An international team of astronomers reports the detection of a new faint ultra-diffuse dwarf galaxy as part of a systematic wide-area search for faint dwarf galaxies using the Dark Energy Survey (DES). The newfound object, designated NGC 55-dw1, is a satellite of the galaxy NGC 55. The finding was detailed in a paper published September 8 on the pre-print server arXiv.
Spatial distribution of stars near NGC 55-dw1. Credit: McNanna et al., 2023.
Recently, a group of astronomers led by Mitch McNanna of the University of Wisconsin-Madison has discovered a new UDG, which turned out to be a satellite of NGC 55—a barred spiral galaxy located about 6.5 millionaway in the constellation Sculptor. The discovery is based on the full six years of DES wide-area survey observations .
The newfound UDG, which received NGC 55-dw1, is separated by only 47 arcminutes from NGC 55. Therefore, assuming that the galaxy and its satellite are roughly co-distant, they are separated by only 98,000 light years. The large spatial extent of NGC 55-dw1 relative to its luminosity makes it unusual among the known population of dwarf
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