Lensing-induced structure of submillimeter sources: Implications for the microwave background

Evan Scannapieco, Joseph Silk, Jonathan C. Tan

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We consider the effect of lensing by galaxy clusters on the angular distribution of submillimeter wavelength objects. While lensing does not change the total flux and number counts of submillimeter sources, it can affect the number counts and fluxes of flux-limited samples. Therefore, imposing a flux cut on point sources not only reduces the overall Poisson noise, but imprints the correlations between lensing clusters on the unresolved flux distribution. Using a simple model, we quantify the lensing anisotropy induced in flux-limited samples and compare this to Poisson noise. We find that while the level of induced anisotropies on the scale of the cluster angular correlation length is comparable to Poisson noise for a slowly evolving cluster model, it is negligible for more realistic models of cluster evolution. Thus the removal of point sources is not expected to induce measurable structure in the microwave or far-infrared backgrounds.

Original languageEnglish (US)
Pages (from-to)1-11
Number of pages11
JournalAstrophysical Journal
Issue number1 PART 1
StatePublished - Jan 20 2000
Externally publishedYes


  • Cosmic microwave background
  • Galaxies: clusters: general
  • Gravitational lensing
  • Infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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