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Apocenter Pile-up: Origin of the Stellar Halo Density Break

  • Authors: Alis J. Deason, Vasily Belokurov, Sergey E. Koposov, and Lachlan Lancaster

2018 The Astrophysical Journal Letters 862 L1.

  • Provider: AAS Journals

Caption: Figure 1.

Distance modulus of main sequence stars estimated using photometric parallax (Ivezić et al. 2008) and Gaia astrometric parallax. Here we use the distances provided by Bailer-Jones et al. (2018), and only consider bright stars with accurate parallax measurements (≤10%). We compare the derived distance measurements as a function of distance modulus (left), metallicity (middle), and g − i color (right). Note that the density plots are column normalized. The photometric estimates agree well with the astrometric parallax estimates. There is a small offset (−0.08 dex) and 0.33 dex scatter, with little variation with distance, metallicity, or color. This comparison shows that the photometric parallax can be used to measure main sequence star distances to ∼15% accuracy.

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