GraL spectroscopic identification of multiply imaged quasars
- Creators
- Jalan, Priyanka
- Negi, Vibhore
- Surdej, Jean
- Boehm, Céline
- Delchambre, Ludovic
- Brok, Jakob Sebastian Den
- Dobie, Dougal
- Drake, Andrew
- Ducourant, Christine
- Djorgovski, S. George
- Galluccio, Laurent
- Graham, Matthew J
- Klüter, Jonas
- Krone-Martins, Alberto
- Lecampion, Jean-François
- 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
- Others:
- Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB) ; Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Joseph Louis LAGRANGE (LAGRANGE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
Citation
Description
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.
Abstract
International audience
Additional details
- URL
- https://hal.science/hal-04372627
- URN
- urn:oai:HAL:hal-04372627v1
- Origin repository
- UNICA