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13 papers · 2 filters
The properties of He II 1640 emitters at z ~ 2.5-5 from the VANDELS survey
A. Saxena, L. Pentericci, M. Mirabelli +24
Strong He II emission is produced by low-metallicity stellar populations. Here, we aim to identify and study a sample of He II -emitting galaxies at redshifts of $z \sim 2.5…
The impact of quenching on galaxy profiles in the Simba simulation
Sarah Appleby, Romeel Davé, Katarina Kraljic +2
We study specific star formation rate (sSFR) and gas profiles of star forming and green valley galaxies in the Simba cosmological hydrodynamic simulation. Star-forming galaxy half-…
The fate of the interstellar medium in early-type galaxies. I. First direct measurement of the timescale of dust removal
Michał J. Michałowski, J. Hjorth, C. Gall +12
An important aspect of quenching star formation is the removal of the cold interstellar medium (ISM; non-ionised gas and dust) from a galaxy. In addition, dust grains can be destro…
Development of Hydrogen and Helium Proximity Zones around Quasars
W. Zheng, A. Meiksin, D. Syphers
Increasing evidence suggests that He II proximity profiles in the quasar spectra at z ~ 3 - 4 are sensitive probes of quasar ages. But the development of their H I counterparts is…
A new formulation of the external field effect in MOND and numerical simulations of ultra-diffuse dwarf galaxies application to NGC 1052-DF2 and NGC 1052-DF4
Hosein Haghi, Pavel Kroupa, Indranil Banik +7
The ultra-diffuse dwarf galaxy NGC 1052-DF2 (DF2) has ten (eleven) measured globular clusters (GCs) with a line-of-sight velocity dispersion of km/s ($σ=10.6…
Influence of galactic arm scale dynamics on the molecular composition of the cold and dense ISM II. Molecular oxygen abundance
V. Wakelam, M. Ruaud, P. Gratier +1
Molecular oxygen has been the subject of many observational searches as chemical models predicted it to be a reservoir of oxygen. Although it has been detected in two regions of th…