Search Publications
A universal correlation between warm and hot gas in the stripped tails of cluster galaxies
Yoshida, Michitoshi; Fossati, Matteo; Nulsen, Paul E. J. +7 more
The impact of ram pressure stripping on galaxy evolution is well known (for example, ref. 1). Recent multi-wavelength data have revealed many examples of galaxies undergoing stripping, often accompanied with multi-phase tails2-13. As energy transfer in the multi-phase medium is an outstanding question in astrophysics, galaxie…
Transforming gas-rich low-mass disky galaxies into ultra-diffuse galaxies by ram pressure
Fabricant, Daniel; Yagi, Masafumi; Afanasiev, Anton V. +4 more
Faint extended elliptically shaped ultra-diffuse galaxies and slightly brighter and more compact dwarf elliptical and lenticular stellar systems are common in galaxy clusters. Their poorly constrained evolutionary paths can be studied by identifying young ultra-diffuse galaxy and dwarf elliptical analogues populated with bright, massive stars. Usi…
The origin of reconnection-mediated transient brightenings in the solar transition region
Winebarger, Amy R.; Bahauddin, Shah Mohammad; Bradshaw, Stephen J.
The ultraviolet emission from the solar transition region is dominated by dynamic, low-lying magnetic loops. The enhanced spatial and temporal resolution of the solar observation satellite Interface Region Imaging Spectrograph (IRIS) has made it possible to study these structures in fine detail. IRIS has observed `transient brightenings' in these …
Anoxic chemical weathering under a reducing greenhouse on early Mars
Liu, J.; Xiao, L.; Michalski, J. R. +3 more
Reduced greenhouse gases such as methane (CH4) and hydrogen (H2) might be the only tenable solution to explain warming of the ancient Martian climate, but direct geological evidence that a reduced atmosphere actually existed on Mars has been lacking. Here we report widespread, strong Fe loss in chemically weathered bedrock se…
Bayesian analysis of Enceladus's plume data to assess methanogenesis
Affholder, Antonin; Guyot, François; Sauterey, Boris +2 more
Observations from NASA's Cassini spacecraft established that Saturn's moon Enceladus has an internal liquid ocean. Analysis of a plume of ocean material ejected into space suggests that alkaline hydrothermal vents are present on Enceladus's seafloor. On Earth, such deep-sea vents harbour microbial ecosystems rich in methanogenic archaea. Here we u…
The Sun's dynamic extended corona observed in extreme ultraviolet
Seaton, Daniel B.; Caspi, Amir; Slater, Gregory +6 more
The `middle corona' is a critical transition between the highly disparate physical regimes of the lower and outer solar coronae. Nonetheless, it remains poorly understood due to the difficulty of observing this faint region (1.5-3 R⊙). New observations from the Solar Ultraviolet Imager of a Geostationary Operational Environmental Satell…
Dust/ice mixing in cold regions and solid-state water in the diffuse interstellar medium
Henning, Thomas; Bouwman, Jeroen; Jäger, Cornelia +1 more
Whether ice in cold cosmic environments is physically separated from the silicate dust or mixed with individual silicate moieties is not known. However, different grain models give very different compositions and temperatures of grains. The aim of the present study is to compare the mid-infrared spectra of laboratory silicate grain/water ice mixtu…
A Solar System formation analogue in the Ophiuchus star-forming complex
Alves, João; Lin, Douglas N. C.; Forbes, John C.
Anomalies among the daughter nuclei of the extinct short-lived radionuclides in calcium-aluminium-rich inclusions indicate that the Solar System must have been born near a source of the short-lived radionuclides so that they could be incorporated before they decayed away1. γ-rays from one such living short-lived radionuclide, 26
The magnetic field across the molecular warped disk of Centaurus A
Lopez-Rodriguez, Enrique
Magnetic fields are amplified as a consequence of galaxy formation and turbulence-driven dynamos. Galaxy mergers can potentially amplify the magnetic fields from their progenitors, making the magnetic fields dynamically important. However, the effect of mergers on magnetic fields is still poorly understood. We use thermal polarized emission observ…
Slowly cooling white dwarfs in M13 from stable hydrogen burning
Cadelano, Mario; Pallanca, Cristina; Dalessandro, Emanuele +5 more
White dwarfs (WDs) are the final evolutionary product of the vast majority of stars in the Universe. They are electron-degenerate structures characterized by no stable thermonuclear activity, and their evolution is generally described as a pure cooling process. Their cooling rate is adopted as cosmic chronometer to constrain the age of several Gal…