Suzaku Observation of the Metallicity Distribution in the Elliptical Galaxy NGC 4636

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説明

The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan

NGC 4636, an X-ray bright elliptical galaxy, was observed with Suzaku. Thanks to low background and good energy resolution of the XIS, we succeeded to estimate the foreground Galactic emission accurately, and measure the metal abundance distributions out to approximately 28 arcmin (approximately equal to 140 kpc) for O, Mg, Si and Fe for the first time. Metal abundances are as high as > 1 solar within 4' and decreases by approximately 50 % from the center toward the outer region. In addition, the O to Fe abundance ratio is about from 0.6 to 1.0 solar in all analyzed regions, indicating that metal products by SNe II and SNe Ia have mixed and diffused to the outer region of the galaxy. Furthermore, comparing distribution of metal mass and mass-to-light-ratio with those of other galaxies, we found that metal distributions in NGC 4636 are less extended, possibly due to environmental factors, such as frequency of galaxy interaction. We also confirmed a signature of the resonance scattering of the Fe(sub XVII) line in the central region, as reported with the XMM-Newton RGS observation.

Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science

資料番号: AA0064574149

レポート番号: JAXA-SP-09-008E

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詳細情報 詳細情報について

  • CRID
    1050011086285880704
  • NII論文ID
    120006828551
  • NII書誌ID
    AA11984031
  • ISSN
    1349113X
  • Web Site
    http://id.nii.ac.jp/1696/00005075/
  • 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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