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DELVE-DEEP Survey: The Faint Satellite System of NGC 55

by Crnojević, Denija , Drlica-Wagner, Alex , Carlin, Jeffrey L , Martínez-Vázquez, Clara E , Fielder, Catherine E , Pace, Andrew B , Cerny, William , Navabi, Mahdieh , Kallivayalil, Nitya , Doliva-Dolinsky, Amandine , Sand, David J , Vivas, Kathy , Sakowska, Joanna D , Medoff, Jonah , Ferguson, Peter S , Tollerud, Erik J , Walker, Alistair R , Stringfellow, Guy S , Riley, Alex H , Carballo-Bello, Julio A , Medina, Gustavo E , Mutlu-Pakdil, Burçin , Choi, Yumi , Noël, Noelia E D , Chaturvedi, Astha , Bom, Clecio R , Adamów, Monika

in Dwarf galaxies / Luminosity / Satellites / Surface brightness / Target detection

2025

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DELVE-DEEP Survey: The Faint Satellite System of NGC 55

in Dwarf galaxies / Luminosity / Satellites / Surface brightness / Target detection

2025

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DELVE-DEEP Survey: The Faint Satellite System of NGC 55

in Dwarf galaxies / Luminosity / Satellites / Surface brightness / Target detection

2025

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Paper

DELVE-DEEP Survey: The Faint Satellite System of NGC 55

Crnojević, Denija,

Drlica-Wagner, Alex,

Carlin, Jeffrey L,

Martínez-Vázquez, Clara E,

Fielder, Catherine E,

Pace, Andrew B,

Cerny, William,

Navabi, Mahdieh,

Kallivayalil, Nitya,

Doliva-Dolinsky, Amandine,

Sand, David J,

Vivas, Kathy,

Sakowska, Joanna D,

Medoff, Jonah,

Ferguson, Peter S,

Tollerud, Erik J,

Walker, Alistair R,

Stringfellow, Guy S,

Riley, Alex H,

Carballo-Bello, Julio A,

Medina, Gustavo E,

Mutlu-Pakdil, Burçin,

Choi, Yumi,

Noël, Noelia E D,

Chaturvedi, Astha,

Bom, Clecio R,

Adamów, Monika

2025

Overview

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 over-densities, while the other focuses on semi-resolved 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 \\(M_V \\lesssim -6.6\\) and surface brightness \\(\\mu \\lesssim 28.5\\) mag arcsec\\(^{-2}\\), and \\(\\sim 80\\%\\) complete down to \\(M_V \\lesssim -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.

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Cornell University Library, arXiv.org

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