Spectral Fittings of Warm Coronal Radiation with High Seed Photon Temperature:Apparent Low-temperature and Flat Soft Excess in AGNs  

作　　者：Ze-Yuan Tang Jun-Jie Feng Jun-Hui Fan 

机构地区：[1]School of Mathematics and Information Science,Guangzhou University,Guangzhou 510006,China [2]Center for Astrophysics,Guangzhou University,Guangzhou 510006,China [3]Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province,Guangzhou 510006,China [4]Key Laboratory for Astronomical Observation and Technology of Guangzhou,Guangzhou 510006,China

出　　处：《Research in Astronomy and Astrophysics》2024年第7期135-144,共10页天文和天体物理学研究（英文版）

基　　金：partially supported by the National Natural Science Foundation of China(NSFC,grant Nos.U2031201 and11733001);the Natural Science Foundation of Guangdong Province(2019B030302001);the science research grants from the China Manned Space Project,with No.CMS-CSST-2021-A06;support from Astrophysics Key Subjects of Guangdong Province and Guangzhou City;support from Scientific and Technological Cooperation Projects(2020-2023)between the People’s Republic of China and the Republic of Bulgaria;support that was received from Guangzhou University(No.YM2020001)。

摘　　要：A warm corona has been widely proposed to explain the soft excess(SE)in X-ray above the 2-10 ke V power law extrapolation in Active Galactic Nuclei(AGNs).In actual spectral fittings,the warm coronal seed photon temperature(T_s)is usually assumed to be far away from the soft X-ray,but kT_scan reach close to 0.1 ke V in the standard accretion disk model.In this study,we used Monte Carlo simulations to obtain radiation spectra from a slab-like warm corona and fitted the spectra using the spherical-geometry-based routine THCOMP or a thermal component.Our findings reveal tha high T_scan influence the fitting results.A moderately high kT_s(around 0.03 ke V)can result in an apparent low-temperature and flat SE,while an extremely high kT_s(around 0.07 ke V)can even produce an unobserved blackbody-like SE.Our conclusions indicate that,for spectral fittings of the warm coronal radiation(SE in AGNs),kT_sshould be treated as a free parameter with an upper limit,and an accurate coronal geometry is necessary when kT_s>0.01 ke V.

关 键 词：galaxies active-accretion-accretion disks-black hole physics 

分 类 号：P157.6[天文地球—天文学]