期刊
ASTROPHYSICAL JOURNAL
卷 761, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/761/1/20
关键词
galaxies: luminosity function, mass function; galaxies: statistics; gravitational lensing: strong; methods: numerical; submillimeter: galaxies
资金
- FQRNT International Internship grant
- Canadian Institute for Advanced Research
- NSERC Discovery
- Canada Research Chairs program
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 intermediatemagnifications (similar to 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.
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