| Name: | Margarita Safonova |
| Affiliation: | Indian Institute of Astrophysics |
| Conference ID : | ASI2023_184 |
| Title : | Potential gravitational lensing on a cosmic string candidate: observations and modelling |
| Authors : | Margarita Safonova (Indian Institute of Astrophysics (IIA), Bangalore, India)
I. I. Bulygin, O. S. Sazhina, M. V. Sazhin (Sternberg Astronomical Institute (SAI), Moscow, Russia)
Priya Hasan (Maulana Azad National Urdu University (MANUU), Hyderabad, India)
Firoza Sutaria, Pramod Kumar S. (Indian Institute of Astrophysics (IIA), Bangalore, India)
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| Mode of Presentation: | Poster |
| Abstract Category : | General Relativity and Cosmology |
| Abstract : | Cosmic strings (CS) are one-dimensional extended objects predicted by modern cosmology, which, however, have not yet been detected with a high degree of confidence. The presence of cosmic strings changes the global geometry of the Universe and could serve as a unique proof of higher-dimensional theories. Two main methods of observational search for CS are: CMB anisotropy induced by a fast-moving cosmic string, and gravitational lensing (GL) which arises when a CS is located between the observer and the background object(s). Unlike conventional GL, the resulting images are undistorted, but may have sharp edges of isophotes depending on the distance between the string and the source. In addition, conventional gravitational lenses tend to produce an odd number of images, while CS forms only two. We discuss here the results obtained from observations of a galaxy pair SDSSJ110429 – the brightest in the statistically significant chain of possible GL images situated along the expected location of the CSc-1 – the CMB CS candidate. We have obtained images and high-quality spectra of each component of a pair. We have found the significant correlation between the spectra of the two components, indicating the possible GL nature of the pair. The results of the simulations have shown that the observed angle between the components of the pair can be explained if the string is strongly inclined to the line of sight. The possible identity of the spectra of components of this source, together with the previously obtained indications for the presence of CS in this field, may serve as an unambiguous proof of the detection of CS. |
