【摘 要】
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Making use of quasar spectra from LAMOST,in the spectral data around the Mg Ⅱ emission lines,research described in this paper has detected 217 Mg Ⅱ narrow abs
【机 构】
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College of Mathematics and Physics,Guangxi University for Nationalities,Nanning 530006,China;School
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Making use of quasar spectra from LAMOST,in the spectral data around the Mg Ⅱ emission lines,research described in this paper has detected 217 Mg Ⅱ narrow absorption lines (NALs) with Wλτ2796 ≥ 3σω and Wλτ2803 ≥ 2σω in a redshift range of 0.4554 ≤ zabs ≤ 2.1110.For quasars observed by both LAMOST and SDSS,we find that 135 Mg Ⅱ NALs were obviously observed in the LAMOST spectra,347 Mg Ⅱ NALs were were apparent in the SDSS spectra,and 132 Mg Ⅱ NALs were clearly present in both the SDSS and LAMOST spectra.The missed Mg Ⅱ NALs are likely ascribed to low signal-to-noise ratios of corresponding spectra.Among the Mg Ⅱ NALs obviously observed in SDSS or LAMOST spectra,eight Mg Ⅱ NALs were significantly changed with |△Wλτ2796| ≥ 3σω in time intervals of △MJD/(1 + zem) =359-2819 d.
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