Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Veltchev, Todor"'
Autor:
Veltchev, Todor V., Girichidis, Philipp, Marinkova, Lyubov, Donkov, Sava, Stanchev, Orlin, Klessen, Ralf S.
We present a numerical study of the evolution of power-law tails (PLTs) in the (column-)density distributions ($N$-PDF, $\rho$-PDF) in contracting star-forming clumps in primordial gas, without and with some initial rotational and/or turbulent suppor
Externí odkaz:
http://arxiv.org/abs/2401.02148
Publikováno v:
Bulgarian Astronomical Journal, 2023, vol 38, p. 91
The presented paper is an attempt to investigate the dynamical states of an hydrodynamical isothermal turbulent self-gravitating system using some powerful tools of the classical thermodynamics. Our main assumption, inspired by the work of Keto et al
Externí odkaz:
http://arxiv.org/abs/2311.11729
Autor:
Veltchev, Todor V., Girichidis, Philipp, Donkov, Sava, Schneider, Nicola, Stanchev, Orlin, Marinkova, Lyubov, Seifried, Daniel, Klessen, Ralf S.
We present a new approach to extract the power-law part of a density/column-density probability density function (rho-pdf/N-pdf) in star-forming clouds. It is based on the mathematical method bPLFIT of Virkar & Clauset (2014) and assesses the power-l
Externí odkaz:
http://arxiv.org/abs/1908.00489
Autor:
Veltchev, Todor V., Ossenkopf-Okada, Volker, Stanchev, Orlin, Schneider, Nicola, Donkov, Sava, Klessen, Ralf S.
Spatial association of clumps from different tracers turns out to be a valuable tool to determine the physical properties of molecular clouds. It provides a reliable estimate for the $X$-factors, serves to trace the density of clumps seen in column d
Externí odkaz:
http://arxiv.org/abs/1712.05118
We present a method to derive the density scaling relation $\langle n\rangle \propto L^{-\alpha}$ in regions of star formation or in their turbulent vicinities from straightforward binning of the column-density distribution ($N$-pdf). The outcome of
Externí odkaz:
http://arxiv.org/abs/1705.06550
We introduce the concept of a class of equivalence of molecular clouds represented by an abstract spherically symmetric, isotropic object. This object is described by use of abstract scales in respect to a given mass density distribution. Mass and av
Externí odkaz:
http://arxiv.org/abs/1612.00340
We present a model for describing the general structure of molecular clouds (MCs) at early evolutionary stages in terms of their mass-size relationship. Sizes are defined through threshold levels at which equipartitions between gravitational, turbule
Externí odkaz:
http://arxiv.org/abs/1603.08441
Autor:
Stanchev, Orlin, Veltchev, Todor V., Kauffmann, Jens, Donkov, Sava, Shetty, Rahul, Körtgen, Bastian, Klessen, Ralf S.
We present an analysis of probability distribution functions (pdfs) of column density in different zones of the star-forming region Perseus and its diffuse environment based on the map of dust opacity at 353 GHz available from the Planck archive. The
Externí odkaz:
http://arxiv.org/abs/1505.01622
Volume and column density PDFs in molecular clouds are important diagnostics for understanding their general structure. We developed a novel approach to trace the cloud structure by varying the lower PDF cut-off and exploring a suggested mass-density
Externí odkaz:
http://arxiv.org/abs/1308.0261