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The MUSE Extremely Deep Field: Evidence for SFR-induced cores in dark-matter dominated galaxies at z=1

Abstract : Disc-halo decomposition on rotationally supported star-forming galaxies (SFGs) at $z>1$ are often limited to massive galaxies ($M_\star>10^{10}~M_\odot$) and rely on either deep Integral Field Spectroscopy data or stacking analyses. We present a study of the dark matter (DM) content of nine $z\approx1$ SFGs selected Using the brightest [OII] emitters in the deepest Multi-Unit Spectrograph Explorer (MUSE) field to date, namely the 140hr MUSE Extremely Deep Field, we perform disk-halo decompositions on 9 low-mass SFGs (with $10^{8.5}10^{10}~M_\odot$. The DM halos show constant surface densities of $\sim100~M_\odot$ pc$^{-2}$. 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 stellar-to-halo mass $\log M_\star/M_{\rm vir}\approx-2.5$. In addition, the cuspiness of the DM profiles is found to be a strong function of the recent star-formation activity. Both of these results are interpreted as evidence for feedback-induced core formation in the Cold Dark Matter context.
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Preprints, Working Papers, ...
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https://hal.archives-ouvertes.fr/hal-03450793
Contributor : Nicolas Bouché Connect in order to contact the contributor
Submitted on : Friday, November 26, 2021 - 6:00:32 PM
Last modification on : Thursday, December 2, 2021 - 3:41:24 AM

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  • HAL Id : hal-03450793, version 1
  • ARXIV : 2109.07545

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Nicolas F. Bouché, Samuel Bera, Davor Krajnovic, Eric Emsellem, Wilfried Mercier, et al.. The MUSE Extremely Deep Field: Evidence for SFR-induced cores in dark-matter dominated galaxies at z=1. 2021. ⟨hal-03450793⟩

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