2022A&A...658A..76B


Query : 2022A&A...658A..76B

2022A&A...658A..76B - Astronomy and Astrophysics, volume 658A, 76-76 (2022/2-1)

The MUSE Extremely Deep Field: Evidence for SFR-induced cores in dark-matter dominated galaxies at z ≃ 11.

BOUCHE N.F., BERA S., KRAJNOVIC D., EMSELLEM E., MERCIER W., SCHAYE J., EPINAT B., RICHARD J., ZOUTENDIJK S.L., ABRIL-MELGAREJO V., BRINCHMANN J., BACON R., CONTINI T., BOOGAARD L., WISOTZKI L., MASEDA M. and STEINMETZ M.

Abstract (from CDS):


Context. Disc-halo decompositions z = 1 - 2 star-forming galaxies (SFGs) at z > 1 are often limited to massive galaxies (M* > 1010 M) and rely on either deep integral field spectroscopy data or stacking analyses.
Aims. We present a study of the dark-matter (DM) content of nine z ≃ 1 SFGs selected among the brightest [OII] emitters in the deepest Multi-Unit Spectrograph Explorer (MUSE) field to date, namely the 140 h MUSE Extremely Deep Field. These SFGs have low stellar masses, ranging from 108.5 to 1010.5 M.
Methods. We analyzed the kinematics with a 3D modeling approach, which allowed us to measure individual rotation curves to ≃3 times the half-light radius Re. We performed disk-halo decompositions on their [OII] emission line with a 3D parametric model. The disk-halo decomposition includes a stellar, DM, gas, and occasionally a bulge component. The DM component primarily uses the generalized α, β, γ profile or a Navarro-Frenk-White profile.
Results. The disk stellar masses M* obtained from the [OII] disk-halo decomposition agree with the values inferred from the spectral energy distributions. While the rotation curves show diverse shapes, ranging from rising to declining at large radii, the DM fractions within the half-light radius fDM(< Re) are found to be 60% to 95%, extending to lower masses (densities) recent results who found low DM fractions in SFGs with M* > 1010 M. The DM halos show constant surface densities of ∼100 M pc–2. For isolated galaxies, half of the sample shows a strong preference for cored over cuspy DM profiles. The presence of DM cores appears to be related to galaxies with low stellar-to-halo mass ratio, log M*/Mvir ≃ -2.5. In addition, the cuspiness of the DM profiles is found to be a strong function of the recent star-formation activity.
Conclusions. We measured the properties of DM halos on scales from 1 to 15 kpc, put constraints on the z > 0 cvir - Mvir scaling relation, and unveiled the cored nature of DM halos in some z ≃ 1 SFGs. These results support feedback-induced core formation in the cold dark matter context.

Abstract Copyright: © N. F. Bouché et al. 2022

Journal keyword(s): galaxies: high-redshift - galaxies: evolution - galaxies: formation - galaxies: kinematics and dynamics - methods: data analysis

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 ASPECS LP.1mm.C32 EmG 03 32 37.735 -27 47 06.95 25.6182 25.7507 24.457   23.33 ~ 21 0
2 EIS-DEEP CDFS-2 J 1 796 EmG 03 32 38.596 -27 46 31.36 23.7490 23.3146 22.519 21.990 21.7449 ~ 35 0
3 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1661 0
4 GOODS-MUSIC 10838 EmG 03 32 39.575 -27 46 43.43   25.2445 25.32     ~ 16 0
5 EIS-DEEP CDFS-2 J 1 1052 G 03 32 40.216 -27 47 33.05 24.0616 23.9032 23.727 23.42   ~ 22 0
6 EIS-DEEP CDFS-2 J 1 1021 EmG 03 32 40.324 -27 47 22.81 24.2367 24.159 23.549 23.250 23.0060 ~ 30 0
7 GOODS-MUSIC 9799 G 03 32 40.610 -27 47 30.22 25.5251 25.2145 24.364     ~ 10 0
8 GOODS-MUSIC 9722 G 03 32 41.119 -27 47 34.59 25.1259 25.0640 24.840   24.17 ~ 16 0
9 EIS-DEEP CDFS-2 J 1 991 G 03 32 41.767 -27 47 16.82 25.0585 24.9151 24.597   24.0994 ~ 22 0
10 [IBB2017] 937 AGN 03 32 41.865 -27 46 51.10 25.0069 24.7863 24.328   23.5126 ~ 20 0
11 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4793 2

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