Carnegie Observatories

Oct 15, 2024 | academic.oup.com | Carnegie Observatories |Swathya Singh

The JWST is allowing new measurements of gas-phase metallicities in galaxies between cosmic noon and cosmic dawn. The most robust approach uses luminosity ratios between the excited auroral transition, [O iii] 4364 Å, and the lower [O iii] 5008 Å/4960 Å lines to determine the gas temperature. The ratio of the luminosities in the latter transitions to those in hydrogen Balmer series lines then yield relatively clean metallicity estimates.

Oct 15, 2024 | academic.oup.com | Carnegie Observatories |Los Alamos |Swathya Singh

One key to tracing and understanding galaxy formation and evolution is to determine the cosmic chemical enrichment history. An important goal here is to robustly determine the average redshift evolution of the gas-phase metallicity in the interstellar medium (ISM) of distant galaxies. In addition, there is a ‘mass–metallicity relationship’, expressing correlations between the gas-phase metallicity and stellar mass (e.g. Tremonti et al. 2004; Lee et al. 2006; Maiolino et al. 2008; Mannucci et al.

Aug 29, 2024 | academic.oup.com | Carnegie Observatories |Los Alamos |Tat Chee |Zhichao Carton

Dark matter is a necessary ingredient to the Standard Model of Cosmology. Yet, its particle nature remains mysterious. Self-interacting dark matter (SIDM) is an alternative theory to the standard cold collisionless dark matter (CDM) model. In addition to gravitational interactions, dark matter (DM) particles can also have sizable self-interactions that allow them to scatter off with each other.

Oct 23, 2023 | academic.oup.com | Carnegie Observatories

We present in this paper a public data release of an unprecedentedly-large set of core-collapse supernova (CCSN) neutrino emission models, comprising one hundred detailed 2D-axisymmetric radiation-hydrodynamic simulations evolved out to as late as ∼5 seconds post-bounce and spanning a extensive range of massive-star progenitors.

Oct 23, 2023 | academic.oup.com | Carnegie Observatories

Core-collapse supernova (CCSN) theory has evolved significantly over the last six decades (Janka 2012; Burrows 2013; Müller et al. 2017; O’Connor & Couch 2018b; Ott et al. 2018; Vartanyan et al. 2018; Burrows, Radice & Vartanyan 2019; Glas et al. 2019; Burrows et al. 2020; Vartanyan & Burrows 2020; Burrows & Vartanyan 2021; Tsang, Vartanyan & Burrows 2022; Vartanyan, Coleman & Burrows 2022; Wang et al. 2022) and has reached a pivotal juncture in its history.