Reliable mass calculation in spherical gravitating systems

Foivos I. Diakogiannis, Geraint F. Lewis, Rodrigo A. Ibata, Magda Guglielmo, Mark I. Wilkinson, Chris Power

Research output: Contribution to journalArticle

Abstract

We present an innovative approach to the methodology of dynamical modelling, allowing practical reconstruction of the underlying dark matter mass without assuming both the density and anisotropy functions. With this, the mass-anisotropy degeneracy is reduced to simple model inference, incorporating the uncertainties inherent with observational data, statistically circumventing the mass-anisotropy degeneracy in spherical collisionless systems. We also tackle the inadequacy that the Jeans method of moments has on small data sets, with the aid of Generative Adversarial Networks: we leverage the power of artificial intelligence to reconstruct the projected line-of-sight velocity distribution non-parametrically. We show, with realistic numerical simulations of dwarf spheroidal galaxies, that we can distinguish between competing dark matter distributions and recover the anisotropy and mass profile of the system.

Original languageEnglish
Pages (from-to)3356-3372
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume482
Issue number3
DOIs
Publication statusPublished - Jan 2019

Cite this

Diakogiannis, F. I., Lewis, G. F., Ibata, R. A., Guglielmo, M., Wilkinson, M. I., & Power, C. (2019). Reliable mass calculation in spherical gravitating systems. Monthly Notices of the Royal Astronomical Society, 482(3), 3356-3372. https://doi.org/10.1093/mnras/sty2931
Diakogiannis, Foivos I. ; Lewis, Geraint F. ; Ibata, Rodrigo A. ; Guglielmo, Magda ; Wilkinson, Mark I. ; Power, Chris. / Reliable mass calculation in spherical gravitating systems. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 482, No. 3. pp. 3356-3372.
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Diakogiannis, FI, Lewis, GF, Ibata, RA, Guglielmo, M, Wilkinson, MI & Power, C 2019, 'Reliable mass calculation in spherical gravitating systems' Monthly Notices of the Royal Astronomical Society, vol. 482, no. 3, pp. 3356-3372. https://doi.org/10.1093/mnras/sty2931

Reliable mass calculation in spherical gravitating systems. / Diakogiannis, Foivos I.; Lewis, Geraint F.; Ibata, Rodrigo A.; Guglielmo, Magda; Wilkinson, Mark I.; Power, Chris.

In: Monthly Notices of the Royal Astronomical Society, Vol. 482, No. 3, 01.2019, p. 3356-3372.

Research output: Contribution to journalArticle

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T1 - Reliable mass calculation in spherical gravitating systems

AU - Diakogiannis, Foivos I.

AU - Lewis, Geraint F.

AU - Ibata, Rodrigo A.

AU - Guglielmo, Magda

AU - Wilkinson, Mark I.

AU - Power, Chris

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KW - techniques: radial velocities

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KW - galaxies: kinematics and dynamics

KW - galaxies: statistics

KW - SYMMETRIC JEANS EQUATION

KW - ANISOTROPY DEGENERACY

KW - STELLAR-SYSTEMS

KW - CLUSTERS

KW - BREAKING

KW - MODELS

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