Disk Galaxies


Flat and round galaxies





  The Andromeda Galaxy (M31)


  M31: Full resolution
  M31 with different exposure times
  Figure caption

  M31 compared to the full moon


  Figure caption





  NGC 4565, a disk viewed edge-on


  Figure caption





  M74, a disk viewed face-on


  Full resolution figure
  Figure caption



Spiral Arms




  M51, the Whirlpool Galaxy,
  a clearly designed spiral


  Center of M51 (HST)
  M51: optical and CO side by side
  M51: optical and CO contours superimposed
  Figure caption



  M100


  M100: Full resolution
  Figure caption




  NGC 3370


  NGC 3370: Full resolution
  Figure caption



  M101 composite HST image


  Zoomable picture of M101
  Figure caption





  NGC 4622


  Figure caption





  NGC 1288


  Figure caption





  NGC 2613


  Figure caption





  NGC 4013: an edge-on galaxy


  Figure caption





  NGC 4414: how many arms?


  Figure caption





  M64 with dust


  Figure caption





 M33 (NGC 598) The Triangulum Galaxy


  Figure caption





  NGC 253: a flocculent spiral


  Figure caption



Barred Spiral Galaxies




  NGC 1232


  Center of NGC 1232
  Figure caption

  M109


  Figure caption




  NGC 4303 (M61),
  comparable to the Milky Way


  NGC 4303: Full resolution
  Figure caption





  M91


  M91: Full resolution
  Figure caption





  NGC 1365



  Figure caption




  M83


  Figure caption





  NGC 1300 (ground-based)


  NGC 1300: Full resolution
  Figure caption





  NGC 1300 (HST)


  NGC 1300 (HST): Full resolution
  Zoomable picture of NGC 1300
  Figure caption




  NGC 613 (VLT)


  Fiigure caption




  The Milky Way is also barred


  Figure caption




  Our Milky Way: an artist impression


  Figure caption




  Our Milky Way: spiral arms location


  Figure caption




Galaxy Classification







 The Hubble classification


  Figure caption



 NGC 5866: a lenticlular (S0) galaxy


  Figure caption
  Zoomable image



 The Sombrero Galaxy, a dusty disk
  with an unusual large central bulge


  VLT image
  VLT image (detail)
  Figure caption








The Density Wave Theory


 


  Figure caption

 


  Figure caption

 


  Figure caption
  Spiral arms and Density Waves

 


  Figure caption





N-body simulations





  Milky Way model (R. Fux)


  Movie caption

  Gas flows (R. Fux)


  Movie caption






background photo: Barred Spiral Galaxy NGC 1300 (Credit: NASA, ESA, and The Hubble Heritage Team)
http://hubblesite.org/newscenter/archive/releases/2005/01/image/a/