The Sloan Digital Sky Survey Reverberation Mapping Project : Hα and Hβ reverberation measurements from first-year spectroscopy and photometry
MetadataShow full item record
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 fora 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 dened 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 8 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 andmore robust statistical modeling of the former two methods. The median redshift of our H-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 longerthan 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 basedon 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 thefirst large sample of reverberation mapping observations beyond the local universe (z < 0:3).
Grier , C J , Trump , J R , Shen , Y , Horne , K , Kinemuchi , K , McGreer , I D , Starkey , D A , Brandt , W N , Hall , P B , Kochanek , C S , Chen , Y , Denney , K D , Greene , J E , Ho , L C , Homayouni , Y , Li , J I-H , Pei , L , Peterson , B M , Petitjean , P , Schneider , D P , Sun , M , AlSayyad , Y , Bizyaev , D , Brinkmann , J , Brownstein , J R , Bundy , K , Dawson , K S , Eftekharzadeh , S , Fernandez-Trincado , J G , Gao , Y , Hutchinson , T A , Jia , S , Jiang , L , Oravetz , D , Pan , K , Paris , I , Ponder , K A , Peters , C , Rogerson , J , Simmons , A , Smith , R & Wang , R 2017 , ' The Sloan Digital Sky Survey Reverberation Mapping Project : Hα and Hβ reverberation measurements from first-year spectroscopy and photometry ' Astrophysical Journal .
© 2017, American Astronomical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version.
Funding: UK Sciences and Technology Facilities Council STFC grant ST/M001296/1 (KH).
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.