KMOS3D

dynamical constraints on the mass budget in early star-forming disks

Stijn Wuyts, Natascha M. Förster Schreiber, Emily Wisnioski, Reinhard Genzel, Andreas Burkert, Kaushala Bandara, Alessandra Beifiori, Sirio Belli, Ralf Bender, Gabriel B. Brammer, Jeffrey Chan, Ric Davies, Matteo Fossati, Audrey Galametz, Sandesh K. Kulkarni, Philipp Lang, Dieter Lutz, J. Trevor Mendel, Ivelina G. Momcheva, Thorsten Naab & 9 others Erica J. Nelson, Roberto P. Saglia, Stella Seitz, Linda J. Tacconi, Ken Ichi Tadaki, Hannah Übler, Pieter G Van Dokkum, David J. Wilman, Eva Wuyts

Research output: Contribution to journalArticle

35 Citations (Scopus)
76 Downloads (Pure)

Abstract

We exploit deep integral-field spectroscopic observations with KMOS/Very Large Telescope of 240 star-forming disks at 0.6 <z <2.6 to dynamically constrain their mass budget. Our sample consists of massive (≳109.8M) galaxies with sizes Re ≳ 2kpc. By contrasting the observed velocity and dispersion profiles with dynamical models, we find that on average the stellar content contributes 32-7 +8% of the total dynamical mass, with a significant spread among galaxies (68th percentile range fstar ∼ 18%-62%). Including molecular gas as inferred from CO- and dust-based scaling relations, the estimated baryonic mass adds up to 56-12 +17% of the total for the typical galaxy in our sample, reaching ∼90% at z > 2. We conclude that baryons make up most of the mass within the disk regions of high-redshift star-forming disk galaxies, with typical disks at z > 2 being strongly baryon-dominated within R e. Substantial object-to-object variations in both stellar and baryonic mass fractions are observed among the galaxies in our sample, larger than what can be accounted for by the formal uncertainties in their respective measurements. In both cases, the mass fractions correlate most strongly with measures of surface density. High-Σstar galaxies feature stellar mass fractions closer to unity, and systems with high inferred gas or baryonic surface densities leave less room for additional mass components other than stars and molecular gas. Our findings can be interpreted as more extended disks probing further (and more compact disks probing less far) into the dark matter halos that host them.

Original languageEnglish
Article number149
JournalAstrophysical Journal
Volume831
Issue number2
DOIs
Publication statusPublished - 3 Nov 2016

Fingerprint

early stars
budgets
galaxies
stars
molecular gases
stellar mass
baryons
gas
disk galaxies
budget
gases
rooms
unity
halos
dark matter
velocity distribution
dust
telescopes
scaling
profiles

Keywords

  • galaxies: evolution
  • galaxies: high-redshift
  • galaxies: kinematics and dynamics

Cite this

Wuyts, S., Schreiber, N. M. F., Wisnioski, E., Genzel, R., Burkert, A., Bandara, K., ... Wuyts, E. (2016). KMOS3D: dynamical constraints on the mass budget in early star-forming disks. Astrophysical Journal, 831(2), [149]. https://doi.org/10.3847/0004-637X/831/2/149

KMOS3D : dynamical constraints on the mass budget in early star-forming disks. / Wuyts, Stijn; Schreiber, Natascha M. Förster; Wisnioski, Emily; Genzel, Reinhard; Burkert, Andreas; Bandara, Kaushala; Beifiori, Alessandra; Belli, Sirio; Bender, Ralf; Brammer, Gabriel B.; Chan, Jeffrey; Davies, Ric; Fossati, Matteo; Galametz, Audrey; Kulkarni, Sandesh K.; Lang, Philipp; Lutz, Dieter; Mendel, J. Trevor; Momcheva, Ivelina G.; Naab, Thorsten; Nelson, Erica J.; Saglia, Roberto P.; Seitz, Stella; Tacconi, Linda J.; Tadaki, Ken Ichi; Übler, Hannah; Dokkum, Pieter G Van; Wilman, David J.; Wuyts, Eva.

In: Astrophysical Journal, Vol. 831, No. 2, 149, 03.11.2016.

