Centaurus A: Hard X-ray and High-Energy Gamma-Ray Light Curve Correlation
Department of Physics, University of Namibia, Private Bag 13301, Windhoek 12010, Namibia
Centre for Space Research, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa
Author to whom correspondence should be addressed.
Received: 26 February 2019 / Revised: 25 March 2019 / Accepted: 27 March 2019 / Published: 4 April 2019
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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 (
) 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
days. If this lag is real and related to a
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
rays and X-rays from Centaurus A.
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MDPI and ACS Style
Davids, I.D.; Böttcher, M.; Backes, M. Centaurus A: Hard X-ray and High-Energy Gamma-Ray Light Curve Correlation. Galaxies 2019, 7, 44.
Davids ID, Böttcher M, Backes M. Centaurus A: Hard X-ray and High-Energy Gamma-Ray Light Curve Correlation. Galaxies. 2019; 7(2):44.
Davids, Isak D.; Böttcher, Markus; Backes, Michael. 2019. "Centaurus A: Hard X-ray and High-Energy Gamma-Ray Light Curve Correlation." Galaxies 7, no. 2: 44.
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