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The average FIR SED of proto-clusters at z = 4

Published online by Cambridge University Press:  10 June 2020

Mariko Kubo ,
Jun Toshikawa ,
Nobunari Kashikawa ,
Hisakazu Uchiyama  and
Kei Ito
Mariko Kubo
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo181-8588, Japan
Jun Toshikawa
Affiliation:
Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan
Nobunari Kashikawa
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo181-8588, Japan Department of Astronomy, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, JAPAN, 113-0033 email: mariko.kubo@nao.ac.jp
Hisakazu Uchiyama
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo181-8588, Japan
Kei Ito
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo181-8588, Japan
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Abstract

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One of the key questions of the observational cosmology is how the environmental dependence of galaxies today formed. Proto-clusters, galaxy overdense regions at high redshift are important laboratory to study the formation history of clusters of galaxies. We perform the first statistic study of far-infrared spectral energy distribution(SED)s of proto-clusters at z ∼ 4 by the stacking analysis of Planck/ AKARI/ IRAS images of proto-clusters at z ∼ 4 selected from the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) survey. By stacking ∼ 200 proto-clusters, we successfully constrain their average total SEDs in 60–850μm. Our results imply the excess of dusty starburst galaxies with star formation rate several 1000 M⊙yr−1 in total and obscured AGNs in proto-clusters at z ∼ 4.

Keywords

galaxies: formationlarge-scale structure of universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S341: Challenges in Panchromatic Modelling with Next Generation Facilities , November 2019 , pp. 17 - 20
Copyright
© International Astronomical Union 2020

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