Bibcode
Tan, C. Y.; Cerny, W.; Pace, A. B.; Sharp, J. A.; Overdeck, K.; Drlica-Wagner, A.; Simon, J. D.; Mutlu-Pakdil, B.; Sand, D. J.; Senkevich, A. M.; Erkal, D.; Ferguson, P. S.; Sobreira, F.; Atzberger, K. R.; Carlin, J. L.; Chiti, A.; Crnojević, D.; Ji, A. P.; Johnson, L. C.; Li, T. S.; Limberg, G.; Martínez-Vázquez, C. E.; Medina, G. E.; Placco, V. M.; Riley, A. H.; Tollerud, E. J.; Vivas, A. K.; Abbott, T. M. C.; Aguena, M.; Alves, O.; Bacon, D.; Bocquet, S.; Brooks, D.; Burke, D. L.; Camilleri, R.; Carballo-Bello, J. A.; Carnero Rosell, A.; Carretero, J.; Cheng, T.-Y.; Choi, Y.; da Costa, L. N.; da Silva Pereira, M. E.; Davis, T. M.; de Vicente, J.; Desai, S.; Doel, P.; Everett, S.; Flaugher, B.; Frieman, J.; García-Bellido, J.; Gruen, D.; Gutierrez, G.; Hinton, S. R.; Hollowood, D. L.; James, D. J.; Kuehn, K.; Lee, S.; Marshall, J. L.; Mena-Fernández, J.; Menanteau, F.; Miquel, R.; Myles, J.; Navabi, M.; Nidever, D. L.; Noël, N. E. D.; Ogando, R. L. C.; Plazas Malagón, A. A.; Porredon, A.; Samuroff, S.; Sanchez, E.; Sanchez Cid, D.; Sevilla-Noarbe, I.; Smith, M.; Stringfellow, G. S.; Suchyta, E.; Swanson, M. E. C.; Vikram, V.; Walker, A. R.; Zenteno, A.; Delve Collaboration; Des Collaboration
Referencia bibliográfica
The Astrophysical Journal
Fecha de publicación:
3
2026
Revista
Número de citas
4
Número de citas referidas
0
Descripción
We report the discovery of three Milky Way satellite candidates: Carina IV, Phoenix III, and DELVE 7, in the third data release of the DECam Local Volume Exploration survey (DELVE). The candidate systems were identified by cross-matching results from two independent search algorithms. All three are extremely faint systems composed of old, metal-poor stellar populations (τ ≳ 10 Gyr, [Fe/H] ≲−1.4). Carina IV (MV = −2.8; r1/2 = 40 pc) and Phoenix III (MV = −1.2; r1/2 = 19 pc) have half-light radii that are consistent with the known population of dwarf galaxies, while DELVE 7 (MV = 1.2; r1/2 = 2 pc) is very compact and seems more likely to be a star cluster, though its nature remains ambiguous without spectroscopic follow-up. The Gaia proper motions of stars in Carina IV ( M⋆=2250−830+1180M⊙ ) indicate that it is unlikely to be associated with the LMC, while DECam CaHK photometry confirms that its member stars are metal poor. Phoenix III ( M⋆=520−290+660M⊙ ) is the faintest known satellite in the extreme outer stellar halo (DGC > 100 kpc), while DELVE 7 ( M⋆=60−40+120M⊙ ) is the faintest known satellite with DGC > 20 kpc.