Long-term Monitoring of the TeV Emission from Mrk 421 with the ARGO-YBJ Experiment

Details Long-term Monitoring of the TeV Emission from Mrk 421 with the ARGO-YBJ Experiment Long-term Monitoring of the TeV Emission from Mrk 421 with the ARGO-YBJ Experiment

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...734..110b&link_type=abstract

The Astrophysical Journal, Volume 734, Issue 2, article id. 110 (2011).

Astronomy and Astrophysics

Astronomy

9

Bl Lacertae Objects: Individual: Markarian 421, Gamma Rays: General

Scientific paper

ARGO-YBJ is an air shower detector array with a fully covered layer of resistive plate chambers. It is operated with a high duty cycle and a large field of view. It continuously monitors the northern sky at energies above 0.3 TeV. In this paper, we report a long-term monitoring of Mrk 421 over the period from 2007 November to 2010 February. This source was observed by the satellite-borne experiments Rossi X-ray Timing Explorer and Swift in the X-ray band. Mrk 421 was especially active in the first half of 2008. Many flares are observed in both X-ray and γ-ray bands simultaneously. The γ-ray flux observed by ARGO-YBJ has a clear correlation with the X-ray flux. No lag between the X-ray and γ-ray photons longer than 1 day is found. The evolution of the spectral energy distribution is investigated by measuring spectral indices at four different flux levels. Hardening of the spectra is observed in both X-ray and γ-ray bands. The γ-ray flux increases quadratically with the simultaneously measured X-ray flux. All these observational results strongly favor the synchrotron self-Compton process as the underlying radiative mechanism.

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