Gravitational Lensing

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 6928

Special Issue Editor


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Guest Editor
Istituto Nazionale Astrofisica - Italy
Interests: cosmology; galaxy clusters; gravitational lensing

Special Issue Information

Dear Colleagues,

Gravitational lensing is currently a prime tool to investigate a number of astrophysical problems: From understanding the structure of our own galaxy, to searching for extrasolar planets, from studying the distribution of matter in galaxies and galaxy clusters, to understanding the nature of the main constituents of our universe, dark matter, and dark energy. A century passed since Albert Einstein published his theory of general relativity and since then, the accomplishments of gravitational lensing have been huge. This Special Issue wants to focus on the most recent developments in this field of astronomy and discuss what are the open questions that lensing can help to answer in the near future. Not only will the next years see the launch of missions like Euclid and WFIRST, but a new generation of instruments and telescopes, both on the ground and in space, will be available to the lensing community. The number of gravitational lenses discovered will increase by orders of magnitude and it will be possible to study a large number of them with unprecedented levels of details at different wavelengths.

Prof. Dr. Massimo Meneghetti
Guest Editor

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Keywords

  • Microlensing
  • Weak and strong lensing by galaxies and galaxy clusters
  • Cosmological weak lensing and CMB lensing

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Published Papers (2 papers)

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Research

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12 pages, 902 KiB  
Article
Strongly Lensed Supernovae in Well-Studied Galaxy Clusters with the Vera C. Rubin Observatory
by Tanja Petrushevska
Symmetry 2020, 12(12), 1966; https://doi.org/10.3390/sym12121966 - 27 Nov 2020
Cited by 4 | Viewed by 1763
Abstract
Strong lensing by galaxy clusters can be used to significantly expand the survey reach, thus allowing observation of magnified high-redshift supernovae that otherwise would remain undetected. Strong lensing can also provide multiple images of the galaxies that lie behind the clusters. Detection of [...] Read more.
Strong lensing by galaxy clusters can be used to significantly expand the survey reach, thus allowing observation of magnified high-redshift supernovae that otherwise would remain undetected. Strong lensing can also provide multiple images of the galaxies that lie behind the clusters. Detection of strongly lensed Type Ia supernovae (SNe Ia) is especially useful because of their standardizable brightness, as they can be used to improve either cluster lensing models or independent measurements of cosmological parameters. The cosmological parameter, the Hubble constant, is of particular interest given the discrepancy regarding its value from measurements with different approaches. Here, we explore the feasibility of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) of detecting strongly lensed SNe in the field of five galaxy clusters (Abell 1689 and Hubble Frontier Fields clusters) that have well-studied lensing models. Considering the 88 systems composed of 268 individual multiple images in the five cluster fields, we find that the LSST will be sensitive to SNe Ia (SNe IIP) exploding in 41 (23) galaxy images. The range of redshift of these galaxies is between 1.01<z<3.05. During its 10 years of operation, LSST is expected to detect 0.2±0.1 SN Ia and 0.9±0.3 core collapse SNe. However, as LSST will observe many more massive galaxy clusters, it is likely that the expectations are higher. We stress the importance of having an additional observing program for photometric and spectroscopic follow-up of the strongly lensed SNe detected by LSST. Full article
(This article belongs to the Special Issue Gravitational Lensing)
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Review

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19 pages, 6893 KiB  
Review
Image Simulations for Strong and Weak Gravitational Lensing
by Andrés A. Plazas
Symmetry 2020, 12(4), 494; https://doi.org/10.3390/sym12040494 - 26 Mar 2020
Cited by 9 | Viewed by 4719
Abstract
Gravitational lensing has been identified as a powerful tool to address fundamental problems in astrophysics at different scales, ranging from exoplanet identification to dark energy and dark matter characterization in cosmology. Image simulations have played a fundamental role in the realization of the [...] Read more.
Gravitational lensing has been identified as a powerful tool to address fundamental problems in astrophysics at different scales, ranging from exoplanet identification to dark energy and dark matter characterization in cosmology. Image simulations have played a fundamental role in the realization of the full potential of gravitational lensing by providing a means to address needs such as systematic error characterization, pipeline testing, calibration analyses, code validation, and model development. We present a general overview of the generation and applications of image simulations in strong and weak gravitational lensing. Full article
(This article belongs to the Special Issue Gravitational Lensing)
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