Research

In this project, we study the higher-order singularities (or catastrophes) in strong gravitational lensing. We developed an algorithm that locates all the possible singularities for a given lens mass model.

• Meena, A. K., Bagla, J. S., "Image formation near hyperbolic umbilic in strong gravitational lensing", arXiv:2405.16826.

• Meena, A. K., Bagla, J. S., "Exotic image formation in strong gravitational lensing by clusters of galaxies -- IV. Elliptical NFW Lenses and Hyperbolic Umbilics", MNRAS, 526, 3902 (2023).

• Meena, A. K., Bagla, J. S., "Exotic image formation in strong gravitational lensing by clusters of galaxies -- III: Statistics with HUDF", MNRAS, 515, 4151 (2022).

• Meena, A. K., Ghosh, A., Bagla, J. S., Williams, L. L. R., "Exotic image formation in strong gravitational lensing by clusters of galaxies -- II: Uncertainties", MNRAS, 506, 1526 (2021).

• Meena, A. K., Bagla, J. S., "Exotic image formation in strong gravitational lensing by clusters of galaxies -- I: Cross-section", MNRAS, 503, 2097 (2021).

• Meena, A. K., Bagla, J. S., "Finding singularities in gravitational lensing", MNRAS, 492, 3294 (2020).

In this project, we study the effect of strong lensing and microlensing on gravitational wave signals.

• Mishra, A., Meena, A. K., More, A., Bose, S., "Exploring the Impact of Microlensing on Gravitational Wave Signals: Biases, Population Characteristics, and Prospects for Detection", MNRAS, 531, 764 (2024).

• Meena, A. K., "Gravitational Lensing of Gravitational Waves: Probing Intermediate Mass Black Holes in Galaxy Lenses with Global Minima", arXiv:2305.02880.

• Meena, A. K., Mishra, A., More, A., Bose, S., Bagla, J. S., "Gravitational Lensing of Gravitational Waves: Probability of Microlensing in Galaxy-Scale Lens Population", MNRAS, 517, 872 (2022).

• Ramesh, R., Meena, A. K., Bagla, J. S., "Wave Effects in Double-Plane Lensing", JoAA, 43, 38 (2022).

• Ramesh, R., Meena, A. K., Bagla, J. S., "Gravitational Lensing of Core Collapse Supernova Gravitational Wave Signals", JoAA, 43, 1 (2022).

• Mishra, A., Meena, A. K., More, A., Bose, S., Bagla, J. S., "Gravitational Lensing of Gravitational Waves: Effect of Microlens Population in Lensing Galaxies", MNRAS, 508, 4869 (2021).

• Meena, A. K., Bagla, J. S., "Gravitational lensing of gravitational waves: wave nature and prospects for detection", MNRAS, 492, 1127 (2020).

• Jahanvi, Meena, A. K., Bagla, J. S., "Gravitational Waves from Merging Binaries", arXiv:1912.09247.

In this project, we study cosmological microlensing events in galaxy clusters.

• Furtak, L. J., Meena, A. K., et al., "Reaching for the stars -- JWST/NIRSpec spectroscopy of a lensed star candidate at z=4.76", MNRAS Letters, 527, L7 (2024).

• Meena, A. K., et al., "Two lensed star candidates at z≃4.8 behind the galaxy cluster MACS J0647.7+7015", ApJL, 944, L6 (2023).

• Meena, A. K., et al., "Flashlights: An Off-Caustic Lensed Star at Redshift z=1.26 in Abell 370", MNRAS, 521, 5224 (2023).

• Diego, J. M., Meena, A. K., et al., "JWST's PEARLS: a new lens model for ACT-CL J0102-4915, "EL Gordo'', and the first red supergiant star at cosmological distances discovered by JWST", A&A, 672, A3 (2023).

• Meena, A. K., Arad, O., Zitrin, A., "An Efficient Method for Simulating Light Curves of Cosmological Microlensing and Caustic Crossing Events", MNRAS, 514, 2545 (2022).

These projects do not fit any of the above categories but are equally interesting!

• Meena, A. K., Saha, P., "What are the parities of photon-ring images near a black hole?", OJAp, Volume 6 (2023). 

In these works, my contribution is not significant.

• Diego, J. M., “A high-resolution view of the source-plane magnification near cluster caustics in wave dark matter models”, arXiv:2406.08537.

