2000/06/19 by Ilaria Cagnoni, I. Cagnoni, Antonella Fruscione +2 · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #BL Lac object #Blazar #Computer science #Data set #Extreme ultraviolet #Extreme ultraviolet lithography #Gamma ray #Gamma-ray bursts and supernovae #Optics #Physics #Radio Astronomy Observations and Technology #Satellite #Spectral analysis #Spectral density #Spectroscopy #astro-ph
paper · pdf · doi:10.1086/318303
Accepted for publication in the Astrophysical Journal. 16 pages, 14 Postscript figures, 3 Tables
arxiv created 2000/06/19 · openalex publication_date 2001/01/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The Extreme Ultraviolet Explorer ( EUVE ) satellite accumulated ~1,000,000 s 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 nonstationarity for Mrk 421 EUV emission.