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
| Autor: | Petty, Sara M., Neill, James D., Jarrett, Tom, Blain, Andrew, Farrah, Duncan, Rich, R. M., Tsai, Chao-Wei, Benford, Dominic, Bridge, Carrie, Lake, Sean |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Zdroj: | 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. :149-151 |
| ISSN: | 2433-2232 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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