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Active and dust obscured star-forming galaxies at z ∼ 4 probed with UV spectral slope beta

Published online by Cambridge University Press:  10 June 2020

Satoshi Yamanaka Open the ORCID record for Satoshi Yamanaka [Opens in a new window]  and
Toru Yamada
Satoshi Yamanaka
Affiliation:
Department of Environmental Science and Technology, Faculty of Design Technology, Osaka Sangyo University, 3-1-1, Nakagaito, Daito, Osaka574-8530, Japan email: s.yamanaka@est.osaka-sandai.ac.jp
Toru Yamada
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1, Yoshinodai, Chuo-ku, Sagamihara, Kanagawa, 252-5210, Japan email: yamada@ir.isas.jaxa.jp
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Abstract

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We investigate the stellar population of star-forming galaxies at z ∼ 4 by focusing on their slope of rest-frame ultraviolet continuum called UV spectral slope β. We analyze the sample of bright Lyman Break Galaxies (LBGs) with Subaru/i′≤26.0in the Subaru/XMM-Newton Deep Survey field. Our detailed SED fitting analysis indicates that the LBGs with observed UV slope > −1.7, , Av > 1.0, and intrinsic UV slope < −2.5 are the intrinsically active star-forming galaxies with star formation rates larger than a few × 102 M⊙yr−1. A significant fraction of the UV-selected LBGs at z ∼ 4 is on-going active and dust obscured star-forming galaxies.

Keywords

galaxies: evolutiongalaxies: formationgalaxies: high-redshiftgalaxies: starburst
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. 323 - 325
Copyright
© International Astronomical Union 2020

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