Essentials of Strong Gravitational Lensing

Saha, Prasenjit; Sluse, Dominique; Wagner, Jenny; Williams, Liliya L. R.

doi:10.1007/s11214-024-01041-w

Cited by 8 publications

(1 citation statement)

References 97 publications

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“…Hence, the effect of lensing should also enhance the observed TDE fluxes, which will bring more highz (Pop III) TDEs into view. While it has been shown that the chance of having a high-z galaxy lensed is roughly ∼10 −3 (Saha et al 2024), the probability of having lensed transients is yet to be studied in detail.…”

Section: Summary and Discussionmentioning

confidence: 99%

Detecting Population III Stars through Tidal Disruption Events in the Era of JWST and Roman

Kar Chowdhury,

Chang,

Dai

et al. 2024

ApJL

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The first-generation metal-free stars, referred to as Population III (Pop III) stars, are believed to be the first objects to form out of the pristine gas in the very early Universe. Pop III stars have different structures from the current generation of stars and are important for generating heavy elements and shaping subsequent star formation. However, it is very challenging to directly detect Pop III stars given their high redshifts and short lifetimes. In this Letter, we propose a novel method for detecting Pop III stars through their tidal disruption events (TDEs) by massive black holes. We model the emission properties and calculate the expected rates for these unique TDEs in the early Universe at z ∼ 10. We find that Pop III star TDEs have much higher mass fallback rates and longer evolution timescales compared to solar-type star TDEs in the local Universe, which enhances the feasibility of their detection, although a good survey strategy will be needed for categorizing these sources as transients. We further demonstrate that a large fraction of the flare emissions are redshifted to infrared wavelengths, which can be detected by the JWST and the Nancy Grace Roman Space Telescope (Roman). Last but not least, we find a promising Pop III star TDE detection rate of up to a few tens per year using Roman, based on our current understanding of the black hole mass function in the early Universe.

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Section: Summary and Discussionmentioning

confidence: 99%

Detecting Population III Stars through Tidal Disruption Events in the Era of JWST and Roman

Kar Chowdhury,

Chang,

Dai

et al. 2024

ApJL

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Approximating photon trajectories in spherically symmetric spacetimes

Sultana

2024

Gen Relativ Gravit

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In this paper we use the Homotopy analysis method to obtain an analytic approximation for the entire photon trajectory in the Schwarzschild spacetime. This is usually expressed exactly in terms of an elliptic integral. We compare our approximation with other formulae found in the literature, which were specifically obtained for the Schwarzschild solution. Unlike some of these formulae, our approximation can be applied and maintains a good accuracy for emission point close to the event horizon and also for emission angles close to and greater than $$\pi /2$$ π / 2 . We show that our method can easily be applied to other spherically symmetric solutions such as the Reissner-Nordström solution. Such an approximation would be useful when accurate determination of the light trajectories around compact objects is required without the need to revert to time consuming numerical integration of elliptic integrals.

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Microlensing of Strongly Lensed Quasars

Vernardos,

Sluse,

Pooley

et al. 2024

Space Sci Rev

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Strong gravitational lensing of quasars has the potential to unlock the poorly understood physics of these fascinating objects, as well as serve as a probe of the lensing mass distribution and of cosmological parameters. In particular, gravitational microlensing by compact bodies in the lensing galaxy can enable mapping of quasar structure to $<10^{-6}$ < 10 − 6 arcsec scales. Some of this potential has been realized over the past few decades, however the upcoming era of large sky surveys promises to bring this promise to full fruition. In this article, we review the theoretical framework of this field, describe the prominent current methods for parameter inference from quasar microlensing data across different observing modalities, and discuss the constraints so far derived on the geometry and physics of quasar inner structure. We also review the application of strong lensing and microlensing to constraining the granularity of the lens potential, i.e. the contribution of the baryonic and dark matter components, and the local mass distribution in the lens, i.e. the stellar mass function. Finally, we discuss the future of the field, including the new possibilities that will be opened by the next generation of large surveys and by new analysis methods now being developed.

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Essentials of Strong Gravitational Lensing

Cited by 8 publications

References 97 publications

Detecting Population III Stars through Tidal Disruption Events in the Era of JWST and Roman

Detecting Population III Stars through Tidal Disruption Events in the Era of JWST and Roman

Approximating photon trajectories in spherically symmetric spacetimes

Microlensing of Strongly Lensed Quasars

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