[POSTPONED DUE TO COVID-19] Star-forming Clumps in Local Luminous Infrared Galaxies

Kirsten Larson (Caltech)
Friday, March 13, 2020 - 12:15pm to 1:00pm

Local luminous infrared galaxies (LIRGS) are a mixture of single disk galaxies, interacting systems, and advanced mergers, exhibiting enhanced star formation rates and AGN activity. This makes them an ideal laboratory of studying resolved star formation in the local Universe. A number of studies have found that high redshift star forming galaxies tend to have turbulent, clumpy disks with extreme star forming clumps that are not seen in normal local galaxies.  I will present the results from our HST narrow-band Paα and Paβ imaging study of 48 local LIRGs from the Great Observatories All-Sky LIRG Survey (GOALS). These data allow us to measure the star formation rates, sizes, ages, and masses of 810 spatially resolved star-forming regions, and directly compare their properties to those found in both local and high-redshift star-forming galaxies. I will show how the star formation rates of the clumps in local LIRGs nicely span the range of star formation rates found in normal local star forming galaxies to the clumps found in high-redshift star forming galaxies at z = 1–3. By comparing star formation in LIRGs to normal low redshift galaxies, high redshift galaxies, and sophisticated hydrodynamical simulations, we can better understand how global galaxy properties and environment influence star formation on smaller scales.

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