On the systematic bias in the estimation of black hole masses in active galactic nuclei  

作　　者：WANG JianGuo DONG XiaoBo 

机构地区：[1]Yunnan Observatories,Chinese Academy of Sciences [2]Key Laboratory for the Structure and Evolution of Celestial Objects,Chinese Academy of Sciences [3]Graduate University of Chinese Academy of Sciences [4]Key Laboratory for Research in Galaxies and Cosmology,University of Science and Technology of China [5]Center for Astrophysics,University of Science and Technology of China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2014年第3期584-588,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2009CB824800);the National Natural Science Foundation of China(Grant Nos.11303085,11073019,10973034,11033007,11133006 and 11103071);the Western Light Youth Project

摘　　要：In this report, we find the MBH estimated from the formalism of Wang et al. are more consistent with those from the MBH-δ, relation than those from previous single-epoch mass estimators, using a large sample of AGNs. Furthermore, we examine the differences between the line widths of Hβ and Mg II in detail by comparing their line profiles. The flux around the line core and that in the wing of both Hβ and Mg II show an opposite variation tendency, which indicates the BLR is multi-componential. The contribution of the wing makes the FWHM deviate from δline, and thus bias the MBH estimated from previous single-epoch mass estimators. Thus the correction on the formalism suggested by Wang et al. is crucial to MBn estimation.In this report,we find the MBH estimated from the formalism of Wang et al.are more consistent with those from the MBH-σ relation than those from previous single-epoch mass estimators,using a large sample of AGNs.Furthermore,we examine the diferences between the line widths of Hβ and Mg Ⅱ in detail by comparing their line profiles.The flux around the line core and that in the wing of both Hβ and Mg Ⅱ show an opposite variation tendency,which indicates the BLR is multi-componential.The contribution of the wing makes the FWHM deviate fromσline,and thus bias the MBH estimated from previous single-epoch mass estimators.Thus the correction on the formalism suggested by Wang et al.is crucial to MBH estimation.

关 键 词：QUASARS galactic nuclei MASSES statistical and correlative studies of properties 

分 类 号：P145.8[天文地球—天体物理]