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Galactic Astronomy

 Reginald_Dufour  hartigan   johnskrull
    Reginald J. Dufour
  Professor
  Patrick Hartigan
Professor
Christopher M. Johns-Krull
Assistant Professor


Research Highlights of Galactic Astronomy Faculty

See also the High Energy Astrophysics page for related research

Reginald Dufour

Hubble Space Telescope imagery and modeling of photoionized nebulae  
Spitzer IR telescope studies of the spatial variation of molecular hydrogen, PAHs, 
  and ionic states of neon and sulphur in the ISM of nearby galaxies
CNONeS element abundances in the ISM of galaxies and galactic chemical evolution

Patrick Hartigan

Hubble Space Telescope and ground-based observations and models of shock waves 
  in stellar jets and outflows
 
Laboratory laser experiments, numerical models, and astronomical observations of 3-D 
  supersonic fluid dynamics in jets
Accretion and Wind Flows Around Young Stars

Chris Johns-Krull

Magnetic fields and stellar activity
Extra-solar planet and brown dwarf searches
Accretion and wind flows around young stars

hh30sm  


A spectral image of the collimated stellar jet HH 30 taken through a wide slit with the STIS spectrograph on the Hubble Space Telescope. The image shows that the jet is visible very close to the star (position denoted by a horizontal white line) in both emission lines of singly-ionized sulphur. These images make it possible to learn about physical conditions such as the density, ionization fraction, and temperature, and allow us to measure how the jet becomes collimated as it emerges from the accretion disk that drives the outflow from this young star

 m51sm  


The Whirlpool galaxy as imaged by the Spitzer Space Telescope.  The background image is the 3 color image taken with the Spitzer Infrared Array Camera (IRAC).  The orange strip across the nucleus and disk of the galaxy is a map of H2 S(2) emission.  The H2 S(2) line was mapped using the Spitzer Infrared Spectrograph (IRS) 

 

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