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|Title:||Simultaneous Monitoring of X-Ray and Radio Variability in Sagittarius A*||Authors:||Capellupo, Daniel M.
Bower, Geoffrey C.
Fragile, P. Chris
Heinke, Craig O.
Law, Casey J.
|Issue Date:||2017||Journal:||THE ASTROPHYSICAL JOURNAL||Number:||845||Issue:||1||First Page:||35||Abstract:||Monitoring of Sagittarius A* from X-ray to radio wavelengths has revealed structured variability—including X-ray flares—but it is challenging to establish correlations between them. Most studies have focused on variability in the X-ray and infrared, where variations are often simultaneous, and because long time series at submillimeter and radio wavelengths are limited. Previous work on submillimeter and radio variability hints at a lag between X-ray flares and their candidate submillimeter or radio counterparts, with the long wavelength data lagging the X-ray. However, there is only one published time lag between an X-ray flare and a possible radio counterpart. Here we report nine contemporaneous X-ray and radio observations of Sgr A*. We detect significant radio variability peaking ≳ 176 minutes after the brightest X-ray flare ever detected from Sgr A*. We also report other potentially associated X-ray and radio variability, with the radio peaks appearing ≲ 80 minutes after these weaker X-ray flares. Taken at face value, these results suggest that stronger X-ray flares lead to longer time lags in the radio. However, we also test the possibility that the variability at X-ray and radio wavelengths is not temporally correlated. We cross-correlate data from mismatched X-ray and radio epochs and obtain comparable correlations to the matched data. Hence, we find no overall statistical evidence that X-ray flares and radio variability are correlated, underscoring a need for more simultaneous, long duration X-ray-radio monitoring of Sgr A*.||URI:||http://hdl.handle.net/20.500.12386/29421||ISSN:||0004-637X||DOI:||10.3847/1538-4357/aa7da6||Bibcode ADS:||2017ApJ...845...35C||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Jan 16, 2021
checked on Jan 16, 2021
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