• Broadhurst, T., “Dark Matter distinguished by skewed microlensing in the “Dragon Arc””, arXiv:2405.19422.

• Fudamoto, Y., et al., “JWST Discovery of 40+ Microlensed Stars in a Magnified Galaxy, the "Dragon" behind Abell 370”, arXiv:2404.08045.

• Li, S. K., et al., “Flashlights: Microlensing vs Stellar Variability of Transients in the Star Clusters of the Dragon Arc”, arXiv:2404.08571.

• Diego, J. M., et al., “Imaging dark matter at the smallest scales with lensed stars”, arXiv:2404.08033.

• Furtak, L. J., et al., “A complex node of the cosmic web associated with the massive galaxy cluster MACS J0600.1-2008”, arXiv:2404.03286.

• Pascale, M., et al., “SN H0pe: The First Measurement of H0 from a Multiply-Imaged Type Ia Supernova, Discovered by JWST”, arXiv:2403.18902.

• Chen, W., et al., “JWST Spectroscopy of SN H0pe: Classification and Time Delays of a Triply-imaged Type Ia Supernova at z=1.78”, arXiv:2403.19029.

• Pierel, J. D. R., “JWST Photometric Time-Delay and Magnification Measurements for the Triply-Imaged Type Ia "Supernova H0pe" at z=1.78”, APJ, 967, 50 (2024).

• Williams, L. L. R., et al., “Flashlights: Properties of Highly Magnified Images Near Cluster Critical Curves in the Presence of Dark Matter Subhalos”, ApJ, 961, 200 (2024).

• Diego, J. M., et al., “BUFFALO/Flashlights: Constraints on the abundance of lensed supergiant stars in the Spock galaxy at redshift 1” A&A, 681, A124 (2024).

• Frye, B. L., et al., “The JWST Discovery of the Triply-imaged Type Ia "Supernova H0pe'' and Observations of the Galaxy Cluster PLCK G165.7+67.0”, ApJ, 961, 171 (2024).

• Zackrisson, E., et al., “The detection and characterization of highly magnified stars with JWST: Prospects of finding Population III”, arXiv:2312.09289.

• Diego, J. M., et al., “JWST's PEARLS: Mothra, a new kaiju star at z=2.091 extremely magnified by MACS0416, and implications for dark matter models” A&A, 679, A31 (2023).

• Smail, I., et al., “Hidden giants in JWST's PEARLS: an ultra-massive z=4.26 sub-millimeter galaxy that is invisible to HST”, ApJ, 958, 36 (2023).

• Frye, B., et al., “SN H0pe: three images of a SN detected near the central region of the galaxy cluster field PLCK G165.7+67.0”, TNS AstroNote, 96, 1 (2023).

• Golubchik, M., et al., “A search for transients in the Reionization Lensing Cluster Survey (RELICS): Three new supernovae”, MNRAS, 522, 4718 (2023).

• Kelly, P. L., et al., “Flashlights: More than A Dozen High-Significance Microlensing Events of Extremely Magnified Stars in Galaxies at Redshifts z=0.7-1.5”, arXiv:2211:02670

• Hsiao,  T. Y. Y., et al., “JWST reveals a possible z~11 galaxy merger in triply-lensed MACS0647-JD”, ApJL, 949, L34 (2023).

• Abdurro'uf, et al., “Spatially Resolved Stellar Populations of 0.3<z<6.0 Galaxies in WHL0137-08 and MACS0647+70 Clusters as Revealed by JWST: How do Galaxies Grow and Quench Over Cosmic Time?”, APJ, 945, 117 (2023).

• Windhorst, R. A., et al., “JWST PEARLS: Prime Extragalactic Areas for Reionization and Lensing Science: Project Overview and First Results”, AJ, 165, 13 (2022).

• Chen, W., et al., “Early results from GLASS-JWST VIII: An Extremely Magnified Blue Supergiant Star at Redshift 2.65 in the Abell 2744 Cluster Field”, ApJL, 940, L54 (2022).

• Pascale, M., et al., “Unscrambling the lensed galaxies in JWST images behind SMACS0723”, ApJL, 938, L6 (2022).

• Gulobchik, M., et al., “HST strong-lensing model for the first JWST galaxy cluster SMACS J0723.3-7327”, ApJ, 938, 14 (2022).