Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Breddels, Maarten A."'
Publikováno v:
A&A 632, A99 (2019)
We test the ability of Schwarzschild's orbit superposition method in measuring the mass content, scale radius and shape of a flattened dwarf spheroidal galaxy. Until now, most dynamical model efforts have assumed that dwarf spheroidal galaxies and th
Externí odkaz:
http://arxiv.org/abs/1907.00156
Publikováno v:
A&A 621, A13 (2019)
Extended stellar haloes are a natural by-product of the hierarchical formation of massive galaxies. If merging is a non-negligible factor in the growth of our Galaxy, evidence of such events should be encoded in its stellar halo. Reliable identificat
Externí odkaz:
http://arxiv.org/abs/1804.05245
Publikováno v:
A&A 618, A13 (2018)
We present a new Python library called vaex, to handle extremely large tabular datasets, such as astronomical catalogues like the Gaia catalogue, N-body simulations or any other regular datasets which can be structured in rows and columns. Fast compu
Externí odkaz:
http://arxiv.org/abs/1801.02638
The dynamically selected stellar halo of the Galaxy with Gaia and the tilt of the velocity ellipsoid
Publikováno v:
A&A 615, A70 (2018)
We study the dynamical properties of halo stars located in the Solar Neighbourhood. Our goal is to explore how the properties of the halo depend on the selection criteria used for defining a sample of halo stars. Once this is understood we proceed to
Externí odkaz:
http://arxiv.org/abs/1711.04766
Autor:
Breddels, Maarten A.
With new catalogues arriving such as the Gaia DR1, containing more than a billion objects, new methods of handling and visualizing these data volumes are needed. In visualization, one problem is that the number of datapoints can become so large, that
Externí odkaz:
http://arxiv.org/abs/1612.04183
Publikováno v:
A&A 598, A58 (2017)
The hierarchical structure formation model predicts that stellar halos should form, at least partly, via mergers. If this was a predominant formation channel for the Milky Way's halo, imprints of this merger history in the form of moving groups or st
Externí odkaz:
http://arxiv.org/abs/1611.00222
We compare the dark matter halos' structural parameters derived for four Milky Way dwarf spheroidal galaxies to those of subhalos found in cosmological $N$-body simulations. We confirm that estimates of the mass at a single fixed radius are fully con
Externí odkaz:
http://arxiv.org/abs/1507.03995
We present a proper-motion study on models of the dwarf spheroidal galaxy Sculptor, based on the predicted proper-motion accuracy of Gaia measurements. Gaia will measure proper motions of several hundreds of stars for a Sculptor-like system. Even wit
Externí odkaz:
http://arxiv.org/abs/1502.01215
Autor:
Breddels, Maarten A., Helmi, Amina
In previous work we have presented Schwarzschild models of the Sculptor dSph, demonstrating that this system could be embedded in dark matter halos that are either cusped or cored. Here we show that the non-parametric distribution function recovered
Externí odkaz:
http://arxiv.org/abs/1404.5958
Autor:
Breddels, Maarten A., Helmi, Amina
We demonstrate the existence of distribution functions that can be used to represent spherical massless cored stellar systems embedded in cuspy dark matter halos with constant mildly tangential velocity anisotropy. In particular, we derive analytical
Externí odkaz:
http://arxiv.org/abs/1308.1690