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Polar ring galaxies as tests of gravity

F Lüghausen, B Famaey, P Kroupa, G Angus, F Combes, Gianfranco Gentile, O Tiret and H Zhao (2013) MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 432(4). p.2846-2853
abstract
Polar ring galaxies are ideal objects with which to study the three-dimensional shapes of galactic gravitational potentials since two rotation curves can be measured in two perpendicular planes. Observational studies have uncovered systematically larger rotation velocities in the extended polar rings than in the associated host galaxies. In the dark matter context, this can only be explained through dark haloes that are systematically flattened along the polar rings. Here, we point out that these objects can also be used as very effective tests of gravity theories, such as those based on Milgromian dynamics (also known as Modified Newtonian Dynamics or MOND). We run a set of polar ring models using both Milgromian and Newtonian dynamics to predict the expected shapes of the rotation curves in both planes, varying the total mass of the system, the mass of the ring with respect to the host and the size of the hole at the centre of the ring. We find that Milgromian dynamics not only naturally leads to rotation velocities being typically higher in the extended polar rings than in the hosts, as would be the case in Newtonian dynamics without dark matter, but that it also gets the shape and amplitude of velocities correct. Milgromian dynamics thus adequately explains this particular property of polar ring galaxies.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
galaxies: general, gravitation, galaxies: individual: NGC 4650A, galaxies: kinematics and dynamics, dark matter, MODIFIED NEWTONIAN DYNAMICS, DARK-MATTER, NGC 4650A, DISK GALAXIES, HALO, MOND, MASS, KINEMATICS, COSMOLOGY, EVOLUTION
journal title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Mon. Not. Roy. Astron. Soc.
volume
432
issue
4
pages
2846 - 2853
Web of Science type
Article
Web of Science id
000321053500020
JCR category
ASTRONOMY & ASTROPHYSICS
JCR impact factor
5.226 (2013)
JCR rank
11/59 (2013)
JCR quartile
1 (2013)
ISSN
0035-8711
DOI
10.1093/mnras/stt639
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
4092269
handle
http://hdl.handle.net/1854/LU-4092269
date created
2013-07-01 10:37:15
date last changed
2018-06-22 08:55:09
@article{4092269,
  abstract     = {Polar ring galaxies are ideal objects with which to study the three-dimensional shapes of galactic gravitational potentials since two rotation curves can be measured in two perpendicular planes. Observational studies have uncovered systematically larger rotation velocities in the extended polar rings than in the associated host galaxies. In the dark matter context, this can only be explained through dark haloes that are systematically flattened along the polar rings. Here, we point out that these objects can also be used as very effective tests of gravity theories, such as those based on Milgromian dynamics (also known as Modified Newtonian Dynamics or MOND). We run a set of polar ring models using both Milgromian and Newtonian dynamics to predict the expected shapes of the rotation curves in both planes, varying the total mass of the system, the mass of the ring with respect to the host and the size of the hole at the centre of the ring. We find that Milgromian dynamics not only naturally leads to rotation velocities being typically higher in the extended polar rings than in the hosts, as would be the case in Newtonian dynamics without dark matter, but that it also gets the shape and amplitude of velocities correct. Milgromian dynamics thus adequately explains this particular property of polar ring galaxies.},
  author       = {L{\"u}ghausen, F and Famaey, B and Kroupa, P and Angus, G and Combes, F and Gentile, Gianfranco and Tiret, O and Zhao, H},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keyword      = {galaxies: general,gravitation,galaxies: individual: NGC 4650A,galaxies: kinematics and dynamics,dark matter,MODIFIED NEWTONIAN DYNAMICS,DARK-MATTER,NGC 4650A,DISK GALAXIES,HALO,MOND,MASS,KINEMATICS,COSMOLOGY,EVOLUTION},
  language     = {eng},
  number       = {4},
  pages        = {2846--2853},
  title        = {Polar ring galaxies as tests of gravity},
  url          = {http://dx.doi.org/10.1093/mnras/stt639},
  volume       = {432},
  year         = {2013},
}

Chicago
Lüghausen, F, B Famaey, P Kroupa, G Angus, F Combes, Gianfranco Gentile, O Tiret, and H Zhao. 2013. “Polar Ring Galaxies as Tests of Gravity.” Monthly Notices of the Royal Astronomical Society 432 (4): 2846–2853.
APA
Lüghausen, F., Famaey, B., Kroupa, P., Angus, G., Combes, F., Gentile, G., Tiret, O., et al. (2013). Polar ring galaxies as tests of gravity. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 432(4), 2846–2853.
Vancouver
1.
Lüghausen F, Famaey B, Kroupa P, Angus G, Combes F, Gentile G, et al. Polar ring galaxies as tests of gravity. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2013;432(4):2846–53.
MLA
Lüghausen, F, B Famaey, P Kroupa, et al. “Polar Ring Galaxies as Tests of Gravity.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 432.4 (2013): 2846–2853. Print.