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- GraL Spectroscopic Identification of Multiply Imaged Quasars
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Priyanka Jalan, Vibhore Negi, Jean Surdej, Céline Boehm, Ludovic Delchambre, Jakob Sebastian den Brok, Dougal Dobie, Andrew Drake, Christine Ducourant, S. George Djorgovski, Laurent Galluccio, Matthew J. Graham, Jonas Klüter, Alberto Krone-Martins, Jean-François LeCampion, Ashish A. Mahabal, François Mignard, Tara Murphy, Anna Nierenberg, Sergio Scarano, Joseph Simon, Eric Slezak, Dominique Sluse, Carolina Spindola-Duarte, Daniel Stern, Ramachrisna Teixera & Joachim Wambsganss 
GraL Spectroscopic Identification of Multiply Imaged Quasars
(Volume 93 - Année 2024 — No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation)
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original pdf fileAbstract
Gravitational lensing is one of the most efficient tools for studying the Universe. However, spectral confirmation of such sources necessitates thorough calibration. This paper discusses the spectral extraction technique for the case where multiple source spectra are close to each other. Using the masking technique, we first identify high signal-to-noise (S/N) peaks in the CCD spectral image corresponding to the location of the source spectra. This technique calculates the cumulative signal via a weighted sum, providing a reliable approximation for the total counts contributed by each source spectrum. Subsequently, we proceed with the removal of the contaminating spectra. Through the application of this method, we confirm the nature of 11 candidate lensed quasars.
Keywords : Quasar, gravitational lensing, spectroscopy, multiply imaged quasars
To cite this article
Priyanka Jalan, Vibhore Negi, Jean Surdej, Céline Boehm, Ludovic Delchambre, Jakob Sebastian den Brok, Dougal Dobie, Andrew Drake, Christine Ducourant, S. George Djorgovski, Laurent Galluccio, Matthew J. Graham, Jonas Klüter, Alberto Krone-Martins, Jean-François LeCampion, Ashish A. Mahabal, François Mignard, Tara Murphy, Anna Nierenberg, Sergio Scarano, Joseph Simon, Eric Slezak, Dominique Sluse, Carolina Spindola-Duarte, Daniel Stern, Ramachrisna Teixera & Joachim Wambsganss, «GraL Spectroscopic Identification of Multiply Imaged Quasars», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 93 - Année 2024, No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation, 752-765 URL : http://popups.ulg.be/0037-9565/index.php?id=11868.
About: Priyanka Jalan
Center for Theoretical Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland. Corresponding author: priyajalan14@gmail.com
About: Vibhore Negi
Aryabhatta Research Institute of Observational Sciences, Nainital, Uttarakhand, India
About: Jean Surdej
Institut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 19c, B-4000 Liège, Belgium
About: Céline Boehm
School of Physics, The University of Sydney, NSW 2006, Australia
About: Ludovic Delchambre
Institut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 19c, B-4000 Liège, Belgium
About: Jakob Sebastian den Brok
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
About: Dougal Dobie
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
About: Andrew Drake
Cahill Center for Astronomy and Astrophysics, California Institute of Technology, 1216 E. California Blvd., Pasadena, CA 91125, US
About: Christine Ducourant
Laboratoire d’Astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, allée Geoffroy Saint-Hilaire, 33615 Pessac, France
About: S. George Djorgovski
Cahill Center for Astronomy and Astrophysics, California Institute of Technology, 1216 E. California Blvd., Pasadena, CA 91125, US
About: Laurent Galluccio
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, Boulevard de l’Observatoire, CS 34229, 06304 Nice, France
About: Matthew J. Graham
Cahill Center for Astronomy and Astrophysics, California Institute of Technology, 1216 E. California Blvd., Pasadena, CA 91125, US
About: Jonas Klüter
Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut, Mönchhofstr. 12-14, 69120 Heidelberg, Germany and Department of Physics & Astronomy, Louisiana State University, 261 Nicholson Hall, Tower Dr., Baton Rouge, LA 70803-4001, US
About: Alberto Krone-Martins
Donald Bren School of Information and Computer Sciences, University of California, Irvine, Irvine CA 92697, US and CENTRA, Faculdade de Cincias, Universidade de Lisboa, 1749-016, Lisbon, Portugal
About: Jean-François LeCampion
Laboratoire d’Astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, allée Geoffroy Saint-Hilaire, 33615 Pessac, France
About: Ashish A. Mahabal
Cahill Center for Astronomy and Astrophysics, California Institute of Technology, 1216 E. California Blvd., Pasadena, CA 91125, US
About: François Mignard
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, Boulevard de l’Observatoire, CS 34229, 06304 Nice, France
About: Tara Murphy
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
About: Anna Nierenberg
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Mail Stop 264-789, Pasadena, CA 91109, USA
About: Sergio Scarano
Departamento de Física - CCET, Universidade Federal de Sergipe, Rod. Marechal Rondon s/n, 49.100-000, Jardim Rosa Elze, São Cristóvão, SE, Brazil
About: Joseph Simon
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Mail Stop 264-789, Pasadena, CA 91109, USA
About: Eric Slezak
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, Boulevard de l’Observatoire, CS 34229, 06304 Nice, France
About: Dominique Sluse
Institut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 19c, B-4000 Liège, Belgium
About: Carolina Spindola-Duarte
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226, Cidade Universitária, 05508-900 São Paulo, SP, Brazil
About: Daniel Stern
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Mail Stop 264-789, Pasadena, CA 91109, USA
About: Ramachrisna Teixera
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226, Cidade Universitária, 05508-900 São Paulo, SP, Brazil
About: Joachim Wambsganss
Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut, Mönchhofstr. 12-14, 69120 Heidelberg, Germany and International Space Science Institute (ISSI), Hallerstraße 6, 3012 Bern, Switzerland