منابع مشابه
High Frequency Peakers: young radio sources or flaring blazars?
We present new, simultaneous, multifrequency observations of 45 out of the 55 candidate High Frequency Peakers (HFP) selected by Dallacasa et al. (2000), carried out 3 to 4 years after a first set of observations. Our sub-sample consists of 10 galaxies, 28 stellar objects (“quasars”) and 7 unidentified sources. Both sets of observations are sensitive enough to allow the detection of variability...
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Aims. The time evolution of the electromagnetic emission from blazars, in particular high frequency peaked sources (HBLs), displays irregular activity not yet understood. In this work we report a methodology capable of characterizing the time behavior of these variable objects. Methods. The Maximum Likelihood Blocks (MLBs) is a model-independent estimator which sub-divides the light curve into ...
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Preliminary results of a systematic study on the simultaneous optical-to-X-rays variability in blazars are presented. Data from Swift observations of four bright γ−ray blazars (3C 279, ON +231, S5 0716+71, PKS 2155−304) have been analyzed, compared, and discussed. Specifically, 3C 279 shows a variable flattening in the low energy part of the X-ray spectrum that appears to be confined in a speci...
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S. Adrián-Martínez , I. Al Samarai , A. Albert , M. André , M. Anghinolfi , G. Anton , S. Anvar , M. Ardid , T. Astraatmadja , J-J. Aubert , B. Baret , S. Basa , V. Bertin , S. Biagi , C. Bigongiari , C. Bogazzi , M. Bou-Cabo , B. Bouhou , M.C. Bouwhuis , J. Brunner , J. Busto , F. Camarena a A. Capone , C. Cârloganu , G. Carminati , J. Carr , S. Cecchini , Z. Charif , Ph. Charvis , T. Chiarusi...
متن کاملInferring the coronal flaring patterns in AGN from reverberation maps
The relativistically broadened iron K-α line at 6.4 keV observed in the Seyfert 1 galaxy MCG–6-30-15 has provided a probe of the strong-gravity environment near a black hole, in particular suggesting that it is rapidly spinning. An important variable in such analyses is the geometry of the illuminating source. We present a new technique which constrains this geometry based on the spectral line ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2011
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/736/2/128