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Autors principals:	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., Rosell, A. Carnero, Carretero, J., Cheng, T. -Y., Choi, Y., da Costa, L. N., Pereira, M. E. da Silva, 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., Malagón, A. A. Plazas, Porredon, A., Samuroff, S., Sanchez, E., Cid, D. Sanchez, Sevilla-Noarbe, I., Smith, M., Stringfellow, G. S., Suchyta, E., Swanson, M. E. C., Vikram, V., Walker, A. R., Zenteno, A.
Format:	Preprint
Publicat:	2025
Matèries:	Astrophysics of Galaxies
Accés en línia:	https://arxiv.org/abs/2510.11684
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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 ($τ\gtrsim 10$ Gyr, [Fe/H] $ \lesssim -1.4$). Carina IV ($M_V = -2.8;\ r_{1/2} = 40 {\rm pc}$) and Phoenix III ($M_V = -1.2;\ r_{1/2} = 19 {\rm pc}$) have half-light radii that are consistent with the known population of dwarf galaxies, while DELVE 7 ($M_V = 1.2;\ r_{1/2} = 2 {\rm pc}$) is very compact and seems more likely to be a star cluster, though its nature remains ambiguous without spectroscopic followup. The Gaia proper motions of stars in Carina IV ($M_* = 2250^{+1180}_{-830} {\rm M_\odot}$) indicate that it is unlikely to be associated with the LMC, while DECam CaHK photometry confirms that its member stars are metal-poor. Phoenix III ($M_* = 520^{+660}_{-290} {\rm M_\odot}$) is the faintest known satellite in the extreme outer stellar halo ($D_{\rm GC} > 100$ kpc), while DELVE 7 ($M_* = 60^{+120}_{-40} {\rm M_\odot}$) is the faintest known satellite with $D_{\rm GC} > 20$ kpc.

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