UV-Bright Nearby Early Type Galaxies Observed in the Mid-Infrared: Evidence for a Multi-Stage Formation History by Way of WISE and GALEX Imaging

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説明

SPICA Science Conference from Exoplanets to Distant Galaxies: SPICA's New Window on the Cool Universe (June 18-21, 2013. Ito Hall, the University of Tokyo), Bunkyou-ku, Tokyo, Japan

At z less than or equal to 0.1, 10% of massive elliptical galaxies exhibit a substantial excess of ultraviolet emission over what is expected from their old stellar populations (the ‘UVX’). We explore the source and radial distribution of UVX in 49 nearby E/S0- type galaxies by measuring their extended photometry in the UV to mid-IR with GALEX, SDSS and WISE. We find a 1magnitude separation of color between the inner and outer regions. Via careful modelling, we show that this color difference is most readily explained by an approximately 0.5 to 2 Gyr age difference. This is consistent with ‘inside-out’ formation: rapid star formation in the core at greater than 4 Gyr ago, and at least one later stage starburst event coinciding with z-1.

著者人数: 12名

形態: カラー図版あり

Number of authors: 12

Physical characteristics: Original contains color illustrations

資料番号: AA1730027034

レポート番号: JAXA-SP-17-010E

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詳細情報 詳細情報について

  • CRID
    1050011086271743232
  • NII論文ID
    120006827241
  • ISSN
    24332232
  • Web Site
    http://id.nii.ac.jp/1696/00003005/
  • 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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