Radial profiles of systematic velocities in massive protostellar cores

Pirogov L.; Zemlyanukha P.

doi:doi:10.26119/VAK2024.082

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Radial profiles of systematic velocities in massive protostellar cores

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RADIAL PROFILES OF SYSTEMATIC VELOCITIES IN MASSIVE PROTOSTELLAR CORES

Section: STARS AND THE INTERSTELLAR MEDIUM

Proceedings: MODERN ASTRONOMY: FROM THE EARLY UNIVERSE TO EXOPLANETS AND BLACK HOLES Volume 1

UDC 52 UDC 53 UDC 520 UDC 521 UDC 523 UDC 524 UDC 52-1 UDC 52-6

CSCSTI 41.00 CSCSTI 29.35 CSCSTI 29.31 CSCSTI 29.33 CSCSTI 29.27 CSCSTI 29.05

Russian Classification of Professions by Education 03.06.01 Russian Classification of Professions by Education 03.05.01 Russian Classification of Professions by Education 03.04.03

Russian Library and Bibliographic Classification 2 Russian Library and Bibliographic Classification 223

Russian Trade and Bibliographic Classification 614 Russian Trade and Bibliographic Classification 6135

BISAC SCI004000 Astronomy BISAC SCI005000 Physics / Astrophysics

Pirogov L. ¹

Zemlyanukha P. ²

Author and publication information

Authors:

1. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences
Russian Federation

2. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences

Type:

Сonference article

DOI:

https://doi.org/10.26119/VAK2024.082

EDN:

https://elibrary.ru/degmgo

Published:

27.12.2024

Subject area:

UDC 52
UDC 53
UDC 520
UDC 521
UDC 523
UDC 524
UDC 52-1
UDC 52-6
CSCSTI 41.00
CSCSTI 29.35
CSCSTI 29.31
CSCSTI 29.33
CSCSTI 29.27
CSCSTI 29.05
Russian Classification of Professions by Education 03.06.01
Russian Classification of Professions by Education 03.05.01
Russian Classification of Professions by Education 03.04.03
Russian Library and Bibliographic Classification 2
Russian Library and Bibliographic Classification 223
Russian Trade and Bibliographic Classification 614
Russian Trade and Bibliographic Classification 6135
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics

Language:

English

Keywords:

stars: formation, dense cores; methods: laboratory: molecular, modelling

Abstract and keywords

Abstract (English):
The knowledge of systematic velocity radial profiles in the star-forming cores is important for theoretical models. We analyzed the HCO

^{+}

(1-0) spectral maps of five massive cores from the MALT90 database associated with the regions of high-mass star formation at different stages of evolution. We fitted the maps calculated in the framework of spherically symmetric model into observed ones. An approach based on the principal component analysis and the k-nearest neighbors method was used to find minimum of the error function between model and observed spectral maps. Radial profiles of density, turbulent and systematic velocity are obtained. Densities in the cores decrease with radial distance with power-law indices ranging from 1.5 to 2.5, turbulent velocities decrease with power-law indices ranging from 0.3 to 0.45. Systematic (infall) velocity profiles in the cores are close to

r^{- 0.1}

which differs from what is expected for free fall. Analysis of the

^{13}

CO (2-1) SEDIGISM data for three sample objects has revealed the V-shape features on the position-velocity profiles which implies motions from surrounding gas to the cores. Taken together, the results support the scenario of globally contracting cores which interact with their surroundings.

Keywords:
stars: formation, dense cores; methods: laboratory: molecular, modelling

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References

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