Size bias and differential lensing of strongly lensed, dusty galaxies identified in wide-field surveys

Yashar D. Hezaveh, Daniel P. Marrone, Gilbert P. Holder

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

We address two selection effects that operate on samples of gravitationally lensed dusty galaxies identified in millimeter- and submillimeter-wavelength surveys. First, we point out the existence of a "size bias" in such samples: due to finite source effects, sources with higher observed fluxes are increasingly biased toward more compact objects. Second, we examine the effect of differential lensing in individual lens systems by modeling each source as a compact core embedded in an extended diffuse halo. Considering the ratio of magnifications in these two components, we find that at high overall magnifications, the compact component is amplified by a much larger factor than the diffuse component, but at intermediate magnifications (∼10) the probability of a larger magnification for the extended region is higher. Lens models determined from multi-frequency resolved imaging data are crucial to correct for this effect.

Original languageEnglish (US)
Article number20
JournalAstrophysical Journal
Volume761
Issue number1
DOIs
StatePublished - Dec 10 2012

Keywords

  • galaxies: luminosity function mass function
  • galaxies: statistics
  • gravitational lensing: strong
  • methods: numerical
  • submillimeter: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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