2006A&A...445..591H


Query : 2006A&A...445..591H

2006A&A...445..591H - Astronomy and Astrophysics, volume 445, 591-600 (2006/1-2)

The formation of interstellar molecular lines in a turbulent velocity field with finite correlation length. IV. Physical parameters of Bok Gobules.

HEGMANN M., HENGEL C., ROELLIG M. and KEGEL W.H.

Abstract (from CDS):

We present observational line data for five Bok Globules. Observations were made in the J=2-1 and J=3-2 rotational transitions of CO, 13CO and C18O at the Heinrich-Hertz-Telescope in Arizona. Using the stochastic radiative transfer model (SRTM) based on the generalized radiative transfer equation as described in the previous papers of this series, we were able to fit the observed CO lines for four of the five Bok globules. The derived parameters such as the hydrogen density, the cloud mass and temperature in part differ significantly from values obtained from a standard LVG analysis or a microturbulent approach. The best fits are obtained for models characterized by a ratio of the mean free path of photons to the correlation length of the turbulent velocity field of the order of unity. This is what characterizes the mesoturbulent regime that cannot be adressed by standard evaluation methods like LVG or microturbulent approximations.

Abstract Copyright:

Journal keyword(s): radiative transfer - turbulence - ISM: clouds - ISM: lines and bands

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [DB2002b] G155.76+5.91 MoC 04 58 30 +52 15.7           ~ 40 0
2 LDN 1437 DNe 04 59 04.1 +52 03 24           ~ 19 0
3 [DB2002b] G55.48-2.22 MoC 19 42 31 +18 52.2           ~ 18 0
4 LDN 805 DNe 20 01 31 +24 42.8           ~ 17 0
5 LDN 1075 MoC 21 33 56 +54 41.5           ~ 21 0

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2021.09.27-08:02:17

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