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
収録刊行物
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- 宇宙航空研究開発機構特別資料 = JAXA Special Publication: Proceedings of the SPICA Science Conference from Exoplanets to Distant Galaxies: SPICA's New Window on the Cool Universe
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宇宙航空研究開発機構特別資料 = JAXA Special Publication: Proceedings of the SPICA Science Conference from Exoplanets to Distant Galaxies: SPICA's New Window on the Cool Universe JAXA-SP-17-010E 149-151, 2018-03-09
宇宙航空研究開発機構(JAXA)
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詳細情報 詳細情報について
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- CRID
- 1050011086271743232
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- NII論文ID
- 120006827241
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- ISSN
- 24332232
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- Web Site
- http://id.nii.ac.jp/1696/00003005/
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- 本文言語コード
- en
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- 資料種別
- conference paper
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- データソース種別
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- IRDB
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