In Pursuit of the Least Luminous Galaxies

Figure 2

(a) Map of all stars in the field around the Ursa Major I dwarf satellite, 𝑀_𝑉=−5.5, 𝑑= 100 kpc. (b) Map of stars passing the CM filter projected to 𝑚−𝑀=20.0 shown in Figure 1(c). (c) Spatially smoothed number density map of the stars in (b). The Ursa Major I dwarf galaxy has a 𝜇_𝑉,0 of only 27.5 mag arcsec² [63]. Data are from SDSS DR7.

(a)

(b)

(c)