Probing the CIV continuum size luminosity relation in active galactic nuclei with photometric reverberation mapping
arxiv(2024)
摘要
Reverberation mapping accurately determines virial black hole masses only for
redshifts z < 0.2 by utilizing the relationship between the Hβ
broad-line region (BLR) size and the 5100 Angstroms continuum luminosity
established with ∼ 200 active galactic nuclei (AGN). For quasars at z
∼ 2-3 determining the BLR size is time-consuming and limited by seasonal
gaps, requiring e.g., ∼ 20 years of monitoring of the CIV emission lines.
In this work, we demonstrate that an efficient alternative is to use a
continuum size-luminosity relation, which can be obtained up to 150 times
faster than BLR sizes using photometric reverberation mapping (PRM). We outline
the method and its feasibility based on simulations and propose an
observational strategy that can be carried out with meter-class telescopes. In
particular, we focus on the ESO La Silla 2.2 meter telescope as it is suitable
for an efficient PRM campaign. These observations will provide the scaling
factor between the accretion disk and the BLR size (for CIV-1350 Angstroms),
which is crucial for estimating the masses of black holes at higher redshifts
(z ≳ 2-3).
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