A cross-correlation analysis of CMB lensing and radio galaxy maps

Understand

We investigate the origin of the large clustering signal detected in the angular distribution of the radio sources in the TGSS catalog.

• To do so, we cross-correlate the angular position of the radio sources with the Cosmic Microwave Background (CMB) lensing maps from the Planck satellite, since cross-correlation is expected to be insensitive to source of possible systematic errors that may generate a spurious clustering signal.
• The amplitude of the angular cross-correlation spectrum of TGSS-CMB lensing turns out to be much smaller than that of the TGSS auto-spectrum and consistent with that of the NVSS-CMB lensing cross spectrum.
• A result that confirms the spurious origin of the TGSS large scale clustering signal.