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, David J.; Fossati, Matteo; Mendel, J. Trevor; Saglia, Roberto; Wisnioski, Emily; Wuyts, Stijn; Förster Schreiber, Natascha; Beifiori, Alessandra; Bender, Ralf; Belli, Sirio; Übler, Hannah; Lang, Philipp; Chan, Jeffrey C. C.; Davies, Rebecca L.; Nelson, Erica J.; Genzel, Reinhard; Tacconi, Linda J.; Galametz, Audrey; Davies, R. I.; Lutz, Dieter; Price, Sedona; Burkert, Andreas; Tadaki, Ken-ichi; Herrera-Camus, Rodrigo; Brammer, Gabriel; Momcheva, Ivelina; van Dokkum, Pieter

doi:10.3847/1538-4357/ab7914

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The regulation of galaxy growth along the size–mass relation by star formation, as traced by Hα in KMOS^3D galaxies at 0.7 ≲ z ≲ 2.7

MPG-Autoren

/persons/resource/persons4696

Wilman, David J.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons98961

Fossati, Matteo
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons96436

Mendel, J. Trevor
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons18398

Saglia, Roberto
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons98850

Wisnioski, Emily
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons27699

Wuyts, Stijn
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4923

Förster Schreiber, Natascha
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons49260

Beifiori, Alessandra
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4759

Bender, Ralf
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons187981

Belli, Sirio
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons128736

Übler, Hannah
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons132103

Lang, Philipp
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons134548

Chan, Jeffrey C. C.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons208361

Davies, Rebecca L.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons204550

Nelson, Erica J.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4590

Genzel, Reinhard
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4582

Tacconi, Linda J.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons145377

Galametz, Audrey
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4586

Davies, R. I.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4584

Lutz, Dieter
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons216308

Price, Sedona
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4602

Burkert, Andreas
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons146724

Tadaki, Ken-ichi
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons198009

Herrera-Camus, Rodrigo
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Zitation

Wilman, D. J., Fossati, M., Mendel, J. T., Saglia, R., Wisnioski, E., Wuyts, S., et al. (2020). The regulation of galaxy growth along the size–mass relation by star formation, as traced by Hα in KMOS^3D galaxies at 0.7 ≲ z ≲ 2.7. The Astrophysical Journal, 892(1): 1. doi:10.3847/1538-4357/ab7914.

Zitierlink: https://hdl.handle.net/21.11116/0000-0006-5516-2

Zusammenfassung

We present half-light sizes measured from Hα emission tracing star formation in 281 star-forming galaxies from the KMOS^3D survey at 0.7 ≲ z ≲ 2.7. Sizes are derived by fitting 2D exponential disk models, with bootstrap errors averaging 20%. KMOS^3D 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 KMOS^3D 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 KMOS^3D 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 KMOS^3D 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.