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Subaru FOCAS IFU observations of two z=0.12 strong-lensing elliptical galaxies from SDSS MaNGA | | Russell J. Smith
; William P. Collier
; Shinobu Ozaki
; John R. Lucey
; | | Date: |
14 Nov 2019 | | Abstract: | We present new observations of two z=0.12 strong-lensing elliptical galaxies,
originally discovered from the SDSS-IV MaNGA survey, using the new FOCAS IFU
spectrograph on the Subaru Telescope. For J1436+4943, our observations confirm
the identification of this system as a multiple-image lens, in a cusp
configuration, with Einstein radius $ heta_{Ein}$=2.0 arcsec. For J1701+3722,
the improved data confirm earlier hints of a complex source plane, with
different configurations evident in different emission lines. The new
observations reveal a previously unseen inner counter-image to the [OIII] arc
found from MaNGA, leading to a smaller revised Einstein radius of
$ heta_{Ein}$=1.6 arcsec. The inferred projected masses within the Einstein
apertures (3.7-4.7kpc) are consistent with being dominated by stars with an
initial mass function (IMF) similar to that of the Milky Way, and a dark matter
contribution of ~35 per cent as supported from cosmological simulations. These
results are consistent with ’pure lensing’ analyses of lower-redshift lenses,
but contrast with claims for heavier IMFs from combined lensing-and-dynamical
studies of more distant early-type galaxies. | | Source: | arXiv, 1911.6338 | | Services: | Forum | Review | PDF | Favorites | |
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