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Thread: Combining rotation curves and lensing

  1. #1
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    Combining rotation curves and lensing

    That is what I was looking for for a long time:
    https://arxiv.org/pdf/1006.4875.pdf

    Apparently combining rotation curves and lensing gives different DM halos. This can't be a crackpottery, am I right?


    Regards,
    philippeb8

  2. #2
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    Quote Originally Posted by philippeb8 View Post
    That is what I was looking for for a long time:
    https://arxiv.org/pdf/1006.4875.pdf

    Apparently combining rotation curves and lensing gives different DM halos. This can't be a crackpottery, am I right?
    That isn't what the paper says at all.

    What the paper actually says is that there are two possible models for DM halos and that they are indistinguishable using just rotation curves. However they have shown theoretically that by combining measurements from lensing and rotation curves you can work out which model fits the data better and get better estimates for the halo parameters.

  3. #3
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    Quote Originally Posted by philippeb8 View Post
    That is what I was looking for for a long time:
    https://arxiv.org/pdf/1006.4875.pdf

    Apparently combining rotation curves and lensing gives different DM halos. This can't be a crackpottery, am I right?


    Regards,
    philippeb8
    Philippe, I find that this is a very dubious paper. I see no indication that it has bee peer reviewed or published elewhere or referenced. And, it is seven years old.

    Lot of luck.
    Last edited by John Mendenhall; 2017-Mar-20 at 09:40 PM. Reason: typo

  4. #4
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    Quote Originally Posted by John Mendenhall View Post
    Philippe, I find that this is a very dubious paper. I see no indication that it has bee peer reviewed or published elewhere or referenced. And, it is seven years old.

    Lot of luck.
    Wiki's article on arXiv is here:

    https://en.wikipedia.org/wiki/ArXiv

  5. #5
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    Quote Originally Posted by Shaula View Post
    That isn't what the paper says at all.

    What the paper actually says is that there are two possible models for DM halos and that they are indistinguishable using just rotation curves. However they have shown theoretically that by combining measurements from lensing and rotation curves you can work out which model fits the data better and get better estimates for the halo parameters.
    Ok thanks for the clarifications Shaula.

    I can't find what I am looking for so this means the research isn't done yet.

  6. #6
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    Quote Originally Posted by John Mendenhall View Post
    Philippe, I find that this is a very dubious paper. I see no indication that it has bee peer reviewed or published elewhere or referenced. And, it is seven years old.

    Lot of luck.
    I was pointing this article out because it received a grant and UC Berkeley was part of the research.

  7. #7
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    Quote Originally Posted by philippeb8 View Post
    Ok thanks for the clarifications Shaula.

    I can't find what I am looking for so this means the research isn't done yet.
    Opportunity knocks.

    Good luck.

  8. #8
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    Quote Originally Posted by John Mendenhall View Post
    Opportunity knocks.

    Good luck.
    Everything is under control despite the only equipment I possess is the laptop ("magic mirror") in my lab

  9. #9
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    Quote Originally Posted by philippeb8 View Post
    I was pointing this article out because it received a grant and UC Berkeley was part of the research.
    Neither or which means that it will be a good/correct paper, I sometimes review papers from grants from good universities and they turn out to be total rubbish.

    However, I did find that the paper HAS been published in Physical Review D in 2010.
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    Quote Originally Posted by John Mendenhall View Post
    Wiki's article on arXiv is here:

    https://en.wikipedia.org/wiki/ArXiv
    Please stop the side discussion about arXiv
    At night the stars put on a show for free (Carole King)

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  11. #11
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    Quote Originally Posted by tusenfem View Post
    Neither or which means that it will be a good/correct paper, I sometimes review papers from grants from good universities and they turn out to be total rubbish.

    However, I did find that the paper HAS been published in Physical Review D in 2010.
    Good to know... thanks.

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    I think this is what I am looking for, which seems to be a well known problem:
    https://en.wikipedia.org/wiki/Cuspy_halo_problem

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    Yes, the cuspy halo problem is a well known problem with the listed potential solutions.

  14. #14
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    Quote Originally Posted by Reality Check View Post
    Yes, the cuspy halo problem is a well known problem with the listed potential solutions.
    Ok thank you for the confirmation.

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