Analyzing Hydrogen Recombination Lines in the Infrared and Optical to Determine Extinction and SFRs of Dusty Infrared Galaxies

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第4回「あかり」国際会議 (2017年10月17-20日. 東京大学), 文京区, 東京

The 4th AKARI International Conference: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (October 17-20, 2017. The University of Tokyo), Bunkyo-ku, Tokyo, Japan

Star formation rate (SFR) is important to quantify for galaxies because it provides a method for reconstructing the cosmic history of star formation in the universe. H is frequently utilized in SFR studies, however, this hydrogen recombination line is strongly affected by interstellar dust extinction. For a sample of 23 galaxies, we report Br alpha/H alpha and H alpha/H beta measurements and found that for most of our sample, the traditional Balmer decrement, H alpha/H beta, unexpectedly gives higher A(sub V) than when Br alpha/H alpha is used when we adopt the Calzetti extinction law. In addition, galaxies with the highest specific star formation rate (SSFR) on average have higher A(sub V)(Br alpha/H alpha) than A(sub V)(H alpha/H beta). However, we do not find a clear trend of the line ratios against L(sub IR) or IR/UV.

形態: カラー図版あり

Physical characteristics: Original contains color illustrations

資料番号: AA1730026066

レポート番号: JAXA-SP-17-009E

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詳細情報 詳細情報について

  • CRID
    1050011086286094080
  • NII論文ID
    120006827370
  • ISSN
    24332232
  • Web Site
    http://id.nii.ac.jp/1696/00003134/
  • 本文言語コード
    en
  • 資料種別
    conference paper
  • データソース種別
    • IRDB
    • CiNii Articles

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