Kathryn Kreckel (MPIA Heidelberg)

The ISM in Nearby Galaxies: An Optical IFU Perspective
Wann Am 05.10.2016 von 11:00 bis 12:00
Was
  • Special Seminar
  • Kolloquium
Wo SH, Hörsaal
Termin übernehmen vCal / iCal

To understand how galaxies evolve we must understand the physical processes in the interstellar medium (ISM) that regulate their evolution.  Optical integral field spectroscopy allows us to characterize and map the ionized ISM within nearby galaxies, giving us unique insights into the physics of dust, star formation and feedback at the relevant spatial scales (~100pc).  Using a new PMAS/PPAK survey of nearby galaxies (FISHPPAK), I will compare with Herschel SED modeling from KINGFISH to trace both the far-IR emission and optical absorption by interstellar dust and place constraints on the dust distribution and geometry.  Applying these insights to star formation studies, I present our deep VLT/MUSE mosaic of the nearby grand design spiral galaxy NGC 628.  Here we can resolve and fully characterize the physical properties of 428 arm and interarm HII regions, and determine that diffuse ionized gas (DIG)  contamination (traced via the temperature sensitive [SII]/Halpha line ratio) can result in significant (70%) changes to the star formation rate measured. Preliminary results comparing well-corrected star formation rates to ALMA CO(2-1) molecular gas observations at 1"=50pc resolution trace the Kennicutt-Schmidt star formation law at the scales relevant to the physics of star formation. Finally, combined optical and far-IR IFU observations reveal how stellar feedback in NGC 2146 launches a starburst driven galactic wind out to 2.5 kpc above the galaxy disk, with energetics and kinematics that will clearly impact the evolutionary future of the system.  In total, by exploiting optical IFU data we trace the full cycling of material through the ISM.