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(Galactic) disc scalelength

  1. Jan 25, 2015 #1

    PCB

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    Can anyone please give m the definition of disc scalelength?
     
  2. jcsd
  3. Jan 25, 2015 #2

    davenn

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    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
     
  4. Jan 25, 2015 #3

    PCB

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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.
     
  5. Jan 25, 2015 #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
     
  6. Jan 26, 2015 #5

    PCB

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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.
     
  7. Jan 26, 2015 #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
     
  8. Jan 26, 2015 #7

    PCB

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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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