Four Years of Extreme Ultraviolet Observations of Markarian 421: II. Temporal Analysis

Details Four Years of Extreme Ultraviolet Observations of Markarian 421: II. Temporal Analysis Four Years of Extreme Ultraviolet Observations of Markarian 421: II. Temporal Analysis

2000-06-19

arxiv.org/abs/astro-ph/0006255v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the Astrophysical Journal. 16 pages, 14 Postscript figures, 3 Tables

Scientific paper

10.1086/318303

The Extreme Ultraviolet Explorer (EUVE) satellite accumulated ~one million seconds of public data between 1994 and 1997 for the BL Lacertae object Markarian 421. This is the second of two papers in which we present the results of spectral and temporal analysis of this EUVE data set. We analyze in the present paper the imaging data by means of power spectrum and structure function techniques, while the spectral analysis is presented in a companion paper. We find for MRK 421 a power spectrum with slope -2.14 +- 0.28 with a break at ~3 days. This is the first time that a break in the power spectrum of a BL Lacertae object has been found. We also find evidence of non-stationarity for MRK 421 EUV emission

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