To be or not to be oblate: the shape of the dark matter halo in the polar ring galaxies

@article{Khoperskov2014ToBO,
  title={To be or not to be oblate: the shape of the dark matter halo in the polar ring galaxies},
  author={Sergei Khoperskov and Alexei V. Moiseev and Alexander V. Khoperskov and Anna S Saburova},
  journal={arXiv: Astrophysics of Galaxies},
  year={2014}
}
With the aim to determine the spatial distribution of the dark matter halo, we investigate two polar ring galaxies NGC 4262 and SPRC-7. For both galaxies the stellar kinematics data for the central galaxy were obtained from optical spectroscopy at the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. The information about polar gaseous components was taken from the optical 3D-spectroscopic observations of ionized gas (for SPRC-7) and H {\sc i} radio… 
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References

SHOWING 1-10 OF 88 REFERENCES
The shape of the dark halo in polar-ring galaxies
Photometric and kinematic observations of the polar-ring galaxies NGC 4650A and ESO 415-G26 are presented. The inner component of each system is an S0 galaxy, as was previously found in the case of
Chemical abundances in the polar disk of NGC 4650A: implications for cold accretion scenario
The aim of the present study is to test whether the cold accretion of gas through a 'cosmic filament' is a possible formation scenario for the polar disk galaxy NGC 4650A. If polar disks form from
Warped polar ring in the Arp 212 galaxy
The Fabry-Perot scanning interferometer mounted on the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences is used to study the distribution and kinematics of
Constraints on the shapes of galaxy dark matter haloes from weak gravitational lensing
We study the shapes of galaxy dark matter haloes by measuring the anisotropy of the weak gravitational lensing signal around galaxies in the second Red-sequence Cluster Survey (RCS2). We determine
Are polar rings indeed polar?
We have considered polar ring galaxy candidates, the images of which can be found in the SDSS survey. The sample of 78 galaxies includes the most reliable candidates from the SPRC and PRC catalogs,
On the nature of the apparent ring galaxy SDSS J075234.33+292049.8
We show that an object classified as a galaxy in on-line data bases and revealed on sky survey images as a distant ring galaxy is a rare case of polar ring galaxy (PRG) where the ring is only
The Flattened Dark Halo of Polar Ring Galaxy NGC 4650A: A Conspiracy of Shapes?
Kinematics and photometry of the polar ring galaxy NGC 4650A, including new observations of the rotation and velocity dispersion of its central stellar disk, are used to infer the presence of a dark
NGC 4262: a Virgo galaxy with an extended ultraviolet ring
Context. The Galaxy Ultraviolet Explorer (GALEX) satellite has recently shown the presence of an extended, outer ring studded with UV-bright knots surrounding the lenticular galaxy NGC 4262. Such a
Molecular content of polar-ring galaxies
We have searched for CO lines in a sample of 21 new morphologically determined polar-ring galaxies (of which nine are kinematically confirmed), obtained from a wide search in the Galaxy Zoo proj ect
Extended rotation curves of spiral galaxies: dark haloes and modified dynamics
Strict criteria are applied to the sample of spiral galaxies with measured rotation curves in order to select those objects for which the observed rotation curve is an accurate tracer of the radial
...
...