FUNA Lunch Talk:

Julie Wardlow

Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen

A far-infrared view of high-redshift star-formation

August 8

12:10PM, Room 230, NRAO, Edgemont Road


Over the past ~15 years the high redshift Universe has been increasingly opened to scrutiny at far infrared wavelengths, where dust reprocessed emission from star formation dominates. The bright, so-called submillimeter galaxies (SMGs), selected at these wavelengths are among the most prolific star-forming galaxies at z~2. However, their redshifts, coupled with the vast quantities of dust that they contain make them faint and difficult to detect at shorter wavelengths. We are now using wide field Herschel surveys to identify strongly gravitationally lensed galaxies, and taking advantage of the lensing amplification to study both SMGs and less active dusty galaxies in high resolution in follow-up data. I will describe the straightforward and robust selection technique and present data from our extensive multiwavelength follow-up observations, showing how the lensed galaxies are used to probe the details of dusty star-formation at z~2 to 3. I will finish with a short discussion of how far-infrared data can also be an asset when examining less active high-redshift galaxy populations, using Lyman-alpha emitters at z~3 to 5 as an example.