Search Publications
Gas and galaxies in filaments between clusters of galaxies. The study of A399-A401
Aghanim, N.; Douspis, M.; Salomé, P. +2 more
We have performed a multi-wavelength analysis of two galaxy cluster systems selected with the thermal Sunyaev-Zel'dovich (tSZ) effect and composed of cluster pairs and an inter-cluster filament. We have focused on one pair of particular interest: A399-A401 at redshift z ~ 0.073 seperated by 3 Mpc. We have also performed the first analysis of one l…
Polar Dust, Nuclear Obscuration, and IR SED Diversity in Type-1 AGNs
Lyu, Jianwei; Rieke, George H.
Despite the hypothesized similar face-on viewing angles, the infrared emission of type-1 active galactic nuclei (AGNs) has diverse spectral energy distribution (SED) shapes that deviate substantially from the well-characterized quasar templates. Motivated by the commonly seen UV-optical obscuration and the discovery of parsec-scale mid-IR polar du…
Photochemical Haze Formation in the Atmospheres of Super-Earths and Mini-Neptunes
Valenti, Jeff A.; Moses, Julianne I.; Marley, Mark S. +8 more
UV radiation can induce photochemical processes in exoplanet atmospheres and produce haze particles. Recent observations suggest that haze and/or cloud layers could be present in the upper atmospheres of exoplanets. Haze particles play an important role in planetary atmospheres and may provide a source of organic material to the surface that may i…
Formation and dynamics of a solar eruptive flux tube
Kusano, Kanya; Inoue, Satoshi; Büchner, Jörg +1 more
Solar eruptions are well-known drivers of extreme space weather, which can greatly disturb the Earth's magnetosphere and ionosphere. The triggering process and initial dynamics of these eruptions are still an area of intense study. Here we perform a magnetohydrodynamic simulation taking into account the observed photospheric magnetic field to reve…
Statistics of Coronal Dimmings Associated with Coronal Mass Ejections. I. Characteristic Dimming Properties and Flare Association
Temmer, M.; Veronig, A. M.; Vanninathan, K. +2 more
Coronal dimmings, localized regions of reduced emission in the extreme-ultraviolet and soft X-rays (SXRs), are interpreted as density depletions due to mass loss during the coronal mass ejection (CME) expansion. They contain crucial information on the early evolution of CMEs low in the corona. For 62 dimming events, characteristic parameters are d…
HDUV: The Hubble Deep UV Legacy Survey
Oesch, P. A.; Carollo, C. M.; Nelson, E. J. +15 more
We present the Hubble Deep UV Legacy Survey (HDUV), a 132-orbit imaging program with the WFC3/UVIS camera on board the Hubble Space Telescope (HST). The HDUV extends and builds on the few previous UV imaging surveys in the two GOODS/CANDELS-Deep fields to provide deep images over a total area of ∼100 arcmin2 in the two filters F275W and…
Venus: The Atmosphere, Climate, Surface, Interior and Near-Space Environment of an Earth-Like Planet
Head, James W.; Taylor, Fredric W.; Svedhem, Håkan
This is a review of current knowledge about Earth's nearest planetary neighbour and near twin, Venus. Such knowledge has recently been extended by the European Venus Express and the Japanese Akatsuki spacecraft in orbit around the planet; these missions and their achievements are concisely described in the first part of the review, along with a su…
The young star cluster population of M51 with LEGUS - II. Testing environmental dependences
Östlin, G.; Dale, D. A.; Calzetti, D. +16 more
It has recently been established that the properties of young star clusters (YSCs) can vary as a function of the galactic environment in which they are found. We use the cluster catalogue produced by the Legacy Extragalactic UV Survey (LEGUS) collaboration to investigate cluster properties in the spiral galaxy M51. We analyse the cluster populatio…
Star formation history of the Galactic bulge from deep HST imaging of low reddening windows
Hill, Vanessa; Di Matteo, Paola; Haywood, Misha +3 more
Despite the huge amount of photometric and spectroscopic efforts targeting the Galactic bulge over the past few years, its age distribution remains controversial owing to both the complexity of determining the age of individual stars and the difficult observing conditions. Taking advantage of the recent release of very deep, proper-motion-cleaned …
HAZMAT. IV. Flares and Superflares on Young M Stars in the Far Ultraviolet
Loyd, R. O. Parke; Peacock, Sarah; Meadows, Victoria S. +4 more
M stars are powerful emitters of far-ultraviolet light. Over long timescales, a significant, possibly dominant, fraction of this emission is produced by stellar flares. Characterizing this emission is critical to understanding the atmospheres of the stars producing it and the atmospheric evolution of the orbiting planets subjected to it. Ultraviol…