期刊
ASTROPHYSICAL JOURNAL
卷 766, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/766/1/16
关键词
BL Lacertae objects: general; BL Lacertae objects: individual (W2R1926+42); galaxies: active
资金
- Kepler GO program through NASA [NNX11AC81G, NNX12AC93G, NNX13AC26G]
- NASA Applied Information Systems Research Program
- STFC [ST/K001000/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K001000/1] Funding Source: researchfish
We present the first Kepler monitoring of a strongly variable BL Lac, W2R1926+42. The light curve covers 181 days with similar to 0.2% errors, 30 minute sampling and >90% duty cycle, showing numerous delta I/I>25% flares over timescales as short as a day. The flux distribution is highly skewed and non-Gaussian. The variability shows a strong rms-flux correlation with the clearest evidence to date for nonlinearity in this relation. We introduce a method to measure periodograms from the discrete autocorrelation function, an approach that may be well-suited to a wide range of Kepler data. The periodogram is not consistent with a simple power-law, but shows a flattening at frequencies below 7 x 10(-5) Hz. Simple models of the power spectrum, such as a broken power law, do not produce acceptable fits, indicating that the Kepler blazar light curve requires more sophisticated mathematical and physical descriptions than currently in use.
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