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

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

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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 constant α over 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 relative α variation Δα/α in time through the[OⅢ]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 obtains Δα/α=(0.5±3.7)×10-4,which suggests that there is no evidence of varying α on the explored cosmological timescales.Assuming a linear variation,the mean rate of change in Δα/α is 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.

atomic data(galaxies:)quasars:emission linessurveyscosmology:observations

魏晋南、陈睿劫、魏俊杰、Martín López-Corredoira、吴雪峰

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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 SW7 2AZ,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 and National Astronomical Observatories,Beijing 100101,China

Departamento de Astrofísica,Universidad de La Laguna,E-38206 La Laguna,Tenerife,Spain

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2024

10.1088/1674-4527/ad9654

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(12)