The bispectrum of polarized galactic foregrounds

Understand

Understanding the properties of the galactic emission at millimetre wavelengths is important for studies of the cosmic microwave background (CMB).

• In this work we explore the bispectrum, the harmonic equivalent of the three point function, from galactic dust and synchrotron emission.
• We investigate these effects across a broad range of frequencies using the synchrotron dominated S-band Polarization All Sky Survey (SPASS) maps at 2.3 GHz, the Planck satellite maps (30-857 GHz) and dust dominated Infrared Astronomical Satellite (IRAS) maps at 3 THz.
• We measure bispectra of total intensity fields, T, as well as the gradient, E, and curl modes, B, of the polarization field.