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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29421
Title: Simultaneous Monitoring of X-Ray and Radio Variability in Sagittarius A*
Authors: Capellupo, Daniel M.
Haggard, Daryl
Choux, Nicolas
Baganoff, Fred
Bower, Geoffrey C.
Cotton, Bill
Degenaar, Nathalie
Dexter, Jason
Falcke, Heino
Fragile, P. Chris
Heinke, Craig O.
Law, Casey J.
Markoff, Sera
Neilsen, Joey
PONTI, GABRIELE 
Rea, Nanda
Yusef-Zadeh, Farhad
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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