16294
收藏DataCite Commons2023-04-21 更新2025-04-15 收录
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Energetically comma it is possible for a starburst in a dwarf galaxy to blow away and completely ionize its ISM comma resulting in a very high escape fraction of its ionizing radiation. Finding examples of such galaxies would ease the tension between the energy needed to reionize the universe and the ionizing energy budget available to do so. Pox 186 is an exceptional dwarf galaxy with an active starburst comma yet a non-detection in deep 21cm HI observations. Its optical spectrum also shows very highly ionized gas comma with an extraordinary CORCHETE_OPENOIIICORCHETE_CLOSE-CORCHETE_OPENOIICORCHETE_CLOSE ratio (> 20) comma and evidence of an 800 km-s outflow. Thus comma Pox 186 has many physical properties consistent with those of the Green Pea galaxies - low redshift analogs of the sources responsible for the reionization of the universe. However comma Green Peas are dominated by bright star clusters embedded in larger systems many times more massive than the galaxies responsible for reionization. The lower mass of Pox 186 makes it a better match to the high redshift systems. When combined with its close proximity (Dvirgul18 Mpc) comma Pox 186 offers a unique laboratory to study in detail the extreme properties of a galaxy like those responsible for reionization. We will image Pox 186 with both narrow and broadband filters and obtain a UV COS spectrum with the G160M grating. The imaging will allow us to study the ionization structure to confirm the density bounded nature of the galaxy. The UV spectrum will be used to study the structure of the outflow comma the stars driving the outflow comma and to directly compare what one could learn from a similar unresolved comma high redshift system.
提供机构:
European Space Agency
创建时间:
2023-04-21



