Mrk421: EUVE observations from 1994 to 1997

Details Mrk421: EUVE observations from 1994 to 1997 Mrk421: EUVE observations from 1994 to 1997

1998-12-02

arxiv.org/abs/astro-ph/9812036v1

Astronomy and Astrophysics

Astrophysics

2 pages, LaTeX, uses paspconf.sty, to appear in the Proceedings of the Conference "BL Lac Phenomenon", Turku, Finland, June 22

Scientific paper

We present spectral and timing analysis of all the data collected by the Extreme Ultraviolet Explorer for the BL Lac object Mrk 421 from 1994 to 1997. During these years Mrk 421 has been observed by EUVE 4 times with the DS/Spectrograph and 2 times with the imaging telescopes for a total of ~1.4 millions seconds. The total EUVE light curve seems to be smoothly varying on the long time-scale while on a shorter time-scale there is evidence of an EUVE flare correlated to the 1995 TeV flare. We analysed the three spectral data set in an homogenous way using the proper off-axis calibrations and checked for the existence of absorption features around ~70 A (Kartje et al.,97,ApJ,474,630). We also show the first power spectrum analysis of the Mrk 421 EUVE lightcurves and a comparison with the predictions by theoretical models (e.g. Celotti et al.,1991,ApJ,377,403).

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