Variability Properties of Mkn 421 across 6 orders of magnitude in timescales, and 3 in brightness

Details Variability Properties of Mkn 421 across 6 orders of magnitude in timescales, and 3 in brightness Variability Properties of Mkn 421 across 6 orders of magnitude in timescales, and 3 in brightness

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre11009f&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We will present the analysis of the 10-day RossiXTE observation performed in 2001, as part of the campaign with simultaneous TeV and optical observations. The source reached a flux of almost 1e-8 c.g.s. and the very high throughput allows us to probe the variability on very short timescales, i.e. down to a few minutes. Together with past BeppoSAX observations we now have a dataset covering an unprecedented range of timescales and fluxes, providing us with the best leverage ever to address the questions on the physical properties of this type of relativistic jet sources. We will discuss the main features of the timing analysis, from structure function and periodogram analyses, including tentative evidence of a recurrence timescale for major flares. This could possibly be interpreted as signature of some characteristic of the jet formation process, in the framework of the internal shock model, now revived also for blazars. Moreover we will present the extension -with the 2001 data- of the E_peak vs. L relationship, and a few highlights of the simultaneous TeV/Optical observations.

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