Beecroft Institute for Particle Astrophysics and Cosmology

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EDGE: the shape of dark matter haloes in the faintest galaxies

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 525:3 (2023) 3516-3532

Authors:

Matthew DA Orkney, Ethan Taylor, Justin I Read, Martin P Rey, A Pontzen, Oscar Agertz, Stacy Y Kim, Maxime Delorme
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The BACCO simulation project: biased tracers in real space

Monthly Notices of the Royal Astronomical Society 524:2 (2023) 2407-2419

Authors:

M Zennaro, RE Angulo, M Pellejero-Ibáñez, J Stücker, S Contreras, G Aricò

Abstract:

We present an emulator for the two-point clustering of biased tracers in real space. We construct this emulator using neural networks calibrated with more than 400 cosmological models in a 8D cosmological parameter space that includes massive neutrinos an dynamical dark energy. The properties of biased tracers are described via a Lagrangian perturbative bias expansion which is advected to Eulerian space using the displacement field of numerical simulations. The cosmology-dependence is captured thanks to a cosmology-rescaling algorithm. We show that our emulator is capable of describing the power spectrum of galaxy formation simulations for a sample mimicking that of a typical Emission-Line survey at z ∼1 with an accuracy of up to non-linear scales.
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EDGE -- Dark matter or astrophysics? Breaking dark matter heating degeneracies with HI rotation in faint dwarf galaxies

(2023)

Authors:

Martin P Rey, Matthew DA Orkney, Justin I Read, Payel Das, Oscar Agertz, Andrew Pontzen, Anastasia A Ponomareva, Stacy Y Kim, William McClymont
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Euclid preparation. XXXIV. The effect of linear redshift-space distortions in photometric galaxy clustering and its cross-correlation with cosmic shear

(2023)

Authors:

Euclid Collaboration, K Tanidis, VF Cardone, M Martinelli, I Tutusaus, S Camera, N Aghanim, A Amara, S Andreon, N Auricchio, M Baldi, S Bardelli, E Branchini, M Brescia, J Brinchmann, V Capobianco, C Carbone, J Carretero, S Casas, M Castellano, S Cavuoti, A Cimatti, R Cledassou, G Congedo, L Conversi, Y Copin, L Corcione, F Courbin, HM Courtois, A DaSilva, H Degaudenzi, J Dinis, F Dubath, X Dupac, S Dusini, M Farina, S Farrens, S Ferriol, P Fosalba, M Frailis, E Franceschi, M Fumana, S Galeotta, B Garilli, W Gillard, B Gillis, C Giocoli, A Grazian, F Grupp, L Guzzo, SVH Haugan, W Holmes, I Hook, A Hornstrup, K Jahnke, B Joachimi, E Keihanen, S Kermiche, A Kiessling, M Kunz, H Kurki-Suonio, PB Lilje, V Lindholm, I Lloro, E Maiorano, O Mansutti, O Marggraf, K Markovic, N Martinet, F Marulli, R Massey, S Maurogordato, E Medinaceli, S Mei, M Meneghetti, G Meylan, M Moresco, L Moscardini, E Munari, S-M Niemi, C Padilla, S Paltani, F Pasian, K Pedersen, WJ Percival, V Pettorino, S Pires, G Polenta, JE Pollack, M Poncet, LA Popa, F Raison, A Renzi, J Rhodes, G Riccio, E Romelli, M Roncarelli, E Rossetti, R Saglia, D Sapone, B Sartoris, M Schirmer, P Schneider, A Secroun, G Seidel, S Serrano, C Sirignano, G Sirri, L Stanco, P Tallada-Crespí, AN Taylor, I Tereno, R Toledo-Moreo, F Torradeflot, EA Valentijn, L Valenziano, T Vassallo, A Veropalumbo, Y Wang, J Weller, G Zamorani, J Zoubian, E Zucca, A Biviano, A Boucaud, E Bozzo, C Colodro-Conde, D Di Ferdinando, R Farinelli, J Graciá-Carpio, S Marcin, N Mauri, V Scottez, M Tenti, A Tramacere, Y Akrami, V Allevato, C Baccigalupi, A Balaguera-Antolínez, M Ballardini, D Benielli, F Bernardeau, S Borgani, AS Borlaff, C Burigana, R Cabanac, A Cappi, CS Carvalho, G Castignani, T Castro, G Cañas-Herrera, KC Chambers, AR Cooray, J Coupon, A Díaz-Sánchez, S Davini, S delaTorre, G DeLucia, G Desprez, S DiDomizio, H Dole, JA Escartin Vigo, S Escoffier, PG Ferreira, I Ferrero, F Finelli, L Gabarra, J García-Bellido, E Gaztanaga, F Giacomini, G Gozaliasl, H Hildebrandt, S Ilić, JJE Kajava, V Kansal, CC Kirkpatrick, L Legrand, A Loureiro, J Macias-Perez, M Magliocchetti, G Mainetti, R Maoli, CJAP Martins, S Matthew, L Maurin, RB Metcalf, M Migliaccio, P Monaco, G Morgante, S Nadathur, AA Nucita, M Pöntinen, L Patrizii, A Pezzotta, V Popa, D Potter, AG Sánchez, Z Sakr, JA Schewtschenko, A Schneider, M Sereno, P Simon, A Spurio Mancini, J Steinwagner, M Tewes, R Teyssier, S Toft, J Valiviita, M Viel, L Linke
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JADES: Discovery of extremely high equivalent width Lyman-α emission from a faint galaxy within an ionized bubble at z = 7.3

