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26 April 2024 |
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Article overview
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Strong-Lensing Analysis of MS 1358.4+6245: New Multiple Images and Implications for the Well-Resolved z=4.92 Galaxy | | Adi Zitrin
; Tom Broadhurst
; Dan Coe
; Jori Liesenborgs
; Narciso Benitez
; Yoel Rephaeli
; Holland Ford
; Keiichi Umetsu
; | | Date: |
20 Sep 2010 | | Abstract: | We present a strong-lensing analysis of the galaxy cluster MS 1358.4+6245
($z=0.33$), in deep 6-band ACS/HST imaging. In addition to the well-studied
system at $z=4.92$, our modelling method uncovers 19 new multiply-lensed images
so that a total of 23 images and their redshifts are used to accurately
constrain the inner mass distribution. We derive a relatively shallow inner
mass profile, $dlog Sigma/dlog rsimeq -0.33 pm0.05$ ($r<200$ kpc), with a
much higher magnification than estimated previously by models constrained only
by the $z=4.92$ system. Using these many new images we can apply a
non-parametric adaptive-grid method, which also yields a shallow mass profile
without prior assumptions, strengthening our conclusions. The total
magnification of the $z_s=4.92$ galaxy is high, about a $sim100 imes$ over
its four images, so that the inferred source size, luminosity and
star-formation rate are about $sim5 imes$ smaller than previous estimates,
corresponding to a dwarf-sized galaxy of radius $simeq1$ kpc. A detailed image
of the interior morphology of the source is generated with a high effective
resolution of only $simeq$50 pc, thanks to the high magnification and to the
declining angular diameter distance above $zsim1.5$ for the standard
cosmology, so that this image apparently represents the best resolved object
known at high redshift. | | Source: | arXiv, 1009.3936 | | Services: | Forum | Review | PDF | Favorites | |
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