The Milky Way's satellite dwarf galaxies are powerful probes of many important astrophysical processes. Their kinematics provide insights into galactic dynamics and the nature of dark matter, while their chemical compositions preserve a history of early galaxy formation and nucleosynthesis. Recently, all-sky astrometry from the Gaia satellite has enabled the discovery and characterization of dwarf galaxies at different stages of tidal disruption. These new galaxies lie at the extremes of dwarf galaxy parameter space, whether in their structural properties or their star formation histories. In this talk, I will show how spectroscopic observations of the kinematics and chemistry of these newly discovered dwarf galaxies can provide crucial insights into galactic dynamics and nucleosynthesis. I will present a recent kinematic study of the extremely diffuse dwarf galaxy Antlia II that shows it is in the early stages of tidal disruption. The kinematics of Antlia II also clearly show that the Milky Way reference frame has been perturbed by the Large Magellanic Cloud. I will also highlight how two completely disrupted dwarf galaxies contribute to increasingly clear evidence that the rapid neutron-capture process requires both prompt and delayed sources to explain the diverse chemical evolution histories of dwarf galaxies.
Topic: UIUC Astronomy Colloquium
Time: This is a recurring meeting Meet anytime
Join Zoom Meeting
https://illinois.zoom.us/j/85471597820?pwd=Vll4Y2FySlAxeVJMaUpqR3Rnck5KUT09
Meeting ID: 854 7159 7820
Password: 599025
One tap mobile
+13126266799,,85471597820# US (Chicago)
+16465189805,,85471597820# US (New York)
Dial by your location
+1 312 626 6799 US (Chicago)
+1 646 518 9805 US (New York)
+1 651 372 8299 US (Minnesota)
+1 786 635 1003 US (Miami)
+1 929 205 6099 US (New York)
+1 267 831 0333 US (Philadelphia)
+1 301 715 8592 US (Washington DC)
+1 470 250 9358 US (Atlanta)
+1 470 381 2552 US (Atlanta)
+1 669 219 2599 US (San Jose)
+1 669 900 6833 US (San Jose)
+1 720 928 9299 US (Denver)
+1 971 247 1195 US (Portland)
+1 213 338 8477 US (Los Angeles)
+1 253 215 8782 US (Tacoma)
+1 346 248 7799 US (Houston)
+1 602 753 0140 US (Phoenix)
+1 438 809 7799 Canada
+1 587 328 1099 Canada
+1 647 374 4685 Canada
+1 647 558 0588 Canada
+1 778 907 2071 Canada
+49 695 050 2596 Germany
+49 69 7104 9922 Germany
+44 203 481 5237 United Kingdom
+44 203 481 5240 United Kingdom
+44 131 460 1196 United Kingdom
+81 3 4578 1488 Japan
+61 3 7018 2005 Australia
+61 8 7150 1149 Australia
+61 2 8015 6011 Australia
+52 554 161 4288 Mexico
Meeting ID: 854 7159 7820
Password: 599025
Find your local number: https://illinois.zoom.us/u/kcUXmZsY7N
Join by SIP
85471597820@zoomcrc.com
Join by H.323
162.255.37.11 (US West)
162.255.36.11 (US East)
221.122.88.195 (China)
115.114.131.7 (India Mumbai)
115.114.115.7 (India Hyderabad)
213.19.144.110 (Amsterdam Netherlands)
213.244.140.110 (Germany)
103.122.166.55 (Australia Sydney)
103.122.167.55 (Australia Melbourne)
209.9.211.110 (Hong Kong SAR)
64.211.144.160 (Brazil)
69.174.57.160 (Canada Toronto)
65.39.152.160 (Canada Vancouver)
207.226.132.110 (Japan Tokyo)
149.137.24.110 (Japan Osaka)
Meeting ID: 854 7159 7820
Password: 599025
Join by Skype for Business
https://illinois.zoom.us/skype/85471597820
