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FIRST RESULTS FROM THE MADCASH SURVEY: A FAINT DWARF GALAXY COMPANION TO THE LOW-MASS SPIRAL GALAXY NGC 2403 AT 3.2 MPC

  • Authors: Jeffrey L. Carlin, David J. Sand, Paul Price, Beth Willman, Ananthan Karunakaran, Kristine Spekkens, Eric F. Bell, Jean P. Brodie, Denija Crnojević, Duncan A. Forbes, Jonathan Hargis, Evan Kirby, Robert Lupton, Annika H. G. Peter, Aaron J. Romanowsky, and Jay Strader

2016 The Astrophysical Journal Letters 828 L5.

  • Provider: AAS Journals

Caption: Figure 3.

Left panel: color–magnitude diagram of point sources within ﹩20^{\prime\prime} ﹩ of MADCASH J074238+652501-dw. Typical photometric errors as a function of magnitude are shown at the left side of this panel. The other three panels show CMDs of nearby “blank-sky” regions of the same size. In each panel, we show Padova isochrones of old (10 Gyr) populations with metallicities of [M/H] = −2.2, −1.5, −1.0, and −0.5, at D = 3.39 Mpc (the distance to MADCASH J074238+652501-dw; see Section 4.1). There is an overdensity of resolved sources at the position of the dwarf, consistent with an old, metal-poor RGB, extending ∼2 mag below the RGB tip.

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