2025MNRAS.537..204P

Query : 2025MNRAS.537..204P

2025MNRAS.537..204P - Mon. Not. R. Astron. Soc., 537, 204-216 (2025/February-2)

Properties of the lower segment of M31's North West stream.

PRESTON J., ERKAL D., COLLINS M.L.M., IBATA R. and RICH R.M.

Abstract (from CDS):

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 $\sim$80 kpc from the centre of the Andromeda galaxy. We measure the stream's systemic velocity as -439.3$^{+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\pm0.1$$\le$$\langle[\mathrm{ Fe/H}]_{\rm spec}\rangle$$\le$$-1.2\pm0.8$ 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.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): galaxies: dwarf - galaxies: interactions - Local Group

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME PA-4 GlC 00 04 42.9232919640 +47 21 42.266802780           ~ 11 0
2 NAME PA-9 GlC 00 12 54.6683793456 +45 05 55.794852888           ~ 10 0
3 NAME PA-10 GlC 00 13 38.660 +45 11 11.13           ~ 9 0
4 NAME PA-11 GlC 00 14 55.630 +44 37 16.35           ~ 10 0
5 NAME PA-12 GlC 00 17 40.080 +43 18 39.02           ~ 10 0
6 NAME PA-13 GlC 00 17 42.7190254224 +43 04 31.723352292           ~ 8 0
7 NAME PA-15 GlC 00 22 44.070 +41 56 14.16           ~ 8 0
8 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
9 NAME Andromeda XXVII G 00 37 27.1 +45 23 13     16.7     ~ 82 0
10 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
11 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
12 NAME Elqui Stream St* 00 43 -36.9           ~ 22 0
13 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
14 NAME Cetus-Palca Stream St* 01 31 +01.0           ~ 97 1
15 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
16 NAME Turranburra Stream St* 03 57 -18.0           ~ 13 0
17 NAME Jhelum Stream St* 21 25 -45.1           ~ 40 0
18 NAME Andromeda Stream St* ~ ~           ~ 77 1
19 NAME Local Group GrG ~ ~           ~ 9325 0

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