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Article overview
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Galactic potential constraints from clustering in action space of combined stellar stream data | | Stella Reino
; Elena M. Rossi
; Robyn E. Sanderson
; Elena Sellentin
; Amina Helmi
; Helmer H. Koppelman
; Sanjib Sharma
; | | Date: |
1 Jul 2020 | | Abstract: | Stream stars removed by tides from their progenitor satellite galaxy or
globular cluster act as a group of test particles on neighboring orbits,
probing the gravitational field of the Milky Way. While constraints from
individual streams have been shown to be susceptible to biases, combining
several streams from orbits with various distances reduces these biases. We fit
a common gravitational potential to multiple stellar streams simultaneously by
maximizing the clustering of the stream stars in action space. We apply this
technique to members of the GD-1, Pal 5, Orphan and Helmi streams, exploiting
both the individual and combined data sets. We describe the Galactic potential
with a St"ackel model, and vary up to five parameters simultaneously. We find
that we can only constrain the enclosed mass, and that the strongest
constraints come from the GD-1 and Pal 5 streams whose combined data set yields
$M(< 20 mathrm{kpc}) = 3.47^{+0.95}_{-1.44} imes 10^{11} M_{odot}$. When
including the Orphan and Helmi stream in the data set, the mass uncertainty
increases to $M(< 20 mathrm{kpc}) = 3.12^{+5.69}_{-1.07} imes 10^{11}
M_{odot}$, indicative of the hidden systematic errors in fits to individual
streams. These systematics are likely due to insufficiencies in our St"ackel
model of the potential and to the limited phase space explored by the data set
of 4 streams, so the larger uncertainty of the combined fit is the more robust
measure of the actual uncertainty in the Milky Way potential. | | Source: | arXiv, 2007.0356 | | Services: | Forum | Review | PDF | Favorites | |
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