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Thread: spindle galaxies

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    Default spindle galaxies



    EPs: KK "Fujiyama" Orthoscopics; Baader Classic Orthos (2x); Vixen NPLs 40-6mm (2x); Pseudo Masuyamas (Takahashi, Kasai, Parks, Orion) 50-5mm; TV Panoptics; TV Delos 17.3-8mm; TV Plössls 32-8mm; ES100 20, 14, 9mm; Meade HD-60 25mm; Vixen LV Zoom 8-24mm; Baader Mk IV Zoom 8-24mm (2x); Gary Russell 65mm Plossl; GSO WF 50, 30mm; random Kellners.
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    Default Re: spindle galaxies

    Thanks for posting this. I shall eagerly await the Chilean MUSEings on it.
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    Default Re: spindle galaxies

    It's an interesting instrument. It provides complete spectra throughout the visual frequencies.

    https://en.wikipedia.org/wiki/Multi_...copic_Explorer

    The resolution is high enough to provide radial velocity measures for all the stars at typical galaxy rotation speeds. Nice!
    EPs: KK "Fujiyama" Orthoscopics; Baader Classic Orthos (2x); Vixen NPLs 40-6mm (2x); Pseudo Masuyamas (Takahashi, Kasai, Parks, Orion) 50-5mm; TV Panoptics; TV Delos 17.3-8mm; TV Plössls 32-8mm; ES100 20, 14, 9mm; Meade HD-60 25mm; Vixen LV Zoom 8-24mm; Baader Mk IV Zoom 8-24mm (2x); Gary Russell 65mm Plossl; GSO WF 50, 30mm; random Kellners.
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    Default Re: spindle galaxies

    Quote Originally Posted by not_Fritz_Argelander View Post
    It's an interesting instrument. It provides complete spectra throughout the visual frequencies.

    https://en.wikipedia.org/wiki/Multi_...copic_Explorer

    The resolution is high enough to provide radial velocity measures for all the stars at typical galaxy rotation speeds. Nice!
    What amazes me is some of the measurements that were able to make long ago, like back in the 30's to find evidence for dark matter. It's hard to imagine they were able to make such precise measurements back then to not only gauge galaxies were in motion, but how they were moving. I'm sure they had to use something more than just a set of calipers to measure those changes over such a short period of time (on a universal scale, anyway). What would they have accomplished then with the tools we have today. What will they find tomorrow?

    I love reading this stuff. I don't always understand it all, and I'm sure I'll never be a cosmologist, but I enjoy learning of it.
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    Default Re: spindle galaxies

    Zwicky's original measurements were radial velocity measurements and he applied a result called the Virial Theorem that relates the total kinetic and gravitational potential energies. So higher dispersion of radial velocities implies a larger mass, just as a higher mass star in equilibrium must have a higher internal temperature. What I find remarkable is that his result has been so robust. It has held up very well and even through huge revisions of the cosmic distance scale.
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