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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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Abstract

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 : https://popups.uliege.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