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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 8.

K-corrected CMD of MACS0416 GCs in MF200W versus (F150W − F200W)0. Dashed lines mark stellar-mass reference levels of 107 and 108 M⊙, derived for (M/L)F200W = 1.5 and a solar M(F200W)⊙ = +5.3 AB mag. PARSEC SSP tracks for [M/H] = −2.0 (blue) and +0.2 (red) are shown with filled symbols denoting ages from 5 to 9 Gyr. Most candidates fall between the 107 and 108 M⊙ lines and within the 5–9 Gyr loci, consistent with an intermediate-to-old GC population, while a few bright objects above these thresholds may correspond to UCD-like systems or modest age/metallicity variations.

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