BL Lac的光学多普勒因子估算  

Optical Doppler Factor Estimation for BL Lac

作　　者：黄家伟 潘树蓉 吴健 叶旭鸿 曹健鸿 樊军辉[3,4,5] HUANG Jia-wei;PAN Shu-rong;WU Jian;YE Xu-hong;CAO Jian-hong;FAN Jun-hui(Department of Physics and Material Science,Guangzhou University,Guangzhou 510006;Dipartimento di Fisica e Astronomia\G.Galilei",Universitadi Padova,Padova 35131;Center for Astrophysics,Guangzhou University,Guangzhou 510006;Guangdong-Hong Kong-Macao Greater Bay Area,National Astronomical Science Data Center,Guangzhou 510006;Key Laboratory for Astronomical Observation and Technology,Higher Education School of Guangdong Province,Guangzhou 510006)

机构地区：[1]广州大学物理与材料科学学院,广州510006 [2]帕多瓦大学“G.Galilei”物理与天文学院,帕多瓦35131 [3]广州大学天体物理中心,广州510006 [4]国家天文科学数据中心大湾区分中心,广州510006 [5]广东省高等学校天文观测与技术重点实验室,广州510006

出　　处：《天文学报》2024年第5期70-77,共8页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(U2031201、11733001);科技部国际交流司中保交流项目(国科外[2020]16号);中国载人航天工程项目(CMS-CSST-2021-A06);广东省自然科学基金项目(2019B030302001)资助。

摘　　要：蝎虎天体(BL Lacertae object,BL Lac)是一类特殊的活动星系核,表现出极端的观测特征,如高光度和偏振、快速光变、超光速运动、射电核主导、极高能辐射等,极端观测特性可能都与喷流效应有关,而表征喷流效应的物理量是多普勒因子(Doppler factor).多普勒因子有助于了解BL Lac的辐射物理和本征特性.基于BL Lac和Fanaroff-Riley typeⅠ/Fanaroff-Riley typeⅡ(G)的统一模型思路,提出BL Lac的本征视星等与红移(哈勃图)的分布应该与FRⅠ/FRⅡ(G)的观测视星等与红移的分布相似,并提出了估算BL Lac的光学多普勒因子的方法.该方法所估算的多普勒因子与前人的光学多普勒因子比较具有很好的相关性,说明该光学波段估算BL Lac多普勒因子的方法是可靠的.BL Lacertae object(BL Lac),a subclass of Active Galactic Nucleus(AGN),exhibit extreme observational properties:such as high luminosity and polarization,rapid variability,superluminal motion,radio core dominance,and highly energic emission.These observational properties are related to the beaming effect,which is quantified by Doppler factor.Doppler factor is helpful to understand the radiation physics and intrinsic characteristic of BL Lac.Based on the unified scheme of BL Lac and Fanaroff-Riley Ⅰ/Fanaroff-Riley Ⅱ(G),the author proposed that the distribution of intrinsic apparent magnitude vs redshift(Hubble diagram)for BL Lac should be similar to that of the observed apparent magnitude and redshift of FRⅠ/FRⅡ(G),and provided a method to estimate the optical Doppler factor of BL Lac.The researchers compared this Doppler factor estimation with the optical Doppler factor of the predecessor and found a close correlation between them.This result suggests that the method to estimate Doppler factor is reliable for depicting the beaming effect in the optical band of BL Lac.

关 键 词：蝎虎天体:普通 星系:活动 星系:距离和红移 星系:喷流 

分 类 号：P157[天文地球—天文学]