The Sloan Digital Sky Survey Reverberation Mapping Project: MgII Lag Results from Four Years of Monitoring. (arXiv:2005.03663v1 [astro-ph.GA])

The Sloan Digital Sky Survey Reverberation Mapping Project: MgII Lag Results from Four Years of Monitoring. (arXiv:2005.03663v1 [astro-ph.GA])
<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:+Trump_J/0/1/0/all/0/1">Jonathan R. Trump</a>, <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:+Horne_K/0/1/0/all/0/1">Keith Horne</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:+Brandt_W/0/1/0/all/0/1">W. N. Brandt</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dawson_K/0/1/0/all/0/1">Kyle S. Dawson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Alvarez_G/0/1/0/all/0/1">Gloria Fonseca Alvarez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Green_P/0/1/0/all/0/1">Paul Green</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hall_P/0/1/0/all/0/1">P. B. Hall</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Santisteban_J/0/1/0/all/0/1">Juan V. Hernandez Santisteban</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ho_L/0/1/0/all/0/1">Luis C. Ho</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kinemuchi_K/0/1/0/all/0/1">Karen Kinemuchi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kochanek_C/0/1/0/all/0/1">C. S. Kochanek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Li_J/0/1/0/all/0/1">Jennifer I-Hsiu Li</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:+Schneider_D/0/1/0/all/0/1">D. P. Schneider</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Starkey_D/0/1/0/all/0/1">D. A. Starkey</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:+Pan_K/0/1/0/all/0/1">Kaike Pan</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:+Simmons_A/0/1/0/all/0/1">Audrey Simmons</a>

We present reverberation mapping results for the MgII 2800 A broad emission
line in a sample of 193 quasars at 0.35<z<1.7 with photometric and
spectroscopic monitoring observations from the Sloan Digital Sky Survey
Reverberation Mapping project during 2014 – 2017. We find significant time lags
between the MgII and continuum lightcurves for 57 quasars and define a “gold
sample” of 24 quasars with the most reliable lag measurements. We estimate
false-positive rates for each lag that range from 1-24%, with an average
false-positive rate of 11% for the full sample and 8% for the gold sample.
There are an additional ~40 quasars with marginal MgII lag detections which may
yield reliable lags after additional years of monitoring. The MgII lags follow
a radius — luminosity relation with a best-fit slope that is consistent with
alpha=0.5 but with an intrinsic scatter of 0.36dex that is significantly larger
than found for the Hb radius — luminosity relation. For targets with SDSS-RM
lag measurements of other emission lines, we find that our MgII lags are
similar to the Hb lags and ~2-3 times larger than the CIV lags. This work
significantly increases the number of MgII broad-line lags and provides
additional reverberation-mapped black hole masses, filling the redshift gap at
the peak of supermassive black hole growth between the Hb and CIV emission
lines in optical spectroscopy.

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