Beecroft Institute for Particle Astrophysics and Cosmology

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The catalog-to-cosmology framework for weak lensing and galaxy clustering for LSST

(2022)

Authors:

J Prat, J Zuntz, Y Omori, C Chang, T Tröster, E Pedersen, C García-García, E Phillips-Longley, J Sanchez, D Alonso, X Fang, E Gawiser, K Heitmann, M Ishak, M Jarvis, E Kovacs, P Larsen, Y-Y Mao, L Medina Varela, M Paterno, SD Vitenti, Z Zhang, The LSST Dark Energy Science Collaboration

The evolution of the galaxy UV luminosity function at redshifts z ≃ 8 – 15 from deep JWST and ground-based near-infrared imaging

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 518:4 (2022) 6011-6040

Authors:

CT Donnan, DJ McLeod, JS Dunlop, RJ McLure, AC Carnall, R Begley, F Cullen, ML Hamadouche, RAA Bowler, D Magee, HJ McCracken, B Milvang-Jensen, A Moneti, T Targett

Star formation history and transition epoch of cluster galaxies based on the Horizon-AGN simulation

Astrophysical Journal American Astronomical Society 941:1 (2022) 5

Authors:

Seyoung Jeon, Sukyoung K Yi, Yohan Dubois, Aeree Chung, Julien Devriendt, San Han, Ryan A Jackson, Taysun Kimm, Christophe Pichon, Jinsu Rhee

Abstract:

Cluster galaxies exhibit substantially lower star formation rates than field galaxies today, but it is conceivable that clusters were sites of more active star formation in the early universe. Herein, we present an interpretation of the star formation history (SFH) of group/cluster galaxies based on the large-scale cosmological hydrodynamic simulation, Horizon-AGN. We find that massive galaxies in general have small values of e-folding timescales of star formation decay (i.e., "mass quenching") regardless of their environment, while low-mass galaxies exhibit prominent environmental dependence. In massive host halos (i.e., clusters), the e-folding timescales of low-mass galaxies are further decreased if they reside in such halos for a longer period of time. This "environmental quenching" trend is consistent with the theoretical expectation from ram pressure stripping. Furthermore, we define a "transition epoch" as where cluster galaxies become less star-forming than field galaxies. The transition epoch of group/cluster galaxies varies according to their stellar and host-cluster halo masses. Low-mass galaxies in massive clusters show the earliest transition epoch of ∼7.6 Gyr ago in lookback time. However, this decreases to ∼5.2 Gyr for massive galaxies in low-mass clusters. Based on our findings, we can describe a cluster galaxy's SFH with regard to the cluster halo-to-stellar mass ratio.

Spatially Homogeneous Universes with Late-Time Anisotropy

(2022)

Authors:

Andrei CONSTANTIN, Thomas R Harvey, Sebastian VON HAUSEGGER, Andre Lukas

Constraining ultra-high-energy cosmic ray composition through cross-correlations

Journal of Cosmology and Astroparticle Physics IOP Publishing 2022:12 (2022) 003-003

Authors:

Konstantinos Tanidis, Federico R Urban, Stefano Camera

Abstract:

Abstract The chemical composition of the highest end of the ultra-high-energy cosmic ray spectrum is very hard to measure experimentally, and to this day it remains mostly unknown. Since the trajectories of ultra-high-energy cosmic rays are deflected in the magnetic field of the Galaxy by an angle that depends on their atomic number Z, it could be possible to indirectly measure Z by quantifying the amount of such magnetic deflections. In this paper we show that, using the angular harmonic cross-correlation between ultra-high-energy cosmic rays and galaxies, we could effectively distinguish different atomic numbers with current data. As an example, we show how, if Z = 1, the cross-correlation can exclude a 39% fraction of Fe56 nuclei at 2σ for rays above 100 EeV.