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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/24277
Title: Comparison of weak lensing by NFW and Einasto halos and systematic errors
Authors: Sereno, Mauro 
Fedeli, Cosimo
MOSCARDINI, LAURO
Issue Date: 2016
Journal: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS 
Number: 2016
Issue: 1
First Page: 042
Abstract: Recent N-body simulations have shown that Einasto radial profiles provide the most accurate description of dark matter halos. Predictions based on the traditional NFW functional form may fail to describe the structural properties of cosmic objects at the percent level required by precision cosmology. We computed the systematic errors expected for weak lensing analyses of clusters of galaxies if one wrongly models the lens density profile. Even though the NFW fits of observed tangential shear profiles can be excellent, viral masses and concentrations of very massive halos (gtrsim 10<SUP>15</SUP>M<SUB>solar</SUB>/h) can be over- and underestimated by 0~ 1 per cent, respectively. Misfitting effects also steepen the observed mass-concentration relation, as observed in multi-wavelength observations of galaxy groups and clusters. Based on shear analyses, Einasto and NFW halos can be set apart either with deep observations of exceptionally massive structures (gtrsim 2×10<SUP>15</SUP>M<SUB>solar</SUB>/h) or by stacking the shear profiles of thousands of group-sized lenses (gtrsim 10<SUP>14</SUP>M<SUB>solar</SUB>/h).
URI: http://hdl.handle.net/20.500.12386/24277
URL: https://iopscience.iop.org/article/10.1088/1475-7516/2016/01/042
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2016/01/042
Bibcode ADS: 2016JCAP...01..042S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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JCAP1504.05183.pdfpreprint656.25 kBAdobe PDFView/Open
83_Comparison of weak lensing by NFW and Einasto halos and systematic errors.pdf[Administrators only]742.41 kBAdobe PDFView/Open
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