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

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

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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 47 sources 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-quality γ-ray flux measurements.

(galaxies:)BL Lacertae objectsgeneral-(galaxies:)quasarsgeneral-gamma-raysgalaxies

Si-Si Sun、Zhong-Xiang Wang、Shun-Hao Ji

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Department of Astronomy,School of Physics and Astronomy,Yunnan University,Kunming 650091,China

Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China

National Science FoundationBasic Research Program of Yunnan ProvinceNational Natural Science Foundation of China(NSFC)Original Innovation Program of the Chinese Academy of Sciencesscience research program for graduate students of Yunnan University

AST-2034437202201AS07000512273033E085021002KC-23234629

2024

10.1088/1674-4527/ad79b2

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(10)