Oral Presentation

Multi-wavelength Observations of Candidate Starbursting Protoclusters selected by Planck and Herschel

Author(s): Tai-An Cheng, David Clements, Joshua Greenslade, Joseph Cairns (Imperial College London)

Presenter: Tai-An Cheng (Imperial College London)

Crossmatching between Planck and Herschel data has revealed a number of candidate high-redshift protoclusters of starbursting galaxies. These starbursting galaxies are thought to be the progenitors of elliptical galaxies residing in today's massive galaxy clusters so their studies are important in galaxy and galaxy cluster formation models. In this talk, I am going to show the multi-wavelength observations of these candidate starbursting protoclusters and their implications. Starting from the far-infrared and submillimeter, I will show our Herschel/SPIRE and SCUBA-2 studies of 13 of our protocluster candidates, such as number counts and photometric redshifts. We also have observations in the radio using VLA and ATCA and both show high-resolution images of possible mergers or AGNs in these fields. In the optical/near-infrared, we have obtained data from the 4.2-m William Herschel Telescope (WHT) which shows faint high-redshift sources and peaks in the photometric redshift estimates. In millimeter, I will show spectroscopy results using IRAM's 30-m Telescope, which shows CO lines of our protocluster dusty star-forming galaxies. Combining archival data such as Spitzer/IRAC we therefore have a panchromatic view of these early-forming galaxy clusters near the peak of the cosmic star-formation rate density at z~2.