Determining dark matter content of Milky Way satellite galaxies - - PowerPoint PPT Presentation
Determining dark matter content of Milky Way satellite galaxies with current and future facilities Mei-Yu Wang Carnegie Mellon University Conference on Shedding Light on the Dark Universe with Extremely Large Telescopes, Trieste, July 5th,
Drlica-Wagner et al., the DES collaboration (2015)
Plot credit: Keith Bechtol
confirmed)
HSC…
Homma+(2017) Subaru Hyper Suprime-Cam (HSC)
Ackermann et al., the Fermi-LAT collaboration (2015)
Albert et al. (2017) the Fermi-LAT collaboration
– populating stellar luminosity function using ishochron models – Stellar kinematic modeling – Exposure time calculator for several current instruments. – Predictions for future instruments
MYW, Drlica-Wagner, Li, Strigari (2018), in preparation
10 min (x4) 25 min (x4)
velocity dispersion ~ 3-5 km/s
Simon+(2015) Walker+(2015)
8 10 12 14 16 18 20 22
Vmax[km/s]
0.5 1.0 1.5 2.0 2.5
rmax[kpc]
4 . 6.0 8.0 1 . 12.0
Reticulum II
10 15 20 25 30 35
Vmax[km/s]
1 2 3 4
rmax[kpc]
.0 4.0 6.0 8 . 10.0 12.0 14.0 16.0
Segue 1 MYW, Cherry, Strigari and Horiuchi (2018)
Velocity-dependent cross section DM velocity distribution f(v)
Interaction between DM described by a Yukawa potential Sommerfeld enhancement factor
10−5 10−4 10−3 10−2 10−1 100 101 102
✏φ
1018 1019 1020 1021 1022 1023 1024
JS [GeV2/cm5]
Reticulum II
10−5 10−4 10−3 10−2 10−1 100 101 102
✏φ
Coma Berenices
10−5 10−4 10−3 10−2 10−1 100 101 102
✏φ
Segue 1
10−5 10−4 10−3 10−2 10−1 100 101 102
✏φ
1018 1019 1020 1021 1022 1023 1024
JS [GeV2/cm5]
Draco
10−5 10−4 10−3 10−2 10−1 100 101 102
✏φ
Ursa Minor
Non-enhanced limit Coulomb-like potential
Albert et al. (2017)
Boddy, Kumar, Strigari, MYW (2017)
Coarse-grained phase-space density Fine-grained phase-space density 100 101 mµs [keV] 10−13 10−12 10−11 10−10 10−9 10−8 10−7 sin22θV
Non − Resonant L6 ≥ 2500
X − ray
Combined dSph limit Segue 1 Draco II Cetus II (Forecast) Tucana V (Forecast)
MYW, Cherry, Strigari and Horiuchi (2018)