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Quasars behind the Galactic plane (GPQs) are important astrometric referencesand valuable probes of Galactic gas, yet the search for GPQs is difficult dueto severe extinction and source crowding in the Galactic plane. In this paper,we present a sample of 204 spectroscopically confirmed GPQs at |b|<20{\deg},191 of which are new discoveries. This GPQ sample covers a wide redshift rangefrom 0.069 to 4.487. For the subset of 230 observed GPQ candidates, the lowerlimit of the purity of quasars is 85.2%, and the lower limit of the fraction ofstellar contaminants is 6.1%. Using a multicomponent spectral fitting, wemeasure the emission line and continuum flux of the GPQs, and estimate theirsingle-epoch virial black hole masses. Due to selection effects raised fromGalactic extinction and target magnitude, these GPQs have higher black holemasses and continuum luminosities in comparison to the SDSS DR7 quasar sample.The spectral-fitting results and black hole mass estimates are compiled into amain spectral catalog, and an extended spectral catalog of GPQs. The successfulidentifications prove the reliability of both our GPQ selection methods and theGPQ candidate catalog, shedding light on the astrometric and astrophysicalprograms that make use of a large sample of GPQs in the future.

Finding Quasars behind the Galactic Plane. II. Spectroscopic Identifications of 204 Quasars at $|b|< 20\deg$