FSRQ 0208-512的光学波段长周期光变分析和色指数变化研究  

Analysis of Long-period Optical Variation and Study on Color Index Variation about Optical Band in FSRQ 0208-512

作　　者：陆林 张皓晶 任国伟 张欢 晏培琳 马凯旋 LU Lin;ZHANG Hao-jing;REN Guo-wei;ZHANG Huan;YAN Pei-lin;MA Kai-xuan(Department of Physics,Yunnan Normal University,Kunming 650092;Department of Astronomy,Xiamen University,Xiamen 361005)

机构地区：[1]云南师范大学物理系,昆明650092 [2]厦门大学天文系,厦门361005

出　　处：《天文学报》2021年第3期121-130,共10页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(11063004);云南省中青年学术和技术带头人后备人才项目(2017HB020)资助。

摘　　要：从SMARTS(The Small and Moderate Aperture Research Telescope System)数据库,收集到了平谱射电类星体(FRSQ)0208-512天体光学波段B、V、R的观测数据,数据从2008年2月–2017年8月,时间跨度近10 yr.分别获得了光学B波段数据627组、V波段数据634组、R波段数据639组.通过加权小波Z变换法(WWZ)和蒙特卡洛模拟的LombScargle periodogram(LSP)方法研究得出了如下结论:(1)在两种方法中都得到了光学B、V、R 3个波段有可能存在396 d左右约为1.08 yr的周期性光变;(2)得到了B波段星等B与光学波段色指数(B-V)呈正相关关系,当B星等越小时色指数(B-V)越小,即越亮越蓝;(3)通过光学3个波段的1.08 yr的长周期光变得到天体中心黑洞质量M约为0.12×10^(6)M⊙,辐射区半径RM=1.052×10^(8)km,其中M⊙为太阳质量.The observational data of optical B,V,and R bands of the Flat Spectral Radio Quasar(FRSQ)0208-512 are collected from the Small and Moderate Aperture Research Telescope System(SMARTS)database.The data span nearly a decade from February 2008 to August 2017,which includes 627,639,and 634 sets of data in B,R,and V bands,respectively.The datasets are fully analyzed by the Weighted Wavelet Z Transform(WWZ)and the Monte-Carlo Simulation LombScargle Periodogram(LSP)method,the conclusions are as follows:(1)a 396 d period is obtained in all three optical bands,which is about 1.08 yr;(2)a positive relationship is found between the magnitude of B band(B)and the optical band color index(B-V),which means the smaller the magnitude B the smaller the color index(B-V),this is the so called BluerWhen-Brighter;(3)using the 1.08 yr long-period obtained from the optical bands,the central black hole mass M is derived as 0.12×10^(6) M⊙and the corresponding radius of the radiation zone RM=1.052×10^(8) km,here M⊙is the solar mass.

关 键 词：星系:活动 星系:核 方法:蒙特卡洛模拟 

分 类 号：P158[天文地球—天文学]