کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1778875 1523742 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Long-term optical and radio variability of BL Lacertae
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
Long-term optical and radio variability of BL Lacertae
چکیده انگلیسی
Well-sampled optical and radio light curves of BL Lacertae in B,V,R,I bands and 4.8, 8.0, 14.5 GHz from 1968 to 2014 were presented in this paper. A possible 1.26±0.05 yr period in optical bands and a 7.50±0.15 yr period in radio bands were detected based on discrete correlation function, structure function as well as Jurkevich method. Correlations among different bands were also analyzed and no reliable time delay was found between optical bands. Very weak correlations were detected between V band and radio bands. However, in radio bands the variation at low frequency lagged that at high frequency obviously. The spectrum of BL Lacertae turned mildly bluer when the object turned brighter, and stronger bluer-when-brighter trends were found for short flares. A scenario including a precessing helical jet and periodic shocks was put forward to interpret the variation characteristics of BL Lacertae.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: New Astronomy - Volume 36, April 2015, Pages 9-18
نویسندگان
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