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17158

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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/17158.html
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Faint dwarf galaxies are the observational bedrock of small-scale cosmology and galaxy formation. The faintest of these comma the ultra-faint satellites of the Milky Way comma are particularly informativedoublePoint as they have formed so few stars comma they are very sensitive to the details of dark matter properties comma feedback and reionization. While many models have been tuned to reproduce the Milky Way.s satellite population well comma large variations between the luminosity functions of bright dwarfs in nearby groups coupled with theoretical expectations for variations in ultra-faint populations motivate searches for ultra-faint dwarfs in other groups. Recent advances in wide-field deep multi-band imaging comma star-galaxy separation and dwarf candidate search techniques place us in a position to explore this issue on a statistical footing. Sufficient data exists in five nearby galaxy groupsdoublePoint M31 comma M81 comma M64 comma M83 and M94. We have identified 55 faint and ultra-faint satellite candidates using criteria designed to be as selective and restrictive as possible comma while recovering artificial galaxies 3-10x deeper than current limits in these groups. We request 55 SNAPs with ACS and WFC3 in parallel (for local .background. estimation and legacy stellar halo science) to confirm a subset of this statistical sample. This program will confirm the faintest ever galaxy found outside the Milky Way comma will allow measurement of their luminosities and sizes comma will provide deep enough color-magnitude diagrams to constrain distance comma metallicity and young stellar populations comma and will propel robust Local Volume ultra-faint galaxy searches on an industrial scale with next-generation facilities like the Vera Rubin Observatory.
提供机构:
European Space Agency
创建时间:
2023-04-21
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