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A FAST survey of H I narrow-line self-absorptions in <i>Planck</i> Galactic cold clumps guided by HC<sub>3</sub>N
Using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we search for H I narrow-line self-absorption (HINSA) features in twelve Planck Galactic cold clumps (PGCCs), the starless core L1521B, and four star forming sources. Eight of the 12 PGCCs have detected emission of J = 2–1 of cyanoacetylene (HC 3 N). …