Astronomy & Astrophysics EDP Sciences 678 (2023) A68-A68

Authors:

Aayush Saxena, Brant E Robertson, Andrew J Bunker, Ryan Endsley, Alex J Cameron, Stephane Charlot, Charlotte Simmonds, Sandro Tacchella, Joris Witstok, Chris Willott, Stefano Carniani, Emma Curtis-Lake, Pierre Ferruit, Peter Jakobsen, Santiago Arribas, Jacopo Chevallard, Mirko Curti, Francesco D’Eugenio, Anna De Graaff, Gareth C Jones, Tobias J Looser, Michael V Maseda, Tim Rawle, Hans-Walter Rix, Bruno Rodríguez Del Pino, Rebecca Bowler

Abstract:

We report the discovery of a remarkable Lyα emitting galaxy at z = 7.2782, JADES-GS+53.16746-27.7720 (shortened to JADES-GS-z7-LA), with rest-frame equivalent width, EW0(Lyα) = 388.0 ± 88.8 Å and UV magnitude -17.0. The spectroscopic redshift is confirmed via rest-frame optical lines [O- ¯II], Hβ and [O- ¯III] in its JWST/NIRSpec Micro-Shutter Assembly (MSA) spectrum. The Lyα line is detected in both lower resolution (R ∼ 100) PRISM as well as medium resolution (R ∼ 1000) G140M grating spectra. The line spread function-deconvolved Lyα full width at half maximum in the grating is 383.9 ± 56.2 km s-1 and the Lyα velocity offset compared to the systemic redshift is 113.3 ± 80.0 km s-1, indicative of very little neutral gas or dust within the galaxy. We estimate the Lyα escape fraction to be > 70%. JADES-GS-z7-LA has a [O- ¯III]/[O- ¯II] ratio (O32) of 11.1 ± 2.2 and a ([O- ¯III] + [O- ¯II])/Hβ ratio (R23) of 11.2 ± 2.6, consistent with low metallicity and high ionization parameters. Deep NIRCam imaging also revealed a close companion source (separated by 0.23- ³), which exhibits similar photometry to that of JADES-GS-z7-LA, with a photometric excess in the F410M NIRCam image consistent with [O- ¯III] + Hβ emission at the same redshift. The spectral energy distribution of JADES-GS-z7-LA indicates a bursty star formation history, with a low stellar mass of 107† M·. Assuming that the Lyα transmission through the intergalactic medium is the same as its measured escape fraction, an ionized region of size > 1.5 pMpc is needed to explain the high Lyα EW and low velocity offset compared to systemic seen in JADES-GS-z7-LA. Owing to its UV-faintness, we show that it is incapable of single-handedly ionizing a region large enough to explain its Lyα emission. Therefore, we suggest that JADES-GS-z7-LA (and possibly the companion source) may be a part of a larger overdensity, presenting direct evidence of overlapping ionized bubbles at z > 7
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