Measuring the Time Variation of the Fine-structure Constant with Quasars Detected by LAMOST  

作　　者：Jin-Nan Wei Rui-jie Chen Jun-Jie Wei Martín López-Corredoira Xue-Feng Wu 魏晋南;陈睿劼;魏俊杰;Martín López-Corredoira;吴雪峰(Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China;School of Astronomy and Space Sciences,University of Science and Technology of China,Hefei 230026,China;Shanghai Astronomy Museum(branch of Shanghai Science&Technology Museum),Shanghai 201306,China;Department of Physics,Imperial College London,London SW72AZ,UK;Instituto de Astrofísica de Canarias,E-38205 La Laguna,Tenerife,Spain;PIFI-Visiting Scientist 2023 of China Academy of Sciences at Purple Mountain Observatory,Nanjing 210023;National Astronomical Observatories,Beijing 100101,China;Departamento de Astrofísica,Universidad de La Laguna,E-38206 La Laguna,Tenerife,Spain)

机构地区：[1]Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China [2]School of Astronomy and Space Sciences,University of Science and Technology of China,Hefei 230026,China [3]Shanghai Astronomy Museum(branch of Shanghai Science&Technology Museum),Shanghai 201306,China [4]Department of Physics,Imperial College London,London SW72AZ,UK [5]Instituto de Astrofísica de Canarias,E-38205 La Laguna,Tenerife,Spain [6]PIFI-Visiting Scientist 2023 of China Academy of Sciences at Purple Mountain Observatory,Nanjing 210023 [7]National Astronomical Observatories,Beijing 100101,China [8]Departamento de Astrofísica,Universidad de La Laguna,E-38206 La Laguna,Tenerife,Spain

出　　处：《Research in Astronomy and Astrophysics》2024年第12期229-235,共7页天文和天体物理学研究(英文版)

基　　金：supported by the National Natural Science Foundation of China(grant Nos.12422307,12373053,and 12321003);the Key Research Program of Frontier Sciences(grant No.ZDBS-LY-7014);Chinese Academy of Sciences,and the Natural Science Foundation of Jiangsu Province(grant No.BK20221562);supported by the Chinese Academy of Sciences President's International Fellowship Initiative(grant No.2023VMB0001)。

摘　　要：The[O iii]λλ4960,5008 emission lines in the optical spectra of galaxies and quasars have been widely used to investigate the possible variation of the fine-structure constantαover cosmic time.In this work,we utilize the Large Sky Area Multi-object Fiber Spectroscopic Telescope(LAMOST)quasar survey,for the first time,to measure the relativeαvariationΔα/αin time through the[O iii]doublet method.From the LAMOST Data Release 9 quasar catalog,we refine a sample of 209 quasar spectra with strong and narrow[O iii]emission lines over a redshift range of 0<z<0.8.Analysis on all of the 209 spectra obtainsΔα/α=(0.5±3.7)×10^(−4),which suggests that there is no evidence of varyingαon the explored cosmological timescales.Assuming a linear variation,the mean rate of change inΔα/αis limited to be(−3.4±2.4)×10^(−13)yr^(−1)in the last 7.0 Gyr.While our LAMOST-based constraint on Δα/α is not competitive with those of the Sloan Digital Sky Survey(SDSS)quasar observations,our analysis serves to corroborate the results of SDSS with another independent survey.

关 键 词：atomic data-(galaxies) QUASARS emission lines-surveys-cosmology observations 

分 类 号：P158[天文地球—天文学]