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Margarita Safonova, Igor Igorevich Bulygin, Olga Sergeevna Sazhina, Mikhail Vasil'evich Sazhin, Priya Hasan & Firoza Sutaria

Deep Photometry of Suspected Gravitational Lensing Events: Potential Detection of a Cosmic String

(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

Cosmic strings (CS) are one-dimensional cosmological-size objects predicted in realistic models of the early Universe. Analysis of the cosmic microwave background (CMB) anisotropy data from the Wilkinson Microwave Anisotropy Probe (WMAP) and Planck surveys revealed several CS candidates. One of the candidates, CSc-1, was found to be most reliable because of the statistically significant chains of gravitational lensing (GL) candidates in its field. We observed the brightest of the objects in the CSc-1 field, a galaxy pair SDSSJ110429.61+233150.3. The significant correlation between the spectra of the two components indicates the possible GL nature of the pair. Our simulations of observational data in the CSc-1 field shows that a large number of pairs can be explained by the complex geometry of the CS. Simulations of the SDSSJ110429 galaxy pair has shown that the observed angle between the components of the pair can be explained if the CS is strongly inclined and, possibly, bent in the image plane. In our preliminary data, we also detected the sign of the sharp isophotal edge in one image, which along with CMB and spectral data strongly suggests the possibility of a CS detection.

Keywords : cosmology: observations, gravitational lensing: strong, cosmic string

To cite this article

Margarita Safonova, Igor Igorevich Bulygin, Olga Sergeevna Sazhina, Mikhail Vasil'evich Sazhin, Priya Hasan & Firoza Sutaria, «Deep Photometry of Suspected Gravitational Lensing Events: Potential Detection of a Cosmic String», 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, 790-796 URL : https://popups.uliege.be/0037-9565/index.php?id=11879.

About: Margarita Safonova

Indian Institute of Astrophysics (IIA), Bangalore, India. Corresponding author: margarita.safonova@iiap.res.in

About: Igor Igorevich Bulygin

Sternberg Astronomical Institute (SAI), Moscow, Russia

About: Olga Sergeevna Sazhina

Sternberg Astronomical Institute (SAI), Moscow, Russia

About: Mikhail Vasil'evich Sazhin

Sternberg Astronomical Institute (SAI), Moscow, Russia

About: Priya Hasan

Maulana Azad National Urdu University, Hyderabad, India

About: Firoza Sutaria

Indian Institute of Astrophysics (IIA), Bangalore, India