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16916

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DataCite Commons2023-04-21 更新2025-04-15 收录
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http://esdcdoi.esac.esa.int/doi/html/data/astronomy/hst/16916.html
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The lowest mass galaxies known to date - aptly named .ultra-faint dwarf galaxies. - orbit the Milky Way (MW) as satellites. Follow-up study of these objects have revealed systems that are the oldest comma most metal-poor comma and most dark matter-dominated galaxies known. They hold the potential for constraining dark matter on small scales comma placing limits on the mass threshold for successful galaxy formation comma and defining the impact reionization has on small galaxy halos. Such galaxies are predicted to be present in large numbers in the Local Group (and throughout the universe) comma yet they have belied detection due the challenges in finding instrinsically small and faint systems in a very big sky. We have discovered three ultra-faint dwarf galaxy candidates in the Dark Energy Spectrscopic Instrument (DESI) Legacy imaging data located outside the halo of the MW at distances estimated to be between 0.4-0.7 Mpc. In contrast to the population of ultra-faint dwarfs discovered as satellites of the MW comma these galaxy candidates appear to be outside the halo of the MW system comma providing a unique opportunity to test galaxy formation theories without the competing effects of a halo environment. We request 1 orbit of HST per target to confirm their detection comma measure secure distances comma and determine their structural properties. Their properties will be compared with those of ultra-faint dwarf satellites of MW and M31 comma as well as isolated very low-mass galaxies. We will determine their star formation histories from their resolved stellar populations to test whether they are quenched comma have extended (or delayed) star formation over cosmic times comma or distinct characteristics.
提供机构:
European Space Agency
创建时间:
2023-04-21
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