Fermi Blazars in the Zwicky Transient Facility Survey:Properties of Large Optical Variations  

作　　者：Si-Si Sun Zhong-Xiang Wang Shun-Hao Ji 

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》2024年第10期104-115,共12页天文和天体物理学研究（英文版）

基　　金：supported by the National Science Foundation under Grant No.AST-2034437 and a collaboration including Caltech,IPAC;supported by the Basic Research Program of Yunnan Province(No.202201AS070005);the National Natural Science Foundation of China(NSFC,grant No.12273033);the Original Innovation Program of the Chinese Academy of Sciences(E085021002);the support of the science research program for graduate students of Yunnan University(KC-23234629)。

摘　　要：We analyze the optical light curve data,obtained with the Zwicky Transient Facility(ZTF)survey,for 47 γ-ray blazars monitored by the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope(Fermi).These 47sources are selected because they are among the Fermi blazars with the largest optical variations in the ZTF data.Two color-magnitude variation patterns are seen in them,with one being redder-to-stable-when-brighter(RSWB;in 31 sources)and the other being stable when brighter(in 16 sources).The patterns fit with the results recently reported in several similar studies with different data.Moreover,we find that the colors in the stable state of the sources share similar values,for which(after being corrected for the Galactic extinction)most sources are in a range of 0.4–0.55.This feature could be intrinsic and may be applied in,for example,study of the intragalactic medium.We also determine the turning points for the sources showing the RSWB pattern,after which the color changes saturate and become stable.We find a correlation between optical fluxes and γ-ray fluxes at the turning points.The physical implications of the correlation remain to be investigated,probably better with a sample of high-qualityγ-ray flux measurements.

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

分 类 号：P157.6[天文地球—天文学]