Guest Cosmologist in the House: Roger Blandford

• oversaw the 2010 Decadal Survery of Astronomy and Astrophysics
• will speak on the Accelerating Universe, i.e., particles like this

Spiral Dynamics and Dark Matter

• Rotation curves
  • the pioneer: Vera Rubin
  • geometry of the problem
  • M31: optical, with 21-cm rotation curve from Carignan et al (2006)
  • M33 rotation curve
  • NGC 2997: optical global and zoom (sources here and here); hot off the slit spectrograph
  • typical rotation curves examples, by galaxy type
• Global velocity profiles:
  21-cm data
  the Tully-Fisher relation (Tully & Fisher (1977))

Spiral Structure

• Spiral arms
  
  • Milky Way: H I gas (21 cm), stars (near IR) (source here)
  • grand design: M74 visible, UV, near-IR H-alpha; NGC 2997 visible (sources here, here, here)
  • flocculent: NGC 4414, source here
  • multiwavelength Andromeda (M31) NGC 1512, M81, M104,
• Leading vs trailing arms
• The winding problem
• The Lin-Shu hypothesis (Lin & Shu 1964)
  Spiral density waves
  spiral pattern from nonradial (oval) orbits

Elliptical Galaxies

• Photometry
  lineup:
  • E1: M105
  • E3: NGC 4365, zoom
  • E6: NGC 3377
• Stellar dynamics
  • stellar orbit: awesome applet
  • rotation
  • Faber-Jackson relation (Faber & Jackson (1976))
  • orbit families
  • dark matter
• Dark matter
• Interstellar medium
  • hot gas: NGC 720, NGC 4649
  • dust