Capellupo, Daniel M.Daniel M.CapellupoHaggard, DarylDarylHaggardChoux, NicolasNicolasChouxBaganoff, FredFredBaganoffBower, Geoffrey C.Geoffrey C.BowerCotton, BillBillCottonDegenaar, NathalieNathalieDegenaarDexter, JasonJasonDexterFalcke, HeinoHeinoFalckeFragile, P. ChrisP. ChrisFragileHeinke, Craig O.Craig O.HeinkeLaw, Casey J.Casey J.LawMarkoff, SeraSeraMarkoffNeilsen, JoeyJoeyNeilsenPONTI, GABRIELEGABRIELEPONTIRea, NandaNandaReaYusef-Zadeh, FarhadFarhadYusef-Zadeh2021-01-042021-01-0420170004-637Xhttp://hdl.handle.net/20.500.12386/29421Monitoring 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*.STAMPAenArticle10.3847/1538-4357/aa7da62-s2.0-850292333120004073298000142017ApJ...845...35CFIS/05 - ASTRONOMIA E ASTROFISICA