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Jansky VLA S-band view of Hα emitters (HAEs) associated with a protocluster 4C23.56 at z = 2.5

Published online by Cambridge University Press:  09 February 2015

Minju Lee ,
Kenta Suzuki ,
Kotaro Kohno ,
Yoichi Tamura ,
Daisuke Iono ,
Bunyo Hatsukade ,
Kouichiro Nakanishi ,
Ichi Tanaka ,
Tadayuki Kodama  and
Kenichi Tadaki
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Minju Lee
Affiliation:
Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo133-0033, Japan National Observatory of Japan, 2-21-1Osawa, Mitaka, Tokyo181-0015, Japan email: minju.lee@nao.ac.jp
Kenta Suzuki
Affiliation:
Institute of Astronomy, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo, 181-0015, Japan
Kotaro Kohno
Affiliation:
Institute of Astronomy, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo, 181-0015, Japan
Yoichi Tamura
Affiliation:
Institute of Astronomy, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo, 181-0015, Japan
Daisuke Iono
Affiliation:
National Observatory of Japan, 2-21-1Osawa, Mitaka, Tokyo181-0015, Japan email: minju.lee@nao.ac.jp
Bunyo Hatsukade
Affiliation:
National Observatory of Japan, 2-21-1Osawa, Mitaka, Tokyo181-0015, Japan email: minju.lee@nao.ac.jp
Kouichiro Nakanishi
Affiliation:
National Observatory of Japan, 2-21-1Osawa, Mitaka, Tokyo181-0015, Japan email: minju.lee@nao.ac.jp
Ichi Tanaka
Affiliation:
National Observatory of Japan, 2-21-1Osawa, Mitaka, Tokyo181-0015, Japan email: minju.lee@nao.ac.jp
Tadayuki Kodama
Affiliation:
National Observatory of Japan, 2-21-1Osawa, Mitaka, Tokyo181-0015, Japan email: minju.lee@nao.ac.jp
Kenichi Tadaki
Affiliation:
National Observatory of Japan, 2-21-1Osawa, Mitaka, Tokyo181-0015, Japan email: minju.lee@nao.ac.jp
Soh Ikarashi
Affiliation:
National Observatory of Japan, 2-21-1Osawa, Mitaka, Tokyo181-0015, Japan email: minju.lee@nao.ac.jp European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748Garching, Germany
Junko Ueda
Affiliation:
National Observatory of Japan, 2-21-1Osawa, Mitaka, Tokyo181-0015, Japan email: minju.lee@nao.ac.jp
Hideki Umehata
Affiliation:
Institute of Astronomy, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo, 181-0015, Japan
Toshiki Saito
Affiliation:
Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo133-0033, Japan National Observatory of Japan, 2-21-1Osawa, Mitaka, Tokyo181-0015, Japan email: minju.lee@nao.ac.jp
Ryohei Kawabe
Affiliation:
National Observatory of Japan, 2-21-1Osawa, Mitaka, Tokyo181-0015, Japan email: minju.lee@nao.ac.jp
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Abstract

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We present recent results on Karl Jansky Very Large Array (JVLA) deep S-band (2-4 GHz) observation towards a protocluster 4C23.56 at redshift z ∼ 2.5. The protocluster 4C23.56 is known to have a significant over density (∼ 5 times) of star-burst galaxies selected to be Hα line-bright by a Subaru narrow band imaging. Now we have found 25 HAEs associated with the protocluster. These starburst HAEs are likely to become massive ellipticals at z = 0 in a cluster. Various other galaxy populations also reside in this field and the fact makes the field very unique as a tool to understand galaxy formation in a over dense region. Subsequent deep 1100-μm continuum surveys by the ASTE 10-m dish have discovered that several submillimeter bright galaxies (SMGs) coincide with HAEs, suggesting HAEs undergoing dusty starbursts. As star formation rates (SFRs) of HAEs might have been underestimated, we use radio being resistant to dust extinction. We investigate the correlation between SFR1.4 GHz and SFRHα for radio index α = 0.8 to see if the correlation holds for the sources and to check the number of dusty star forming galaxies. Our final results will allow us to evaluate quantitatively how the galaxy formation channel may be different under the condition of over-densities.

Keywords

galaxies: active – galaxies: clusters: general –surveys – galaxies: evolution – galaxies: formation – galaxies: high-redshift – radio continuum: galaxies – galaxies: starburst
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 287 - 288
Copyright
Copyright © International Astronomical Union 2015 

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