Hong-Sheng Zhang

Second-order multipole response of two nearby incoherent sources in wave-optical imaging of a Schwarzschild black hole

We study wave-optical imaging of two nearby, mutually incoherent point sources by a Schwarzschild black hole. Using the spherical-harmonic addition theorem, we construct partial-wave fields for arbitrary source directions and form images through a finite-aperture Fourier transform. To isolate the binary structure, we c...