H.E.S.S. Monitoring of PKS 2155-304 in 2015 and 2016

被引:9
作者
Wierzcholska, Alicja [1 ]
Zacharias, Michael [2 ,3 ]
Jankowsky, Felix [4 ]
Wagner, Stefan [4 ]
机构
[1] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland
[2] Ruhr Univ Bochum, Inst Theoret Phys Lehrstuhl Weltraum & Astrophys, D-44780 Bochum, Germany
[3] North West Univ, Ctr Space Sci, ZA-2520 Potchefstroom, South Africa
[4] Heidelberg Univ, D-69117 Heidelberg, Germany
基金
新加坡国家研究基金会; 英国科学技术设施理事会; 奥地利科学基金会; 澳大利亚研究理事会; 日本学术振兴会;
关键词
active galactic nuclei; blazar variability; multi-wavelength; GAMMA-RAY FLARE; SPECTRAL ENERGY-DISTRIBUTIONS; MULTIWAVELENGTH OBSERVATIONS; VARIABILITY PROPERTIES; S5 0716+714; RADIATION; VIEW; EMISSION; FERMI; ATOM;
D O I
10.3390/galaxies7010021
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
PKS 2155-304 is one of the brightest blazar located in Southern Hemisphere, monitored with H.E.S.S. since the first light of the experiment. Here we report multiwavelength monitoring observations collected during the period of 2015-2016 with H.E.S.S., Fermi-LAT, Swift-XRT, Swift-UVOT, and ATOM. Two years of multiwavelength data with very good temporal coverage allowed to characterize broadband emission observed from the region of PKS 2155-304 and study potential multifrequency correlations. During the period of monitoring, PKS 2155-304 revealed complex multiwavelength variability with two outbursts characterized by completely different multiband properties. The 2015 activity of the blazar is characterized by a flare observed at all wavelengths studied. The broadband emission observed during the outburst is well correlated without any time lags. Contrary to 2015, in 2016, only orphan outburst in the optical and ultraviolet wavelengths was observed. Such an orphan activity is reported for the first time for the blazar PKS 2155-304.
引用
收藏
页数:10
相关论文
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