Reverberation-mapping of distant quasars: time-lag determination using different methods

Abstract

By applying different statistically robust methods, we analyze the time-lag between the continuum and ionized line-emission (Mg II line) light curves for the distant bright quasar CTS C$30.10$ (redshift $z\sim 0.9$). The data were obtained by the 10-meter SALT telescope in South Africa. In detail, we demonstrate the application of several methods using interpolated cross-correlation function (ICCF), discrete correlation function (DCF), z-transformed discrete correlation function (zDCF), von Neumann estimator, and the JAVELIN code package. In particular, we discuss the uncertainties of these methods. In conclusion, we find that the quasar lies on the broad-line region (BLR) size -- monochromatic luminosity power-law scaling, $R_{\mathrm{BLR}}\propto L_{5100}^{1/2}$, which was already confirmed for low-redshift sources. In case the BLR size-luminosity relation holds for other distant sources, quasars could be used for probing cosmological models as ``standard candles'' complementary to supernovae Ia.

arXiv comment9 pages, 5 figures, 2 tables; to appear in Astronomical Notes as a contribution presented at the IBWS 2019 conference (Karlovy Vary, Czechia, 20 - 24 May 2019)

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• Current and future applications of Reverberation-mapped quasars in Cosmology
• Standardizing reverberation-measured C IV time-lag quasars, and using them with standardized Mg II quasars to constrain cosmological parameters
• Do reverberation-measured H$\beta$ quasars provide a useful test of cosmology?
• Scatter Analysis Along the Multidimensional Radius-Luminosity Relations for Reverberation-Mapped Mg II Sources
• BLR size in Realistic FRADO Model: The role of shielding effect
• UV Fe II emission model of HE 0413-4031 and its relation to broad-line time delays
• Standardizing reverberation-measured Mg II time-lag quasars, by using the radius-luminosity relation, and constraining cosmological model parameters
• Time domain astrophysics with transient sources. Delay estimate via Cross Correlation Function techniques