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We present the first results from CECILIA, a Cycle 1 JWST NIRSpec/MSA programthat uses ultra-deep ~30 hour G235M/F170LP observations to target multipleelectron temperature-sensitive auroral lines in the spectra of 33 galaxies atz~1-3. Using a subset of 23 galaxies, we construct two ~600 object-hourcomposite spectra, both with and without the stellar continuum, and use theseto investigate the characteristic rest-optical (5700-8500 Angstrom) spectrum ofstar-forming galaxies at the peak epoch of cosmic star formation. Emissionlines of eight different elements (H, He, N, O, Si, S, Ar, and Ni) aredetected, with most of these features observed to be <3% the strength ofH-alpha. We report the characteristic strength of three auroral lines([NII]5756, [SIII]6313, and [OII]7322,7332), as well as other semi-strong andfaint emission lines, including forbidden [NiII]7380,7414 and the OI 8449recombination line, some of which have never before been observed outside ofthe local universe. Using these measurements, we find T_e[NII]=13630+/-2540$ K,representing the first measurement of electron temperature using [NII] in thehigh-redshift universe. We also see evidence for broad line emission with aFWHM of ~544 km/s; the broad component of H-alpha is 6.01-28.31% the strengthof the narrow component and likely arises from star-formation driven outflows.Finally, we briefly comment on the feasibility of obtaining large samples offaint emission lines using JWST in the future.

CECILIA: The Faint Emission Line Spectrum of z~2-3 Star-forming Galaxies