Giant Galaxies, Dwarfs, and Debris Survey. I. Dwarf Galaxies and Tidal Features Around NGC 7331
Johannes Ludwig, Anna Pasquali, Eva K. Grebel, John S. Gallagher, III

TL;DR
This study uses deep imaging to identify dwarf galaxies and tidal features around NGC 7331, revealing a few low-luminosity satellites and a possible tidal stream, providing insights into galaxy interactions in small groups.
Contribution
First detailed imaging survey of NGC 7331's surroundings, identifying dwarf candidates and tidal features, and comparing its satellite system to other nearby spirals.
Findings
Detected four dwarf galaxy candidates with properties consistent with dSph.
Identified a faint stellar stream possibly resulting from tidal interaction.
NGC 7331 has fewer early-type satellites compared to other giant spirals.
Abstract
The Giant GAlaxies, Dwarfs, and Debris Survey concentrates on the nearby universe to study how galaxies have interacted in groups of different morphology, density, and richness. In these groups we select the dominant spiral galaxy and search its surroundings for dwarf galaxies and tidal interactions. This paper presents the first results from deep wide-field imaging of NGC 7331, where we detect only four low luminosity candidate dwarf companions and a stellar stream that may be evidence of a past tidal interaction. The dwarf galaxy candidates have surface brightnesses of mu_{r} ~ 23-25 mag/arcsec^{2} with (g-r) colors of 0.57-0.75mag in the Sloan Digital Sky Survey filter system, consistent with their being dwarf spheroidal galaxies (dSph). A faint stellar stream structure on the western edge of NGC 7331 has mu_{g} ~27 mag/arcsec^{2} and a relatively blue color of (g-r)=0.15mag. If it…
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