GraL spectroscopic identification of multiply imaged quasars
Abstract
Gravitational lensing is proven to be one of the most efficient tools for studying the Universe. The spectral confirmation of such sources requires extensive calibration. This paper discusses the spectral extraction technique for the case of multiple source spectra being very near each other. Using the masking technique, we first detect high Signal-to-Noise (S/N) peaks in the CCD spectral image corresponding to the location of the source spectra. This technique computes the cumulative signal using a weighted sum, yielding a reliable approximation for the total counts contributed by each source spectrum. We then proceed with the subtraction of the contaminating spectra. Applying this method, we confirm the nature of 11 lensed quasar candidates.
Cite
@article{arxiv.2312.08217,
title = {GraL spectroscopic identification of multiply imaged quasars},
author = {Priyanka Jalan and Vibhore Negi and Jean Surdej and Céline Boehm and Ludovic Delchambre and Jakob Sebastian den Brok and Dougal Dobie and Andrew Drake and Christine Ducourant and S. George Djorgovski and Laurent Galluccio and Matthew J. Graham and Jonas Klüter and Alberto Krone-Martins and Jean-François LeCampion and Ashish A. Mahabal and François Mignard and Tara Murphy and Anna Nierenberg and Sergio Scarano and Joseph Simon and Eric Slezak and Dominique Sluse and Carolina Spíndola-Duarte and Daniel Stern and Ramachrisna Teixera and Joachim Wambsganss},
journal= {arXiv preprint arXiv:2312.08217},
year = {2023}
}
Comments
Accepted for publication in Bulletin de la Soci\'et\'e Royale des Sciences de Li\`ege (BSRSL)