Context. Figure 5 Colour–velocity distributions of stars and UCDs in the. They are thought to be on the order of 200 light years across, containing about 100 million stars. These ultra-compact stellar systems could provide important insights on the formation and evolution of galaxies in the universe. First ultra-compact dwarf galaxy in the group NGC 5044 found Abstract. Your feedback will go directly to Science X editors. M60-UCD1 is packed with an extraordinary number of stars and this has led scientists to classify it as an "ultra-compact dwarf galaxy." Content on this website is for information only. Their origin is still debated as some UCDs are considered to be the remnant nuclei of stripped dwarf galaxies while others seem to mark the high-mass end of the star cluster population. Two-Minute Tour: An Ultra-Compact Dwarf Galaxy Astronomers may have discovered the densest galaxy in the nearby Universe. It is theorised that these are the cores of nucleated dwarf elliptical galaxies that have been stripped of gas and outlying stars by tidal interactions, travelling through the hearts of rich clusters. The galaxy, known as We report the discovery of a remarkable ultra-compact dwarf galaxy around the massive Virgo elliptical galaxy NGC 4649 (M60), which we call M60-UCD1. R. Astron. The Ultra-Compact Dwarf Galaxies in Galaxy Clusters 377. The astronomers investigated M60-UCD1, the brightest ultra-compact dwarf galaxy currently known, using the Gemini North 8-meter optical-and … New observations of the ultra-compact dwarf galaxy M60-UCD1 have revealed a supermassive … In Gemini+GMOS deep images of several fields around NGC 5044 and in spectroscopic multi-object data of one of these fields, we detected an unresolved source with g'~20.6 mag, compatible with being an UCD. Not. Astronomers may have discovered the densest galaxy in the nearby Universe. With an effective radius of about 18 pc and a velocity dispersion of 45 km s-1, this object is rather one of the recently discovered ultra-compact dwarf (UCD) galaxies than a star cluster. Your opinions are important to us. From the full spectral fitting technique, we measured a lower age (8.52 Gyr) and a similar total metallicity ([Z/H] = -0.86 dex). The newly discovered UCD was designated NGC 5044-UCD1. 19 Replies to “Ultra Compact Dwarf Galaxies once crowded with stars” ... astronomers thought there was a star with about 3K times the mass of the Sun in the Large Magellan galaxy- … So in today’s UCDs, a good part of their mass is made up of these dark remnants, largely invisible to Earth-based telescopes but fossils of a more dramatic past. The object, we name SUCD1, was identified in Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) imaging and confirmed to â¦ Here we report adaptive optics kinematic data of the ultra-compact dwarf galaxy M60-UCD1 that show a central velocity dispersion peak exceeding 100 kilometres per second and modest rotation. We extended our original survey of the Fornax Cluster 1 magnitude fainter, finding a further 46 new compact â¦ Have any problems using the site? Royal Astronomical Society (RAS). Ultra-Compact Dwarf Galaxies Genoveva Micheva [email protected] We recently reported the discovery of a new galaxy type, ultra-compact dwarf (UCD) galaxies, in both the Fornax and Virgo clusters. 1999, Phillipps et al. On the other hand new observations of the central galaxy of the Fornax cluster revealed a new class of unresolved, compact objects (Hilker et al. Showing page 1. Your email address is used only to let the recipient know who sent the email. These stars would have been close enough to merge from time to time, creating many much more massive stars in their place. , Phys.org, This image shows a composite view of the giant elliptical galaxy NGC 5044. Credit: Digitised Sky Survey/NASA Chandra/Southern Observatory for Astrophysical Research/Very Large Array (Robert Dunn et al.