Weak Lensing
Our pre-measured weak gravitational lensing shear catalogue is not publicly available, because subtleties in the measurement of shears, photometry and photometric redshifts must be carefully considered to maintain quality control. However, we are very happy to collaborate with people wanting to use the catalogue, and can work with you to optimise its use. If you would like to work with us, please contact Alexie Leauthaud, Richard Massey and Jason Rhodes.
However, we have released high-level data products and various low-level software tools that grew out of our precision lensing analysis but may be useful for generic HST image processing.
- 2D and 3D mass maps showing the distribution of dark matter in the COSMOS field. These are available in a range of file formats for astronomers or graphic artists.
- Cosmic shear 3D correlation functions and covariance matrices. This also includes a module for CosmoMC, to quickly include weak lensing data in measurements of cosmological parameters.
- Cut-out images of galaxies and other other auxiliary data associated with the SHERA software package, which uses HST COSMOS images to simulate ground-based observations.
- Models of the ACS/WFC F814W point spread function, from both TinyTim and stars in the COSMOS imaging. As HST passes in and out of shadow, it goes slightly in and out of focus. Similar models in other bands are available from on request.
- Algorithm to correct Charge Transfer Inefficiency in ACS/WFC images. Above the protection of the Earth's atmosphere, HST's sensitive electronics are gradually damaged by radiation. Atoms are occasionally knocked out of the detector's silicon wafers, and the defects cause image blurring during readout. This process can be modelled, and corrected in post-processing software.
