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# The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release Six to Nine

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Dec 2022

We report the fourth installment in the series of the Large Sky AreaMulti-Object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey, whichincludes quasars observed between September, 2017 and June, 2021. There are intotal 13,066 quasars reliably identified, of which 6,685 are newly discoveredthat are not reported in the SDSS DR14 quasar catalog or Million Quasarscatalog. Because LAMOST does not provide accurate absolute flux calibration, were-calibrate the spectra with the SDSS/Pan-STARRS1 multi-band photometric data.The emission line properties of H$\alpha$, H$\beta$, Mg\,{\sc ii} and C\,{\sciv}, and the continuum luminosities are measured by fitting the re-calibratedspectra. We also estimate the single-epoch virial black hole masses ($\rmM_{BH}$) using the derived emission line and continuum parameters. This is thefirst time that the emission line and continuum fluxes were estimated based onLAMOST re-calibrated quasar spectra. The catalog and spectra for these quasarsare available online. After the nine-year LAMOST quasar survey, there are intotal 56,175 identified quasars, of which 24,127 are newly discovered. TheLAMOST quasar survey not only discovers a great number of new quasars, but alsoprovides a database for investigating the spectral variability of the quasarsobserved by both LAMOST and SDSS, and finding rare quasars includingchanging-look quasars and broad absorption line quasars.

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