Argelander-Institut für Astronomie

Nov 18, 2024 | academic.oup.com | Argelander-Institut für Astronomie

The two systems, namely, Gaia BH1 and Gaia BH2, that have been confirmed as dormant (i.e., no X-ray emission detected) black hole (BH) - low-mass star binaries in the latest Gaia mission data release (DR3) are intriguing in the context of their formation and evolution. Both systems consist of BH and star orbiting each other on a wide, eccentric orbit (e ∼ 0.5).

Aug 1, 2024 | academic.oup.com | Instituto de Astronomia |Argelander-Institut für Astronomie |Departamento de Astronomía |Universidad de Concepcion

Galaxy interaction and merging significantly impact galactic evolution, influencing the morphology and growth of galaxies (Toomre 1977; Conselice et al. 2003; Christensen, Shida & Martin 2009; Kormendy 2013). In addition, galaxy interaction/merging affects star formation, gas recycling, metallicity enrichment, and energy output from supernovae or active galactic nuclei (Kormendy & Kennicutt 2004; Kormendy 2013).

Mar 28, 2024 | academic.oup.com | Astroparticle Physics |Argelander-Institut für Astronomie |Universität Bonn

We present observations of the central 9 kpc of the Antennae merger (NGC 4038/9) at 55 pc resolution in the CO (2–1) line obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). We use a pixel-based analysis to compare the gas properties in the Antennae to those in 70 nearby spiral galaxies from the PHANGS-ALMA survey, as well as the merger and nearest luminous infrared galaxy NGC 3256.

Dec 23, 2023 | academic.oup.com | Max-Planck-Institut für Radioastronomie |Argelander-Institut für Astronomie |Universität Bonn |Nicolaus Copernicus

We have used data from the Outer Galaxy High-Resolution Survey (OGHReS) to refine the velocities, distances, and physical properties of a large sample of 3 584 clumps detected in far infrared/submillimetre emission in the Hi-GAL survey located in the ℓ = 250○ − 280○ region of the Galactic plane. Using 12CO and 13CO spectra, we have determined reliable velocities to 3 412 clumps (95 per cent of the sample).

Dec 21, 2023 | academic.oup.com | Departamento de Astronomía |Universidad de Concepcion |Argelander-Institut für Astronomie

We use high-resolution zoom-in simulations to study the fueling of central galaxies by filamentary and diffuse accretion at redshifts, z ≳ 2. The parent haloes were chosen with similar total masses, log (M /M ) ∼ 11.75 ± 0.05, at z = 6, 4, and 2, in high/low overdensity environments. We analyze the kinematic and thermodynamic properties of circumgalactic medium (CGM) within few virial radii, R , and down to the central galaxy.