Orbital Torus Imaging: Using elemental abundances to map orbital structure and mass in the Galactic disc

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• Daniel Horta Darrington (CCA, New York)
• Wednesday 17 May 2023, 13:15-13:40
• The Hoyle Lecture Theatre + Zoom .

If you have a question about this talk, please contact Hannah Uebler.

Under the assumption of a simple and time invariant potential, many Galactic dynamics techniques use tools (e.g., Jeans or Schwartzchild models) to infer the Milky Way’s potential from stellar kinematic observations. Albeit useful, these methods rely heavily on parameterised potential models of the Galaxy and must take into account non-trivial selection function effects. However, large-scale spectroscopic surveys now supply information beyond kinematics in the form of precise stellar label measurements (e.g., elemental abundances). In this talk, I will present a new framework that uses kinematic and element abundance measurements for dynamical inference: Orbital Torus Imaging. This method is advantageous as it is much less affected by selection function effects and does not require parameterisation of a potential model. Using this framework, I will present preliminary results utilising the latest APOGEE and Gaia data on mapping the orbital structure and mass of the Galactic disc using chemical abundance information. These early findings reveal the power of Orbital Torus Imaging, and highlight a promising new avenue for dynamical inference that synergises stellar labels and kinematic observations delivered by large scale stellar surveys of the Galaxy.

This talk is part of the Institute of Astronomy Seminars series.

This talk is included in these lists:

• Combined External Astrophysics Talks DAMTP
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• Cosmology, Astrophysics and General Relativity
• Institute of Astronomy Seminars
• Institute of Astronomy Talk Lists
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• The Hoyle Lecture Theatre + Zoom

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