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19 April 2024 |
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Article overview
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Evidence of a population of dark subhalos from Gaia and Pan-STARRS observations of the GD-1 stream | | Nilanjan Banik
; Jo Bovy
; Gianfranco Bertone
; Denis Erkal
; T.J.L. de Boer
; | | Date: |
6 Nov 2019 | | Abstract: | New data from the $ extit{Gaia}$ satellite, when combined with accurate
photometry from the Pan-STARRS survey, allow us to accurately estimate the
properties of the GD-1 stream. Here, we analyze the stellar density
perturbations in the GD-1 stream and show that they cannot be due to known
baryonic structures like giant molecular clouds, globular clusters, or the
Milky Way’s bar or spiral arms. A joint analysis of the GD-1 and Pal 5 streams
instead requires a population of dark substructures with masses $approx
10^{7}$ to $10^9 M_{
m{odot}}$. We infer a total abundance of dark subhalos
normalised to standard cold dark matter $n_{
m sub}/n_{
m sub, CDM} = 0.4
^{+0.3}_{-0.2}$ ($68 \%$), which corresponds to a mass fraction contained in
the subhalos $f_{
m{sub}} = 0.14 ^{+0.11}_{-0.07} \%$, compatible with the
predictions of hydrodynamical simulation of cold dark matter with baryons. | | Source: | arXiv, 1911.2662 | | Services: | Forum | Review | PDF | Favorites | |
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