TY - JOUR
T1 - DELVE-DEEP Survey
T2 - The Faint Satellite System of NGC 55
AU - Medoff, Jonah
AU - Mutlu-Pakdil, Burçin
AU - Carlin, Jeffrey L.
AU - Drlica-Wagner, Alex
AU - Tollerud, Erik J.
AU - Doliva-Dolinsky, Amandine
AU - Sand, David J.
AU - Martínez-Vázquez, Clara E.
AU - Stringfellow, Guy S.
AU - Cerny, William
AU - Crnojević, Denija
AU - Ferguson, Peter S.
AU - Fielder, Catherine E.
AU - Chaturvedi, Astha
AU - Kallivayalil, Nitya
AU - Noël, Noelia E.D.
AU - Vivas, Kathy
AU - Walker, Alistair R.
AU - Adamów, Monika
AU - Bom, Clecio R.
AU - Carballo-Bello, Julio A.
AU - Choi, Yumi
AU - Medina, Gustavo E.
AU - Navabi, Mahdieh
AU - Pace, Andrew B.
AU - Riley, Alex H.
AU - Sakowska, Joanna D.
N1 - Publisher Copyright:
© 2025. The Author(s). Published by the American Astronomical Society.
PY - 2024/9/10
Y1 - 2024/9/10
N2 - We report the first comprehensive census of the satellite dwarf galaxies around NGC 55 (2.1 Mpc) as a part of the DECam Local Volume Exploration DEEP (DELVE-DEEP) survey. NGC 55 is one of four isolated, Magellanic analogs in the Local Volume around which DELVE-DEEP aims to identify faint dwarfs and other substructures. We employ two complementary detection methods: one targets fully resolved dwarf galaxies by identifying them as stellar overdensities, while the other focuses on semiresolved dwarf galaxies, detecting them through shredded unresolved light components. As shown through extensive tests with injected galaxies, our search is sensitive to candidates down to MV ≲ −6.6 and surface brightness μ ≲ 28.5 mag arcsec2, and ∼80% complete down to MV ≲ −7.8. We do not report any new confirmed satellites beyond two previously known systems, ESO 294-010 and NGC 55-dw1. We construct the satellite luminosity function of NGC 55 and find it to be consistent with the predictions from cosmological simulations. As one of the first complete luminosity functions for a Magellanic analog, our results provide a glimpse of the constraints on low-mass-host satellite populations that will be further explored by upcoming surveys, such as the Vera C. Rubin Observatory’s Legacy Survey of Space and Time.
AB - We report the first comprehensive census of the satellite dwarf galaxies around NGC 55 (2.1 Mpc) as a part of the DECam Local Volume Exploration DEEP (DELVE-DEEP) survey. NGC 55 is one of four isolated, Magellanic analogs in the Local Volume around which DELVE-DEEP aims to identify faint dwarfs and other substructures. We employ two complementary detection methods: one targets fully resolved dwarf galaxies by identifying them as stellar overdensities, while the other focuses on semiresolved dwarf galaxies, detecting them through shredded unresolved light components. As shown through extensive tests with injected galaxies, our search is sensitive to candidates down to MV ≲ −6.6 and surface brightness μ ≲ 28.5 mag arcsec2, and ∼80% complete down to MV ≲ −7.8. We do not report any new confirmed satellites beyond two previously known systems, ESO 294-010 and NGC 55-dw1. We construct the satellite luminosity function of NGC 55 and find it to be consistent with the predictions from cosmological simulations. As one of the first complete luminosity functions for a Magellanic analog, our results provide a glimpse of the constraints on low-mass-host satellite populations that will be further explored by upcoming surveys, such as the Vera C. Rubin Observatory’s Legacy Survey of Space and Time.
UR - https://www.scopus.com/pages/publications/105015884579
UR - https://www.scopus.com/pages/publications/105015884579#tab=citedBy
U2 - 10.3847/1538-4357/adf211
DO - 10.3847/1538-4357/adf211
M3 - Article
AN - SCOPUS:105015884579
SN - 0004-637X
VL - 990
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 108
ER -