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 to dynamically constrain their mass budget. Our sample consists of massive ( ) galaxies with sizes . By contrasting the observed velocity and dispersion profiles with dynami...

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Bibliographic Details
Published in:	The Astrophysical journal 2016-11, Vol.831 (2), p.149
Main Authors:	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
Format:	Article
Language:	eng
Subjects:	Accretion disks Astronomical models ASTROPHYSICS, COSMOLOGY AND ASTRONOMY BARYONS Budgets CARBON MONOXIDE Correlation analysis COSMIC DUST Dark matter DENSITY Disk galaxies DISPERSIONS Early stars GALACTIC EVOLUTION Galactic halos GALAXIES Halos MASS Mass budget Molecular gases NONLUMINOUS MATTER RED SHIFT Star formation STARS Stellar mass TELESCOPES Very Large Telescope
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Summary:	ABSTRACT We exploit deep integral-field spectroscopic observations with KMOS/Very Large Telescope of 240 star-forming disks at to dynamically constrain their mass budget. Our sample consists of massive ( ) galaxies with sizes . By contrasting the observed velocity and dispersion profiles with dynamical models, we find that on average the stellar content contributes of the total dynamical mass, with a significant spread among galaxies (68th percentile range ). Including molecular gas as inferred from CO- and dust-based scaling relations, the estimated baryonic mass adds up to of the total for the typical galaxy in our sample, reaching at . 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 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- 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.
ISSN:	0004-637X 1538-4357