STAR FORMATION RELATIONS IN THE MILKY WAY

ABSTRACT The relations between star formation and properties of molecular clouds (MCs) are studied based on a sample of star-forming regions in the Galactic Plane. Sources were selected by having radio recombination lines to provide identification of associated MCs and dense clumps. Radio continuum...

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Published in:The Astrophysical journal 2016-11, Vol.831 (1), p.73
Main Authors: Vutisalchavakul, Nalin, Evans II, Neal J., Heyer, Mark
Format: Article
Language:English
Subjects:
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CARBON MONOXIDE
Cloud formation
CLOUDS
Clumps
COMPARATIVE EVALUATIONS
Continuum radiation
COSMIC DUST
COSMIC GASES
EFFICIENCY
EMISSION
GALAXIES
galaxies: star formation
Infrared emissions
MASS
MILKY WAY
Molecular clouds
Molecular gases
MOLECULES
RECOMBINATION
regions
Star & galaxy formation
STAR EVOLUTION
Star formation
STARS
Stars & galaxies
stars: formation
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creator Vutisalchavakul, Nalin
Evans II, Neal J.
Heyer, Mark
description ABSTRACT The relations between star formation and properties of molecular clouds (MCs) are studied based on a sample of star-forming regions in the Galactic Plane. Sources were selected by having radio recombination lines to provide identification of associated MCs and dense clumps. Radio continuum emission and mid-infrared emission were used to determine star formation rates (SFRs), while 13CO and submillimeter dust continuum emission were used to obtain the masses of molecular and dense gas, respectively. We test whether total molecular gas or dense gas provides the best predictor of SFR. We also test two specific theoretical models, one relying on the molecular mass divided by the free-fall time, the other using the free-fall time divided by the crossing time. Neither is supported by the data. The data are also compared to those from nearby star-forming regions and extragalactic data. The star formation "efficiency," defined as SFR divided by mass, spreads over a large range when the mass refers to molecular gas; the standard deviation of the log of the efficiency decreases by a factor of three when the mass of relatively dense molecular gas is used rather than the mass of all of the molecular gas.
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subjects Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CARBON MONOXIDE
Cloud formation
CLOUDS
Clumps
COMPARATIVE EVALUATIONS
Continuum radiation
COSMIC DUST
COSMIC GASES
EFFICIENCY
EMISSION
GALAXIES
galaxies: star formation
Infrared emissions
MASS
MILKY WAY
Molecular clouds
Molecular gases
MOLECULES
RECOMBINATION
regions
Star & galaxy formation
STAR EVOLUTION
Star formation
STARS
Stars & galaxies
stars: formation
title STAR FORMATION RELATIONS IN THE MILKY WAY
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