(Galactic) disc scalelength

  • #1
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Can anyone please give m the definition of disc scalelength?
 

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  • #2
davenn
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..... disc scalelength
I assumed you typo'ed and there should be a gap between scale and length

there are a number of answers to that on google :)

come back if you have any specific question in what you read

Dave
 
  • #3
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thanks, I have googled the term and I have found numerous uses of the term, but no definition. If you can help I would very much appreciate it.
 
  • #4
davenn
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from ..... http://arxiv.org/pdf/1004.1507.pdf -

Scale length of disc galaxies

comes -----

The scale length determines how the stars are distributed throughout a disk, and can be used to derive its mass distribution,
assuming a specific M/L ratio. Ultimately, this mass distribution is the primary constraint for determining the formation scenario


there are others

Dave
 
  • #5
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Thanks, that is helpful, but I was looking for a detailed definition so I could understand what, for instance, 2.5 scale lengths meant in a particular situation.
 
  • #6
davenn
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from what I read in a couple of papers whilst doing that searching for you
is that you are not going to get a better definition. It is something that is a little vague and varies between researchers


sorry
that's about the best I can do or find

Dave
 
  • #7
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Thanks very much, your efforts are much appreciated. I cannot help but feel that a term used as much as it is in many formal papers is not well defined, and/or that definition is not easy to find--in this information age.
 

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