Centaurus A: hard x-ray and high-energy gamma-ray light curve correlation
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Date
2019Author
Davids, Isak Delberth
Böttcher, Markus
Backes, Michael
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Centaurus A, powered by a 55 million solar mass supermassive black hole, has been intensively monitored in all accessible wavelength ranges of the electromagnetic spectrum. However, its very-high energy gamma ( γ ) ray flux (TeV photons), obtained from H.E.S.S. is relatively faint, hampering detailed light curve analyses in the most energetic energy band. Yet, the extensive long-term light curve data from Fermi-LAT and Swift-BAT (hard X-rays) allows for cross-correlation studies. We find a hint that X-ray emission from Centaurus A precedes the γ rays by 25±125 days. If this lag is real and related to a γγ absorption effect in the broad-line region (BLR) around the central source, we can constrain the size of the BLR using light-travel time arguments. These are first results of extended light curve correlation studies between high-energy γ rays and X-rays from Centaurus A
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http://hdl.handle.net/10394/33086https://www.mdpi.com/2075-4434/7/2/44/pdf
https://doi.org/10.3390/galaxies7020044