20-24 March 2023
Haus H, Telegrafenberg
Europe/Berlin timezone

Kinematics of The Tidally Disrupting Dwarf Galaxy Antlia II

21 Mar 2023, 17:35
Haus H, Telegrafenberg

Haus H, Telegrafenberg

Potsdam, Germany
Contributed talk SESSION 3 : Dwarf galaxies: dwarf spheroidal, ultra-faint dwarfs, dwarf irregulars SESSION 3 : Dwarf galaxies: dwarf spheroidal, ultra-faint dwarfs, dwarf irregulars


Alexander Ji


The Milky Way satellite dwarf galaxy Antlia II is one of the lowest surface brightness galaxies known. It has a size comparable to the Large Magellanic Cloud, but only 10^6 solar masses of stars. We present kinematic and chemical measurements from the Southern Stellar Stream Spectroscopic Survey using the AAT/2dF, which clearly demonstrate that Antlia II is tidally disrupting. The orbit and velocity gradient also clearly shows that the Milky Way has moved in response to the Large Magellanic Cloud. However, Antlia II currently lies on the galaxy mass-metallicity relation, suggesting that it has not lost too much stellar mass. These measurements constrain the density profile of Antlia II and generally illustrate the importance of full dynamic models when interpreting the masses of local group galaxies.

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Primary authors

Alexander Ji Sergey Koposov (University of Edinburgh) Ting Li (University of Toronto) Denis Erkal (University of Surrey) Andrew Pace (Carnegie Mellon University) Joshua Simon (Carnegie Observatories) Vasily Belokurov (University of Cambridge) Lara Cullinane (Australian National University) Gary Da Costa (Australian National University) Kyler Kuehn (Lowell Observatory) Geraint Lewis (University of Sydney) Dougal Mackey (Australian National University) Nora Shipp (Massachusetts Institute of Technology) Jeffrey Simpson (UNSW) Daniel Zucker (Macquarie University) Terese Hansen (Stockholm University) Joss Bland-Hawthorn (University of Sydney)

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