14 citations · 112 across the 25 of their papers we have counts for
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Magnetic contribution to outer-disk rotation in the spiral galaxy NGC 5055
Natalia Woźniak, Joanna Jałocha, Łukasz Bratek +1
We test whether fields of galactic strength enhance NGC~5055's outer gas rotation. Finite analytic disk decompositions yield consistent rotation--density pairs and a blended gravit…
Magnetic flux density from the relative circular motion of stars and partially ionized gas in the Galaxy mid-plane vicinity
Joanna Jałocha, Łukasz Bratek, Jan Pękala +2
Observations suggest a slower stellar rotation relative to gas rotation in the outer part of the Milky Way Galaxy. This difference could be attributed to an interaction with the in…
Velocity dispersion as a factor modifying the distribution of mass in disk-like galaxies -- an example of galaxy UGC 6446
Szymon Sikora, Łukasz Bratek, Joanna Jałocha +1
Within the disk model framework used to approximately describe flattened galaxies, we develop an iterative method of determining column mass density from rotation curve supplemente…
Velocity-density twin transforms in thin disk model
Łukasz Bratek, Szymon Sikora, Joanna Jałocha +1
Ring mass density and the corresponding circular velocity in thin disk model are known to be integral transforms of one another. But it may be less familiar that the transforms can…
Motion of halo compact objects in the gravitational potential of a low-mass model of the Galaxy
Szymon Sikora, Łukasz Bratek, Joanna Jałocha +1
Recently, we determined a lower bound for the Milky Way mass in a point mass approximation. This result was obtained for most general spherically symmetric phase-space distribution…
Constraining the vertical structure of the Milky Way rotation by microlensing in a finite-width global disk model
Joanna Jałocha, Szymon Sikora, Łukasz Bratek +1
In this paper we model the vertical structure of mass distribution of the Milky Way galaxy in the framework of a finite-width global disk model. Assuming the Galactic rotation curv…
The role of large-scale magnetic fields in galaxy NGC 891. Can magnetic fields help to reduce the local mass-to-light ratio in the galactic outskirts?
Joanna Jałocha, Łukasz Bratek, Jan Pȩkala +1
We address the problem of the influence of large-scale magnetic fields on galactic rotation for the example of the spiral galaxy NGC 891. Based on its rotation curve and the surfac…
A lower bound on the Milky Way mass from general phase-space distribution function models
Łukasz Bratek, Szymon Sikora, Joanna Jałocha +1
We model the phase-space of the kinematic tracers using general, smooth distribution functions to derive a conservative lower bound on the total mass within 150-200 kpc. By approxi…
Gravitational microlensing as a test of a finite-width disk model of the Galaxy
Szymon Sikora, Łukasz Bratek, Joanna Jałocha +1
The aim of this work is to show, in the framework of a simple finite-width disk model, that the amount of mass seen through gravitational microlensing measurements in the region $0…
Vertical gradients of azimuthal velocity in a global thin disk model of spiral galaxies NGC 2403, NGC 4559, NGC 4302 and NGC 5775
Joanna Jałocha, Łukasz Bratek, Marek Kutschera +1
We estimate the vertical gradient of rotational velocity for several spiral galaxies in the framework of a global thin-disc model, using the approximation of quasi-circular orbits.…
Transverse gradients of azimuthal velocity in a global disk model of the Milky Way
Joanna Jałocha, Łukasz Bratek, Marek Kutschera +1
In this paper, we aim to estimate the vertical gradients in the rotational velocity of the Galaxy. This is carried out in the framework of a global thin disc model approximation. T…