Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (334) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Estimating the masses of galaxy groups - Alternatives to the virial theorem
Authors:
Heisler, J.; Tremaine, S.; Bahcall, J. N.
Affiliation:
AA(MIT, Cambridge, MA), AB(MIT, Cambridge, MA), AC(Institute for Advanced Study, Princeton, NJ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 298, Nov. 1, 1985, p. 8-17. (ApJ Homepage)
Publication Date:
11/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Models, Galactic Clusters, Mass, Virial Theorem, Many Body Problem, Monte Carlo Method
DOI:
10.1086/163584
Bibliographic Code:
1985ApJ...298....8H

Abstract

The authors present three alternatives to the virial theorem for estimating the masses of groups of galaxies. The projected mass estimator uses the mean value of Vi2|Ri|, where Vi and Riare the radial velocity and projected separation of galaxy i from the group center. The other two methods rely on the average and median of (Vi-Vj)2|Ri-Rj| over all pairs of galaxies in the group. These three estimators and the virial theorem estimator are tested using a series of N-body simulations and Monte Carlo realizations of Michie models. The authors use the mass estimators to calculate the masses and mass-to-light ratios of nearby groups catalogued by Huchra and Geller. The results confirm their work, implying that there is a large amount of dark mass in groups on scales of ≡700 kpc.

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