2022

Spectroastrometry and Reverberation Mapping: the Mass and Geometric Distance of the Supermassive Black Hole in the Quasar 3C 273

Li, Yan-Rong, Wang, Jian-Min, Songsheng, Yu-Yang et al.

Understand

The quasar 3C 273 has been observed with infrared spectroastrometry (SA) on broad Pa$\alpha$ line and optical reverberation mapping (RM) on broad H$\beta$ line.

  • SA delivers information about the angular size and structure of the Pa$\alpha$ broad-line region (BLR), while RM delivers information about the physical size and structure of the H$\beta$ BLR.
  • Based on the fact that the two BLRs share the mass of the supermassive black hole (SMBH) and viewing inclination, a combination of SA and velocity-resolved RM (SARM) thereby allows us to simultaneously determine the SMBH mass and geometric distance through dynamically modeling the two BLRs.
  • We construct a suite of dynamical models with different geometric configurations and apply a Bayesian approach to obtain the parameter inferences.

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