Charting the Galactic acceleration field I. A search for stellar streams with Gaia DR2 and EDR3 with follow-up from ESPaDOnS and UVES

Arnaud Siebert; Benoit Famaey; Dominique Aubert; Elisabetta Caffau; Florent Renaud; Giacomo Monari; Guillaume F. Thomas; Khyati Malhan; Michele Bellazzini; Nicolas Martin

Charting the Galactic acceleration field I. A search for stellar streams with Gaia DR2 and EDR3 with follow-up from ESPaDOnS and UVES

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arxiv 2012.05245 v2 pith:LQTTC4BO submitted 2020-12-09 astro-ph.GA

Rodrigo Ibata , Khyati Malhan , Nicolas Martin , Dominique Aubert , Benoit Famaey , Paolo Bianchini , Giacomo Monari , Arnaud Siebert

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Guillaume F. Thomas Michele Bellazzini Piercarlo Bonifacio Elisabetta Caffau Florent Renaud

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keywords streamsstellardetectededr3accelerationdataespadonsfield

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abstract

We present maps of the stellar streams detected in the Gaia Data Release 2 (DR2) and Early Data Release 3 (EDR3) catalogs using the STREAMFINDER algorithm. We also report the spectroscopic follow-up of the brighter DR2 stream members obtained with the high-resolution CFHT/ESPaDOnS and VLT/UVES spectrographs as well as with the medium-resolution NTT/EFOSC2 spectrograph. Two new stellar streams that do not have a clear progenitor are detected in DR2 (named Hrid and Gunnthra), and seven are detected in EDR3 (named Gaia-6 to Gaia-12). Several candidate streams are also identified. The software also finds very long tidal tails associated with the 15 globular clusters NGC 288, NGC 1261, NGC 1851, NGC 2298, NGC 2808, NGC 3201, M 68, $\omega$Cen, NGC 5466, Palomar 5, M 5, NGC 6101, M 92, NGC 6397 and NGC 7089. These stellar streams will be used in subsequent contributions in this series to chart the properties of the Galactic acceleration field on $\sim$ 100 pc to $\sim$ 100 kpc scales.

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Constraints on the population level distribution of nearby Dark Matter halo shapes with extragalactic streams
astro-ph.GA 2026-07 conditional novelty 5.5 of 10

A gold subsample of 17 photometry-only extragalactic streams yields a mildly oblate dark-matter halo population with mean flattening μ_q ≈ 0.72 and scatter σ_q ≈ 0.34.

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