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• W2124386228 abstract "We report the discovery of an ultra-compact dwarf (UCD) associated with the Sombrero galaxy (M104). This is the closest massive UCD known and the first spectroscopically verified massive UCD which is located in a low-density environment. The object, we name SUCD1, was identified in Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) imaging and confirmed to be associated with the Sombrero galaxy by its recession velocity obtained from Keck spectra. The light profile is well fitted by a Wilson model. We measure a half-light size of 14.7 ± 1.4 pc, an absolute magnitude of MV = −12.3 mag (MK =− 15.1 mag) and an internal velocity dispersion of 25.0 ± 5.6 km s −1 . Such values are typical of UCDs. From Lick spectral indices we measure a luminosity-weighted central age of 12.6 ± 0.9 Gyr, [Fe/H] of −0.08 ± 0.08 dex and [α/Fe] of 0.06 ± 0.07 dex. The lack of colour gradients suggests these values are representative of the entire UCD. The derived stellar and virial masses are the same, within errors, at ∼3.3 × 10 7 M� . Thus, we find no strong evidence for dark matter or the need to invoke a non-standard initial mass function. We also report arguably the first X-ray detection of a bona fide UCD, which we attribute to the presence of low-mass X-ray binaries. The X-ray luminosity of LX = 0.56 × 10 38 erg s −1 is consistent with the values observed for globular clusters (GCs) of the same metallicity. Overall, we find SUCD1 has properties similar to other known UCDs and massive GCs." @default.
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• W2124386228 date "2009-03-21" @default.
• W2124386228 modified "2023-09-23" @default.
• W2124386228 title "An ultra-compact dwarf around the Sombrero galaxy (M104): the nearest massive UCD" @default.
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• W2124386228 doi "https://doi.org/10.1111/j.1745-3933.2009.00618.x" @default.
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