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  The kinematics of massive quiescent galaxies at 1.4 < z < 2.1: dark matter fractions, IMF variation, and the relation to local early-type galaxies

Mendel, T. J., Beifiori, A., Saglia, R. P., Bender, R., Brammer, G. B., Chan, J., et al. (2020). The kinematics of massive quiescent galaxies at 1.4 < z < 2.1: dark matter fractions, IMF variation, and the relation to local early-type galaxies. The Astrophysical Journal, 899(1): 87. doi:10.3847/1538-4357/ab9ffc.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-715C-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-715D-2
Genre: Journal Article

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The Kinematics of Massive Quiescent Galaxies at 1.4 z 2.1 Dark Matter Fractions, IMF Variation, and the Relation to Local Early-type Galaxies.pdf (Any fulltext), 6MB
 
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 Creators:
Mendel, Trevor J.1, Author              
Beifiori, Alessandra1, Author              
Saglia, Roberto P.1, Author              
Bender, Ralf1, Author              
Brammer, Gabriel B., Author
Chan, Jeffrey, Author
Förster Schreiber, N. M.2, Author              
Fossati, Matteo1, Author              
Galametz, Audrey, Author
Momcheva, Ivelina G., Author
Nelson, Erica J., Author
Wilman, Dave J.1, Author              
Wuyts, Stijn2, Author              
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 study the dynamical properties of massive quiescent galaxies at 1.4 < z < 2.1 using deep Hubble Space Telescope WFC3/F160W imaging and a combination of literature stellar velocity dispersion measurements and new near-infrared spectra obtained using the K-band Multi Object Spectrograph (KMOS) on the ESO Very Large Telescope. We use these data to show that the typical dynamical-to-stellar mass ratio has increased by ~0.2 dex from z = 2 to the present day, and we investigate this evolution in the context of possible changes in the stellar initial mass function (IMF) and/or fraction of dark matter contained within the galaxy effective radius, f DM[<r e]. Comparing our high-redshift sample to their likely descendants at low redshift, we find that f DM[<r e] has increased by a factor of more than 4 since z ≈ 1.8, from f DM[<r e] = 6.6% ± 1.0% to ~24%. The observed increase appears robust to changes in the methods used to estimate dynamical masses or match progenitors and descendants. We quantify possible variation of the stellar IMF through the offset parameter α, defined as the ratio of dynamical mass in stars to the stellar mass estimated using a Chabrier IMF. We demonstrate that the correlation between stellar velocity dispersion and α reported among quiescent galaxies at low redshift is already in place at z = 2, and we argue that subsequent evolution through (mostly minor) merging should act to preserve this relation while contributing significantly to galaxies' overall growth in size and stellar mass.

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 Dates: 2020-08-14
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab9ffc
Other: LOCALID: 3265179
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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: 899 (1) Sequence Number: 87 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3