Universität zu Köln

Veltchev, Todor V., Girichidis, Philipp, Donkov, Sava, Schneider, Nicola ORCID: 0000-0003-3485-6678, Stanchev, Orlin, Marinkova, Lyubov, Seifried, Daniel ORCID: 0000-0002-0368-9160 and Klessen, Ralf S. (2019). On the extraction of the power-law parts of probability density functions in star-forming clouds. Mon. Not. Roy. Astron. Soc., 489 (1). S. 788 - 802. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We present a new approach to extract the power-law part of a density/column-density probability density function (.-pdf/N-pdf) in star-forming clouds. This approach is based on the mathematical method BPLFIT of Virkar & Clauset (2014, Annals of Applied Statistics, 8, 89) and it assesses the power-law part of an arbitrary distribution, without any assumptions about the other parts of this distribution. The slope and deviation point are derived as averaged values as the number of bins is varied. Neither parameter is sensitive to spikes and other local features of the tail. This adapted BPLFIT method is applied to two different sets of data from numerical simulations of star-forming clouds at scales 0.5 and 500 pc, and it displays.-pdf and N-pdf evolution in agreement with a number of numerical and theoretical studies. Applied to Herschel data on the regions Aquila and Rosette, the method extracts pronounced power-law tails, consistent with those seen in simulations of evolved clouds.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Veltchev, Todor V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Girichidis, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Donkov, Sava UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, Nicola UNSPECIFIED orcid.org/0000-0003-3485-6678 UNSPECIFIED Stanchev, Orlin UNSPECIFIED UNSPECIFIED UNSPECIFIED Marinkova, Lyubov UNSPECIFIED UNSPECIFIED UNSPECIFIED Seifried, Daniel UNSPECIFIED orcid.org/0000-0002-0368-9160 UNSPECIFIED Klessen, Ralf S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-132639
DOI:	10.1093/mnras/stz2151
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	489
Number:	1
Page Range:	S. 788 - 802
Date:	2019
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MOLECULAR CLOUDS; SUPERSONIC TURBULENCE; MAGNETIC-FIELDS; EVOLUTION; STELLAR; FLASH; I.; DISTRIBUTIONS; PROJECT; TAILS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13263