Reverberation mapping (RM) is an ecient method to investigate the physical sizes of the broad line region (BLR) and dusty torus in an active galactic nucleus (AGN). The Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer (SPHEREx) mission will provide multi-epoch spectroscopic data at optical and near-infrared wavelengths. These data can be used for RM experiments with bright AGNs. We present results of a feasibility test using SPHEREx data in the SPHEREx deep regions for torus RM measurements. We investigate the physical properties of bright AGNs in the SPHEREx deep eld. Based on this information, we compute the eciency of detecting torus time lags in simulated light curves. We demonstrate that, in combination with complementary optical data with a depth of  20 mag in B􀀀band, lags of  750 days for tori can be measured for more than  200 bright AGNs. If high signal-to-noise ratio photometric data with a depth of  21{22 mag are available, RM measurements are possible for up to  900 objects. When complemented by well-designed early optical observations, SPHEREx can provide a unique dataset for studies of the physical properties of dusty tori in bright AGNs.

Introduction
Sample Characteristics
Simulations
Results
Complementary Optical Observations
Conclusions
Acknowledgments
References

• Minjin Kim(Department of Astronomy and Atmospheric Sciences, College of Natural Sciences, Kyungpook National University, Daegu 41566, Korea) Corresponding author
• Woong-Seob Jeong(Korea Astronomy and Space Science Institute, Daejeon 34055, Korea, University of Science and Technology, Daejeon 34113, Korea)
• Yujin Yang(Korea Astronomy and Space Science Institute, Daejeon 34055, Korea, University of Science and Technology, Daejeon 34113, Korea)
• Jiwon Son(Department of Astronomy and Atmospheric Sciences, College of Natural Sciences, Kyungpook National University, Daegu 41566, Korea)
• Luis C. Ho(Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China, Department of Astronomy, School of Physics, Peking University, Beijing 100871, China)
• Jong-Hak Woo(Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 08826, SNU Astronomy Research Center, Seoul National University, Seoul 08826, KoreaKorea,)
• Myungshin Im(Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 08826, SNU Astronomy Research Center, Seoul National University, Seoul 08826, KoreaKorea,)
• Woowon Byun(Korea Astronomy and Space Science Institute, Daejeon 34055, Korea, University of Science and Technology, Daejeon 34113, Korea)