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, (Dutch for ''Hanny's object'') is a very rare type of astronomical object called a quasar ionization echo.〔 〕〔 〕 It was discovered in 2007 by Dutch school teacher Hanny van Arkel, while she was participating as a volunteer in the Galaxy Zoo project. Photographically, it appears as a bright blob close to spiral galaxy IC 2497 in the constellation Leo Minor. Ms. van Arkel also was the first to notice a Pea galaxy. ==Description== Hanny's Voorwerp (HsV) is about the size of a small galaxy and has a central hole over 16,000 light years across. In the HST image above, HsV is colored green, a standard false color that is used to represent the presence of several luminous emission lines of glowing oxygen. HsV has been shown to be at the same distance from Earth as the adjacent galaxy IC 2497, which is about 650 million light-years away. Star birth is occurring in the region of HsV that faces IC 2497. Radio observations indicate that this is due to an outflow of gas arising from the IC 2497's core which is interacting with a small region of HsV to collapse and form stars. The youngest stars are several million years old.〔 (【引用サイトリンク】url=http://www.spacetelescope.org/news/heic1102/ )〕 A picture of HsV is presented on the NASA Astronomy Picture of the Day website with data taken by Dan Smith (Liverpool John Moores University), Peter Herbert (University of Hertfordshire) and Chris Lintott (University of Oxford) on the 2.5m Isaac Newton Telescope.〔 (【引用サイトリンク】title=What is Hanny's Voorwerp? )〕 HsV is the subject of a video made by Meghan Grey and Brady Haran on the University of Nottingham's Sixty Symbols YouTube Channel.〔 〕 Recently in June 2014, an interview with the discoverer Hanny van Arkel was broadcast on TEDx Ghent that can be found on YouTube. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hanny's Voorwerp」の詳細全文を読む スポンサード リンク
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