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

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

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A warm corona has been widely proposed to explain the soft excess(SE)in X-ray above the 2-10 keV power law extrapolation in Active Galactic Nuclei(AGNs).In actual spectral fittings,the warm coronal seed photon temperature(Ts)is usually assumed to be far away from the soft X-ray,but kTs can reach close to 0.1 keV 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 that high Ts can influence the fitting results.A moderately high kTs(around 0.03 keV)can result in an apparent low-temperature and flat SE,while an extremely high kTs(around 0.07 keV)can even produce an unobserved blackbody-like SE.Our conclusions indicate that,for spectral fittings of the warm coronal radiation(SE in AGNs),kTs should be treated as a free parameter with an upper limit,and an accurate coronal geometry is necessary when kTs＞0.01 keV.

galaxies:activeaccretionaccretion disksblack hole physics

Ze-Yuan Tang、Jun-Jie Feng、Jun-Hui Fan

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School of Mathematics and Information Science,Guangzhou University,Guangzhou 510006,China

Center for Astrophysics,Guangzhou University,Guangzhou 510006,China

Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province,Guangzhou 510006,China

Key Laboratory for Astronomical Observation and Technology of Guangzhou,Guangzhou 510006,China

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National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)Natural Science Foundation of Guangdong ProvinceChina Manned Space ProjectAstrophysics Key Subjects of Guangdong Province and Guangzhou CityScientific and Technological Cooperation Projects(2020-2023)between the People's Republic of ChinaRepublic of Bulgaria,as well as support that was received from Guangzhou University

U2031201117330012019B030302001CMS-CSST-2021-A06YM2020001

2024

10.1088/1674-4527/ad4fc5

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(7)