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SUMMARY:The Dark Matter Density Profiles of Antlia B
DTSTART;VALUE=DATE-TIME:20230322T084000Z
DTEND;VALUE=DATE-TIME:20230322T085500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115733Z
UID:indico-contribution-201@meetings.aip.de
DESCRIPTION:Speakers: Mariana P. Júlio (AIP)\nOne particularly promising 
 way to understand the nature of dark matter is to study the so-called core
 -cusp problem. Many solutions have been investigated to solve it and one p
 ossibility is that the nature of the dark matter itself is different from 
 the successful $\\Lambda$-Cold Dark Matter model. To reduce the impact of 
 baryonic physics which obscures our ability to constrain dark matter\, we 
 need to study the most dark matter dominated systems known\, ultra-faint d
 warfs. \nHere we present the first spectroscopic observations of the Antli
 a B\, a distant (d ∼ 1.35 Mpc) ultra-faint dwarf ($M_V = -9.4$\, M$_\\st
 ar ∼ 8\\times 10^5$M$_\\odot$ )\, from MUSE-Faint – a survey of ultra-
 faint dwarfs with the Multi Unit Spectroscopic Explorer. We measure line-o
 f-sight velocities of 127 member stars\, and combine these with GravSphere
 \, a Jeans modelling code\, to place constraints on dark matter and derive
  the first dark matter density profile for this object.\n In particular we
  present constraints on the nature of self-interacting dark matter (SIDM) 
 that is based on the assumption that the dark matter particles can scatter
  with one another\, being able to transport heat through the dark matter h
 alo\, altering the halo structure – and\, possibly\, producing a constan
 t-density core in the heart of the halo\; and scalar field dark matter (SF
 DM) that is a Bose-Einstein condensate and a quantum superfluid and can su
 ppress structure formation when there is a strong repulsive self-interacti
 on. These are to our knowledge the first constraints on SFDM using ultra-f
 aint dwarf galaxies and we show that we can rule out SFDM as an explanatio
 n for the cores in the larger dwarf galaxies in the Local Group. We also s
 how that if Antlia B has a core produced by SFDM\, the characteristic leng
 th scale of the repulsive self-interaction has to be smaller than $R_{\\te
 xt{TF}} \\approx 0.37$ kpc.\n\nhttps://meetings.aip.de/event/20/contributi
 ons/201/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/20/contributions/201/
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