Multicolor Optical Monitoring of the γ-Ray Emitting Narrow-line Seyfert 1 Galaxy PMN J0948+0022 from 2020 to 2021  

作　　者：Yu-Xin Xin Ding-Rong Xiong Jin-Ming Bai Hong-Tao Liu Kai-Xing Lu Ji-Rong Mao 

机构地区：[1]Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Key Laboratory for the Structure and Evolution of Celestial Objects,Chinese Academy of Sciences,Kunming 650216,China [4]Center for Astronomical Mega-Science,Chinese Academy of Sciences,Beijing 100101,China

出　　处：《Research in Astronomy and Astrophysics》2022年第7期60-72,共13页天文和天体物理学研究（英文版）

基　　金：supported by the National Key R&D Program of China with No. 2021YFA1600404;the National Natural Science Foundation of China (NSFC, grant Nos. 11991051, Y911080201, 12073068, 11673062, 11703077, 11703078);the CAS “Light of West China” Program, the Yunnan Province Foundation (2019FB004, 202001AT070069);Yunnan Province Youth Top Talent Project (YNWR-QNBJ-2020-116);the science research grants from the China Manned Space Project with NO. CMS-CSST-2021-A06 and CMS-CSST2021-A05。

摘　　要：In order to study the physical properties of the γ-ray emitting narrow-line Seyfert 1(NLS1) galaxy population,photometric and spectral observations of the γ-ray emitting NLS1 PMN J0948+0022 were made with the Lijiang2.4 m optical telescope of Yunnan Observatories,Chinese Academy of Sciences.Photometric data in the B and R bands were collected for 50 nights from 2020 January to 2021 December.During the observation epoch,the variability amplitudes are 73.67% in the B band and 79.96% in the R band.Intra-day variability is found in two observation nights,and the duty cycle value is 29% with variability amplitude> 12.9% in the R band,which support the presence of the relativistic jets in the target.The redder-when-brighter(RWB) chromatic trend(or steeper-when-brighter trend) appears on intra-day and long timescales.The RWB trend is dominated by the radiation of accretion disk and jet,and resembles those in flat spectrum radio quasars.When PMN J0948+0022 is brighter than 17.5 in the R band,there is no color change trend.By analyzing the spectral data of PMN J0948+0022,we obtained the black hole mass of M.=1.61×10^(7) Mand accretion rate of M=93,and confirmed that PMN J0948+0022 is a super-Eddington accreting NLS1.The redshifts of reverberation mapped super-Eddington accreting active galactic nuclei can be expanded by PMN J0948+0022 up to above 0.5.Super-Eddington accreting NLS1 galaxies were chosen as a new type of cosmological candle in the literature.PMN J0948+0022 may be used as a target for the next step of reverberation mapping monitoring project of super-Eddington accreting massive black holes.

关 键 词：galaxies:jets galaxies:photometry galaxies:Seyfert galaxies:active 

分 类 号：P152[天文地球—天文学]