July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

4.5-year simultaneous multi-wavelength observation of Mrk 421 in ARGO-YBJ and Fermi overlap era

Aug 3, 2015, 12:15 PM
Word Forum Theater (World Forum)

Word Forum Theater

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution GA-EX Parallel GA12 EGAL


Silvia Vernetto (Istituto Nazionale di Astrofisica)


As one of the most active blazars, Mrk421 is an excellent candidate for the study of the physical processes within the jets of AGN. Here we report on the extensive multi-wavelength observations of Mrk 421 over 4.5 years, from 2008 August to 2013 February. This source was simultaneously monitored by several experiments at different wavelengths: the ARGO-YBJ detector at gamma-ray energies above 0.3 TeV, Fermi-LAT at 0.1-300 GeV, Swift-BAT in hard X-rays, RXTE-ASM, MAXI and Swift-XRT in soft X-rays, and Swift-UVOT in the ultraviolet and optical ranges. According to the observed light curves, ten states (including seven large flares, two quiescent phases and one outburst) were selected. For the first time, the multi-wavelength spectral evolutions of Mrk 421 during different states were systematically analyzed. The one-zone synchrotron self-Compton model was adopted to investigate the intrinsic mechanisms.
Registration number following "ICRC2015-I/" 207

Primary author

Songzhan Chen (Institute of High Energy Physics(IHEP), CAS)


Silvia Vernetto (Istituto Nazionale di Astrofisica)

Presentation materials

There are no materials yet.