Further support for a trio of mass-to-light deviations in Abell 370: free-form grale lens inversion using BUFFALO strong lensing data
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Further support for a trio of mass-to-light deviations in Abell 370 : free-form grale lens inversion using BUFFALO strong lensing data. / Ghosh, Agniva; Williams, Liliya L. R.; Liesenborgs, Jori; Acebron, Ana; Jauzac, Mathilde; Koekemoer, Anton M.; Mahler, Guillaume; Niemiec, Anna; Steinhardt, Charles; Faisst, Andreas L.; Lagattuta, David; Natarajan, Priyamvada.
I: Monthly Notices of the Royal Astronomical Society, Bind 506, Nr. 4, 04.10.2021, s. 6144-6158.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Further support for a trio of mass-to-light deviations in Abell 370
T2 - free-form grale lens inversion using BUFFALO strong lensing data
AU - Ghosh, Agniva
AU - Williams, Liliya L. R.
AU - Liesenborgs, Jori
AU - Acebron, Ana
AU - Jauzac, Mathilde
AU - Koekemoer, Anton M.
AU - Mahler, Guillaume
AU - Niemiec, Anna
AU - Steinhardt, Charles
AU - Faisst, Andreas L.
AU - Lagattuta, David
AU - Natarajan, Priyamvada
N1 - Erratum: to DOI: 10.1093/mnras/stab2096
PY - 2021/10/4
Y1 - 2021/10/4
N2 - We use the Beyond Ultra-deep Frontier Fields and Legacy Observations (BUFFALO) strong lensing image catalogue of the merging galaxy cluster Abell 370 to obtain a mass model using free-form lens inversion algorithm grale. The improvement of the strong lensing data quality results in a lens plane rms of only 0.45 arcsec, about a factor of two lower than that of our existing HFF v4 reconstruction. We attribute the improvement to spectroscopic data and use of the full reprocessed HST mosaics. In our reconstructed mass model, we found indications of three distinct mass features in Abell 370: (i) a similar to 35 kpc offset between the northern BCG and the nearest mass peak, (ii) a similar to 100 kpc mass concentration of roughly critical density similar to 250 kpc east of the main cluster, and (iii) a probable filament-like structure passing N-S through the cluster. While (i) is present in some form in most publicly available reconstructions spanning the range of modelling techniques: parametric, hybrid, and free-form, (ii) and (iii) are recovered by only about half of the reconstructions. We tested our hypothesis on the presence of the filament-like structure by creating a synthetic cluster - Irtysh IIIc - mocking the situation of a cluster with external mass. We also computed the source plane magnification distributions. Using them, we estimated the probabilities of magnifications in the source plane, and scrutinized their redshift dependence. Finally, we explored the lensing effects of Abell 370 on the luminosity functions of sources at z(s) = 9.0, finding it consistent with published results.
AB - We use the Beyond Ultra-deep Frontier Fields and Legacy Observations (BUFFALO) strong lensing image catalogue of the merging galaxy cluster Abell 370 to obtain a mass model using free-form lens inversion algorithm grale. The improvement of the strong lensing data quality results in a lens plane rms of only 0.45 arcsec, about a factor of two lower than that of our existing HFF v4 reconstruction. We attribute the improvement to spectroscopic data and use of the full reprocessed HST mosaics. In our reconstructed mass model, we found indications of three distinct mass features in Abell 370: (i) a similar to 35 kpc offset between the northern BCG and the nearest mass peak, (ii) a similar to 100 kpc mass concentration of roughly critical density similar to 250 kpc east of the main cluster, and (iii) a probable filament-like structure passing N-S through the cluster. While (i) is present in some form in most publicly available reconstructions spanning the range of modelling techniques: parametric, hybrid, and free-form, (ii) and (iii) are recovered by only about half of the reconstructions. We tested our hypothesis on the presence of the filament-like structure by creating a synthetic cluster - Irtysh IIIc - mocking the situation of a cluster with external mass. We also computed the source plane magnification distributions. Using them, we estimated the probabilities of magnifications in the source plane, and scrutinized their redshift dependence. Finally, we explored the lensing effects of Abell 370 on the luminosity functions of sources at z(s) = 9.0, finding it consistent with published results.
KW - gravitational lensing: strong
KW - galaxies: clusters: individual: Abell 370
KW - HUBBLE-FRONTIER-FIELDS
KW - LUMINOSITY FUNCTION
KW - DISTANT CLUSTER
KW - NONPARAMETRIC INVERSION
KW - DARK-MATTER
KW - GALAXIES
KW - MAGNIFICATION
KW - DISTRIBUTIONS
KW - DEGENERACIES
KW - MODELS
U2 - 10.1093/mnras/stab1196
DO - 10.1093/mnras/stab1196
M3 - Journal article
VL - 506
SP - 6144
EP - 6158
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 4
ER -
ID: 282472412