3 papers
astro-ph.GA2026
The initial conditions and initial mass functions of Alpha Persei, Pleiades and Praesepe
L. Hobart, H. Baumgardt, S. Sweet
We have determined the initial mass function (IMF) and structural properties of the open clusters Alpha Persei, Pleiades and Praesepe using Gaia DR3 astrometry and photometry. Clus…
astro-ph.GA2025
The coherent satellite velocity field around the interacting spiral galaxy pair NGC5713/19: signature of two galaxy groups merging
Helmut Jerjen, Simon Deeley, Holger Baumgardt +1
The luminous spirals NGC5713 and NGC5719 form an interacting galaxy pair 94 kpc apart and are connected by a straight, elongated neutral hydrogen structure extending over 200 kpc.…
astro-ph.GA2025
Reevaluating UMa3/U1: star cluster or the smallest known galaxy?
Scot Devlin, Holger Baumgardt, Sarah M. Sweet
Ursa Major III/UNIONS 1 (UMa3/U1) is the faintest Milky Way satellite discovered to date, exhibiting a half-light radius of 3 1 pc and an absolute V-band magnitude of +2.2 $\…