We perform a joint fit to differential number counts from Spitzer's Multiband Imaging Photometer or Spitzer and Herschel's Spectral and Photometric Imaging Receiver (SPIRE) instruments, and angular power spectra of cosmic infrared background (CIB) anisotropies from PIRE, Planck, the Atacama Cosmology Telescope and the South Pole Telescope, which together span 220 ≲ ν/GHz ≲ 4300 (70 λ ≲/μm ≲ 1400). We simultaneously constrain the dust luminosity function, thermal dust spectral energy distribution (SED) and clustering properties of CIB sources, and the evolution of these quantities over cosmic time. We find that the data strongly require redshift evolution in the thermal dust SED. In our adopted parametrization, this evolution takes the form of an increase in greybody dust temperature at high redshift,but it may also be related to a temperature -dust luminosity correlation or evolution in dust pacity. The counts and spectra together constrain the evolution of the thermal dust luminosity function up to z ~ 2.5-3, complementing approaches relying on rest-frame mid-infraredobservations of the rarest bright objects.We are able to fit the power spectra without requiring complex halo model approach, and show that neglecting scale-dependent halo bias may be impairing analyses that do use this framework.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
- Infrared: Diffuse background
- Infrared: Galaxies
- Submillimetre: Diffuse background
- Submillimetre: Galaxies