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Haro 11
Haro 11 (H11) is a small galaxy at a distance of (redshift z=0.020598).〔(【引用サイトリンク】 url=http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=ESO%20350-IG%20038&extend=no&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1 )〕 It is situated in the southern constellation of Sculptor. Visually, it appears to be an irregular galaxy, as the ESO image to the right shows. H11 is named after Guillermo Haro, a Mexican astronomer who first included it in a study published in 1956 about blue galaxies. H11 is a starburst galaxy that has 'super star clusters' within it and is one of only two galaxies in the local universe shown to emit Lyman Continuum photons (LyC).
==Background==
Guillermo Haro first described H11 in a study published in 1956 listing 44 galaxies that were blue.〔 The observations had been carried out at the Tonantzintla Observatory in Mexico using the Schmidt Camera. Since then, The NASA/IPAC Extragalactic Database (NED) gives 123 citations for H11.〔 The first study showing the possible escape of Lyman Continuum Photons was published in 2006, using data from the Far Ultraviolet Spectroscopic Explorer (FUSE).〔 The study's aim was to select "an extreme starburst dwarf, the Blue Compact Galaxy Haro 11, with the aim of determining the Lyman continuum escape fraction from UV spectroscopy."〔
The image in the information box above right was made combining data from ESO’s Very Large Telescope and the NASA/ESA Hubble Space Telescope. A team of astronomers Stockholm University, Sweden, and the Geneva Observatory, Switzerland, identified 200 separate clusters of very young, massive stars, many of which are less than 10 million years old.〔 The observations have led the astronomers to conclude that H11 is most likely the result of a merger between a galaxy that is rich in stars and a younger, gas-rich galaxy.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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