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The ACS Fornax Cluster Survey. III. Globular Cluster Specific Frequencies of Early-type Galaxies
Jordán, Andrés; Côté, Patrick; Peng, Eric W. +4 more
The globular cluster (GC) specific frequency (S N ), defined as the number of GCs per unit galactic luminosity, represents the efficiency of GC formation (and survival) compared to field stars. Despite the naive expectation that star cluster formation should scale directly with star formation, this efficiency varies widely across galax…
Variable emission mechanism of a Type IV radio burst
Kilpua, E. K. J.; Monstein, C.; Morosan, D. E. +1 more
Context. The Sun is an active star and the source of the largest explosions in the solar system, such as flares and coronal mass ejections (CMEs). Flares and CMEs are powerful particle accelerators that can generate radio emission through various emission mechanisms.
Aims: CMEs are often accompanied by Type IV radio bursts that are observed a…
Cool circumgalactic gas of passive galaxies from cosmological inflow
Afruni, Andrea; Fraternali, Filippo; Pezzulli, Gabriele
The circumgalactic medium (CGM) of galaxies consists of a multi-phase gas with components at very different temperatures, from 104 K to 107 K. One of the greatest puzzles about this medium is the presence of a large amount of low-temperature (T ∼ 104 K) gas around quiescent early-type galaxies (ETGs). Using semi-an…
Implications of a Time-varying Galactic Potential for Determinations of the Dynamical Surface Density
Hernquist, Lars; Famaey, Benoit; Haines, Tim +2 more
We analyze a high-resolution N-body simulation of a live stellar disk perturbed by the recent passage of a massive dwarf galaxy that induces a wobble, in-plane rings, and phase spirals in the disk. The implications of the phase-space structures and the estimate of the matter density through traditional Jeans modeling are investigated. The dwarf sa…
The Effects of Solar Wind Dynamic Pressure on the Structure of the Topside Ionosphere of Mars
Gurnett, D. A.; Morgan, D. D.; Kopf, A. J. +3 more
We use Mars Atmosphere and Volatile EvolutioN observations of the upstream solar wind, and Mars Express observations of ionospheric electron densities and magnetic fields, to study how the topside ionosphere (>320 km) of Mars is affected by variations in solar wind dynamic pressure. We find that high solar wind dynamic pressures result in the t…
New Substellar Discoveries from Kepler and K2: Is There a Brown Dwarf Desert?
Latham, David W.; Carmichael, Theron W.; Vanderburg, Andrew M.
We present the discoveries of a brown dwarf (BD) and a low-mass star from the Kepler and K2 missions. The newly discovered BD is EPIC 212036875b and the low-mass star is KOI-607b. EPIC 212036875b has a mass of M b = 52.3 ± 1.9 M J, a radius of R b = 0.874 ± 0.017 R J, and orbits its host star in P = …
Formation of globular cluster systems - II. Impact of the cut-off of the cluster initial mass function
Gnedin, Oleg Y.; Choksi, Nick
Observations of young star clusters reveal that the high-mass end of the cluster initial mass function (CIMF) deviates from a pure power law and instead truncates exponentially. We investigate the effects of this truncation on the formation of globular cluster (GC) systems by updating our analytic model for cluster formation and evolution, which i…
Ultra-bright CO and [C I] Emission in a Lensed z = 2.04 Submillimeter Galaxy with Extreme Molecular Gas Properties
Rebolo, R.; Krips, M.; Dannerbauer, H. +4 more
We report the very bright detection of cold molecular gas with the IRAM NOEMA interferometer of the strongly lensed source WISE J132934.18+224327.3 at z = 2.04, the so-called Cosmic Eyebrow. This source has a similar spectral energy distribution from optical-mid/IR to submillimeter/radio but significantly higher fluxes than the well-known lensed S…
Observational Analysis on the Early Evolution of a CME Flux Rope: Preflare Reconnection and Flux Rope’s Footpoint Drift
Yang, Jiayan; Ji, Kaifan; Duan, Yadan +1 more
We study the early evolution of a hot-channel-like magnetic flux rope (MFR) toward eruption. Combining with imaging observation and magnetic field extrapolation, we find that the hot channel possibly originated from a preexisting seed MFR with a hyperbolic flux tube (HFT). In the precursor phase, three-dimensional tether-cutting reconnection at th…
Dust properties and star formation of approximately a thousand local galaxies
Barmby, P.; Lehnert, M.; Lianou, S. +2 more
Aims: We derived the dust properties for 753 local galaxies and examine how these relate to some of their physical properties. We present the derived dust emission properties, including model spectral energy distribution (SEDs), star formation rates (SFRs) and stellar masses, as well as their relations.
Methods: We modelled the global du…