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Magnification by Galaxy Group Dark Matter Halos

  • Authors: Jes Ford, Hendrik Hildebrandt, Ludovic Van Waerbeke, Alexie Leauthaud, Peter Capak, Alexis Finoguenov, Masayuki Tanaka, Matthew R. George, and Jason Rhodes

Ford et al. 2012 The Astrophysical Journal 754 143.

  • Provider: AAS Journals

Caption: Figure 2.

Angular cross-correlation of the X-ray groups with Lyman break galaxies, the latter separated into three magnitude-selected samples. The bright sample contains U-, G-, B-, and R-dropouts in the magnitude ranges 23 < r < 25, 23.5 < i < 25, 23.5 < i < 25, and 24 < z < 25.5, respectively. Similarly, the medium ranges are 25 < r < 25.5, 25 < i < 26, 25 < i < 26, 25.5 < z < 26. The faint ranges are r > 25.5, i > 26, i > 26, z > 26. These magnitude ranges are selected to contain LBGs for which (α − 1) > 0, ≈0, and <0. The measured correlations for each LBG sample are simply averaged here (weighting by the number counts) in order to more clearly display this diagnostic check. The dashed curves are calculated from the composite-NFW fit, using weighting by the appropriate langα − 1 rang factor, which is given in each panel. The negative correlation observed for the faintest sample is a good indication that no redshift overlap exists between foreground lenses and background sources.

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