Research output: Contribution to journalArticle

Wuyts, S, Schreiber, NMF, Wisnioski, E, Genzel, R, Burkert, A, Bandara, K, Beifiori, A, Belli, S, Bender, R, Brammer, GB, Chan, J, Davies, R, Fossati, M, Galametz, A, Kulkarni, SK, Lang, P, Lutz, D, Mendel, JT, Momcheva, IG, Naab, T, Nelson, EJ, Saglia, RP, Seitz, S, Tacconi, LJ, Tadaki, KI, Übler, H, Dokkum, PGV, Wilman, DJ & Wuyts, E 2016, 'KMOS3D: dynamical constraints on the mass budget in early star-forming disks', Astrophysical Journal, vol. 831, no. 2, 149. https://doi.org/10.3847/0004-637X/831/2/149
Wuyts, Stijn ; Schreiber, Natascha M. Förster ; Wisnioski, Emily ; Genzel, Reinhard ; Burkert, Andreas ; Bandara, Kaushala ; Beifiori, Alessandra ; Belli, Sirio ; Bender, Ralf ; Brammer, Gabriel B. ; Chan, Jeffrey ; Davies, Ric ; Fossati, Matteo ; Galametz, Audrey ; Kulkarni, Sandesh K. ; Lang, Philipp ; Lutz, Dieter ; Mendel, J. Trevor ; Momcheva, Ivelina G. ; Naab, Thorsten ; Nelson, Erica J. ; Saglia, Roberto P. ; Seitz, Stella ; Tacconi, Linda J. ; Tadaki, Ken Ichi ; Übler, Hannah ; Dokkum, Pieter G Van ; Wilman, David J. ; Wuyts, Eva. / KMOS3D : dynamical constraints on the mass budget in early star-forming disks. In: Astrophysical Journal. 2016 ; Vol. 831, No. 2.
@article{ec6ac8a55cee47198d21a1ecd09208d1,
title = "KMOS3D: dynamical constraints on the mass budget in early star-forming disks",
abstract = "We exploit deep integral-field spectroscopic observations with KMOS/Very Large Telescope of 240 star-forming disks at 0.6 9.8M⊙) galaxies with sizes Re ≳ 2kpc. By contrasting the observed velocity and dispersion profiles with dynamical models, we find that on average the stellar content contributes 32-7 +8{\%} of the total dynamical mass, with a significant spread among galaxies (68th percentile range fstar ∼ 18{\%}-62{\%}). Including molecular gas as inferred from CO- and dust-based scaling relations, the estimated baryonic mass adds up to 56-12 +17{\%} of the total for the typical galaxy in our sample, reaching ∼90{\%} at z > 2. We conclude that baryons make up most of the mass within the disk regions of high-redshift star-forming disk galaxies, with typical disks at z > 2 being strongly baryon-dominated within R e. Substantial object-to-object variations in both stellar and baryonic mass fractions are observed among the galaxies in our sample, larger than what can be accounted for by the formal uncertainties in their respective measurements. In both cases, the mass fractions correlate most strongly with measures of surface density. High-Σstar galaxies feature stellar mass fractions closer to unity, and systems with high inferred gas or baryonic surface densities leave less room for additional mass components other than stars and molecular gas. Our findings can be interpreted as more extended disks probing further (and more compact disks probing less far) into the dark matter halos that host them.",
keywords = "galaxies: evolution, galaxies: high-redshift, galaxies: kinematics and dynamics",
author = "Stijn Wuyts and Schreiber, {Natascha M. F{\"o}rster} and Emily Wisnioski and Reinhard Genzel and Andreas Burkert and Kaushala Bandara and Alessandra Beifiori and Sirio Belli and Ralf Bender and Brammer, {Gabriel B.} and Jeffrey Chan and Ric Davies and Matteo Fossati and Audrey Galametz and Kulkarni, {Sandesh K.} and Philipp Lang and Dieter Lutz and Mendel, {J. Trevor} and Momcheva, {Ivelina G.} and Thorsten Naab and Nelson, {Erica J.} and Saglia, {Roberto P.} and Stella Seitz and Tacconi, {Linda J.} and Tadaki, {Ken Ichi} and Hannah {\"U}bler and Dokkum, {Pieter G Van} and Wilman, {David J.} and Eva Wuyts",
year = "2016",
month = "11",
day = "3",
doi = "10.3847/0004-637X/831/2/149",
language = "English",
volume = "831",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing",
number = "2",

}

TY - JOUR

T1 - KMOS3D

T2 - dynamical constraints on the mass budget in early star-forming disks

AU - Wuyts, Stijn

AU - Schreiber, Natascha M. Förster

AU - Wisnioski, Emily

AU - Genzel, Reinhard

AU - Burkert, Andreas

AU - Bandara, Kaushala

AU - Beifiori, Alessandra

AU - Belli, Sirio

AU - Bender, Ralf

AU - Brammer, Gabriel B.

