Astrophys. J., 921, 23-23 (2021/November-1)
A wide-field CO survey toward the California molecular filament.
GUO W., CHEN X., FENG J., SUN L., WANG C., SU Y., SUN Y., AO Y., ZHANG S., ZHOU X., YUAN L. and YANG J.
Abstract (from CDS):
We present the survey of 12CO/13CO/C18O (J = 1 - 0) toward the California molecular cloud (CMC) within the region of 161.°75 <= l <= 167.°75, -9.°5 <= b <= -7.°5 using the Purple Mountain Observatory (PMO) 13.7 m millimeter telescope. Adopting a distance of 470 pc, the mass of the observed molecular cloud estimated from 12CO, 13CO, and C18O is about 2.59 x 104, 0.85 x 104, and 0.09 x 104 M☉, respectively. A large-scale continuous filament extending about 72 pc is revealed from the 13CO images. A systematic velocity gradient perpendicular to the major axis appears and is measured to be ∼0.82 km s–1 pc–1. The kinematics along the filament shows an oscillation pattern with a fragmentation wavelength of ∼2.3 pc and velocity amplitude of ∼0.92 km s–1, which may be related to core-forming flows. Furthermore, assuming an inclination angle to the plane of the sky of 45°, the estimated average accretion rate is ∼101 M☉ Myr–1 for the cluster LkHα 101 and ∼21 M☉ Myr–1 for the other regions. In the C18O observations, the large-scale filament could be resolved into multiple substructures, and their dynamics are consistent with the scenario of filament formation from converging flows. Approximately 225 C18O cores are extracted, of which 181 are starless cores. Roughly 37% (67/181) of the starless cores have αvir less than 1. Twenty outflow candidates are identified along the filament. Our results indicate active early-phase star formation along the large-scale filament in the CMC region.
© 2021. The Author(s). Published by the American Astronomical Society.
Interstellar medium - Interstellar filaments - Giant molecular clouds - Star formation
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