Uncovering fossils of the distant Milky Way with UNIONS: NGC 5466 and its stellar stream

Jensen, Jaclyn; Thomas, Guillaume; McConnachie, Alan W.; Starkenburg, Else; Malhan, Khyati; Navarro, Julio; Martin, Nicolas; Famaey, Benoit; Ibata, Rodrigo; Chapman, Scott; Cuillandre, Jean-Charles; Gwyn, Stephen

doi:10.1093/mnras/stab2325

Title: Uncovering fossils of the distant Milky Way with UNIONS: NGC 5466 and its stellar stream

Journal Article · Thu Aug 12 00:00:00 UTC 2021 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stab2325 · OSTI ID:1817272

Jensen, Jaclyn; Thomas, Guillaume; McConnachie, Alan W.; Starkenburg, Else; Malhan, Khyati; Navarro, Julio;

;

; Ibata, Rodrigo; Chapman, Scott;

; Gwyn, Stephen

ABSTRACT We examine the spatial clustering of blue horizontal branch (BHB) stars from the u-band of the Canada–France Imaging Survey (CFIS, a component of the Ultraviolet Near-Infrared Optical Northern Survey, or UNIONS). All major groupings of stars are associated with previously known satellites, and among these is NGC 5466, a distant (16 kpc) globular cluster. NGC 5466 reportedly possesses a long stellar stream, although no individual members of the stream have previously been identified. Using both BHBs and more numerous red giant branch stars cross-matched to Gaia Data Release 2, we identify extended tidal tails from NGC 5466 that are both spatially and kinematically coherent. Interestingly, we find that this stream does not follow the same path as the previous detection at large distances from the cluster. We trace the stream across 31° of sky and show that it exhibits a very strong distance gradient in the range 10 < Rhelio < 30 kpc. We compare our observations to simple dynamical models of the stream and find that they are able to broadly reproduce the overall path and kinematics. The fact that NGC 5466 is so distant, traces a wide range of Galactic distances, has an identified progenitor, and appears to have recently had an interaction with the Galaxy’s disc makes it a unique test-case for dynamical modelling of the Milky Way.

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Sponsoring Organization:: USDOE

OSTI ID:: 1817272

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 507; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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