A 6.7 GHz Methanol Maser Survey II. Low Galactic Latitudes
  We report the results of our systematic survey for Galactic 6.7 GHz Class II
CH$_3$OH maser emission toward a sample of young stellar objects. The survey
was conducted with the Shanghai Tianma Radio Telescope (TMRT). The sample
consists of 3348 sources selected from the all-sky \emph{Wide-Field Infrared
Survey Explorer (WISE)} point source catalog. We have discussed the selection
criteria in detail and the detection results of those at high Galactic
latitudes (i.e. $|b|>$ 2$^\circ$) in a previous paper (paper I). Here, we
present the results from the survey of those at low Galactic latitudes, i.e.
$|b|<2^\circ$. Of 1875 selected \emph{WISE} point sources, 291 positions that
were actually associated with 224 sources were detected with CH$_3$OH maser
emission. Among them, 32 are newly detected. Majority of the newly detected
sources are associated with bright WISE sources. The majority of the detected
sources (209/224 = 93.3\%) are quite close to the Galactic Plane
($|b|<1^\circ$) and lie on the inner spiral arms with positive LSR velocities.
Detection rate and the color-color distribution of our detection are all
matched with our anticipation. Combining with detections from previous surveys,
we compile a catalogue of 1085 sources with 6.7 GHz CH$_3$OH maser emission in
our Galaxy.
