Astrophys. J., Suppl. Ser., 226, 13-13 (2016/September-0)
The Arizona Radio Observatory CO mapping survey of galactic molecular clouds. V. The Sh2-235 cloud in CO J=2-1, 13CO J=2-1, and CO J=3-2.
BIEGING J.H., PATEL S., PETERS W.L., TOTH L.V., MARTON G. and ZAHORECZ S.
Abstract (from CDS):
We present the results of a program to map the Sh2-235 molecular cloud complex in the CO and ^13CO J=2 - 1 transitions using the Heinrich Hertz Submillimeter Telescope. The map resolution is 38'' (FWHM), with an rms noise of 0.12 K brightness temperature, for a velocity resolution of 0.34 km s^-1. With the same telescope, we also mapped the CO J=3 - 2 line at a frequency of 345 GHz, using a 64 beam focal plane array of heterodyne mixers, achieving a typical rms noise of 0.5 K brightness temperature with a velocity resolution of 0.23 km s^-1. The three spectral line data cubes are available for download. Much of the cloud appears to be slightly sub-thermally excited in the J=3 level, except for in the vicinity of the warmest and highest column density areas, which are currently forming stars. Using the CO and ^13CO J=2 - 1 lines, we employ an LTE model to derive the gas column density over the entire mapped region. Examining a 125 pc^2 region centered on the most active star formation in the vicinity of Sh2-235, we find that the young stellar object surface density scales as approximately the 1.6-power of the gas column density. The area distribution function of the gas is a steeply declining exponential function of gas column density. Comparison of the morphology of ionized and molecular gas suggests that the cloud is being substantially disrupted by expansion of the H ii regions, which may be triggering current star formation.
© 2016. The American Astronomical Society. All rights reserved.
ISM: clouds - ISM: individual objects: Sh2-235 - ISM: kinematics and dynamics - ISM: molecules - ISM: molecules
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