@article{0aae6a9fe7a8482faac59a83517b5502,
title = "The Sloan Digital Sky Survey Reverberation Mapping Project: Hα and Hβ Reverberation Measurements from First-year Spectroscopy and Photometry",
abstract = "We present reverberation mapping results from the first year of combined spectroscopic and photometric observations of the Sloan Digital Sky Survey Reverberation Mapping Project. We successfully recover reverberation time delays between the g+i band emission and the broad Hβ emission line for a total of 44 quasars, and for the broad Hα emission line in 18 quasars. Time delays are computed using the JAVELIN and CREAM software and the traditional interpolated cross-correlation function (ICCF): using well-defined criteria, we report measurements of 32 Hβ and 13 Hα lags with JAVELIN, 42 Hβ and 17 Hα lags with CREAM, and 16 Hβ and eight Hα lags with the ICCF. Lag values are generally consistent among the three methods, though we typically measure smaller uncertainties with JAVELIN and CREAM than with the ICCF, given the more physically motivated light curve interpolation and more robust statistical modeling of the former two methods. The median redshift of our Hβ-detected sample of quasars is 0.53, significantly higher than that of the previous reverberation mapping sample. We find that in most objects, the time delay of the Hα emission is consistent with or slightly longer than that of Hβ. We measure black hole masses using our measured time delays and line widths for these quasars. These black hole mass measurements are mostly consistent with expectations based on the local MBH-σ∗ relationship, and are also consistent with single-epoch black hole mass measurements. This work increases the current sample size of reverberation-mapped active galaxies by about two-thirds and represents the first large sample of reverberation mapping observations beyond the local universe (z < 0.3).",
keywords = "galaxies: active, galaxies: nuclei, quasars: emission lines, quasars: general",
author = "Grier, {C. J.} and Trump, {J. R.} and Yue Shen and Keith Horne and Karen Kinemuchi and McGreer, {Ian D.} and Starkey, {D. A.} and Brandt, {W. N.} and Hall, {P. B.} and Kochanek, {C. S.} and Yuguang Chen and Denney, {K. D.} and Greene, {Jenny E.} and Ho, {L. C.} and Y. Homayouni and Li, {Jennifer I.Hsiu} and Liuyi Pei and Peterson, {B. M.} and P. Petitjean and Schneider, {D. P.} and Mouyuan Sun and Yusura Alsayyad and Dmitry Bizyaev and Jonathan Brinkmann and Brownstein, {Joel R.} and Kevin Bundy and Dawson, {K. S.} and Sarah Eftekharzadeh and Fernandez-Trincado, {J. G.} and Yang Gao and Hutchinson, {Timothy A.} and Siyao Jia and Linhua Jiang and Daniel Oravetz and Kaike Pan and Isabelle Paris and Ponder, {Kara A.} and Christina Peters and Jesse Rogerson and Audrey Simmons and Robyn Smith and Wang, {And Ran}",
note = "Funding Information: We thank the Bok and CFHT Canadian, Chinese, and French TACs for their support. This research uses data obtained through the Telescope Access Program (TAP), which is funded by the National Astronomical Observatories, the Chinese Academy of Sciences, and the Special Fund for Astronomy from the Ministry of Finance in China. Funding Information: This work is based on observations obtained with Mega-Prime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada–France–Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l{\textquoteright}Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. The astronomical community is most fortunate to have the opportunity to conduct observations from this mountain. Funding Information: C.J.G., W.N.B., J.R.T., and D.P.S. acknowledge support from NSF grant AST-1517113. Y.S. acknowledges support from an Alfred P. Sloan Research Fellowship and NSF grant AST-1715579. C.S.K. is supported by NSF grant AST-1515427. K.H. acknowledges support from STFC grant ST/ M001296/1. I.D.M. acknowledges support from NSF grant AST 15-15115. K.D.D. acknowledges support from the NSF awarded under NSF Grant AST-1302093. L.C.H. was supported by the National Key R&D Program of China (2016YFA0400702) and the National Science Foundation of China (11473002, 11721303). Funding Information: Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III website ishttp://www.sdss3.org/. Funding Information: C.J.G., W.N.B., J.R.T., and D.P.S. acknowledge support from NSF grant AST-1517113. Y.S. acknowledges support from an Alfred P. Sloan Research Fellowship and NSF grant AST-1715579. C.S.K. is supported by NSF grant AST-1515427. K.H. acknowledges support from STFC grant ST/M001296/1. I.D.M. acknowledges support from NSF grant AST 15-15115. K.D.D. acknowledges support from the NSF awarded under NSF Grant AST-1302093. L.C.H. was supported by the National Key R and D Program of China (2016YFA0400702) and the National Science Foundation of China (11473002, 11721303). Publisher Copyright: {\textcopyright} 2017. The American Astronomical Society. All rights reserved.",
year = "2017",
month = dec,
day = "10",
doi = "10.3847/1538-4357/aa98dc",
language = "English (US)",
volume = "851",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",
}