Document Type : Research Paper
Author
Anbar University - College of Science
Abstract
Tully – Fisher relation is a tool to study mass – luminosity relation for all galaxies
and other properties , the spiral galaxies was studied by this relation can use as standard candle to
measure the distance for far and fast objects that turn aside from Hubble line. But somebody make
doupt about this relation for far than 200Mph and high velocities because the hardly widening of the
21 cm line from HI atom , so we use the LEDA web site , that having more than 3 million objects
with its data, to prove the correct of this relation even for the more distance by finding the little
standard devation , slope and other veraibles that deal with mass and luminosity
Keywords
- LEDA, http:// leda.univ-lyon 1.fr ( general LEDA information )
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