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An HST Wide-field Survey of the Galactic Bulge: Overview, Strategy, and First Results

  • Authors: Sean K. Terry, Jay Anderson, Charles A. Beichman, David P. Bennett, Aparna Bhattacharya, Jean-Philippe Beaulieu, B. Scott Gaudi, Joel Green, Macy J. Huston, Jessica R. Lu, Ray A. Lucas, David M. Nataf, Matthew T. Penny, Natalia E. Rektsini, Carolina Rodriguez Sanchez-Vahamonde, Aikaterini Vandorou

Sean K. Terry et al 2026 The Astrophysical Journal Letters 1003 .

  • Provider: AAS Journals

Caption: Figure 5.

Top panel: CMD for stars in the HST-ACS field HD138 (black points) compared to a simulated CMD for the same FoV generated via SynthPop (blue points). We show three MIST stellar isochrones with varying metallicities and mass fractions (yellow, orange, red) for comparison. Bottom panels: the observed HST LFs (open squares) for this ACS field in the F814W (left) and F606W (right) passbands compared to the SynthPop simulation (blue histograms). The completeness-corrected HST counts, which come from artificial star tests (Section 4.2), are shown as filled squares.

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