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Black Hole

Lensing of space time around a black hole. At Oxford we study black holes observationally and theoretically on all size and time scales - it is some of our core work.

Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES.

Dr Aprajita Verma

Senior Research Fellow

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Zooniverse
  • Astronomical instrumentation
  • Galaxy formation and evolution
  • Rubin-LSST
  • Extremely Large Telescope
aprajita.verma@physics.ox.ac.uk
Telephone: 01865 (2)73374
Denys Wilkinson Building, room 760
  • About
  • Outreach
  • Teaching
  • Publications

Strong gravitational lenses from the Vera C. Rubin Observatory

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences The Royal Society 383:2295 (2025) 20240117

Authors:

Anowar J Shajib, Graham P Smith, Simon Birrer, Aprajita Verma, Nikki Arendse, Thomas Collett, Tansu Daylan, Stephen Serjeant

Abstract:

Like many areas of astrophysics and cosmology, the Vera C. Rubin Observatory will be transformational for almost all the applications of strong lensing, thanks to the dramatic increase in the number of known strong lenses by two orders of magnitude or more and the readily available time-domain data for the lenses with transient sources. In this article, we provide an overview of the forecasted number of discovered lenses of different types and describe the primary science cases these large lens samples will enable. We provide an updated forecast on the joint constraint for the dark energy equation-of-state parameters, w0 and wa, from combining all strong-lensing probes of dark energy. We update the previous forecast from the Rubin Observatory Dark Energy Science Collaboration’s Science Review Document by adding two new crucial strong-lensing samples: lensed type Ia supernovae and single-deflector lenses with measured stellar kinematics. Finally, we describe the current and near-future activities and collaborative efforts within the strong-lensing community in preparation for the arrival of the first real dataset from Rubin in 2026. This article is part of the Theo Murphy meeting issue ‘Multi-messenger gravitational lensing (Part 2)’.
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Euclid: The Early Release Observations Lens Search Experiment

Astronomy & Astrophysics EDP Sciences 697 (2025) a14

Authors:

JA Acevedo Barroso, CM O’Riordan, B Clément, C Tortora, TE Collett, F Courbin, R Gavazzi, RB Metcalf, V Busillo, IT Andika, R Cabanac, HM Courtois, J Crook-Mansour, L Delchambre, G Despali, LR Ecker, A Franco, P Holloway, N Jackson, K Jahnke, G Mahler, L Marchetti, P Matavulj, A Melo, M Meneghetti, LA Moustakas, O Müller, AA Nucita, A Paulino-Afonso, J Pearson, K Rojas, C Scarlata, S Schuldt, S Serjeant, D Sluse, SH Suyu, M Vaccari, A Verma, G Vernardos, M Walmsley, H Bouy, GL Walth, DM Powell, M Bolzonella, J-C Cuillandre, M Kluge, T Saifollahi, M Schirmer, C Stone, A Acebron, L Bazzanini, A Díaz-Sánchez, NB Hogg, LVE Koopmans, S Kruk, L Leuzzi, A Manjón-García, F Mannucci, BC Nagam, R Pearce-Casey, L Scharré, J Wilde, B Altieri, A Amara, S Andreon, N Auricchio, C Baccigalupi, M Baldi, A Balestra, S Bardelli, A Basset, P Battaglia, R Bender, D Bonino, E Branchini, M Brescia, J Brinchmann, A Caillat, S Camera, GP Candini, V Capobianco, C Carbone, J Carretero, S Casas, M Castellano, G Castignani, S Cavuoti, A Cimatti, C Colodro-Conde, G Congedo, CJ Conselice, L Conversi, Y Copin, L Corcione, M Cropper, A Da Silva, H Degaudenzi, G De Lucia, J Dinis, F Dubath, X Dupac, S Dusini, M Farina, S Farrens, S Ferriol, M Frailis, E Franceschi, S Galeotta, B Garilli, K George, W Gillard, B Gillis, C Giocoli, P Gómez-Alvarez, A Grazian, F Grupp, L Guzzo, SVH Haugan, H Hoekstra, W Holmes, I Hook, F Hormuth, A Hornstrup, M Jhabvala, B Joachimi, E Keihänen, S Kermiche, A Kiessling, B Kubik, M Kunz, H Kurki-Suonio, D Le Mignant, S Ligori, PB Lilje, V Lindholm, I Lloro, G Mainetti, E Maiorano, O Mansutti, S Marcin, O Marggraf, M Martinelli, N Martinet, F Marulli, R Massey, E Medinaceli, M Melchior, Y Mellier, E Merlin, G Meylan, M Moresco, L Moscardini, E Munari, R Nakajima, C Neissner, RC Nichol, S-M Niemi, JW Nightingale, C Padilla, S Paltani, F Pasian, K Pedersen, WJ Percival, V Pettorino, S Pires, G Polenta, M Poncet, LA Popa, L Pozzetti, F Raison, R Rebolo, A Renzi, J Rhodes, G Riccio, E Romelli, M Roncarelli, E Rossetti, R Saglia, Z Sakr, AG Sánchez, D Sapone, P Schneider, T Schrabback, A Secroun, G Seidel, S Serrano, C Sirignano, G Sirri, J Skottfelt, L Stanco, J Steinwagner, P Tallada-Crespí, D Tavagnacco, AN Taylor, I Tereno, R Toledo-Moreo, F Torradeflot, I Tutusaus, EA Valentijn, L Valenziano, T Vassallo, Y Wang, J Weller, E Zucca, C Burigana, V Scottez, M Viel, D Scott, S Vegetti
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Euclid: Searches for strong gravitational lenses using convolutional neural nets in Early Release Observations of the Perseus field

Astronomy & Astrophysics EDP Sciences 696 (2025) a214

Authors:

