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Neutral gas is commonly believed to dominate over stars in the outskirts ofgalaxies, and investigations of the disk-halo interface are generallyconsidered to be in the domain of radio astronomy. This may simply be aconsequence of the fact that deep HI observations typically probe to a lowermass surface density than visible wavelength data. This paper presents lowsurface brightness optimized visible wavelength observations of the extremeoutskirts of the nearby spiral galaxy NGC 2841. We report the discovery of anenormous low-surface brightness stellar disk in this object. When azimuthallyaveraged, the stellar disk can be traced out to a radius of $\sim$70 kpc (5$R_{25}$ or 23 inner disk scale lengths). The structure in the stellar disktraces the morphology of HI emission and extended UV emission. Contrary toexpectations, the stellar mass surface density does not fall below that of thegas mass surface density at any radius. In fact, at all radii greater than$\sim$20 kpc, the ratio of the stellar to gas mass surface density is aconstant 3:1. Beyond $\sim$30 kpc, the low surface brightness stellar diskbegins to warp, which may be an indication of a physical connection between theoutskirts of the galaxy and infall from the circumgalactic medium. Acombination of stellar migration, accretion and in-situ star formation might beresponsible for building up the outer stellar disk, but whatever mechanismsformed the outer disk must also explain the constant ratio between stellar andgas mass in the outskirts of this galaxy.

The dragonfly nearby galaxies survey. Iv. A giant stellar disk in ngc 2841