× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
New Topic  
ppk ppk
wrote...
Valued Member
On Hiatus
Posts: 3561
12 years ago
Why can the Tully-Fisher relation be used at greater distances than Cepheids? 
Read 1032 times
1 Reply

Related Topics

Replies
wrote...
12 years ago
We must image the individual star and follow its light curve for the period-luminosity relation of Cepheids, but the Tully-Fisher relation depends on the light of the galaxy having its spectral lines broadened by the galaxy's spin; this can be detected from far larger distances than single star images can. 
~Live well, laugh often, and love with all of your heart!~
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1302 People Browsing
Related Images
  
 279
  
 417
  
 830