Sign on
ADS Classic will be deprecated in May 2019 and retired in October 2019. Please redirect your searches to the new ADS modern form or the classic form. More info can be found on our blog.

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· arXiv e-print (arXiv:astro-ph/9406015)
· References in the article
· Citations to the Article (148) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (6)
· NED Objects (1)
· Also-Read Articles (Reads History)
· HEP/Spires Information
·
· Translate This Page
Title:
The flattened dark halo of polar ring galaxy NGC 4650A: A conspiracy of shapes?
Authors:
Sackett, Penny D.; Rix, Hans-Walter; Jarvis, Brian J.; Freeman, Kenneth C.
Affiliation:
AA(Institute for Advanced Study, Princeton, NJ, US), AB(Institute for Advanced Study, Princeton, NJ, US), AC(European Southern Observatory, La Silla, Chile), AD(European Southern Observatory, La Silla, Chile)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 436, no. 2, p. 629-641 (ApJ Homepage)
Publication Date:
12/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Photometry, Dark Matter, Disk Galaxies, Galactic Halos, Galactic Rotation, Kinematics, Ring Galaxies, Stellar Luminosity, Astrodynamics, Galactic Mass, Mass Distribution
DOI:
10.1086/174938
Bibliographic Code:
1994ApJ...436..629S

Abstract

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 matter halo and to measure its shape. Fits to the observed disk polar ring rotation curves from detailed mass and photometric modeling rule out a spherical dark halo. The best-fit models have halos with isodensity surfaces that are flattened to a shape between E6 and E7 (axis ratios between 0.4 and 0.3); the asymptotic equatorial speeds of these models are in excellent agreement with the I-band Tully-Fisher relation. This degree of dark halo flattening is larger than that expected from N-body collapse simulations of dissipationless dark matter. Since the kinematics and surface brightness profile of the central luminous body indicate that its light has an intrinsic axis ratio c/a less than or approximately = 0.4, in NGC 4650A the radial 'conspiracy' between the dark and luminous components that leads to flat rotation curves may extend to the shape of the mass distribution as well.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences



More Article Retrieval Options

HELP for Article Retrieval


Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints