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Probing the Initial Mass Function in the Early Universe: Direct Measurements in the Boötes I Ultrafaint Dwarf Galaxy with JWST/NIRCam

Authors: Keyi Ding, 可怿丁, Mario Gennaro, Roberto J. Avila, Massimo Ricotti, Rachael L. Beaton, Martha L. Boyer, Thomas M. Brown, Annalisa Calamida, Santi Cassisi, Vedant Chandra, Roger E. Cohen, Matteo Correnti, Denija Crnojević, Kareem El-Badry, Marla Geha, Puragra Guhathakurta, Nitya Kallivayalil, Evan N. Kirby, Kristen. B. W. McQuinn, Alessandro Savino, Cheyanne Shariat, Joshua D. Simon, Daniel R. Weisz

Keyi Ding et al 2026 The Astrophysical Journal 1009 .

Provider: AAS Journals

Caption: Figure 1.

Digitized Sky Survey image of Bootes I. The black outlines show the approximate locations of the five ACS visits from T. M. Brown et al. (2014). The solid-colored squares show the locations of our F322W JWST observations. Each color corresponds to a visit and each pair within a colored pair represents the two NIRCam modules. The dashed circle shows the projected half-light radius based on R. R. Muñoz et al. (2018).

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