GraL spectroscopic identification of multiply imaged quasars

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...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2023-12
Main Authors: Jalan, Priyanka, Negi, Vibhore, Surdej, Jean, Boehm, Céline, Delchambre, Ludovic, Jakob Sebastian den Brok, Dobie, Dougal, Drake, Andrew, Ducourant, Christine, Djorgovski, S George, Galluccio, Laurent, Graham, Matthew J, Klüter, Jonas, Krone-Martins, Alberto, Jean-François LeCampion, Mahabal, Ashish A, Mignard, François, Murphy, Tara, Nierenberg, Anna, Scarano, Sergio, Simon, Joseph, Slezak, Eric, Sluse, Dominique, Spíndola-Duarte, Carolina, Stern, Daniel, Teixera, Ramachrisna, Wambsganss, Joachim
Format: Article
Language:English
Subjects:
Gravitational lenses
Quasars
Spectra
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2331-8422