Christopher Duncan: Publications

On cosmological bias due to the magnification of shear and position samples in modern weak lensing analyses

Monthly Notices of the Royal Astronomical Society 91̽�� University Press 515:1 (2022) 1130-1145

Abstract:

The magnification of galaxies in modern galaxy surveys induces additional correlations in the cosmic shear, galaxy-galaxy lensing and clustering observables used in modern lensing “3x2pt” analyses, due to sample selection. In this paper, we emulate the magnification contribution to all three observables utilising the SLICS simulations suite, and test the sensitivity of the cosmological model, galaxy bias and redshift distribution calibration to un-modelled magnification in a Stage-IV-like survey using Monte-Carlo sampling. We find that magnification cannot be ignored in any single or combined observable, with magnification inducing > 1σ biases in the w0 − σ8 plane, including for cosmic shear and 3x2pt analyses. Significant cosmological biases exist in the 3x2pt and cosmic shear from magnification of the shear sample alone. We show that magnification induces significant biases in the mean of the redshift distribution where a position sample is analysed, which may potentially be used to identify contamination by magnification.

Euclid preparation

Astronomy & Astrophysics EDP Sciences 662 (2022) a112

Authors:

R Scaramella, J Amiaux, Y Mellier, C Burigana, CS Carvalho, J-C Cuillandre, A Da Silva, A Derosa, J Dinis, E Maiorano, M Maris, I Tereno, R Laureijs, T Boenke, G Buenadicha, X Dupac, LM Gaspar Venancio, P Gómez-Álvarez, J Hoar, J Lorenzo Alvarez, GD Racca, G Saavedra-Criado, J Schwartz, R Vavrek, M Schirmer, H Aussel, R Azzollini, VF Cardone, M Cropper, A Ealet, B Garilli, W Gillard, BR Granett, L Guzzo, H Hoekstra, K Jahnke, T Kitching, T Maciaszek, M Meneghetti, L Miller, R Nakajima, SM Niemi, F Pasian, WJ Percival, S Pottinger, M Sauvage, M Scodeggio, S Wachter, A Zacchei, N Aghanim, A Amara, T Auphan, N Auricchio, S Awan, A Balestra, R Bender, C Bodendorf, D Bonino, E Branchini, S Brau-Nogue, M Brescia, GP Candini, V Capobianco, C Carbone, RG Carlberg, J Carretero, R Casas, FJ Castander, M Castellano, S Cavuoti, A Cimatti, R Cledassou, G Congedo, CJ Conselice, L Conversi, Y Copin, L Corcione, A Costille, F Courbin, H Degaudenzi, M Douspis, F Dubath, CAJ Duncan, S Dusini, S Farrens, S Ferriol, P Fosalba, N Fourmanoit, M Frailis, E Franceschi, P Franzetti, M Fumana, B Gillis, C Giocoli, A Grazian, F Grupp, SVH Haugan, W Holmes, F Hormuth, P Hudelot, S Kermiche, A Kiessling, M Kilbinger, R Kohley, B Kubik, M Kümmel, M Kunz, H Kurki-Suonio, O Lahav, S Ligori, PB Lilje, I Lloro, O Mansutti, O Marggraf, K Markovic, F Marulli, R Massey, S Maurogordato, M Melchior, E Merlin, G Meylan, JJ Mohr, M Moresco, B Morin, L Moscardini, E Munari, RC Nichol, C Padilla, S Paltani, J Peacock, K Pedersen, V Pettorino, S Pires, M Poncet, L Popa, L Pozzetti, F Raison, R Rebolo, J Rhodes, H-W Rix, M Roncarelli, E Rossetti, R Saglia, P Schneider, T Schrabback, A Secroun, G Seidel, S Serrano, C Sirignano, G Sirri, J Skottfelt, L Stanco, JL Starck, P Tallada-Crespí, D Tavagnacco, AN Taylor, HI Teplitz, R Toledo-Moreo, F Torradeflot, M Trifoglio, EA Valentijn, L Valenziano, GA Verdoes Kleijn, Y Wang, N Welikala, J Weller, M Wetzstein, G Zamorani, J Zoubian, S Andreon, M Baldi, S Bardelli, A Boucaud, S Camera, D Di Ferdinando, G Fabbian, R Farinelli, S Galeotta, J Graciá-Carpio, D Maino, E Medinaceli, S Mei, C Neissner, G Polenta, A Renzi, E Romelli, C Rosset, F Sureau, M Tenti, T Vassallo, E Zucca, C Baccigalupi, A Balaguera-Antolínez, P Battaglia, A Biviano, S Borgani, E Bozzo, R Cabanac, A Cappi, S Casas, G Castignani, C Colodro-Conde, J Coupon, HM Courtois, J Cuby, S de la Torre, S Desai, H Dole, M Fabricius, M Farina, PG Ferreira, F Finelli, P Flose-Reimberg, S Fotopoulou, K Ganga, G Gozaliasl, IM Hook, E Keihanen, CC Kirkpatrick, P Liebing, V Lindholm, G Mainetti, M Martinelli, N Martinet, M Maturi, HJ McCracken, RB Metcalf, G Morgante, J Nightingale, A Nucita, L Patrizii, D Potter, G Riccio, AG Sánchez, D Sapone, JA Schewtschenko, M Schultheis, V Scottez, R Teyssier, I Tutusaus, J Valiviita, M Viel, W Vriend, L Whittaker

