NGC 4117:A New Compton-thick AGN Revealed by Broadband X-Ray Spectral Analysis  

作　　者：Pavithra Mohanadas Adlyka Annuar 

机构地区：[1]Department of Applied Physics,Faculty of Science and Technology,Universiti Kebangsaan Malaysia,43600 UKM Bangi,Selangor,Malaysia

出　　处：《Research in Astronomy and Astrophysics》2023年第5期19-26,共8页天文和天体物理学研究（英文版）

基　　金：the support provided for this research from Fundamental Research Grant Scheme code FRGS/1/2019/ STG02/UKM/02/7, which is funded by the Malaysian Ministry of Higher Education (MoHE)。

摘　　要：In this paper,we present the broadband(0.5–195 keV)X-ray spectral analysis for one of the newly detected AGNs in the Swift-BAT 105 month Hard X-ray Survey Catalog,NGC 4117.According to our ongoing research on low luminosity AGNs from the Swift-BAT 105 month catalog,we examine whether they are indeed low luminosity or heavily obscured AGNs.One of the AGNs in our sample is NGC 4117,where we discover it could be potentially a CTAGN.Therefore to examine NGC 4117 in detail,we combined the high energy Swift-BAT data with low energy data from XMM-Newton and Swift-XRT,and fitted the spectra simultaneously using physically-motivated models.A high absorption occurred at lower energies,i.e.,below 3 keV.Past studies suggested that NGC 4117was heavily obscured with a large column density(~10^(23)cm^(-2)).Our fitting suggests that this AGN is in the Compton-thick regime with a predicted line-of-sight column density(N_(H,los))of 3.82×1024cm^(-2)and a torus column density(N_(H,tor))of 3.07×10^(24)cm^(-2).Both models yield intrinsic luminosity of 1.03×10^(42)erg s^(-1)at 2–10 keV while our bolometric luminosity is 2.05×10^(43)erg s^(-1),indicating that NGC 4117 is not an intrinsically low luminosity AGN.Rather,it is a standard AGN.The value of Eddington ratio that we obtained is 0.22,suggesting a very high accretion rate for this AGN.

关 键 词：galaxies active-X-rays galaxies-techniques spectroscopic 

分 类 号：P172.2[天文地球—天文学]