Deprojection of the r^1/4^ law tables Virtual Observatory Resource

Authors
  1. Young P.J.
  2. Published by
    CDS
Abstract

A spherical galaxy with reduced surface brightness, J=B({alpha})/B_e_, obeying the r^1/4^ law, logJ=-3.3307 ({alpha}^1/4^-1), where {alpha} is the reduced radius, {alpha}=r/r_e_ (r_e_ is the effective radius), is deprojected to find the corresponding space density, mass, mean density, force, potential, escape velocity, and potential energy at each point in the galaxy. Numerical tabulations to five significant figures are given for 124 points in the range 10^-6^<=R/r_e_<=260. In addition the projected surface brightness B({alpha}) and integrated luminosity within {alpha} are tabulated for the range 10^-6^<={alpha}=r/r_e_<=260. Conversion factors to cgs units and to M_{sun}_, pc, km/s, L_{sun}_ units are given. Asymptotic expansions for the space density {rho}(s) in the ranges s=<10^-4^ and s>=10^-1^ are derived, and it is demonstrated that the projection of the expansion for s<=10^-1^ is almost indistinguishable from the r^1/4^ law itself, apart from a small excess of luminosity in the central regions. Formulae and numerical tables of the luminosity distribution are given for use in galaxy photometry. Relations between the total galactic mass M_T_, the effective radius r_e_, the velocity dispersion {sigma}_v_, the central density {rho}_c_ and the mass M_N_ and radius R_N_ of the nucleus are derived. Here the "nucleus" is defined as the region within which stars having a velocity equal to the mean velocity dispersion in space, {sigma}_v_.

Keywords
  1. Astronomical models
  2. Galaxies
  3. Photometry
  4. Surface photometry
Bibliographic source Bibcode
1976AJ.....81..807Y
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/81/807
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/81/807
Document Object Identifer DOI
doi:10.26093/cds/vizier.50810807

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/81/807
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/81/807
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/81/807
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).

History

2000-06-18T22:14:52Z
Resource record created
2000-06-18T22:14:52Z
Created
2000-06-18T22:16:35Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr