Fermi Blazars in the Zwicky Transient Facility Survey:A Correlation Study  

作　　者：Si-Si Sun Zhong-Xiang Wang Yi Xing 

机构地区：[1]Department of Astronomy,School of Physics and Astronomy,Yunnan University,Kunming 650091,China [2]Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China

出　　处：《Research in Astronomy and Astrophysics》2023年第7期64-79,共16页天文和天体物理学研究（英文版）

基　　金：supported by Basic Research Program of Yunnan Province(No.202201AS070005);the National Natural Science Foundation of China(12273033);the Original Innovation Program of the Chinese Academy of Sciences(E085021002)。

摘　　要：We report on our correlation analysis for theγ-ray blazars detected with the Large Area Telescope(LAT)onboard the Fermi Gamma-ray Space Telescope(Fermi),for which we use the Fermi-LAT data and the optical zr and zg band data from the Zwicky Transient Facility survey in the time period approximately from 2018 July to 2022February.We start from the full sample of the Fermi-LAT blazars and find~38%of them as significant variables in bothγ-ray and optical bands.Among the variables,which are 705 blazars,95 are selected as our targets based on the requirement for theγ-ray brightnesses.Then 15 out of the 95 blazars are found to show theγ-ray-optical correlations in the~3.7 yr time period.Most of the 15 blazars are classified as low synchrotron peaked(LSP)ones with the time lags between theγ-ray and optical bands in a range from-19 to+25 days.The results generally fit the often-considered emission scenario for the LSP blazars.Two cases of showing~-100 days time lags are discussed,which require farther studies for confirmation.Our analysis results suggest that among the detected significant variables,~23%LSPs can showγ-ray and optical correlations,while their averageγ-ray fluxes are above~4×10^(-8)photon cm^(-2)s^(-1).

关 键 词：gamma-rays:galaxies (galaxies:)quasars:general (galaxies:)BL Lacertae objects:general 

分 类 号：P172.3[天文地球—天文学]