Euclid: Covariance of weak lensing pseudo-Cℓ estimates

Astronomy & Astrophysics EDP Sciences 660 (2022) a114

Authors:

RE Upham, ML Brown, L Whittaker, A Amara, N Auricchio, D Bonino, E Branchini, M Brescia, J Brinchmann, V Capobianco, C Carbone, J Carretero, M Castellano, S Cavuoti, A Cimatti, R Cledassou, G Congedo, L Conversi, Y Copin, L Corcione, M Cropper, A Da Silva, H Degaudenzi, M Douspis, F Dubath, CAJ Duncan, X Dupac, S Dusini, A Ealet, S Farrens, S Ferriol, P Fosalba, M Frailis, E Franceschi, M Fumana, B Garilli, B Gillis, C Giocoli, F Grupp, SVH Haugan, H Hoekstra, W Holmes, F Hormuth, A Hornstrup, K Jahnke, S Kermiche, A Kiessling, M Kilbinger, T Kitching, M Kümmel, M Kunz, H Kurki-Suonio, S Ligori, PB Lilje, I Lloro, O Marggraf, K Markovic, F Marulli, M Meneghetti, G Meylan, M Moresco, L Moscardini, E Munari, SM Niemi, C Padilla, S Paltani, F Pasian, K Pedersen, V Pettorino, S Pires, M Poncet, L Popa, F Raison, J Rhodes, E Rossetti, R Saglia, B Sartoris, P Schneider, A Secroun, G Seidel, C Sirignano, G Sirri, L Stanco, J-L Starck, P Tallada-Crespí, D Tavagnacco, AN Taylor, I Tereno, R Toledo-Moreo, F Torradeflot, L Valenziano, Y Wang, G Zamorani, J Zoubian, S Andreon, M Baldi, S Camera, VF Cardone, G Fabbian, G Polenta, A Renzi, B Joachimi, A Hall, A Loureiro, E Sellentin

Euclid: Forecast constraints on consistency tests of the ΛCDM model⋆

Astronomy & Astrophysics EDP Sciences 660 (2022) a67

Authors:

S Nesseris, D Sapone, M Martinelli, D Camarena, V Marra, Z Sakr, J Garcia-Bellido, CJAP Martins, C Clarkson, A Da Silva, P Fleury, L Lombriser, JP Mimoso, S Casas, V Pettorino, I Tutusaus, A Amara, N Auricchio, C Bodendorf, D Bonino, E Branchini, M Brescia, V Capobianco, C Carbone, J Carretero, M Castellano, S Cavuoti, A Cimatti, R Cledassou, G Congedo, L Conversi, Y Copin, L Corcione, F Courbin, M Cropper, H Degaudenzi, M Douspis, F Dubath, CAJ Duncan, X Dupac, S Dusini, A Ealet, S Farrens, P Fosalba, M Frailis, E Franceschi, M Fumana, B Garilli, B Gillis, C Giocoli, A Grazian, F Grupp, SVH Haugan, W Holmes, F Hormuth, K Jahnke, S Kermiche, A Kiessling, T Kitching, M Kümmel, M Kunz, H Kurki-Suonio, S Ligori, PB Lilje, I Lloro, O Mansutti, O Marggraf, K Markovic, F Marulli, R Massey, M Meneghetti, E Merlin, G Meylan, M Moresco, L Moscardini, E Munari, SM Niemi, C Padilla, S Paltani, F Pasian, K Pedersen, WJ Percival, M Poncet, L Popa, GD Racca, F Raison, J Rhodes, M Roncarelli, R Saglia, B Sartoris, P Schneider, A Secroun, G Seidel, S Serrano, C Sirignano, G Sirri, L Stanco, J-L Starck, P Tallada-Crespí, AN Taylor, I Tereno, R Toledo-Moreo, F Torradeflot, EA Valentijn, L Valenziano, Y Wang, N Welikala, G Zamorani, J Zoubian, S Andreon, M Baldi, S Camera, E Medinaceli, S Mei, A Renzi

Forecasting the potential of weak lensing magnification to enhance LSST large-scale structure analyses

Monthly Notices of the Royal Astronomical Society 91̽�� University Press 513:1 (2022) 1210-1228

Authors:

C Mahony, Mc Fortuna, B Joachimi, A Korn, H Hoekstra, Sj Schmidt, D Alonso, S Singh, M Ricci, H Hildebrandt, C Duncan, H Johnston

Abstract:

Recent works have shown that weak lensing magnification must be included in upcoming large-scale structure analyses, such as for the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), to avoid biasing the cosmological results. In this work, we investigate whether including magnification has a positive impact on the precision of the cosmological constraints, as well as being necessary to avoid bias. We forecast this using an LSST mock catalogue and a halo model to calculate the galaxy power spectra. We find that including magnification has little effect on the precision of the cosmological parameter constraints for an LSST galaxy clustering analysis, where the halo model parameters are additionally constrained by the galaxy luminosity function. In particular, we find that for the LSST gold sample (i < 25.3) including weak lensing magnification only improves the galaxy clustering constraint on.

91̽��