,whichisshorterthantherefractivetimescale.Moreoveritisdifficulttoexplaintheincreaseinthespectralindexattheflaringeventbyasimpleinterstellarscatteringmodel.Hence,theflaringeventismostlikelyassociatedwithchangesintheintrinsicpropertiesofSgrA$$^*$$.Weconsideredtheoriginofthebrightnesstemperaturevariation,andconcludedthattheflaringeventofSgrA$$^*$$couldbeexplainedbythecontinuousheatingofelectrons,suchasastandingshockinaccretionflow.

机译：Wereportontheresultsofmulti-epochobservationsofSgrA $$ ^ * $$ withVLBIExplorationofRadioAstrometry（VERA）at43GHz，carriedoutfrom2004to2008.Wedetectedatimevariationofthefluxatthe11％levelandtheintrinsicsizeat19％.Inaddition，comparisonswithpreviousVeryLongBaselineArray（VLBA）resultsshowedthatSgrA $$ ^ * $$ underwentaflaringeventforatleastlongerthan10din2007May.TheintrinsicsizeofSgrA $$ ^ * $$ remainedunchangedwithinthe1 $$西格玛$$ levelfromthesizebefore / aftertheflaringevent，indicatingthatthebrightnesstemperatureofSgrA $$ ^ * $$ wasincreased.Theflaringeventoccurredwithin31d，whichisshorterthantherefractivetimescale.Moreoveritisdifficulttoexplaintheincreaseinthespectralindexattheflaringeventbyasimpleinterstellarscatteringmodel.Hence，theflaringeventismostlikelyassociatedwithchangesintheintrinsicpropertiesofSgrA $$ ^ * $$。Weconsideredtheoriginofthebrightnesstemperaturevariation，andconcludedthattheflaringeventofSgrA $$ ^ * $$ couldbeexplainedbythecontinuousheatingofelectrons，suchasastandingshockinaccretionflow。

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《PASJ: Publications of the Astronomical Society of Japan》 |2013年第4期|共页
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Akiyama Kazunori; Takahashi Rohta; Honma Mareki; Oyama Tomoaki; Kobayashi Hideyuki;
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