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Stacked reverberation mapping.

Fine, S. and Shanks, T. and Green, P. and Kelly, B.C. and Croom, S.M. and Webster, R.L. and Berger, E. and Chornock, R. and Burgett, W.S. and Chambers, K.C. and Kaiser, N. and Price, P.A. (2013) 'Stacked reverberation mapping.', Monthly notices of the Royal Astronomical Society : letters., 434 (1). L16-L20.


Over the past 20 years reverberation mapping has proved one of the most successful techniques for studying the local (<1 pc) environment of supermassive black holes that drive active galactic nuclei. Key successes of reverberation mapping have been direct black hole mass estimates, the radius–luminosity relation for the Hβ line and the calibration of single-epoch mass estimators commonly employed up to z ∼ 7. However, observing constraints mean that few studies have been successful at z > 0.1, or for the more-luminous quasars that make up the majority of current spectroscopic samples, or for rest-frame ultraviolet emission lines available in optical spectra of z > 0.5 objects. Previously, we described a technique for stacking cross-correlations to obtain reverberation mapping results at high z. Here, we present the first results from a campaign designed for this purpose. We construct stacked cross-correlation functions for the C IV and Mg II lines and find a clear peak in both. We find that the peak in the Mg II correlation is at longer lags than C IV consistent with previous results at low redshift. For the C IV sample, we are able to bin by luminosity and find evidence for increasing lags for more-luminous objects. This C IV radius–luminosity relation is consistent with previous studies but with a fraction of the observational cost.

Item Type:Article
Keywords:Galaxies: active, Quasars: emission lines, Quasars: general, Galaxies: Seyfert.
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Letters. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:No date available
Date deposited:06 June 2014
Date of first online publication:September 2013
Date first made open access:No date available

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