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- W2920973514 abstract "The formation of globular clusters (GC), with their multiple stellar generations, is still an unsolved puzzle. Thus, interest is rising on the possibility to detect their precursors at high redshift, hence directly witnessing their formation. A simple set of assumptions are empirically justified and then used to predict how many such precursors formed between redshift 3 and 10 could actually be detected by the Near Infrared Camera (NIRCam) instrument on board of James Webb Space Telescope. It is shown that the near power-law shape of the rest-frame UV continuum of young globular cluster precursors (GCPs) implies that both colours and luminosities in NIRCam long-wavelength passbands depend remarkably weakly on formation redshift. Thus, the predicted number counts depend only little on the actual formation redshifts in the mentioned range, with the exception of the bluest passbands for which counts can be strongly suppressed by intergalactic absorption along the line of sight. Instead, counts depend strongly on the actual mass of GCPs, in such a way that one NIRCam pointing should detect of the order of 10 GCPs to mag ∼30 if their mass distribution was the same of today GCs, or over 1000 if their mass was 10 times higher. Therefore, GCP number counts will set fairly tight constraints on the initial mass of GCs. An encouraging agreement with the number density of candidate GCPs at z = 6–8, revealed by the Hubble Frontier Fields programme, suggests that their initial mass could be at least four times higher than that of their local descendants if all were to end up as GCs." @default.
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- W2920973514 date "2019-03-19" @default.
- W2920973514 modified "2023-10-14" @default.
- W2920973514 title "Search instructions for globular clusters in formation at high redshifts" @default.
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- W2920973514 doi "https://doi.org/10.1093/mnras/stz785" @default.
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