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Detection of density variations and off-track features in stellar streams

Published online by Cambridge University Press:  30 October 2025

A. Viswanathan Open the ORCID record for A. Viswanathan [Opens in a new window] ,
E. Starkenburg  and
A. F. Esselink
A. Viswanathan*
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, Landleven 12, 9747 AD Groningen, The Netherlands
E. Starkenburg
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, Landleven 12, 9747 AD Groningen, The Netherlands
A. F. Esselink
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, Landleven 12, 9747 AD Groningen, The Netherlands
*
email: viswanathan@astro.rug.nl
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Abstract

Stellar streams unveil galactic histories through gravitational interactions, mergers, and tidal disruptions. To explore the complex morphology of streams, we use a ∼47 million halo main sequence stars catalogue using Gaia DR3 proper motion and photometry information, the combination of which renders the reduced proper motion parameter. This sample with reliable photometric distances reaches out to ∼21 kpc thereby probing much further out than would be possible using reliable Gaia parallaxes. Binned velocity moments on-sky pop up several known streams in the inner halo - particularly retrograde structures, due to the kinematic selection. We select and characterise the streams GD-1, Jhelum and Phlegethon. The faint signs of disequilibrium in the form of kinks and density variations in these thin streams will paint a more detailed picture of the existence and properties of the dark matter sub-haloes that perturb them and in turn, the mass distribution of our Galaxy.

Keywords

Galaxy evolutionGalactic haloStellar streamsGalactic dynamicsDark matter

Information

Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 3 - 9
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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