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A Pride of Satellites in the Constellation Leo? Discovery of the Leo VI Milky Way Satellite Ultra-faint Dwarf Galaxy with DELVE Early Data Release 3

  • Authors: C. Y. Tan, W. Cerny, A. Drlica-Wagner, A. B. Pace, M. Geha, A. P. Ji, T. S. Li, M. Adamów, D. Anbajagane, C. R. Bom, J. A. Carballo-Bello, J. L. Carlin, C. Chang, A. Chaturvedi, A. Chiti, Y. Choi, M. L. M. Collins, A. Doliva-Dolinsky, P. S. Ferguson, R. A. Gruendl, D. J. James, G. Limberg, M. Navabi, D. Martínez-Delgado, C. E. Martínez-Vázquez, G. E. Medina, B. Mutlu-Pakdil, D. L. Nidever, N. E. D. Noël, A. H. Riley, J. D. Sakowska, D. J. Sand, J. Sharp, G. S. Stringfellow, C. Tolley, D. L. Tucker, A. K. Vivas

C. Y. Tan et al 2025 The Astrophysical Journal 979 .

  • Provider: AAS Journals

Caption: Figure 7.

Left: spatial distribution of the spectroscopically confirmed Leo VI member stars (circles) and candidate member stars (triangles) with points colored by the measured line-of-sight (radial) velocity. The dashed ellipse shows the half-light radius of Leo VI. The direction of the median systemic proper motion (after correcting for solar reflex motion), computed from the three spectroscopically confirmed members with Gaia proper motion measurements, are shown with the black arrow, while the faint gray lines represent the 1000 Monte Carlo samplings from the proper motion uncertainties. The direction of proper motion aligns with the semimajor axis of Leo VI. Right: the line-of-sight (radial) velocity of Leo VI member stars (circles) and candidate member stars (triangles with dashed error bars) as a function of distance along its semimajor axis. The gray lines represent the Monte Carlo samplings used to measure the radial velocity gradient of the system along the semimajor axis. Due to the low number statistics and high uncertainty of the radial velocity measurements, we are unable to conclusively determine the presence/absence of a velocity gradient.

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