| Summary: | We report spectroscopic results from our 40-orbit Hubble Space Telescope slitless grism spectroscopy program observing the 20 densest Clusters Around Radio-Loud AGN (CARLA) candidate galaxy clusters at 1.4<z<2.8. "structures,"="" (1.0="" (forming)="" 0.87<z<2.12="" 1.4="" 1.4<z<2.8="" 1.5).="" 1010-1011momember="" 16="" 408="" 420="" <="" [3.6]-[4.5]="" a="" activity="" additional="" adopt="" agn.="" all="" also="" although="" among="" and="" approach="" are="" as="" associated="" at="" basis="" be="" being="" bona="" by="" calling="" candidate="" carla="" census="" cluster="" clusters="" clusters.="" color="" confirmation="" confirmations="" confirmed="" confirmed,="" conservative="" consistent="" cores="" counterparts="" coverage="" deeper="" design,="" discovery="" distant="" doubling="" efficient="" emission="" evolved,="" features="" fewer="" fide="" field="" fields,="" find="" finding="" form="" from="" galaxies="" galaxies.="" galaxy="" grism="" high="" high-redshift="" higher="" homogenous="" hr="" identified="" in="" just="" known,="" lacking="" large="" line="" lower="" massive="" more="" most="" multi-band="" multi-cycle="" not="" note="" number="" observe="" obtaining="" obtains="" of="" on="" only="" orbits="" our="" per="" population="" potentially="" powerful="" program="" radio-loud="" redshifts="" redshifts,="" report="" represents="" required="" rich="" richest="" sample="" serendipitous="" seven="" significantly="" similar="" slightly="" some="" spectroscopic="" spectroscopically="" spectroscopy="" spitzer="" star-forming="" stars="" strategy="" structure="" structures="" structures,="" study="" survey="" surveys="" targeted="" targeting="" than="" that="" the="" their="" them="" these="" this="" to="" together="" trends="" two="" unique="" up="" very="" we="" were="" will="" with="" within="" z="" ≤2.="" ≤z=""> 1.4.</z<2.8.>
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