A geometrically supported z∼ 10 candidate multiply imaged by the Hubble Frontier Fields cluster A2744 Academic Article uri icon

abstract

  • The deflection angles of lensed sources increase with their distance behind a given lens. We utilize this geometric effect to corroborate the z phot sime 9.8 photometric redshift estimate of a faint near-IR dropout, triply imaged by the massive galaxy cluster A2744 in deep Hubble Frontier Fields images. The multiple images of this source follow the same symmetry as other nearby sets of multiple images that bracket the critical curves and have well-defined redshifts (up to z spec sime 3.6), but with larger deflection angles, indicating that this source must lie at a higher redshift. Similarly, our different parametric and non- parametric lens models all require this object be at z gsim 4, with at least 95% confidence, thoroughly excluding the possibility of lower-redshift interlopers. To study the properties of this source, we correct the two brighter images for their magnifications, leading to a star …

publication date

  • September 4, 2014