J/ApJ/892/1 Sizes of galaxies from the KMOS3D survey (Wilman+, 2020)
The regulation of galaxy growth along the size-mass relation by star formation,
as traced by Hα in KMOS3D galaxies at 0.7≲z≲2.7.
Wilman D.J., Fossati M., Mendel J.T., Saglia R., Wisnioski E., Wuyts S.,
Forster Schreiber N., Beifiori A., Bender R., Belli S., Ubler H., Lang P.,
Chan J.C.C., Davies R.L., Nelson E.J., Genzel R., Tacconi L.J.,
Galametz A., Davies R.I., Lutz D., Price S., Burkert A., Tadaki K.-I.,
Herrera-Camus R., Brammer G., Momcheva I., Van Dokkum P.
<Astrophys. J., 892, 1-1 (2020)>
=2020ApJ...892....1W 2020ApJ...892....1W (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra; Infrared; Redshifts
Keywords: Galaxy evolution; Galaxy structure; Galaxy disks; Star formation
Spectroscopy
Abstract:
We present half-light sizes measured from Hα emission tracing
star formation in 281 star-forming galaxies from the KMOS3D survey
at 0.7≲z≲2.7. Sizes are derived by fitting 2D exponential disk
models, with bootstrap errors averaging 20%. Hα sizes are a
median (mean) of 1.19 (1.26) times larger than those of the stellar
continuum-which, due to radial dust gradients, places an upper limit
on the growth in stellar size via star formation-with just ∼43%
intrinsic scatter. At fixed continuum size the Hα size shows no
residual trend with stellar mass, star formation rate, redshift, or
morphology. The only significant residual trend is with the excess
obscuration of Hα by dust, at fixed continuum obscuration. The
scatter in continuum size at fixed stellar mass is likely driven by
the scatter in halo spin parameters. The stability of the ratio of
Hα size to continuum size demonstrates a high degree of
stability in halo spin and in the transfer of angular momentum to the
disk over a wide range of physical conditions and cosmic time. This
may require local regulation by feedback processes. The implication of
our results, as we demonstrate using a toy model, is that our upper
limit on star-formation-driven growth is sufficient only to evolve
star-forming galaxies approximately along the observed size-mass
relation, consistent with the size growth of galaxies at constant
cumulative comoving number density. To explain the observed evolution
of the size-mass relation of star-forming disk galaxies, other
processes, such as the preferential quenching of compact galaxies or
galaxy mergers, may be required.
Description:
KMOS3D is a unique 75-night guaranteed time program with the ESO
Very Large Telescope (VLT) with the second-generation instrument KMOS
(K-band Multi-Object Spectrograph) targeting the Ha+[NII]
emission-line complex in ∼740 galaxies selected to have a magnitude
Ks<23 (see Wisnioski+ 2019, J/ApJ/886/124).
Observations for KMOS3D were carried out from 2013 October until
2018 April. In this work we consider all data taken up until 2017 April.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 61 281 The size measurements table
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See also:
B/eso : ESO Science Archive Catalog (ESO, 1991-2021)
J/ApJ/706/1364 : SINS survey of high-redshift gal. (Forster Schreiber+, 2009)
J/A+A/553/A91 : Halpha3 survey of Virgo and Coma galaxies (Fossati+, 2013)
J/ApJ/768/74 : PHIBSS: CO obs. of star-forming galaxies (Tacconi+, 2013)
J/A+A/557/A137 : Dust effects on photometric param. in spirals (Pastrav+ 2013)
J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014)
J/A+A/579/A102 : Hα imaging of Herschel Reference Survey (Boselli+, 2015)
J/ApJ/816/L14 : Tully-Fisher relation in disk gal. from SPARC (Lelli+, 2016)
J/ApJ/827/74 : [NII]/Hα ratio in galaxies with KMOS3D (Wuyts+, 2016)
J/ApJS/225/27 : 3D-HST Survey: grism spectra master catalog (Momcheva+, 2016)
J/ApJ/835/153 : Galaxy environment in 3D-HST fields (z=0.5-3) (Fossati+, 2017)
J/ApJ/868/133 : j-M relation for disk and bulge type galaxies (Fall+, 2018)
J/ApJ/877/103 : Half-mass radii for ∼7000 gal. at 1.0≤z≤2.5 (Suess+, 2019)
J/ApJ/886/124 : Completed KMOS3D survey NIR obs. (Wisnioski+, 2019)
http://www.mpe.mpg.de/ir/KMOS3D : KMOS3D home page
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- ID KMOS3D identifier
from Wisnioski+, 2019, J/ApJ/886/124
12- 21 A10 --- Target KMOS3D ID as it was targeted for observations
23- 29 F7.5 --- z [0.62/2.68] Spectroscopic redshift
31- 35 F5.3 kpc reF160W [0.6/9.5] Effective radius
in CANDELS WFC3/F160W images
37- 41 F5.3 kpc e_reF160W [0.009/0.7] Uncertainty in reF160W
43- 48 F6.3 kpc reHa [1/14.8] Effective radius
in KMOS Halpha images
50- 54 F5.3 kpc e_reHa [0.2/10] Lower uncertainty in reHa
56- 61 F6.3 kpc E_reHa [0.2/94] Upper uncertainty in reHa
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-Aug-2021