Table · dataset · 2026
Andromeda XXV new member stars kinematics
Listed in IVOA Registry (Virtual Observatory)
Andromeda (And) XXV has previously been reported as a dwarf spheroidal galaxy (dSph) with little-to-no dark matter.
Description
However, the uncertainties on this result were significant. In this study, we nearly double the number of member stars and re-derive the kinematics and mass of And XXV.
We find that And XXV has a systemic velocity of v_r_ = -107.7 +/- 1.0 km/s and a velocity dispersion of {sigma}_v_ = 3.7^+1.2^_-1.1_ km/s. With this updated velocity dispersion and a new literature measurement of the radial surface brightness profile, we derive a mass contained within the half-light radius of M(r < r_h_) = 4.79^+3.0^_-2.9_
Read the rest (1 more)
- 10^6^ M_{sun}_. This mass corresponds to a mass-to-light ratio of [M/L]_rh_ = 25^+17^_-16_ M_{sun}_/L_{sun}_, demonstrating that And XXV is most-likely dark matter dominated. We also measure the metallicity of And XXV to be [Fe/H] = -1.9 +/- 0.1 dex, which is in agreement with previous results. Finally, we extend the analysis of And XXV to include mass modelling using GravSphere. We find that And XXV has a low central dark matter density, {rho}_DM_(150 pc) = 2.3^+1.4^_-1.1_
- 10^7^ M_{sun}_ kpc^-3^, which makes And XXV a clear outlier when compared to other local group dSphs of the similar stellar mass. In a companion paper, we will explore whether some combination of dark matter cusp-core transformations and/or tides can explain And XXV's low density.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/521/3527 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2023MNRAS.521.3527C ui.adsabs.harvard.edu/abs/2023MNRAS.521.3527C ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/mnras/521/3527 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/mnras/521/3527 | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |