Abstract
ABSTRACT We present modelling of ∼0.1 arcsec resolution Atacama Large Millimetre/submillimetre Array imaging of seven strong gravitationally lensed galaxies detected by the Herschel Space Observatory. Four of these systems are galaxy–galaxy strong lenses, with the remaining three being group-scale lenses. Through careful modelling of visibilities, we infer the mass profiles of the lensing galaxies and by determining the magnification factors, we investigate the intrinsic properties and morphologies of the lensed submillimetre sources. We find that these submillimetre sources all have ratios of star formation rate to dust mass that are consistent with, or in excess of, the mean ratio for high-redshift submillimetre galaxies and low redshift ultra-luminous infrared galaxies. Reconstructions of the background sources reveal that the majority of our sample display disturbed morphologies. The majority of our lens models have mass density slopes close to isothermal, but some systems show significant differences.
Highlights
Sub-millimetre galaxies (SMGs) play host to some of the most intense star formation rates in the Universe
We present modelling of ∼ 0.1 arcsec resolution Atacama Large Millimetre/sub-millimeter Array imaging of seven strong gravitationally lensed galaxies detected by the Herschel Space Observatory
The image flux fraction refers to the fraction of the total flux in the image plane that these subsets of source plane pixels contribute when they are lensed by our bestfit model
Summary
Sub-millimetre (sub-mm) galaxies (SMGs) (see Casey et al 2014, for a review) play host to some of the most intense star formation rates in the Universe. They are observed to be abundant at redshifts z > 1 and to contribute approximately 20 per cent of the cosmic star formation rate density up to a redshift of z ∼ 4 (Swinbank et al 2013; Lapi et al 2011). Dust grains absorb this radiation, causing them to be heated. This energy is reprocessed and emitted as thermal continuum emission that we can observe in the sub-mm and mm regimes. The study of high-redshift sub-mm galaxies has benefited greatly from the advent of large interferometer arrays such as the Atacalma Large Millimeter/Sub-millimeter Array (ALMA), allowing observations to reach resolutions of < 0.1 arcsec, probing physical scales that were previously unreachable
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