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We present reverberation-mapping lags and black-hole mass measurements usingthe CIV 1549 broad emission line from a sample of 349 quasars monitored as apart of the Sloan Digital Sky Survey Reverberation Mapping Project. Our dataspan four years of spectroscopic and photometric monitoring for a totalbaseline of 1300 days. We report significant time delays between the continuumand the CIV 1549 emission line in 52 quasars, with an estimated false-positivedetection rate of 10%. Our analysis of marginal lag measurements indicates thatthere are on the order of 100 additional lags that should be recoverable byadding more years of data from the program. We use our measurements tocalculate black-hole masses and fit an updated CIV radius-luminosityrelationship. Our results significantly increase the sample of quasars with CIVRM results, with the quasars spanning two orders of magnitude in luminositytoward the high-luminosity end of the CIV radius-luminosity relation. Inaddition, these quasars are located at among the highest redshifts (z~1.4-2.8)of quasars with black hole masses measured with reverberation mapping. Thiswork constitutes the first large sample of CIV reverberation-mappingmeasurements in more than a dozen quasars, demonstrating the utility ofmulti-object reverberation mapping campaigns.

The Sloan Digital Sky Survey Reverberation Mapping Project: Initial CIV Lag Results from Four Years of Data