AU - Chan, Jeffrey

AU - Davies, Ric

AU - Fossati, Matteo

AU - Galametz, Audrey

AU - Kulkarni, Sandesh K.

AU - Lang, Philipp

AU - Lutz, Dieter

AU - Mendel, J. Trevor

AU - Momcheva, Ivelina G.

AU - Naab, Thorsten

AU - Nelson, Erica J.

AU - Saglia, Roberto P.

AU - Seitz, Stella

AU - Tacconi, Linda J.

AU - Tadaki, Ken Ichi

AU - Übler, Hannah

AU - Dokkum, Pieter G Van

AU - Wilman, David J.

AU - Wuyts, Eva

PY - 2016/11/3

Y1 - 2016/11/3

N2 - We exploit deep integral-field spectroscopic observations with KMOS/Very Large Telescope of 240 star-forming disks at 0.6 9.8M⊙) galaxies with sizes Re ≳ 2kpc. By contrasting the observed velocity and dispersion profiles with dynamical models, we find that on average the stellar content contributes 32-7 +8% of the total dynamical mass, with a significant spread among galaxies (68th percentile range fstar ∼ 18%-62%). Including molecular gas as inferred from CO- and dust-based scaling relations, the estimated baryonic mass adds up to 56-12 +17% of the total for the typical galaxy in our sample, reaching ∼90% at z > 2. We conclude that baryons make up most of the mass within the disk regions of high-redshift star-forming disk galaxies, with typical disks at z > 2 being strongly baryon-dominated within R e. Substantial object-to-object variations in both stellar and baryonic mass fractions are observed among the galaxies in our sample, larger than what can be accounted for by the formal uncertainties in their respective measurements. In both cases, the mass fractions correlate most strongly with measures of surface density. High-Σstar galaxies feature stellar mass fractions closer to unity, and systems with high inferred gas or baryonic surface densities leave less room for additional mass components other than stars and molecular gas. Our findings can be interpreted as more extended disks probing further (and more compact disks probing less far) into the dark matter halos that host them.

AB - We exploit deep integral-field spectroscopic observations with KMOS/Very Large Telescope of 240 star-forming disks at 0.6 9.8M⊙) galaxies with sizes Re ≳ 2kpc. By contrasting the observed velocity and dispersion profiles with dynamical models, we find that on average the stellar content contributes 32-7 +8% of the total dynamical mass, with a significant spread among galaxies (68th percentile range fstar ∼ 18%-62%). Including molecular gas as inferred from CO- and dust-based scaling relations, the estimated baryonic mass adds up to 56-12 +17% of the total for the typical galaxy in our sample, reaching ∼90% at z > 2. We conclude that baryons make up most of the mass within the disk regions of high-redshift star-forming disk galaxies, with typical disks at z > 2 being strongly baryon-dominated within R e. Substantial object-to-object variations in both stellar and baryonic mass fractions are observed among the galaxies in our sample, larger than what can be accounted for by the formal uncertainties in their respective measurements. In both cases, the mass fractions correlate most strongly with measures of surface density. High-Σstar galaxies feature stellar mass fractions closer to unity, and systems with high inferred gas or baryonic surface densities leave less room for additional mass components other than stars and molecular gas. Our findings can be interpreted as more extended disks probing further (and more compact disks probing less far) into the dark matter halos that host them.

KW - galaxies: evolution

KW - galaxies: high-redshift

KW - galaxies: kinematics and dynamics

UR - http://www.scopus.com/inward/record.url?scp=84994528997&partnerID=8YFLogxK

UR - http://dx.doi.org/10.3847/0004-637X/831/2/149

U2 - 10.3847/0004-637X/831/2/149

DO - 10.3847/0004-637X/831/2/149

M3 - Article

VL - 831

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 149

ER -