EMERGE – an empirical model for the formation of galaxies since z ∼ 10

By B. Moster, T. Naab, Simon D. M. White. 2017

249 citations recorded by the source corpus.

We present EMERGE, an Empirical ModEl for the foRmation of GalaxiEs, describing the evolution of individual galaxies in large volumes from z similar to 10 to the present day. We assign a star formation rate to each dark matter halo based on its growth rate, which specifies how much baryonic material becomes available, and the instantaneous baryon conversion efficiency, which determines how efficiently this material is converted to stars, thereby capturing the baryonic physics. Satellites are quenched following the delayed-then-rapid model, and they are tidally disrupted once their subhalo has lost a significant fraction of its mass. The model is constrained with observed data extending out to high redshift. The empirical relations are very flexible, and the model complexity is increased only if required by the data, assessed by several model selection statistics. We find that for the same final halo mass galaxies can have very different star formation histories. Galaxies that are quenched at z = 0 typically have a higher peak star formation rate compared to their star-forming counterparts. EMERGE predicts stellar-to-halo mass ratios for individual galaxies and introduces scatter self-consistently. We find that at fixed halo mass, passive galaxies have a higher stellar mass on average. The intracluster mass in massive haloes can be up to eight times larger than the mass of the central galaxy. Clustering for star-forming and quenched galaxies is in good agreement with observational constraints, indicating a realistic assignment of galaxies to haloes.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/ed33d79cda1bec9f8bf84f78de515c08c0f3cfe8

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. C. Conroy
2. Risa Wechsler
3. P. Behroozi
4. Andrew P. Hearin
5. M. Ouchi
6. Y. Harikane
7. Yoshiaki Ono
8. Andrey V. Kravtsov

In Instrumentation

1. C. Conroy
2. P. Behroozi
3. Risa Wechsler
4. Andrew P. Hearin
5. M. Ouchi
6. Benjamin D. Johnson
7. Y. Harikane
8. Yoshiaki Ono

Citations in the corpus

• A Comprehensive Study of Galaxies at z ∼ 9–16 Found in the Early JWST Data: Ultraviolet Luminosity Functions and Cosmic Star Formation History at the Pre-reionization Epoch (2022, methodology): “The UV luminosity function measurements provide the physical picture of galaxy formation over the redshift range of z∼ 0–10, tying galaxies and dark matter halos via abundancematching techniques (e.g., Behroozi et al. 2013, 2019; Moster et al. 2013, 2018; Finkelstein et al. 2015b).”
• A Redshift-independent Efficiency Model: Star Formation and Stellar Masses in Dark Matter Halos at z ≳ 4 (2018, background): “…the Moster et al. (2018) and Behroozi et al. (2018, in prep.) models not only predict a different stellar-to-halo mass relations at z = 4 − 8, but while Moster et al. (2018) predicts only little evolution, Behroozi et al. (2018, in prep.) predicts a significant evolution with redshift.”
• UniverseMachine: The correlation between galaxy growth and dark matter halo assembly from z = 0−10 (2018, methodology): “6 of Moster et al. (2018).”