“Magnets in Space” Alyssa A. Goodman Harvard-Smithsonian Center for Astrophysics.

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Presentation transcript:

“Magnets in Space” Alyssa A. Goodman Harvard-Smithsonian Center for Astrophysics

Magnetic Field Lines

Our Sun

Magnetic Fields Dancing on the Sun Images from NASA’s “TRACE” Satellite

Earthlings Saved by Magnetic Fields!* *but not the poor (surface) Martians, or Venusians!

Earthlings Saved by Magnetic Fields!* Aurora Borealis

A Star-Forming Region

The Old(er), The Young & the Unborn

Molecular or Dark Clouds "Cores" and Outflows Star and Planet Formation Jets and Disks Solar System Formation 1 pc = 3 lyr

Outflows Magnetohydrodynamic Waves Thermal Motions MHD Turbulence Infall SNe/GRB H II Regions What magnetic fields have to do with this whole picture?

Magnetic Fields in Star Forming Gas Stone, Gammie & Ostriker 1999 Driven Turbulence; M  K; no gravity Colors: log density Computational volume: Dark blue lines: B-field Red : isosurface of passive contaminant after saturation  =0.01  =1  T /10 K  n H 2 /100 cm -3  B /1.4  G  2

Star Formation the Easy Way (that doesn’t work) Global Instability (e.g. Jeans) Fragments Cloud (hierarchically) time~10 6 years Hoyle 1953 Fragments Collapse Under Gravity into “Protostars” time~10 5 years

Ta-Da A Group of Young “Zero-Age Main Sequence” Stars is Born

The (Beautiful) Ugly Truth

The History of the Universe

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