A versatile tool for cluster lensing source reconstruction. I. methodology and illustration on sources in the Hubble Frontier Field Cluster MACS J0717.5+3745. (arXiv:2001.07719v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Yang_L/0/1/0/all/0/1">Lilan Yang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Birrer_S/0/1/0/all/0/1">Simon Birrer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Treu_T/0/1/0/all/0/1">Tommaso Treu</a>
We describe a general purpose method to reconstruct the intrinsic properties
of sources lensed by the gravitational potential of foreground clusters of
galaxies. The tool Lenstruction is implemented in the publicly available
multi-purpose gravitational lensing software Lenstronomy, in order to provide
easy and fast solution to this common astrophysical problem. The tool is based
on forward modeling the appearance of the source in the image plane, taking
into account the distortion by lensing and the instrumental point spread
function (PSF). For singly-imaged sources a global lens model in the format of
the Hubble Frontier Fields (HFF) lensing maps is required as a starting point.
For multiply-imaged sources, the tool can also fit and apply first (deflection)
second (shear, convergence) and third order (flexion) corrections to the local
gravitational potential to improve the overall reconstruction, depending on the
quality of the data. We illustrate the performance and features of the code
with two examples of multiply-imaged systems taken from the Hubble Frontier
Fields, starting from five different publicly available cluster models. We find
that, after our correction, the relative magnification – and other lensing
properties – between the multiple images become robustly constrained.
Furthermore, we find that scatter between models of the reconstructed source
size and magnitude is reduced. The code and jupyter notebooks are publicly
available.
We describe a general purpose method to reconstruct the intrinsic properties
of sources lensed by the gravitational potential of foreground clusters of
galaxies. The tool Lenstruction is implemented in the publicly available
multi-purpose gravitational lensing software Lenstronomy, in order to provide
easy and fast solution to this common astrophysical problem. The tool is based
on forward modeling the appearance of the source in the image plane, taking
into account the distortion by lensing and the instrumental point spread
function (PSF). For singly-imaged sources a global lens model in the format of
the Hubble Frontier Fields (HFF) lensing maps is required as a starting point.
For multiply-imaged sources, the tool can also fit and apply first (deflection)
second (shear, convergence) and third order (flexion) corrections to the local
gravitational potential to improve the overall reconstruction, depending on the
quality of the data. We illustrate the performance and features of the code
with two examples of multiply-imaged systems taken from the Hubble Frontier
Fields, starting from five different publicly available cluster models. We find
that, after our correction, the relative magnification – and other lensing
properties – between the multiple images become robustly constrained.
Furthermore, we find that scatter between models of the reconstructed source
size and magnitude is reduced. The code and jupyter notebooks are publicly
available.
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