Kavli Affiliate: Linhua Jiang
| First 5 Authors: Yuming Fu, Xue-Bing Wu, Linhua Jiang, Yanxia Zhang, Zhi-Ying Huo
| Summary:
Quasars behind the Galactic plane (GPQs) are important astrometric references
and valuable probes of the Galactic gas, yet the search of GPQs is difficult
due to severe extinction and source crowding in the Galactic plane. In this
paper, we present a sample of 204 spectroscopically confirmed GPQs at $|b|<
20deg$, 191 of which are new discoveries. This GPQ sample covers a wide
redshift range from 0.069 to 4.487. For the subset of 230 observed GPQ
candidates, the lower limit of the purity of quasars is 85.2%, and the lower
limit of the fraction of stellar contaminants is 6.1%. Using a multi-component
spectral fitting, we measure the emission line and continuum flux of the GPQs,
and estimate their single-epoch virial black hole masses. Due to selection
effects raised from Galactic extinction and target magnitude, these GPQs have
higher black hole masses and continuum luminosities in comparison to the SDSS
DR7 quasar sample. The spectral fitting results and black hole mass estimates
are compiled into a main spectral catalog, and an extended spectral catalog of
GPQs. The successful identifications prove the reliability of both our GPQ
selection methods and the GPQ candidate catalog, shedding light on the
astrometric and astrophysical programs that make use of a large sample of GPQs
in the future.
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