A 2143-day HAWC/Swift-XRT campaign finds a linear X-ray/TeV correlation for Mrk 421, tentative correlation evidence for Mrk 501, and confirms harder-when-brighter gamma-ray behavior in Mrk 421.
Gamma-ray light curves for the BL Lac Mrk 421 using HAWC data derived with a new approach
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abstract
The HAWC gamma ray observatory is located at the Sierra Negra Volcano in Puebla, Mexico, at an altitude of 4,100 meters. HAWC is a wide field of view array of 300 water Cherenkov detectors that are continuously surveying 2sr of the sky since March 2015. The large collected data sample consisting in more than 3 years makes HAWC an ideal instrument to perform an unbiased monitoring of blazars in the very-high-energy (VHE) emission. This is particular relevant for Mrk 421, one of the closest and brightest blazars in the gamma-ray/X-ray classified as highsynchrotron-peaked BL Lac class. In this work we present light curves for Mrk 421 and the Crab nebula obtained with the first 17 months of data and a new analysis framework. We compare the results with the light curves reported in [1]. The main advantage of the new framework is the capability to derive fluxes for arbitrary timescales. We show that both, previous and present, methods give consistent results
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Study of long-term spectral evolution and X-ray and Gamma-ray correlation of blazars seen by HAWC
A 2143-day HAWC/Swift-XRT campaign finds a linear X-ray/TeV correlation for Mrk 421, tentative correlation evidence for Mrk 501, and confirms harder-when-brighter gamma-ray behavior in Mrk 421.