Properties of the lower segment of M31’s North West stream

Janet Preston; Denis Erkal; Michelle Collins; Rodrigo A. Ibata; R Michael Rich

doi:10.1093/mnras/stae2726

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Properties of the lower segment of M31’s North West stream

Journal article

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Properties of the lower segment of M31’s North West stream

Janet Preston, Denis Erkal, Michelle Collins, Rodrigo A. Ibata and R Michael Rich

Monthly notices of the Royal Astronomical Society, Vol.537(1), pp.204-216

12/12/2024

DOI: https://doi.org/10.1093/mnras/stae2726

Abstract

Galaxies: kinematics and dynamics

We present a kinematic and spectroscopic analysis of 40 red giant branch stars, in 9 fields, exquisitely delineating the lower segment of the North West stream (NW-K2), which extends for ∼80 kpc from the centre of the Andromeda galaxy. We measure the stream’s systemic velocity as −439.3+4.1 −3.8 km s−1 with a velocity dispersion =16.4+5.6 −3.8 km s−1 that is in keeping with its progenitor being a dwarf galaxy. We find no detectable velocity gradient along the stream. We determine −1.3 ± 0.1≤[Fe/H]spec≤−1.2 ± 0.8 but find no metallicity gradient along the stream. We are able to plausibly associate NW-K2 with the globular clusters PAndAS-04, PAndAS-09, PAndAS-10, PAndAS-11, and PAndAS-12 but not with PAndAS-13 or PAndAS-15, which we find to be superimposed on the stream but not kinematically associated with it

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Title: Properties of the lower segment of M31’s North West stream
Creators: Janet Preston - University of Surrey, School of Maths and Physics
Denis Erkal (Author) - University of Surrey, School of Maths and Physics
Michelle Collins (Author) - University of Surrey, School of Maths and Physics
Rodrigo A. Ibata (Author) - Observatoire astronomique de Strasbourg
R Michael Rich (Author) - University of California, Los Angeles
Publication Details: Monthly notices of the Royal Astronomical Society, Vol.537(1), pp.204-216
Publisher: Oxford University Press; OXFORD
Number of pages: 13
Publication Date: 12/12/2024
Date accepted for publication: 12/09/2024
Grant note: California Institute of Technology
The authors wish to thank the anonymous reviewer for their insightful comments and advice. JP wishes to thank Stuart Sullivan, Joan Sullivan, and Barry Sullivan for their inspiration. JP also wishes to thank Mark Fardal and Dougal Mackey for their generous donations of data and private communications.
Identifiers: 99965366602346; WOS:001398142600001
Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited
Academic Unit: School of Maths and Physics
Language: English
Resource Type: Journal article
Data Access Statement: The data used in this paper are available herein, in Preston et al. (2019), and in their associated online supplementary materials. The raw DEIMOS data are available via the Keck archive.

Properties of the lower segment of M31’s North West stream

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