SED-dependent Galactic Extinction Prescription for Euclid and Future Cosmological Surveys
Audrey Galametz, Roberto Saglia, Stephane Paltani, Nikolaos, Apostolakos, Pierre Dubath

TL;DR
This paper introduces a new SED-dependent Galactic extinction correction method to improve photometric redshift accuracy in cosmological surveys like Euclid, addressing biases caused by traditional SED-agnostic approaches.
Contribution
It develops a novel prescription for Galactic extinction correction that accounts for SED dependence, enhancing the accuracy of photometric redshifts in large surveys.
Findings
Band-pass corrections vary by up to 20% for different SEDs.
Extinction correction inaccuracies can cause >0.2% bias in photometric redshifts.
The new prescription reduces extinction-related biases in cosmological measurements.
Abstract
The outcome of upcoming cosmological surveys will depend on the accurate estimates of photometric redshifts. In the framework of the implementation of the photo-z algorithm for Euclid, we are exploring new avenues to improve template-fitting methods. The paper focusses on the prescription of the extinction of source light by dust in the Milky Way. Since Galactic extinction strongly correlates with wavelength and photometry is commonly obtained in broad-band filters, the amount of absorption depends on the source SED, a point often neglected as the SED is not known a-priori. A consequence of this is that the observed E(B-V) (=A_B-A_V) will be different from the E(B-V) used to normalise the absorption law k_lambda (=A_lambda/E(B-V)). Band-pass corrections are required to renormalise the law for a given SED. We assess the band-pass corrections of a range of SEDs and find they vary by up to…
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