R Pearce-Casey, BC Nagam, J Wilde, V Busillo, L Ulivi, IT Andika, A Manjón-García, L Leuzzi, P Matavulj, S Serjeant, M Walmsley, JA Acevedo Barroso, CM O’Riordan, B Clément, C Tortora, TE Collett, F Courbin, R Gavazzi, RB Metcalf, R Cabanac, HM Courtois, J Crook-Mansour, L Delchambre, G Despali, LR Ecker, A Franco, P Holloway, K Jahnke, G Mahler, L Marchetti, A Melo, M Meneghetti, O Müller, AA Nucita, J Pearson, K Rojas, C Scarlata, S Schuldt, D Sluse, SH Suyu, M Vaccari, S Vegetti, A Verma, G Vernardos, M Bolzonella, M Kluge, T Saifollahi, M Schirmer, C Stone, A Paulino-Afonso, L Bazzanini, NB Hogg, LVE Koopmans, S Kruk, F Mannucci, JM Bromley, A Díaz-Sánchez, HJ Dickinson, DM Powell, H Bouy, R Laureijs, B Altieri, A Amara, S Andreon, C Baccigalupi, M Baldi, A Balestra, S Bardelli, P Battaglia, D Bonino, E Branchini, M Brescia, J Brinchmann, A Caillat, S Camera, V Capobianco, C Carbone, J Carretero, S Casas, M Castellano, G Castignani, S Cavuoti, A Cimatti, C Colodro-Conde, G Congedo, CJ Conselice, L Conversi, Y Copin, M Cropper, A Da Silva, H Degaudenzi, G De Lucia, AM Di Giorgio, J Dinis, F Dubath, X Dupac, S Dusini, M Farina, S Farrens, F Faustini, S Ferriol, M Frailis, E Franceschi, S Galeotta, K George, W Gillard, B Gillis, C Giocoli, P Gómez-Alvarez, A Grazian, F Grupp, SVH Haugan, W Holmes, I Hook, F Hormuth, A Hornstrup, P Hudelot, M Jhabvala, B Joachimi, E Keihänen, S Kermiche, A Kiessling, M Kilbinger, B Kubik, M Kümmel, M Kunz, H Kurki-Suonio, D Le Mignant, S Ligori, PB Lilje, V Lindholm, I Lloro, E Maiorano, O Mansutti, O Marggraf, K Markovic, M Martinelli, N Martinet, F Marulli, R Massey, E Medinaceli, S Mei, M Melchior, Y Mellier, E Merlin, G Meylan, M Moresco, L Moscardini, R Nakajima, C Neissner, RC Nichol, S-M Niemi, JW Nightingale, C Padilla, S Paltani, F Pasian, K Pedersen, WJ Percival, V Pettorino, S Pires, G Polenta, M Poncet, LA Popa, L Pozzetti, F Raison, A Renzi, J Rhodes, G Riccio, E Romelli, M Roncarelli, E Rossetti, R Saglia, Z Sakr, AG Sánchez, D Sapone, B Sartoris, P Schneider, T Schrabback, A Secroun, G Seidel, S Serrano, C Sirignano, G Sirri, J Skottfelt, L Stanco, J Steinwagner, P Tallada-Crespí, I Tereno, R Toledo-Moreo, F Torradeflot, I Tutusaus, EA Valentijn, L Valenziano, T Vassallo, G Verdoes Kleijn, A Veropalumbo, Y Wang, J Weller, G Zamorani, E Zucca, C Burigana, M Calabrese, A Mora, M Pöntinen, V Scottez, M Viel, B Margalef-Bentabol
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Molecular Gas Heating, Star Formation Rate Relations, and AGN Feedback in Infrared-luminous Galaxy Mergers

(2025)

Authors:

Duncan Farrah, Andreas Efstathiou, Jose Afonso, David L Clements, Kevin Croker, Evanthia Hatziminaoglou, Maya Joyce, Vianney Lebouteiller, Alaine Lee, Carol Lonsdale, Chris Pearson, Sara Petty, Lura K Pitchford, Dimitra Rigopoulou, Aprajita Verma, Lingyu Wang
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Galaxy formation and symbiotic evolution with the inter-galactic medium in the age of ELT-ANDES

Experimental Astronomy Springer Nature 58:3 (2024) 21

Authors:

Valentina D’Odorico, James S Bolton, Lise Christensen, Annalisa De Cia, Erik Zackrisson, Aron Kordt, Luca Izzo, Jiangtao Li, Roberto Maiolino, Alessandro Marconi, Philipp Richter, Andrea Saccardi, Stefania Salvadori, Irene Vanni, Chiara Feruglio, Michele Fumagalli, Johan PU Fynbo, Pasquier Noterdaeme, Polychronis Papaderos, Céline Péroux, Aprajita Verma, Paolo Di Marcantonio, Livia Origlia, Alessio Zanutta

Abstract:

High-resolution absorption spectroscopy toward bright background sources has had a paramount role in understanding early galaxy formation, the evolution of the intergalactic medium and the reionisation of the Universe. However, these studies are now approaching the boundaries of what can be achieved at ground-based 8-10m class telescopes. The identification of primeval systems at the highest redshifts, within the reionisation epoch and even into the dark ages, and of the products of the first generation of stars and the chemical enrichment of the early Universe, requires observing very faint targets with a signal-to-noise ratio high enough to detect very weak spectral signatures. In this paper, we describe the giant leap forward that will be enabled by ANDES, the high-resolution spectrograph for the ELT, in these key science fields, together with a brief, non-exhaustive overview of other extragalactic research topics that will be pursued by this instrument, and its synergistic use with other facilities that will become available in the early 2030s.
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