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The "External" Shears In Strong Lens Models.
- Source :
-
Proceedings of the International Astronomical Union . Dec2022, Vol. 18 Issue S381, p13-16. 4p. - Publication Year :
- 2022
-
Abstract
- The distribution of mass in galaxy-scale strong gravitational lenses is often modelled as an elliptical power law plus 'external shear', which notionally accounts for line-of-sight galaxies and cosmic shear. We argue that it does not, using three lines of evidence from the analysis of 54 galaxy-scale strong lenses: (i) strong lensing external shears do not correlate with weak lensing; (ii) the measured shear magnitudes in strong lenses (which are field galaxies) are too large (exceeding 0.05) for their environment and; (iii) the external shear position angle preferentially aligns or anti-aligns with the mass model position angle, indicating an internal origin. We argue the measured strong lensing shears are therefore systematically accounting for missing complexity in the canonical elliptical power-law mass model. If we can introduce this complexity into our lens models, this will further lensing studies of galaxy formation, dark matter and Cosmology. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GRAVITATIONAL lenses
*DARK matter
*GALAXIES
*PHYSICAL cosmology
Subjects
Details
- Language :
- English
- ISSN :
- 17439213
- Volume :
- 18
- Issue :
- S381
- Database :
- Academic Search Index
- Journal :
- Proceedings of the International Astronomical Union
- Publication Type :
- Academic Journal
- Accession number :
- 175798992
- Full Text :
- https://doi.org/10.1017/S1743921323003691