Hamburger Sternwarte

Jan 15, 2025 | aanda.org | Diego Calderon |Hamburger Sternwarte |Universität Hamburg |Jorge Cuadra

A&A, 693, A180 (2025) The formation and stability of a cold disc made out of stellar winds in the Galactic centre 1,2,★,★★, 3,4, 5, 6,7,8, 1,9 and 10 1 Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany 2 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Straße 1, 85748 Garching, Germany 3 Departamento de Ciencias, Facultad de Artes Liberales, Universidad Adolfo Ibáñez, Av. Padre Hurtado 750, Viña del Mar, Chile 4 Millennium Nucleus on Transversal...

Nov 26, 2024 | academic.oup.com | Hamburger Sternwarte |Universität Hamburg |Carnegie Mellon

Galaxy clusters have long been considered a promising astrophysical probes of dark energy (Albrecht et al. 2006; Allen, Evrard & Mantz 2011; Dodelson et al. 2016) as their abundance as a function of redshift and mass is sensitive to the growth rate of structures in the Universe. Clusters are complementary to geometry based probes such as type-Ia supernovae and can be used to test different dark energy models (Huterer 2023).

Oct 21, 2024 | academic.oup.com | Hamburger Sternwarte

Galactic winds are complex, multifaceted outflows of matter and energy that arise in star-forming galaxies (see a recent review by Faucher-Giguère & Oh 2023). These winds are made of molecular, atomic, and ionized components, which despite having specific densities and temperatures coexist along the outflow (e.g. see Di Teodoro et al. 2020; Ponti et al. 2021; Veena et al. 2023 for the nuclear wind in our Galaxy, and Westmoquette, Smith & Gallagher 2008; Veilleux et al. 2021; Li et al.

Aug 22, 2024 | academic.oup.com | Hamburger Sternwarte

The backbone of the universe is the cosmic web: an intricate network of filaments interconnected with galaxy clusters. The thermal plasma that fills filaments (the Warm Hot Intergalactic Medium) and galaxy clusters (the Intra Cluster Medium, ICM) is permeated by weak magnetic fields (0.01–10 μG) whose origin and evolution have attracted increasing attention in the scientific community in recent years (see e.g. Vazza et al. 2021a; Carretti et al. 2023).

Feb 13, 2024 | academic.oup.com | Hamburger Sternwarte

Neutron star (NS) mergers where both stars have negligible spins are commonly considered as the most likely “standard” case. In globular clusters, however, the majority of NSs have been spun up to millisecond (ms) periods and, based on observed systems, we estimate that a non-negligible fraction of all double NS mergers (⁠ ⁠) contains one component with a spin of a (few) ms.