The Sloan Digital Sky Survey Reverberation Mapping Project: Initial CIV Lag Results from Four Years of Data. (arXiv:1904.03199v1 [astro-ph.GA])

The Sloan Digital Sky Survey Reverberation Mapping Project: Initial CIV Lag Results from Four Years of Data. (arXiv:1904.03199v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Grier_C/0/1/0/all/0/1">C. J. Grier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shen_Y/0/1/0/all/0/1">Yue Shen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Horne_K/0/1/0/all/0/1">Keith Horne</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brandt_W/0/1/0/all/0/1">W. N. Brandt</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Trump_J/0/1/0/all/0/1">J. R. Trump</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kinemuchi_K/0/1/0/all/0/1">K. Kinemuchi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Schneider_D/0/1/0/all/0/1">D. P. Schneider</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Homayouni_Y/0/1/0/all/0/1">Y. Homayouni</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+McGreer_I/0/1/0/all/0/1">Ian D. McGreer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Peterson_B/0/1/0/all/0/1">B. M. Peterson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bizyaev_D/0/1/0/all/0/1">Dmitry Bizyaev</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chen_Y/0/1/0/all/0/1">Yuguang Chen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dawson_K/0/1/0/all/0/1">K. S. Dawson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Eftekharzadeh_S/0/1/0/all/0/1">Sarah Eftekharzadeh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kneib_J/0/1/0/all/0/1">Jean-Paul Kneib</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nie_J/0/1/0/all/0/1">Jundan Nie</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Oravetz_A/0/1/0/all/0/1">Audrey Oravetz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Oravetz_D/0/1/0/all/0/1">Daniel Oravetz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pan_K/0/1/0/all/0/1">Kaike Pan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Petitjean_P/0/1/0/all/0/1">Patrick Petitjean</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vivek_M/0/1/0/all/0/1">M. Vivek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zou_H/0/1/0/all/0/1">Hu Zou</a>

We present reverberation-mapping lags and black-hole mass measurements using
the CIV 1549 broad emission line from a sample of 349 quasars monitored as a
part of the Sloan Digital Sky Survey Reverberation Mapping Project. Our data
span four years of spectroscopic and photometric monitoring for a total
baseline of 1300 days. We report significant time delays between the continuum
and the CIV 1549 emission line in 52 quasars, with an estimated false-positive
detection rate of 10%. Our analysis of marginal lag measurements indicates that
there are on the order of 100 additional lags that should be recoverable by
adding more years of data from SDSS-RM. We use our measurements to calculate
black-hole masses and fit an updated CIV radius-luminosity relationship. Our
results significantly increase the sample of quasars with CIV RM results, with
the quasars spanning two orders of magnitude in luminosity toward the
high-luminosity end of the CIV radius-luminosity relation. In addition, these
quasars are located at among the highest redshifts (z~1.4-2.8) of quasars with
black hole masses measured with reverberation mapping. This work constitutes
the first large sample of CIV reverberation-mapping measurements in more than a
dozen quasars, demonstrating the utility of multi-object reverberation mapping
campaigns.

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