The IRAM key project: small-scale structure of pre-star forming regions. Combined mass spectra and scaling laws

Details The IRAM key project: small-scale structure of pre-star forming regions. Combined mass spectra and scaling laws The IRAM key project: small-scale structure of pre-star forming regions. Combined mass spectra and scaling laws

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...331l..65h&link_type=abstract

Astronomy and Astrophysics, v.331, p.L65-L68 (1998)

Astronomy and Astrophysics

Astrophysics

98

Interstellar Medium (Ism): Structure, Ism: Individual Objects: Polaris Flare, Ism: Kinematics And Dynamics, Turbulence

Scientific paper

One objective of the IRAM key project small-scale structure of pre-star forming regions is to determine the continuation of the mass spectra for molecular cloud fragments and other scaling laws from large scales down to smallest scales accessible with single-dish telescopes. In this Letter we present first results of the combination of the small scale data from this project and large scale data obtained with the CfA 1.2m and the KOSMA 3m telescopes for the Polaris Flare analyzed using a Gaussian clump decomposition. For data in the (12) CO J=1->0 and 2->1 lines we find no deviation from the power law slope of the mass spectra ({dN/ dM}~ M(-1.84) ), over a range in masses of more than at least 5 orders of magnitudes, from masses of several 10\mo\ down to Jupiter masses. The size spectrum is in agreement with a power law of the form {dN/ dr}~ r(-3.0) . The mass-size relation is a power law of the form M~ r(2.31) over a range of more than 2 orders of magnitudes in size. %

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