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SUMMARY:Constraints on dark matter distribution in dwarf spheroidal galaxi
 es based on the 4th-order Jeans analysis
DTSTART;VALUE=DATE-TIME:20230320T114700Z
DTEND;VALUE=DATE-TIME:20230320T114900Z
DTSTAMP;VALUE=DATE-TIME:20241114T092411Z
UID:indico-contribution-230@meetings.aip.de
DESCRIPTION:Speakers: M. Dafa Wardana (Astronomical Institute\, Tohoku Uni
 versity)\nThe mass-anisotropy degeneracy is still one of the main issues i
 n estimating the dark matter distribution in dwarf spheroidal galaxies\, e
 specially for the commonly used second-order Jeans analysis. We study the 
 extension of spherical Jeans modeling by incorporating the fourth-order ve
 locity moments under the assumption of dynamical equilibrium and a constan
 t velocity anisotropy. The inclusion of fourth-order velocity moments allo
 ws stars’ l.o.s velocity distribution\, which is sensitive to the value 
 of the velocity anisotropy parameter\, to be flexible\, covering thin-tail
 ed to heavy-tailed distributions that is inaccessible if only second-order
  moments are used. We test our stellar dynamical modeling using mock data 
 that resembles Draco dSph with either central NFW cusp or Burkert core and
  isotropic velocity anisotropy. Using 500 sample stars\, our simulations s
 how that incorporating fourth-order velocity moments improves the results 
 compared to when only second-order moments are used. Typically\, the veloc
 ity anisotropy is constrained two times better\, while it is ~50% improvem
 ent for the constraint of the inner dark matter density slope with both pa
 rameters being recovered within 1σ uncertainties.\n\nhttps://iaus379.aip.
 de/event/20/contributions/230/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/230/
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