SIMBAD references

2004ApJ...613..355K - Astrophys. J., 613, 355-373 (2004/September-3)

Radiative transfer and starless cores.


Abstract (from CDS):

We develop a method of analyzing radio-frequency spectral line observations to derive data on the temperature, density, velocity, and molecular abundance of the emitting gas. The method incorporates a radiative transfer code with a new technique for handling overlapping hyperfine emission lines within the accelerated Λ-iteration algorithm and a heuristic search algorithm based on simulated annealing. We apply this method to new observations of N2H+ in three Lynds clouds thought to be starless cores in the first stages of star formation and determine their density structure. A comparison of the gas densities derived from the molecular line emission and the millimeter dust emission suggests that the required dust mass opacity is about κ1.3mm=0.04 cm2/g, consistent with models of dust grains that have opacities enhanced by ice mantles and fluffy aggregrates.

Abstract Copyright:

Journal keyword(s): ISM: Individual: Alphanumeric: L1489 - ISM: Individual: Alphanumeric: L1517 - ISM: Individual: Alphanumeric: L1544 - ISM: Molecules - Radiative Transfer - Stars: Formation

Simbad objects: 6

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