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  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., et al. (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. The Astrophysical Journal, 892(1): 1. doi:10.3847/1538-4357/ab7914.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-5516-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-5517-1
Genre: Journal Article

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 Creators:
Wilman, David J.1, Author              
Fossati, Matteo1, Author              
Mendel, J. Trevor1, Author              
Saglia, Roberto1, Author              
Wisnioski, Emily2, Author              
Wuyts, Stijn2, Author              
Förster Schreiber, Natascha2, Author              
Beifiori, Alessandra1, Author              
Bender, Ralf1, Author              
Belli, Sirio2, Author              
Übler, Hannah2, Author              
Lang, Philipp2, Author              
Chan, Jeffrey C. C.1, Author              
Davies, Rebecca L.2, Author              
Nelson, Erica J.2, Author              
Genzel, Reinhard2, Author              
Tacconi, Linda J.2, Author              
Galametz, Audrey1, Author              
Davies, R. I.2, Author              
Lutz, Dieter2, Author              
Price, Sedona2, Author              Burkert, Andreas1, Author              Tadaki, Ken-ichi2, Author              Herrera-Camus, Rodrigo2, Author              Brammer, Gabriel, AuthorMomcheva, Ivelina, Authorvan Dokkum, Pieter, Author more..
Affiliations:
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              
2Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 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%. KMOS3D 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 KMOS3D 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 KMOS3D 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 KMOS3D 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.

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 Dates: 2020-03-19
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab7914
Other: LOCALID: 3223873
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 892 (1) Sequence Number: 1 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3