The Regulation of Galaxy Growth along the Size-Mass Relation by Star Formation, as Traced by H alpha in KMOS3D Galaxies at 0.7 less than or similar to z less than or similar to 2.7
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The Regulation of Galaxy Growth along the Size-Mass Relation by Star Formation, as Traced by H alpha in KMOS3D Galaxies at 0.7 less than or similar to z less than or similar to 2.7. / Wilman, David J.; Fossati, Matteo; Mendel, J. Trevor; Saglia, Roberto; Wisnioski, Emily; Wuyts, Stijn; Schreiber, Natascha Foerster; Beifiori, Alessandra; Bender, Ralf; Belli, Sirio; Uebler, Hannah; Lang, Philipp; Chan, Jeffrey C. C.; Davies, Rebecca L.; Nelson, Erica J.; Genzel, Reinhard; Tacconi, Linda J.; Galametz, Audrey; Davies, Richard I.; Lutz, Dieter; Price, Sedona; Burkert, Andreas; Tadaki, Ken-ichi; Herrera-Camus, Rodrigo; Brammer, Gabriel; Momcheva, Ivelina; van Dokkum, Pieter.
In: Astrophysical Journal, Vol. 892, No. 1, 1, 20.03.2020.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The Regulation of Galaxy Growth along the Size-Mass Relation by Star Formation, as Traced by H alpha in KMOS3D Galaxies at 0.7 less than or similar to z less than or similar to 2.7
AU - Wilman, David J.
AU - Fossati, Matteo
AU - Mendel, J. Trevor
AU - Saglia, Roberto
AU - Wisnioski, Emily
AU - Wuyts, Stijn
AU - Schreiber, Natascha Foerster
AU - Beifiori, Alessandra
AU - Bender, Ralf
AU - Belli, Sirio
AU - Uebler, Hannah
AU - Lang, Philipp
AU - Chan, Jeffrey C. C.
AU - Davies, Rebecca L.
AU - Nelson, Erica J.
AU - Genzel, Reinhard
AU - Tacconi, Linda J.
AU - Galametz, Audrey
AU - Davies, Richard I.
AU - Lutz, Dieter
AU - Price, Sedona
AU - Burkert, Andreas
AU - Tadaki, Ken-ichi
AU - Herrera-Camus, Rodrigo
AU - Brammer, Gabriel
AU - Momcheva, Ivelina
AU - van Dokkum, Pieter
PY - 2020/3/20
Y1 - 2020/3/20
N2 - We present half-light sizes measured from Ha emission tracing star formation in 281 star-forming galaxies from the KMOS3D survey at 0.7 less than or similar to z less than or similar to 2.7. Sizes are derived by fitting 2D exponential disk models, with bootstrap errors averaging 20%. H alpha 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 similar to 43% intrinsic scatter. At fixed continuum size the H alpha 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 H alpha 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 H alpha 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.
AB - We present half-light sizes measured from Ha emission tracing star formation in 281 star-forming galaxies from the KMOS3D survey at 0.7 less than or similar to z less than or similar to 2.7. Sizes are derived by fitting 2D exponential disk models, with bootstrap errors averaging 20%. H alpha 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 similar to 43% intrinsic scatter. At fixed continuum size the H alpha 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 H alpha 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 H alpha 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.
KW - PRESSURE STRIPPING EVENTS
KW - PHYSICAL-PROPERTIES
KW - MUSE SNEAKS
KW - DISK GALAXY
KW - GAS
KW - II.
KW - I.
KW - SPECTROSCOPY
KW - PROFILES
KW - ROTATION
U2 - 10.3847/1538-4357/ab7914
DO - 10.3847/1538-4357/ab7914
M3 - Journal article
VL - 892
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 1
ER -
ID: 247443147