Tracing the mass during low-mass star formation. II. Modeling the submillimeter emission from preprotostellar cores

Neal J. Evans, Jonathan M C Rawlings, Yancy L Shirley, Lee G. Mundy

Research output: Contribution to journalArticle

268 Citations (Scopus)

Abstract

We have modeled the emission from dust in preprotostellar cores, including a self-consistent calculation of the temperature distribution for each input density distribution. Model density distributions include Bonnor-Ebert spheres and power laws. The Bonnor-Ebert spheres fit the data well for all three cores that we have modeled. The dust temperatures decline to very low values (Td ∼ 7 K) in the centers of these cores, strongly affecting the dust emission. Compared to earlier models that assume constant dust temperatures, our models indicate higher central densities and smaller regions of relatively constant density. Indeed, for L1544, a power-law density distribution, similar to that of a singular, isothermal sphere, cannot be ruled out. For the three sources modeled herein, there seems to be a sequence of increasing central condensation, from L1512 to L1689B to L1544. The two denser cores, L1689B and L1544, have spectroscopic evidence for contraction, suggesting an evolutionary sequence for preprotostellar cores.

Original languageEnglish (US)
Pages (from-to)193-208
Number of pages16
JournalAstrophysical Journal
Volume557
Issue number1 PART 1
DOIs
StatePublished - Aug 10 2001
Externally publishedYes

Fingerprint

tracing
star formation
dust
density distribution
modeling
power law
temperature
contraction
condensation
temperature distribution
distribution

Keywords

  • Dust, extinction
  • ISM: clouds
  • ISM: individual (L1512, L1544, L1689B)
  • Stars: formation

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Tracing the mass during low-mass star formation. II. Modeling the submillimeter emission from preprotostellar cores. / Evans, Neal J.; Rawlings, Jonathan M C; Shirley, Yancy L; Mundy, Lee G.

In: Astrophysical Journal, Vol. 557, No. 1 PART 1, 10.08.2001, p. 193-208.

Research output: Contribution to journalArticle

Evans, Neal J. ; Rawlings, Jonathan M C ; Shirley, Yancy L ; Mundy, Lee G. / Tracing the mass during low-mass star formation. II. Modeling the submillimeter emission from preprotostellar cores. In: Astrophysical Journal. 2001 ; Vol. 557, No. 1 PART 1. pp. 193-208.
@article{79bf0dfb19244ab4bdf078e4502d727a,
title = "Tracing the mass during low-mass star formation. II. Modeling the submillimeter emission from preprotostellar cores",
abstract = "We have modeled the emission from dust in preprotostellar cores, including a self-consistent calculation of the temperature distribution for each input density distribution. Model density distributions include Bonnor-Ebert spheres and power laws. The Bonnor-Ebert spheres fit the data well for all three cores that we have modeled. The dust temperatures decline to very low values (Td ∼ 7 K) in the centers of these cores, strongly affecting the dust emission. Compared to earlier models that assume constant dust temperatures, our models indicate higher central densities and smaller regions of relatively constant density. Indeed, for L1544, a power-law density distribution, similar to that of a singular, isothermal sphere, cannot be ruled out. For the three sources modeled herein, there seems to be a sequence of increasing central condensation, from L1512 to L1689B to L1544. The two denser cores, L1689B and L1544, have spectroscopic evidence for contraction, suggesting an evolutionary sequence for preprotostellar cores.",
keywords = "Dust, extinction, ISM: clouds, ISM: individual (L1512, L1544, L1689B), Stars: formation",
author = "Evans, {Neal J.} and Rawlings, {Jonathan M C} and Shirley, {Yancy L} and Mundy, {Lee G.}",
year = "2001",
month = "8",
day = "10",
doi = "10.1086/321639",
language = "English (US)",
volume = "557",
pages = "193--208",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1 PART 1",

}

TY - JOUR

T1 - Tracing the mass during low-mass star formation. II. Modeling the submillimeter emission from preprotostellar cores

AU - Evans, Neal J.

AU - Rawlings, Jonathan M C

AU - Shirley, Yancy L

AU - Mundy, Lee G.

PY - 2001/8/10

Y1 - 2001/8/10

N2 - We have modeled the emission from dust in preprotostellar cores, including a self-consistent calculation of the temperature distribution for each input density distribution. Model density distributions include Bonnor-Ebert spheres and power laws. The Bonnor-Ebert spheres fit the data well for all three cores that we have modeled. The dust temperatures decline to very low values (Td ∼ 7 K) in the centers of these cores, strongly affecting the dust emission. Compared to earlier models that assume constant dust temperatures, our models indicate higher central densities and smaller regions of relatively constant density. Indeed, for L1544, a power-law density distribution, similar to that of a singular, isothermal sphere, cannot be ruled out. For the three sources modeled herein, there seems to be a sequence of increasing central condensation, from L1512 to L1689B to L1544. The two denser cores, L1689B and L1544, have spectroscopic evidence for contraction, suggesting an evolutionary sequence for preprotostellar cores.

AB - We have modeled the emission from dust in preprotostellar cores, including a self-consistent calculation of the temperature distribution for each input density distribution. Model density distributions include Bonnor-Ebert spheres and power laws. The Bonnor-Ebert spheres fit the data well for all three cores that we have modeled. The dust temperatures decline to very low values (Td ∼ 7 K) in the centers of these cores, strongly affecting the dust emission. Compared to earlier models that assume constant dust temperatures, our models indicate higher central densities and smaller regions of relatively constant density. Indeed, for L1544, a power-law density distribution, similar to that of a singular, isothermal sphere, cannot be ruled out. For the three sources modeled herein, there seems to be a sequence of increasing central condensation, from L1512 to L1689B to L1544. The two denser cores, L1689B and L1544, have spectroscopic evidence for contraction, suggesting an evolutionary sequence for preprotostellar cores.

KW - Dust, extinction

KW - ISM: clouds

KW - ISM: individual (L1512, L1544, L1689B)

KW - Stars: formation

UR - http://www.scopus.com/inward/record.url?scp=0035839387&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035839387&partnerID=8YFLogxK

U2 - 10.1086/321639

DO - 10.1086/321639

M3 - Article

VL - 557

SP - 193

EP - 208

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 PART 1

ER -