Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys
<p>The intrinsic alignment of galaxy shapes (by means of their angular momentum) and their cross-correlation with the surrounding dark matter tidal field are investigated using the 160 000, <em>z</em> = 1.2 synthetic galaxies extracted from the high-resolution cosmological hydrody...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Journal article |
| Published: |
Oxford University Press
2015
|
| _version_ | 1797080278851649536 |
|---|---|
| author | Codis, S Gavazzi, R Dubois, Y Pichon, C Benabed, K Desjacques, V Pogosyan, D Devriendt, J Slyz, A |
| author_facet | Codis, S Gavazzi, R Dubois, Y Pichon, C Benabed, K Desjacques, V Pogosyan, D Devriendt, J Slyz, A |
| author_sort | Codis, S |
| collection | OXFORD |
| description | <p>The intrinsic alignment of galaxy shapes (by means of their angular momentum) and their cross-correlation with the surrounding dark matter tidal field are investigated using the 160 000, <em>z</em> = 1.2 synthetic galaxies extracted from the high-resolution cosmological hydrodynamical simulation HORIZON-AGN. One- and two-point statistics of the spin of the stellar component are measured as a function of mass and colour. For the low-mass galaxies, this spin is <em>locally</em> aligned with the tidal field ‘filamentary’ direction while, for the high-mass galaxies, it is <em>perpendicular</em> to both filaments and walls. The bluest galaxies of our synthetic catalogue are more strongly correlated with the surrounding tidal field than the reddest galaxies, and this correlation extends up to ∼10 <em>h</em><sup>− 1</sup> Mpc comoving distance. We also report a correlation of the projected ellipticities of blue, intermediate-mass galaxies on a similar scale at a level of 10<sup>−4</sup> which could be a concern for cosmic shear measurements. We do not report any measurable intrinsic alignments of the reddest galaxies of our sample. This work is a first step towards the use of very realistic catalogue of synthetic galaxies to evaluate the contamination of weak lensing measurement by the intrinsic galactic alignments.</p> |
| first_indexed | 2024-03-07T00:57:42Z |
| format | Journal article |
| id | oxford-uuid:88a5c9d8-3a6a-4d2d-8648-dccbe39aca09 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T00:57:42Z |
| publishDate | 2015 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:88a5c9d8-3a6a-4d2d-8648-dccbe39aca092022-03-26T22:18:49Z Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:88a5c9d8-3a6a-4d2d-8648-dccbe39aca09Symplectic Elements at OxfordOxford University Press2015Codis, SGavazzi, RDubois, YPichon, CBenabed, KDesjacques, VPogosyan, DDevriendt, JSlyz, A <p>The intrinsic alignment of galaxy shapes (by means of their angular momentum) and their cross-correlation with the surrounding dark matter tidal field are investigated using the 160 000, <em>z</em> = 1.2 synthetic galaxies extracted from the high-resolution cosmological hydrodynamical simulation HORIZON-AGN. One- and two-point statistics of the spin of the stellar component are measured as a function of mass and colour. For the low-mass galaxies, this spin is <em>locally</em> aligned with the tidal field ‘filamentary’ direction while, for the high-mass galaxies, it is <em>perpendicular</em> to both filaments and walls. The bluest galaxies of our synthetic catalogue are more strongly correlated with the surrounding tidal field than the reddest galaxies, and this correlation extends up to ∼10 <em>h</em><sup>− 1</sup> Mpc comoving distance. We also report a correlation of the projected ellipticities of blue, intermediate-mass galaxies on a similar scale at a level of 10<sup>−4</sup> which could be a concern for cosmic shear measurements. We do not report any measurable intrinsic alignments of the reddest galaxies of our sample. This work is a first step towards the use of very realistic catalogue of synthetic galaxies to evaluate the contamination of weak lensing measurement by the intrinsic galactic alignments.</p> |
| spellingShingle | Codis, S Gavazzi, R Dubois, Y Pichon, C Benabed, K Desjacques, V Pogosyan, D Devriendt, J Slyz, A Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys |
| title |
Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys
|
| title_full |
Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys
|
| title_fullStr |
Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys
|
| title_full_unstemmed |
Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys
|
| title_short |
Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys
|
| title_sort | intrinsic alignment of simulated galaxies in the cosmic web implications for weak lensing surveys |
| work_keys_str_mv | AT codiss intrinsicalignmentofsimulatedgalaxiesinthecosmicwebimplicationsforweaklensingsurveys AT gavazzir intrinsicalignmentofsimulatedgalaxiesinthecosmicwebimplicationsforweaklensingsurveys AT duboisy intrinsicalignmentofsimulatedgalaxiesinthecosmicwebimplicationsforweaklensingsurveys AT pichonc intrinsicalignmentofsimulatedgalaxiesinthecosmicwebimplicationsforweaklensingsurveys AT benabedk intrinsicalignmentofsimulatedgalaxiesinthecosmicwebimplicationsforweaklensingsurveys AT desjacquesv intrinsicalignmentofsimulatedgalaxiesinthecosmicwebimplicationsforweaklensingsurveys AT pogosyand intrinsicalignmentofsimulatedgalaxiesinthecosmicwebimplicationsforweaklensingsurveys AT devriendtj intrinsicalignmentofsimulatedgalaxiesinthecosmicwebimplicationsforweaklensingsurveys AT slyza intrinsicalignmentofsimulatedgalaxiesinthecosmicwebimplicationsforweaklensingsurveys |