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: http://www.sao.ru/fetch/HL/leda/param/mod0.html
Дата изменения: Mon Dec 23 18:23:59 2013 Дата индексирования: Fri Feb 28 17:11:57 2014 Кодировка: Поисковые слова: equinox |
When measurements are available in the distance catalogue, mod0 is computed as the weighted average of those measurements. Otherwise, it is determined either using the Tully-Fisher or Faber-Jackson relation for respectively spiral or elliptical galaxies.
The Tully-Fisher relation uses the corrected total magnitude
btc
and the maximum velocity of rotation vmaxg.
mod0 = btc + 6.5 log(vmaxg) + 6.3
The Faber-Jackson relation uses the corrected total magnitude
btc
and the central velocity dispersion vdis.
mod0 = btc + 6.2 vdis + 5.9
Another parameter, modz (redshift distance modulus), estimates the luminosity-distance using the redshift.
HyperLeda | Questions: leda@univ-lyon1.fr |