SUPERNOVA DRIVING. III. SYNTHETIC MOLECULAR CLOUD OBSERVATIONS

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Padoan , P , Juvela , M , Pan , L , Haugbolle , T & Nordlund , Å 2016 , ' SUPERNOVA DRIVING. III. SYNTHETIC MOLECULAR CLOUD OBSERVATIONS ' Astrophysical Journal , vol. 826 , no. 2 , 140 . DOI: 10.3847/0004-637X/826/2/140

Title: SUPERNOVA DRIVING. III. SYNTHETIC MOLECULAR CLOUD OBSERVATIONS
Author: Padoan, Paolo; Juvela, Mika; Pan, Liubin; Haugbolle, Troels; Nordlund, Åke
Contributor: University of Helsinki, Department of Physics
Date: 2016-08-01
Language: eng
Number of pages: 10
Belongs to series: Astrophysical Journal
ISSN: 0004-637X
URI: http://hdl.handle.net/10138/183624
Abstract: We present a comparison of molecular clouds (MCs) from a simulation of supernova (SN) driven interstellar medium (ISM) turbulence with real MCs from the Outer Galaxy Survey. The radiative transfer calculations to compute synthetic CO spectra are carried out assuming that the CO relative abundance depends only on gas density, according to four different models. Synthetic MCs are selected above a threshold brightness temperature value, T-B,T-min = 1.4 K, of the J = 1 - 0 (CO)-C-12 line, generating 16 synthetic catalogs (four different spatial resolutions and four CO abundance models), each containing up to several thousands MCs. The comparison with the observations focuses on the mass and size distributions and on the velocity-size and mass-size Larson relations. The mass and size distributions are found to be consistent with the observations, with no significant variations with spatial resolution or chemical model, except in the case of the unrealistic model with constant CO abundance. The velocity-size relation is slightly too steep for some of the models, while the mass-size relation is a bit too shallow for all models only at a spatial resolution dx approximate to 1 pc. The normalizations of the Larson relations show a clear dependence on spatial resolution, for both the synthetic and the real MCs. The comparison of the velocity-size normalization suggests that the SN rate in the Perseus arm is approximately 70% or less of the rate adopted in the simulation. Overall, the realistic properties of the synthetic clouds confirm that SN-driven turbulence can explain the origin and dynamics of MCs.
Subject: ISM: kinematics and dynamics
magnetohydrodynamics (MHD)
stars: formation
turbulence
INITIAL MASS FUNCTION
STAR-FORMATION RATE
SUPERSONIC ISOTHERMAL TURBULENCE
INTERSTELLAR CLOUDS
RADIATIVE-TRANSFER
OUTER GALAXY
SIMULATIONS
FRAGMENTATION
STATISTICS
FEEDBACK
115 Astronomy, Space science
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