Abstract

We present the first results of the ongoing Identifying Dwarfs of Magellanic Cloud Analog GalaxiEs (ID-MAGE) survey. This includes new velocities of 78 satellite candidates identified around 35 nearby LMC- and SMC-mass hosts ( D = 4–10 Mpc). Using new Green Bank Telescope H i observations, new optical long-slit spectroscopy from SALT and MDM 2.4 m, and Dark Energy Spectroscopic Instrument DR1, we find six are velocity-confirmed satellite galaxies (6.5 × 10 ⁵ ≤ M ⋆ / M ⊙ ≤ 1.5 × 10 ⁷ ) and 72 are background galaxies. Our results underscore the ability of spectroscopic follow-up to effectively separate satellites from background galaxies. Including the six newly velocity-confirmed satellites and the 19 satellites confirmed in the literature, the ID-MAGE hosts have a combined total of 25 confirmed satellites. This confirmed satellite sample includes the complete satellite populations of three hosts (UGC 04426: zero satellites; UGC 08201: zero satellites; NGC 3432: four satellites), which we compare to simulations and known satellite systems from previous systematic searches around low-mass hosts. Our confirmed satellite sample is nearly complete for the most massive satellites ( M ⋆ > 10 ⁷ M ⊙ ). We find these satellites have a quenched fraction of 10%–25%, placing them between the <5% quenched fraction of isolated galaxies and the 40%–70% quenched fraction of Milky Way–analog satellites in the same stellar mass range (10 ⁷ M ⊙ < M ⋆ < 10 ⁸ M ⊙ ). This demonstrates the impact that low-mass galaxies have on the evolution of their satellites.

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BibTeX RIS

BibTeX

@article{hunter2026idmage,
  title = {{ID-MAGE. II. The Star-forming Satellites of Low-mass Hosts}},
  author = {Laura Congreve Hunter and Burçin Mutlu-Pakdil and Michael B. Farnell and David J. Sand and Kristine Spekkens and Paul Bennet and Sasha N. Campana and Jeffrey L. Carlin and Denija Crnojević and Amandine Doliva-Dolinsky and Emmanuel Durodola and Michael G. Jones and Donghyeon J. Khim and Laurella Marin and Ricardo J. Mendez and Deepthi S. Prabhu and Dennis Zaritsky},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = nov,
  doi = {10.3847/1538-4357/aeacd4},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aeacd4},
  note = {CC BY 4.0},
}

RIS

TY  - JOUR
TI  - ID-MAGE. II. The Star-forming Satellites of Low-mass Hosts
AU  - Laura Congreve Hunter
AU  - Burçin Mutlu-Pakdil
AU  - Michael B. Farnell
AU  - David J. Sand
AU  - Kristine Spekkens
AU  - Paul Bennet
AU  - Sasha N. Campana
AU  - Jeffrey L. Carlin
AU  - Denija Crnojević
AU  - Amandine Doliva-Dolinsky
AU  - Emmanuel Durodola
AU  - Michael G. Jones
AU  - Donghyeon J. Khim
AU  - Laurella Marin
AU  - Ricardo J. Mendez
AU  - Deepthi S. Prabhu
AU  - Dennis Zaritsky
PY  - 2026
DA  - 2026/11/06
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aeacd4
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aeacd4
AB  - We present the first results of the ongoing Identifying Dwarfs of Magellanic Cloud Analog GalaxiEs (ID-MAGE) survey. This includes new velocities of 78 satellite candidates identified around 35 nearby LMC- and SMC-mass hosts ( D = 4–10 Mpc). Using new Green Bank Telescope H i observations, new optical long-slit spectroscopy from SALT and MDM 2.4 m, and Dark Energy Spectroscopic Instrument DR1, we find six are velocity-confirmed satellite galaxies (6.5 × 10 ⁵ ≤ M ⋆ / M ⊙ ≤ 1.5 × 10 ⁷ ) and 72 are background galaxies. Our results underscore the ability of spectroscopic follow-up to effectively separate satellites from background galaxies. Including the six newly velocity-confirmed satellites and the 19 satellites confirmed in the literature, the ID-MAGE hosts have a combined total of 25 confirmed satellites. This confirmed satellite sample includes the complete satellite populations of three hosts (UGC 04426: zero satellites; UGC 08201: zero satellites; NGC 3432: four satellites), which we compare to simulations and known satellite systems from previous systematic searches around low-mass hosts. Our confirmed satellite sample is nearly complete for the most massive satellites ( M ⋆ > 10 ⁷ M ⊙ ). We find these satellites have a quenched fraction of 10%–25%, placing them between the <5% quenched fraction of isolated galaxies and the 40%–70% quenched fraction of Milky Way–analog satellites in the same stellar mass range (10 ⁷ M ⊙ < M ⋆ < 10 ⁸ M ⊙ ). This demonstrates the impact that low-mass galaxies have on the evolution of their satellites.
SN  - 1538-4357
SN  - 0004-637X
ER  -

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