%0 Generic %1 banik2019evidence %A Banik, Nilanjan %A Bovy, Jo %A Bertone, Gianfranco %A Erkal, Denis %A de Boer, T. J. L. %D 2019 %K tifr %T Evidence of a population of dark subhalos from Gaia and Pan-STARRS observations of the GD-1 stream %U http://arxiv.org/abs/1911.02662 %X New data from the $Gaia$ 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 $10^9 \ M_ødot$. We infer a total abundance of dark subhalos normalised to standard cold dark matter $n_sub/n_sub, CDM = 0.4 ^+0.3_-0.2$ ($68 \%$), which corresponds to a mass fraction contained in the subhalos $f_sub = 0.14 ^+0.11_-0.07 \%$, compatible with the predictions of hydrodynamical simulation of cold dark matter with baryons.

@misc{banik2019evidence, abstract = {New data from the $\textit{Gaia}$ 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 $10^9 \ M_{\rm{\odot}}$. We infer a total abundance of dark subhalos normalised to standard cold dark matter $n_{\rm sub}/n_{\rm sub, CDM} = 0.4 ^{+0.3}_{-0.2}$ ($68 \%$), which corresponds to a mass fraction contained in the subhalos $f_{\rm{sub}} = 0.14 ^{+0.11}_{-0.07} \%$, compatible with the predictions of hydrodynamical simulation of cold dark matter with baryons.}, added-at = {2019-11-11T06:36:18.000+0100}, author = {Banik, Nilanjan and Bovy, Jo and Bertone, Gianfranco and Erkal, Denis and de Boer, T. J. L.}, biburl = {https://www.bibsonomy.org/bibtex/240d66eca527f9ac87d717669e7dd8dd6/citekhatri}, description = {Evidence of a population of dark subhalos from Gaia and Pan-STARRS observations of the GD-1 stream}, interhash = {4ee096a57c1838497b964ca6da44c585}, intrahash = {40d66eca527f9ac87d717669e7dd8dd6}, keywords = {tifr}, note = {cite arxiv:1911.02662Comment: 20 pages, 13 figures. Also see companion paper : "Novel constraints on the particle nature of dark matter from stellar streams"}, timestamp = {2019-11-11T06:36:18.000+0100}, title = {Evidence of a population of dark subhalos from Gaia and Pan-STARRS observations of the GD-1 stream}, url = {http://arxiv.org/abs/1911.02662}, year = 2019 }