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The Reionization Era Bright Emission Line Survey (REBELS) is a cycle-7 ALMALarge Program (LP) that is identifying and performing a first characterizationof many of the most luminous star-forming galaxies known in the z>6.5 universe.REBELS is providing this probe by systematically scanning 40 of the brightestUV-selected galaxies identified over a 7-deg**2 area for bright 158-micron[CII] and 88-micron [OIII] lines and dust-continuum emission. Selection of the40 REBELS targets was done by combining our own and other photometricselections, each of which is subject to extensive vetting using threecompletely independent sets of photometry and template-fitting codes. Buildingon the observational strategy deployed in two pilot programs, we are increasingthe number of massive interstellar medium (ISM) reservoirs known at z>6.5 by~4-5x to >30. In this manuscript, we motivate the observational strategydeployed in the REBELS program and present initial results. Based on the 60.6hours of ALMA observations taken in the first year of the program (November2019 to January 2020), 18 highly significant >~7sigma [CII] lines have alreadybeen discovered, the bulk of which (13/18) also show >~3.3 sigma dust-continuumemission. These newly discovered lines more than triple the number of brightISM-cooling lines known in the z>6.5 universe, such that the number ofALMA-derived redshifts at z>6.5 already rival Lya redshift discoveries. Ananalysis of the completeness of our search results vs. star formation rate(SFR) suggests an ~79% efficiency in scanning for [CII] when the SFR(UV+IR) isin excess of 28 M_sol/yr. These new LP results further demonstrate ALMA'sefficiency as a "redshift machine", particularly in the epoch of reionization.

Reionization Era Bright Emission Line Survey: Selection and Characterization of Luminous Interstellar Medium Reservoirs in the z>6.5 Universe