The multi-age stellar populations of Terzan 5 as revealed by JWST
G. Zullo, C. Pallanca, F. R. Ferraro, B. Lanzoni, L. Origlia, D. Massari, E. Dalessandro, C. Fanelli, M. Cadelano, E. Vesperini, C. Crociati, R. M. Rich, E. Valenti

TL;DR
This study uses JWST and archival HST data to analyze Terzan 5, revealing multiple stellar populations with distinct ages and chemical properties, shedding light on its complex formation history.
Contribution
First deep photometric analysis of Terzan 5 with JWST, identifying multiple stellar populations and their ages, providing insights into its origin as a bulge fossil fragment.
Findings
Identified two main stellar components aged 12.5 and 4.7 Gyr.
Detected a potential third younger component around 3.8 Gyr.
Evidence of prolonged star formation up to 2.5 Gyr ago.
Abstract
The James Webb Space Telescope provides an exciting opportunity to investigate stellar systems located in heavily obscured regions like the Galactic bulge. Possibly, the most enigmatic among them is Terzan 5: long classified as a globular cluster, it is now known to host distinct stellar populations with different iron abundances (ranging approximately from [Fe/H]=- to [Fe/H]= dex). Indeed the chemical and structural properties collected so far suggest that it is the remnant of one of the primordial clumps that contributed to the early assembly of the bulge, a so-called "Bulge Fossil Fragment". Here we present a new photometric analysis of Terzan 5 based on JWST/NIRCam observations in the F115W and F200W filters, as well as archival HST/ACS optical (F606W and F814W) data. The dataset overcomes the severe and spatially variable extinction along the line of sight and yields the…
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