期刊
ASTROPHYSICAL JOURNAL
卷 653, 期 2, 页码 L125-L128出版社
IOP PUBLISHING LTD
DOI: 10.1086/510620
关键词
ISM : clouds; ISM : kinematics and dynamics; ISM : structure
We test a method of estimating the power spectrum of turbulence in molecular clouds based on the comparison of power spectra of integrated intensity maps and single-velocity-channel maps, suggested by A. Lazarian and D. Pogosyan. We use synthetic (13)CO data from non-LTE radiative transfer calculations based on density and velocity fields of a simulation of supersonic hydrodynamic turbulence. We find that the method yields the correct power spectrum with good accuracy. We then apply the method to the Five College Radio Astronomy Observatory (13)CO map of the Perseus region, from the COMPLETE Web site. We find a power-law power spectrum with slope beta=1.81 +/- 0.10. The values of beta as a function of velocity resolution are also confirmed using the lower resolution map of the same region obtained with the AT&T Bell Laboratories antenna. Because of its small uncertainty, this result provides a useful constraint for numerical codes used to simulate molecular cloud turbulence.
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