Papers › Identifying Dwarfs of MC Analog GalaxiEs (ID-MAGE): The Search for Satellites Around...
Identifying Dwarfs of MC Analog GalaxiEs (ID-MAGE): The Search for Satellites Around Low-Mass Hosts
Laura Congreve Hunter, Burçin Mutlu-Pakdil, David J. Sand, Paul Bennet, Donghyeon J. Khim, Denija Crnojević, Amandine Doliva-Dolinsky, Emmanuel Durodola, Catherine Fielder, Rowan Goebel-Bain, Michael G. Jones, Ananthan Karunakaran, Kristine Spekkens, Dennis Zaritsky
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We present results from ID-MAGE (Identifying Dwarfs of MC Analog GalaxiEs), a survey aimed at identifying and characterizing unresolved satellite galaxies around 36~nearby LMC- and SMC-mass hosts (D=4-10~Mpc). We use archival DESI Legacy Survey imaging data and perform an extensive search for dwarf satellites, extending out to a radius of 150~kpc (∼Rᵥᵢᵣ). We identify 355 candidate satellite galaxies, including 264 new discoveries. Extensive tests with injected galaxies demonstrate that the survey is complete down to M_V∼-9.0 (assuming the distance of the host) and μ_(0,V)∼26 mag arcsec⁻² (assuming a n=1 S\'ersic profile). We perform consistent photometry, via S\'ersic profile fitting, on all candidates and have initiated a comprehensive follow-up campaign to confirm and characterize candidates. Through a systematic visual inspection campaign, we classify the top candidates as high-likelihood satellites. On average, we find 4.0±1.4 high-likelihood candidate satellites per LMC-mass host and 2.1±0.6 per SMC-mass host which is within the range predicted by cosmological models. We use this sample to establish upper and lower estimates on the satellite luminosity function of LMC/SMC-mass galaxies. ID-MAGE nearly triples the number of low-mass galaxies surveyed for satellites with well-characterized completeness limits, providing a unique dataset to explore small-scale structure and dwarf galaxy evolution around low-mass hosts in diverse environments.
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