文章基本信息

标题：An ultra diffuse galaxy in the NGC 5846 group from the VEGAS survey
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作者：Duncan A. Forbes ; Jonah Gannon ; Warrick J. Couch 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2019
卷号：626
DOI：10.1051/0004-6361/201935499
语种：English
出版社：EDP Sciences
摘要：Context.Many ultra diffuse galaxies (UDGs) have now been identified in clusters of galaxies. However, the number of nearby UDGs suitable for detailed follow-up remain rare.Aims.Our aim is to begin to identify UDGs in the environments of nearby bright early-type galaxies from the VEGAS survey.Methods.Here we use a deepgband image of the NGC 5846 group, taken as part of the VEGAS survey, to search for UDGs.Results.We found one object with properties of a UDG if it associated with the NGC 5846 group, which seems likely. The galaxy, we name NGC 5846_UDG1, has an absolute magnitude ofMg= −14.2, corresponding to a stellar mass of ∼108M⊙. It also reveals a system of compact sources which are likely globular clusters. Based on the number of globular clusters detected we estimate a halo mass that is greater than 8 × 1010M⊙for UDG1.
关键词：engalaxies: dwarfgalaxies: formationgalaxies: star clusters: generalgalaxies: halos