16186
收藏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/16186.html
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资源简介:
Recent observations of Ultra-Diffuse Galaxies (UDGs comma which have the luminosities of dwarfs but sizes of giant galaxies) have picked up a lot of attention by the community. Two nagging problems that are being discussed in the context of UDGs comma are 1) the apparent lack of dark matter of some UDGs comma and 2) their anomalously abundant-and-bright globular cluster systems. The former is difficult to reconcile with a LCDM model of structure formation comma while the latter is contrary to what we observe in essentially any other galaxy system. We have recently discovered a UDG candidate comma that may provide valuable insight towards solving both problems. This object has very similar properties to typical UDGs comma apart from a widely spread population of compact star-forming regions. Our ground-based photometry indicates that these regions have stellar masses similar to globular clusters (GCs) comma and at least three have radial profiles that are unresolved by our ground based imaging - in line with expectations for young massive clusters. The HST brings the high spatial resolution comma and imaging capability in the near-UV comma that are required to better constrain the physical sizes and formation ages of these compact regions. Interestingly and coincidentally comma some properties of this galaxy are strikingly similar to those hypothesised by Silk 2019 comma who predicts the simultaneous formation of massive GCs comma and links this to the formation of UDGs that lack dark matter and exhibit extreme GC systems. This UDG may just provide us a very rare local view on such processes in action.
提供机构:
European Space Agency
创建时间:
2023-04-21



