2003ApJ...595..824B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.16CEST00:46:02

2003ApJ...595..824B - Astrophys. J., 595, 824-841 (2003/October-1)

Intrinsic, observed, and retrieved properties of interstellar turbulence.

BRUNT C.M., HEYER M.H., VAZQUEZ-SEMADENI E. and PICHARDO B.

Abstract (from CDS):

We generate synthetic observations of three-dimensional, self-gravitating MHD simulations of the interstellar medium (ISM) to evaluate the ability of principal component analysis (PCA) to measure the scale dependence of turbulent velocity fluctuations in molecular clouds. Scaling exponents, α, observationally obtained from the coupled characteristic scales for line profile variability in velocity, δv, and in space, L, where δv∝Lα, are compared with the intrinsic scaling exponents of the MHD velocity fields. We determine the approximate structure function order at which PCA operates in order to then verify a previously established calibration of the PCA method. We also analyze the statistical properties of projected velocity line centroid fields, including effects of intermittent velocity fluctuations, density inhomogeneity, and opacity, and examine the relationship of the projected two-dimensional statistics to the intrinsic three-dimensional statistics. Using PCA, we infer steep three-dimensional energy spectra in the molecular ISM, generally steeper than can be accounted for by Kolmogorov turbulence or possibly even shock-dominated turbulence.

Abstract Copyright:

Journal keyword(s): ISM: Clouds - ISM: Kinematics and Dynamics - Methods: Statistical - Magnetohydrodynamics: MHD - Radio Lines: ISM - Turbulence

Simbad objects: 11

goto Full paper

goto View the reference in ADS

Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 942 3
2 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1006 0
3 M 42 HII 05 35 17.3 -05 23 28           ~ 3657 0
4 NAME Ori A MoC 05 38 -07.1           ~ 2610 0
5 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 690 1
6 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1126 0
7 NAME Mon R2 HII 06 07 46.6 -06 22 59           ~ 633 2
8 Ass Gem OB 1 As* 06 09.8 +21 35           ~ 155 0
9 NAME Polaris Flare MoC 11 00 14.8 +86 10 52           ~ 157 1
10 W 51 SNR 19 23 50 +14 06.0           ~ 1118 1
11 NGC 7538 OpC 23 13 37 +61 30.0           ~ 814 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2003ApJ...595..824B and select 'bookmark this link' or equivalent in the popup menu


2019.10.16-00:46:02

© Université de Strasbourg/CNRS

    • Contact