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J/ApJ/668/1042 Dense cores in Perseus molecular cloud (Kirk+, 2007)
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Beginning of ReadMe :J/ApJ/668/1042 Dense cores in Perseus molecular cloud (Kirk+, 2007)
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Dynamics of dense cores in the Perseus molecular cloud.
Kirk H., Johnstone D., Tafalla M.
<Astrophys. J., 668, 1042-1063 (2007)>
=2007ApJ...668.1042K
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ADC_Keywords: Molecular clouds ; Infrared sources ; Millimetric/submm sources
Keywords: infrared: ISM - ISM: individual (Perseus) - ISM: structure -
stars: formation - submillimeter
Abstract:
We survey the kinematics of over 150 candidate (and potentially
star-forming) dense cores in the Perseus molecular cloud with pointed
N_2_H^+^(1-0) and simultaneous C^18^O(2-1) observations. Our detection
rate of N_2_H^+^ is 62%, rising to 84% for SCUBA-selected targets. In
agreement with previous observations, we find that the dense N_2_H^+^
targets tend to display nearly thermal line widths, particularly those
that appear to be starless (using Spitzer data), indicating that
turbulent support on the small scales of molecular clouds is minimal.
For those N_2_H^+^ targets that have an associated SCUBA dense core,
we find that their internal motions are more than sufficient to
provide support against the gravitational force on the cores.
Description:
We made pointed observations of the 157 targets using the 30m IRAM
telescope in Pico Veleta, Spain. We observed N_2_H^+^(1-0) in both
polarizations using the (AB) 100GHz receivers and simultaneously
observed C^18^O(2-1) in both polarizations using the (CD) 230GHz
receivers, in both cases utilizing frequency switching