THE SYSTEMATIC PROPERTIES of the WARM PHASE of STARBURST-DRIVEN GALACTIC WINDS

Timothy M. Heckman, Rachel M. Alexandroff, Sanchayeeta Borthakur, Roderik Overzier, Claus Leitherer

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

Using ultraviolet absorption lines, we analyze the systematic properties of the warm ionized phase of starburst-driven winds in a sample of 39 low-redshift objects that spans broad ranges in starburst and galaxy properties. Total column densities for the outflows are ∼1021 cm-2. The outflow velocity (vout) correlates only weakly with the galaxy stellar mass (), or circular velocity (vcir), but strongly with both SFR and SFR/area. The normalized outflow velocity () correlates well with both SFR/area and SFR/. The estimated outflow rates of warm ionized gas () are ∼1-4 times the SFR, and the ratio does not correlate with vout. We show that a model of a population of clouds accelerated by the combined forces of gravity and the momentum flux from the starburst matches the data. We find a threshold value for the ratio of the momentum flux supplied by the starburst to the critical momentum flux needed for the wind to overcome gravity acting on the clouds (Rcrit). For 10 (strong-outflows) the outflow's momentum flux is similar to the total momentum flux from the starburst and the outflow velocity exceeds the galaxy escape velocity. Neither of these is the case for the weak outflows ( 10). For the weak-outflows, the data severely disagree with many prescriptions in numerical simulations or semi-analytic models of galaxy evolution. The agreement is better for the strong outflows, and we advocate the use of Rcrit to guide future prescriptions.

Original languageEnglish (US)
Article number147
JournalAstrophysical Journal
Volume809
Issue number2
DOIs
StatePublished - Aug 20 2015
Externally publishedYes

Fingerprint

galactic winds
outflow
momentum
galaxies
gravitation
escape velocity
ultraviolet absorption
ionized gases
stellar mass
gravity
thresholds
simulation

Keywords

  • galaxies: evolution
  • galaxies: ISM
  • galaxies: kinematics and dynamics
  • galaxies: starburst
  • intergalactic medium

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

THE SYSTEMATIC PROPERTIES of the WARM PHASE of STARBURST-DRIVEN GALACTIC WINDS. / Heckman, Timothy M.; Alexandroff, Rachel M.; Borthakur, Sanchayeeta; Overzier, Roderik; Leitherer, Claus.

In: Astrophysical Journal, Vol. 809, No. 2, 147, 20.08.2015.

Research output: Contribution to journalArticle

Heckman, Timothy M. ; Alexandroff, Rachel M. ; Borthakur, Sanchayeeta ; Overzier, Roderik ; Leitherer, Claus. / THE SYSTEMATIC PROPERTIES of the WARM PHASE of STARBURST-DRIVEN GALACTIC WINDS. In: Astrophysical Journal. 2015 ; Vol. 809, No. 2.
@article{ad1156e265a748afad892b57f5a852b9,
title = "THE SYSTEMATIC PROPERTIES of the WARM PHASE of STARBURST-DRIVEN GALACTIC WINDS",
abstract = "Using ultraviolet absorption lines, we analyze the systematic properties of the warm ionized phase of starburst-driven winds in a sample of 39 low-redshift objects that spans broad ranges in starburst and galaxy properties. Total column densities for the outflows are ∼1021 cm-2. The outflow velocity (vout) correlates only weakly with the galaxy stellar mass (), or circular velocity (vcir), but strongly with both SFR and SFR/area. The normalized outflow velocity () correlates well with both SFR/area and SFR/. The estimated outflow rates of warm ionized gas () are ∼1-4 times the SFR, and the ratio does not correlate with vout. We show that a model of a population of clouds accelerated by the combined forces of gravity and the momentum flux from the starburst matches the data. We find a threshold value for the ratio of the momentum flux supplied by the starburst to the critical momentum flux needed for the wind to overcome gravity acting on the clouds (Rcrit). For 10 (strong-outflows) the outflow's momentum flux is similar to the total momentum flux from the starburst and the outflow velocity exceeds the galaxy escape velocity. Neither of these is the case for the weak outflows ( 10). For the weak-outflows, the data severely disagree with many prescriptions in numerical simulations or semi-analytic models of galaxy evolution. The agreement is better for the strong outflows, and we advocate the use of Rcrit to guide future prescriptions.",
keywords = "galaxies: evolution, galaxies: ISM, galaxies: kinematics and dynamics, galaxies: starburst, intergalactic medium",
author = "Heckman, {Timothy M.} and Alexandroff, {Rachel M.} and Sanchayeeta Borthakur and Roderik Overzier and Claus Leitherer",
year = "2015",
month = "8",
day = "20",
doi = "10.1088/0004-637X/809/2/147",
language = "English (US)",
volume = "809",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - THE SYSTEMATIC PROPERTIES of the WARM PHASE of STARBURST-DRIVEN GALACTIC WINDS

