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We present observations of the CO isotopologues ($^{12}$CO, $^{13}$CO, andC$^{18}$O) toward the Galactic region with $169\arcdeg.75 \leqslant l \leqslant174\arcdeg.75$ and $-0\arcdeg.75 \leqslant b \leqslant 0\arcdeg.5$, using thePurple Mountain Observatory 13.7~m millimeter-wavelength telescope. Based onthe $^{13}$CO~($J = 1-0$) data, we find five molecular clouds within thevelocity range between $-$25 and 8~km~s$^{-1}$ that are all characterized byconspicuous filamentary structures. We have identified eight filaments with alength of 6.38--28.45~pc, a mean H$_2$ column density of0.70$\times$10$^{21}$--6.53$\times$10$^{21}$~cm$^{-2}$, and a line mass of20.24--161.91~$M_\sun$ pc$^{-1}$, assuming a distance of $\sim$1.7~kpc.Gaussian fittings to the inner parts of the radial density profiles lead to amean FWHM width of 1.13$\pm$0.01~pc. The velocity structures of most filamentspresent continuous distributions with slight velocity gradients. We find thatturbulence is the dominant internal pressure to support the fragmentation offilaments instead of thermal pressure. Most filaments have virial parameterssmaller than 2; thus, they are gravitationally bound. Four filaments have anLTE line mass close to the virial line mass. We further extract dense clumpsusing the $^{13}$CO data and find that 64$\%$ of the clumps are associated withthe filaments. According to the complementary IR data, most filaments haveassociated Class~II young stellar objects. Class~I objects are mainly found tobe located in the filaments with a virial parameter close to 1. Within twovirialized filaments, $^{12}$CO outflows have been detected, indicating ongoingstar-forming activity therein.

astrophysical journal/the astrophysical journal

CO~($J=1-0$) Observations toward Filamentary Molecular Clouds in the  Galactic Region with $l = [169\arcdeg.75, 174\arcdeg.75], b = [-0\arcdeg.75,  0\arcdeg.5]$