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M101 – the Wonder Galaxy

M101 – the Wonder Galaxy. Karl D. Gordon, STScI, 29 Jan 2009, IYA09. Why M101. M101 = Pinwheel Galaxy Large, bright, and face-on Apparent size is >0.5 degrees 2x larger than the Milky Way Not inclined Lots of star formation Very weak bulge Large metallicity gradient

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M101 – the Wonder Galaxy

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  1. M101 – the Wonder Galaxy Karl D. Gordon, STScI, 29 Jan 2009, IYA09

  2. Why M101 M101 = Pinwheel Galaxy Large, bright, and face-on Apparent size is >0.5 degrees 2x larger than the Milky Way Not inclined Lots of star formation Very weak bulge Large metallicity gradient Strong change in metals (> He) with radius

  3. Optical Stars Young (blue) Old (red) Gas Emission lines (not shown) Dust (obscuration)

  4. Infrared Stars Old (blue) Dust Aromatics (Organics) (green) Hot Dust Star formation (red)

  5. X-ray Point-sources X-ray binaries (black holes/ neutron stars) Supernovae remnants Extended Emission Stellar clusters Hot gas

  6. Other Views of M101 Very popular galaxy Observed with other NASA space mission And ground based observatories A clear view of star formation from: GALEX – ultraviolet Radio – 21cm HI line Spitzer - infrared

  7. Ultraviolet Hot Young Stars (unobscured) Dust (obscuration) Dust scattered light GALEX far-UV (0.15 micron)

  8. Infrared Hot Young Stars (obscured) Hot Dust Emission Spitzer/MIPS (24 micron)

  9. Radio 21cm emission line Atomic hydrogen Fuel for stars Ground-based Very Large Array

  10. Star Formation Fuel (green) Unobscured (blue) Obscured (red)

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