AU - Heckman, Timothy M.

AU - Alexandroff, Rachel M.

AU - Borthakur, Sanchayeeta

AU - Overzier, Roderik

AU - Leitherer, Claus

PY - 2015/8/20

Y1 - 2015/8/20

N2 - Using ultraviolet absorption lines, we analyze the systematic properties of the warm ionized phase of starburst-driven winds in a sample of 39 low-redshift objects that spans broad ranges in starburst and galaxy properties. Total column densities for the outflows are ∼1021 cm-2. The outflow velocity (vout) correlates only weakly with the galaxy stellar mass (), or circular velocity (vcir), but strongly with both SFR and SFR/area. The normalized outflow velocity () correlates well with both SFR/area and SFR/. The estimated outflow rates of warm ionized gas () are ∼1-4 times the SFR, and the ratio does not correlate with vout. We show that a model of a population of clouds accelerated by the combined forces of gravity and the momentum flux from the starburst matches the data. We find a threshold value for the ratio of the momentum flux supplied by the starburst to the critical momentum flux needed for the wind to overcome gravity acting on the clouds (Rcrit). For 10 (strong-outflows) the outflow's momentum flux is similar to the total momentum flux from the starburst and the outflow velocity exceeds the galaxy escape velocity. Neither of these is the case for the weak outflows ( 10). For the weak-outflows, the data severely disagree with many prescriptions in numerical simulations or semi-analytic models of galaxy evolution. The agreement is better for the strong outflows, and we advocate the use of Rcrit to guide future prescriptions.

AB - Using ultraviolet absorption lines, we analyze the systematic properties of the warm ionized phase of starburst-driven winds in a sample of 39 low-redshift objects that spans broad ranges in starburst and galaxy properties. Total column densities for the outflows are ∼1021 cm-2. The outflow velocity (vout) correlates only weakly with the galaxy stellar mass (), or circular velocity (vcir), but strongly with both SFR and SFR/area. The normalized outflow velocity () correlates well with both SFR/area and SFR/. The estimated outflow rates of warm ionized gas () are ∼1-4 times the SFR, and the ratio does not correlate with vout. We show that a model of a population of clouds accelerated by the combined forces of gravity and the momentum flux from the starburst matches the data. We find a threshold value for the ratio of the momentum flux supplied by the starburst to the critical momentum flux needed for the wind to overcome gravity acting on the clouds (Rcrit). For 10 (strong-outflows) the outflow's momentum flux is similar to the total momentum flux from the starburst and the outflow velocity exceeds the galaxy escape velocity. Neither of these is the case for the weak outflows ( 10). For the weak-outflows, the data severely disagree with many prescriptions in numerical simulations or semi-analytic models of galaxy evolution. The agreement is better for the strong outflows, and we advocate the use of Rcrit to guide future prescriptions.

KW - galaxies: evolution

KW - galaxies: ISM

KW - galaxies: kinematics and dynamics

KW - galaxies: starburst

KW - intergalactic medium

UR - http://www.scopus.com/inward/record.url?scp=84939856436&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84939856436&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/809/2/147

DO - 10.1088/0004-637X/809/2/147

M3 - Article

AN - SCOPUS:84939856436

VL - 809

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 147

ER -