scholarly journals Dark Matter in the Polar Ring Spiral NGC 660

1995 ◽  
Vol 164 ◽  
pp. 435-435
Author(s):  
Wim Van Driel
Keyword(s):  
Dark Matter ◽  
Three Dimensional ◽  
Polar Ring ◽  
Ring Galaxies ◽  
Dimensional Distribution

Polar ring galaxies, where rotation velocities can be measured in two orthogonal planes, are generally considered to be ideal objects for studies of the three-dimensional distribution of dark matter in galaxies.

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

2014 ◽  
Vol 441 (3) ◽  
pp. 2650-2662 ◽  
Author(s):  
S. A. Khoperskov ◽  
A. V. Moiseev ◽  
A. V. Khoperskov ◽  
A. S. Saburova
Keyword(s):  
Dark Matter ◽  
Dark Matter Halo ◽  
Polar Ring ◽  
Ring Galaxies

scholarly journals Simulating the galactic system in interaction AM 2229-735 and the formation of its polar structure

2019 ◽  
Author(s):  
Luis F Quiroga ◽  
J C Muñoz-Cuartas ◽  
I Rodrigues ◽  
Noam I Libeskind
Keyword(s):  
Dark Matter ◽  
Initial Conditions ◽  
Polar Structure ◽  
Polar Ring ◽  
Galactic System ◽  
Galaxy Disk ◽  
Ring Galaxies ◽  
Tidal Stream ◽  
Minor Mergers ◽  
A Minor

Abstract We study the formation of polar ring galaxies via minor mergers. We used N-body+hydrodynamics simulations to reproduce the dynamics of the observed system AM 2229-735 that is a minor merger whose interaction signals are those of a progenitor for a polar ring galaxy. We used the observational information of the system to get initial conditions for the orbit and numerical realisations of the galaxies to run the simulations. Our simulations reproduce the global characteristics of interaction observed in the system such as arms and a material bridge connecting the galaxies. As a merger remnant, we found a quasi-stable and self gravitating planar tidal stream with dark matter, stars and gas orbiting in a plane approximately perpendicular to the main galaxy disk leading in the future to a polar ring galaxy. We studied the dynamical conditions of the polar structure and found evidence suggesting that this kind of merger remnant can settle down in a disk-like structure with isothermal support, providing inspiring evidence about the process of formation of galactic disks and providing a potentially independent scenario to study the presence of dark matter in this kind of galaxies.

9. The Outer Galactic Environment

1988 ◽  
Vol 20 (01) ◽  
pp. 396-404
Keyword(s):  
Dark Matter ◽  
Galactic Plane ◽  
Dwarf Galaxies ◽  
Single System ◽  
Narrow Strip ◽  
Polar Ring ◽  
Ring Galaxies

One of the highlights of the study of the galactic environment is the demonstration that companions and hydrogen clouds surrounding our Galaxy form a ring-like structure similar to that surrounding external polar-ring galaxies. Probably this feature is common in giant galaxies. Dwarf galaxies may possess their own dark coronas, which fact, if confirmed, puts severe constraints on the nature of dark matter. Available evidence confirms earlier suggestions that our Galaxy with its massive corona, companions, and surrounding gas forms a single system with many mutual interactions. Most companions of our Galaxy as well as the main hydrogen streams are located in a narrow strip inclined 70° to the galactic plane.

scholarly journals Distribution of Dark Matter in Polar Ring Galaxies

1987 ◽  
Vol 117 ◽  
pp. 315-315
Author(s):  
Bradley C. Whitmore ◽  
Douglas B. McElroy ◽  
François Schweizer ◽  
Vera C. Rubin
Keyword(s):  
Dark Matter ◽  
Gravitational Potential ◽  
Three Dimensions ◽  
Polar Ring ◽  
Ring Galaxies ◽  
Spherical Potential

The discovery of SO galaxies with polar rings makes it possible to directly measure the gravitational potential of a galaxy in three dimensions. Schweizer, Whitmore and Rubin (1983) find a spherical potential in the case of A0136-0801. We have observed three more polar ring galaxies using the 4 meter telescope at CTIO. The following table summarizes the results for these three systems as well as A0136-0801, and figure 1 shows an example of the data.

scholarly journals Structure and Kinematics of Polar Ring Galaxies: New Observations and Estimation of the Dark Halo Shape

2015 ◽  
Vol 24 (1) ◽  
Author(s):  
A. Moiseev ◽  
S. Khoperskov ◽  
A. Khoperskov ◽  
K. Smirnova ◽  
A. Smirnova ◽  
...  
Keyword(s):  
Dark Matter ◽  
Observational Data ◽  
Dark Matter Halo ◽  
Dark Halo ◽  
Dark Matter Halos ◽  
Ionized Gas ◽  
Polar Ring ◽  
Gas Kinematics ◽  
Open Questions ◽  
Ring Galaxies

AbstractThe polar ring galaxies (PRGs) represent an interesting type of peculiar systems in which the outer matter is rotating in the plane which is roughly perpendicular to the disk of the main galaxy. Despite the long-lasting study of the PRGs, the amount of observational data detailed enough is insufficient; there still remain many open questions. Among the most interesting issues, there are: estimating the flattening of dark matter halos in these systems and verifying the assumption that the most massive polar structures were formed by accretion of the matter from intergalactic filaments. The new catalog recently compiled by our team using SDSS images increased, by several times, the number of known PRGs. The current paper gives an overview of our latest results on the study of morphological and photometric structure of the PRGs. Using the stellar and ionized gas kinematics data based on spectroscopic observations with the Russian 6-m telescope, we estimate the shape of dark matter halo in individual galaxies.

Distribution of Dark Matter in Polar Ring Galaxies

1987 ◽  
pp. 315-315
Author(s):  
Bradley C. Whitmore ◽  
Douglas B. McElroy ◽  
François Schweizer ◽  
Vera C. Rubin
Keyword(s):  
Dark Matter ◽  
Polar Ring ◽  
Ring Galaxies

Three-dimensional distribution of ribulose-1, 5-bisphosphate carboxylase/oxygemase during the early development of proplastids in dark-grown Euglena cells transferred to an inorganic medium

1990 ◽  
Vol 48 (3) ◽  
pp. 906-907
Author(s):  
Tomoko Ehara ◽  
Shuji Sumida ◽  
Tetsuaki Osafune ◽  
Eiji Hase
Keyword(s):  
Cell Suspension ◽  
Euglena Gracilis ◽  
Carbon Materials ◽  
Three Dimensional ◽  
Peripheral Region ◽  
Plastid Development ◽  
Bisphosphate Carboxylase ◽  
Inorganic Medium ◽  
Ribulose 1 ◽  
Dimensional Distribution

As shown previously, Euglena cells grown in Hutner’s medium in the dark without agitation accumulate wax as well as paramylum, and contain proplastids showing no internal structure except for a single prothylakoid existing close to the envelope. When the cells are transferred to an inorganic medium containing ammonium salt and the cell suspension is aerated in the dark, the wax was oxidatively metabolized, providing carbon materials and energy 23 for some dark processes of plastid development. Under these conditions, pyrenoid-like structures (called “pro-pyrenoids”) are formed at the sites adjacent to the prolamel larbodies (PLB) localized in the peripheral region of the proplastid. The single prothylakoid becomes paired with a newly formed prothylakoid, and a part of the paired prothylakoids is extended, with foldings, in to the “propyrenoid”. In this study, we observed a concentration of RuBisCO in the “propyrenoid” of Euglena gracilis strain Z using immunoelectron microscopy.

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