Papers by Andreas Kalakallas
We present a Herschel /SPIRE survey of three protoclusters at z = 2 − 3 (2QZCluster, HS1700, SSA2... more We present a Herschel /SPIRE survey of three protoclusters at z = 2 − 3 (2QZCluster, HS1700, SSA22). Based on the SPIRE colours (S 350 /S 250 and S 500 /S 350) of 250 µm sources, we selected high redshift dusty star-forming galaxies potentially associated with the protoclusters. In the 2QZCluster field, we found a 4σ overdensity of six SPIRE sources around 4.5 ′ (∼ 2.2 Mpc) from a density peak of Hα emitters at z = 2.2. In the HS1700 field, we found a 5σ overdensity of eight SPIRE sources around 2.1 ′ (∼ 1.0 Mpc) from a density peak of LBGs at z = 2.3. We did not find any significant overdensities in SSA22 field, but we found three 500 µm sources are concentrated 3 ′ (∼1.4 Mpc) east to the LAEs overdensity. If all the SPIRE sources in these three overdensities are associated with protoclusters, the inferred star-formation rate densities are 10 3 − 10 4 times higher than the average value at the same redshifts. This suggests that dusty star-formation activity could be very strongly enhanced in z ∼ 2 − 3 protoclusters. Further observations are needed to confirm the redshifts of the SPIRE sources and to investigate what processes enhance the dusty star-formation activity in z ∼ 2 − 3 protoclusters.
by Defensive Architecture, Andreas Kalakallas, Paschalis Androudis, ΜΙΧΑΛΗΣ ΚΑΠΠΑΣ, Martine BREUILLOT, Katerina A Manoussou-Ntella, Maria Arakadaki, Stavros Arvanitopoulos, Thanos Kondylis, Andreas kal, and Demetris Athanasoulis
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Papers by Andreas Kalakallas