Future dreams in view as Canadian instruments power up aboard James Webb Space Telescope
The Sparkler
High-Redshift Globular Clusters Captured By JWST
Mowla & Iyer et al. 2022
Using data from JWST, we analyze the compact sources ("sparkles") located around a remarkable zspec=1.378 galaxy (the "Sparkler") that is strongly gravitationally lensed by the z=0.39 galaxy cluster SMACS J0723.3-7327. Several of these compact sources can be cross-identified in multiple images, making it clear that they are associated with the host galaxy. Combining data from JWST’s Near-Infrared Camera (NIRCam) with archival data from the Hubble Space Telescope (HST), we perform 0.4--4.4 μm photometry on these objects, finding several of them to be very red and consistent with the colors of quenched, old stellar systems. Morphological fits confirm that these red sources are spatially unresolved even in strongly magnified JWST/NIRCam images, while JWST/NIRISS spectra show [OIII]5007 emission in the body of the Sparkler but no indication of star formation in the red compact sparkles. The most natural interpretation of these compact red companions to the Sparkler is that they are evolved globular clusters seen at z=1.378. Applying Dense Basis SED-fitting to the sample, we infer formation redshifts of zform∼7-11 for these globular cluster candidates, corresponding to ages of ∼ 3.9-4.1 Gyr at the epoch of observation and a formation time just ∼0.5 Gyr after the Big Bang. If confirmed with additional spectroscopy, these red, compact “sparkles” represent the first evolved globular clusters found at high redshift, could be amongst the earliest observed objects to have quenched their star formation in the Universe, and may open a new window into understanding globular cluster formation.
