Simulation of the IRIS Far-infared Survey : A Guide for Infrared Galaxy Number Counts

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概要

• 論文の詳細を見る

• Infrared Imaging Surveyor (IRIS)is a satellite which will be launched in 2003,by the M-V rocket of the ISAS (the Institute of Space and Astronautical Science). One of the main purposes of the IRIS mission is an all-sky survey at far-infrared (FIR) with a flux limit much deeper than that of IRAS. In order to examine the performance of the survey, we estimated the FIR galaxy counts in four (50,70,120,and 150μm) bands based on some models. We adopted a multicomponent model which consists of cirrus and starburst components for galaxy spectra, and the nearby FIR luminosity function derived from that of IRAS galaxies. We derived the number counts, redshift distributions, and infrared diffuse background radiation spectra for i) no evolution, ii) pure luminosity evolution, iii) pure density evolution with q_0=0.1 and 0.5. We found that a large number of galaxies (〜 a fewх10^6 in the whole sky) will be detected in this survey. With the aid of a vast number of detection, we will detect the effect of galaxy evolution, and evaluate the amplitude of evolution at least in the nearby universe in the IRIS survey, though it will be still difficult to constrain which type of evolution takes place from the number count alone. We also studied the estimation of redshifts of detected galaxies by their FIR colors alone. Although significant contamination takes place among nearbyfaint galaxies and high-z ones, we found that rough estimation of galaxy redshift can be practicable by jointly using present and future optical surveys. Thus we further studied the optical counterpart detection number of the IRIS galaxies. When we perform the optical follow-up observation of the IRIS survey, normal spiral galaxies brighter than B〜19 mag (or H〜16 mag) and starburst galaxies brighter than B〜22 mag (or H〜21 mag) will be detected. We expect to detect about 60 normal galaxies and 80 starbursts per square degree. )

• 宇宙航空研究開発機構の論文

著者

• Takeuchi Tsutomu

  Department of Parasitology, School of Medicine, Keio University

• OHTA Kouji

  Department of Astronomy, Kyoto University

• SHIBAI Hiroshi

  Division of Particle and Astrophysical Sciences, Graduate School of Science, Nagoya University

• TAKEUCHI Tsutomu

  Institute for Advanced Research, Nagoya University

• Hirashita Hiroyuki

  Department Of Astronomy Kyoto University

• Hirashita Hiroyuki

  Department Of Astronomy Faculty Of Science Kyoto University

• YOSHIKAWA Kohji

  Department of Astronomy, Kyoto University

• ISHII Takako

  Department of Astronomy, Faculty of Science, Kyoto University

• SHIBAI Hiroshi

  Department of Physics, Nagoya University

• Omata Koji

  Subaru Telescope National Astronomical Observatory Of Japan

• Ohta Kouji

  Department Of Astronomy Faculty Of Science Kyoto University

• Shibai Hiroshi

  Department Of Physics Nagoya University

• Omata Koji

  Department Of Astronomy Kyoto University

• Takeuchi T

  Nagoya Univ. Nagoya

• Yoshikawa Kohji

  Department Of Astronomy Kyoto University

• Yoshikawa Kohji

  Department Of Physics The University Of Tokyo

• Yoshikawa Kohji

  Department Of Astronomy Faculty Of Science Kyoto University

• Tanabe Toshihiko

  Univ. Tokyo Tokyo

• Takeuchi Tsutomu

  Department Of Obstetrics And Gynecology Tokyo Rinkai Hospital

• Oka Keiko

  Department Of Mathematical And Physical Science Japan Women's University

• Takeuchi Tsutomu

  Department Of Astronomy Faculty Of Science Kyoto University

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