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2017ApJ...837..154N - Astrophys. J., 837, 154-154 (2017/March-2)

Wide-field 12CO (J=2-1) and 13CO (J=2-1) observations toward the Aquila Rift and Serpens molecular cloud complexes. I. Molecular clouds and their physical properties.


Abstract (from CDS):

We present the results of wide-field 12CO (J=2–1) and 13CO (J=2–1) observations toward the Aquila Rift and Serpens molecular cloud complexes (25l33 and 1b6) at an angular resolution of 3.'4 (~0.25 pc) and at a velocity resolution of 0.079 km s–1 with velocity coverage of -5 km s–1 VLSR 35 km s–1. We found that the 13CO emission better traces the structures seen in the extinction map, and derived the X_13CO-factor of this region. Applying SCIMES to the 13CO data cube, we identified 61 clouds and derived their mass, radii, and line widths. The line width-radius relation of the identified clouds basically follows those of nearby molecular clouds. The majority of the identified clouds are close to virial equilibrium, although the dispersion is large. By inspecting the 12CO channel maps by eye, we found several arcs that are spatially extended to 0.°2-3° in length. In the longitude-velocity diagrams of 12CO, we also found two spatially extended components that appear to converge toward Serpens South and the W40 region. The existence of two components with different velocities and arcs suggests that large-scale expanding bubbles and/or flows play a role in the formation and evolution of the Serpens South and W40 cloud.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: clouds - ISM: kinematics and dynamics - ISM: molecules - ISM: structure - stars: formation - stars: formation

Nomenclature: Tables 2-3: [NDS2017] NN (Nos 1-61).

Simbad objects: 75

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