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Globular Clusters in the Galaxy Cluster MACS0416 at z = 0.397

  • Authors: Jessica M. Berkheimer, Rogier A. Windhorst, William E. Harris, Anton M. Koekemoer, Timothy Carleton, Seth H. Cohen, Rolf A. Jansen, Dan Coe, Jose Diego, Christopher J. Conselice, Simon P. Driver, Brenda L. Frye, Norman A. Grogin, Kate Hartman, Tyler R. Hinrichs, Benne W. Holwerda, Patrick S. Kamieneski, Kaitlyn E. Keatley, William C. Keel, Ray A. Lucas, Madeline A. Marshall, Mario Nonino, Nor Pirzkal, Massimo Ricotti, Clayton D. Robertson, Aaron Robotham, Russell E. Ryan, Jake Summers, Christopher N.A. Willmer, Haojing Yan

Jessica M. Berkheimer et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 2.

Upper panel: DAOPHOT sharp parameter versus F200W magnitude for all detected sources. The dashed horizontal lines mark the adopted selection range (−0.3 < sharp200 < 0.35), outside of which objects are excluded as nonstellar or poorly fit by the PSF. Lower panel: results from artificial-star tests, showing that genuine point sources occupy the same sharpness range, and thus motivate the adopted boundaries. A bright-end cut at F200W < 26 is also applied, consistent with the luminosity limits of confirmed GCs at z ∼ 0.4 (W. E. Harris & M. Reina-Campos 2023, 2024).

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