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A NEW FAINT MILKY WAY SATELLITE DISCOVERED IN THE PAN-STARRS1 3π SURVEY

  • Authors: Benjamin P. M. Laevens, Nicolas F. Martin, Rodrigo A. Ibata, Hans-Walter Rix, Edouard J. Bernard, Eric F. Bell, Branimir Sesar, Annette M. N. Ferguson, Edward F. Schlafly, Colin T. Slater, William S. Burgett, Kenneth C. Chambers, Heather Flewelling, Klaus A. Hodapp, Nicholas Kaiser, Rolf-Peter Kudritzki, Robert H. Lupton, Eugene A. Magnier, Nigel Metcalfe, Jeffrey S. Morgan, Paul A. Price, John L. Tonry, Richard J. Wainscoat, and Christopher Waters

2015 The Astrophysical Journal Letters 802 L18.

  • Provider: AAS Journals

Caption: Figure 2.

Left: the CMD of Lae 2/Tri II within 2rh, with best-fit isochrones overplotted. Both isochrones have an age of 13 Gyr and are shifted to a distance modulus of 17.3. The red/blue isochrones have metallicities [Fe/H] = −2.19 and [Fe/H] = −1.80, respectively. Right: the same CMD of Lae 2/Tri II with four metal-poor fiducial isochrones from GCs observed in PS1 (Bernard et al. 2014), dereddened assuming the reddening values of (Harris 2010) and shifted to match the observed features. The green fiducial (NGC 7078; [Fe/H] = −2.37), shifted to a distance-modulus of 17.5 best represents the features of the new stellar system, with the other fiducials, i.e., red: NGC 4590 ([Fe/H] = −2.23), blue: NGC 6341 ([Fe/H] = −2.31), orange: NGC 7099 ([Fe/H] = −2.27) appearing too red or to blue to accurately reproduce the MS and MSTO. NGC 4590 is shifted to a distance-modulus of 17.5, whereas NGC 6341 and 7099 are at 17.3.

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