The MUSE Hubble ultra deep field survey: XVI. The angular momentum of low-mass star-forming galaxies - a cautionary tale and insights from TNG50

We investigate the specific angular momentum (sAM) <i>j<i/>(< <i>r<i/>) profiles of intermediate redshift (0.4 < <i>z<i/> < 1.4) star-forming galaxies (SFGs) in the relatively unexplored regime of low masses (down to <i>M<i/><sub>⋆<su...

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Main Authors:	Bouché, Nicolas F. (Author) , Genel, Shy (Author) , Pellissier, Alisson (Author) , Dubois, Cédric (Author) , Contini, Thierry (Author) , Epinat, Benoît (Author) , Pillepich, Annalisa (Author) , Krajnović, Davor (Author) , Nelson, Dylan (Author) , Abril-Melgarejo, Valentina (Author) , Richard, Johan (Author) , Boogaard, Leindert (Author) , Maseda, Michael (Author) , Mercier, Wilfried (Author) , Bacon, Roland (Author) , Steinmetz, Matthias (Author) , Vogelsberger, Mark (Author)
Format:	Article (Journal)
Language:	English
Published:	08 October 2021
In:	Astronomy and astrophysics Year: 2021, Volume: 654, Pages: 1-21
ISSN:	1432-0746
DOI:	10.1051/0004-6361/202040225
Online Access:	Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/202040225 Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2021/10/aa40225-20/aa40225-20.html
Author Notes:	Nicolas F. Bouché, Shy Genel, Alisson Pellissier, Cédric Dubois, Thierry Contini, Benoît Epinat, Annalisa Pillepich, Davor Krajnović, Dylan Nelson, Valentina Abril-Melgarejo, Johan Richard, Leindert Boogaard, Michael Maseda, Wilfried Mercier, Roland Bacon, Matthias Steinmetz, and Mark Vogelsberger

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Summary:	We investigate the specific angular momentum (sAM) <i>j<i/>(< <i>r<i/>) profiles of intermediate redshift (0.4 < <i>z<i/> < 1.4) star-forming galaxies (SFGs) in the relatively unexplored regime of low masses (down to <i>M<i/><sub>⋆<sub/> ∼ 10<sup>8<sup/> <i>M<i/><sub>⊙<sub/>) and small sizes (down to <i>R<i/><sub>e<sub/> ∼ 1.5 kpc), and we characterize the sAM scaling relation (i.e., Fall relation) and its redshift evolution. We have developed a 3D methodology to constrain sAM profiles of the star-forming gas using a forward modeling approach with GAlPAK<sup>3D<sup/> that incorporates the effects of beam smearing, yielding the intrinsic morpho-kinematic properties even with limited spatial resolution data. Using mock observations from the TNG50 simulation, we find that our 3D methodology robustly recovers the star formation rate (SFR)-weighted profiles down to a low effective signal-to-noise ratio of ⪆3. We applied our methodology blindly to a sample of 494 [O II]-selected SFGs in the MUSE Ultra Deep Field (UDF) 9 arcmin<sup>2<sup/> mosaic data, covering the unexplored 8 < log <i>M<i/><sub>⋆<sub/>/<i>M<i/><sub>⊙<sub/> < 9 mass range. We find that the (SFR-weighted) sAM relation follows with an index <i>α<i/> varying from <i>α<i/> = 0.3 to <i>α<i/> = 0.5, from log <i>M<i/><sub>⋆<sub/>/<i>M<i/><sub>⊙<sub/> = 8 to log <i>M<i/><sub>⋆<sub/>/<i>M<i/><sub>⊙<sub/> = 10.5. The UDF sample supports a redshift evolution , with which is consistent with the (1 + <i>z<i/>)<sup>−0.5<sup/> expectation from a universe in expansion. The scatter of the sAM sequence is a strong function of the dynamical state with , where <i>σ<i/> is the velocity dispersion at 2<i>R<i/><sub>e<sub/>. In TNG50, SFGs also form a plane, but it correlates more with galaxy size than with morphological parameters. Our results suggest that SFGs might experience a dynamical transformation, and lose their sAM, before their morphological transformation to becoming passive via either merging or secular evolution.
Item Description:	Gesehen am 27.01.2022
Physical Description:	Online Resource
ISSN:	1432-0746
DOI:	10.1051/0004-6361/202040225