Search Publications
Shocks and Molecules in Diffuse Interstellar Cloud Pairs
Heiles, Carl; Reach, William T.
The diffuse interstellar medium (ISM) is dynamic, and its chemistry and evolution are determined by shock fronts as well as photodissociation. Shocks are implied by the supersonic motions and velocity dispersion, often statistically called "turbulence". We compare models of magnetohydrodynamic (MHD) shocks, with speeds typical of cloud motions thr…
Intermittent warmth on young Mars
Mangold, Nicolas
Warm and wet conditions could have episodically punctuated a generally cold early climate on Mars, according to a multidisciplinary modelling approach that potentially solves a five-decade long debate regarding warm conditions on early Mars.
The thermal emission of Saturn's icy moons. Effects of topography and regolith properties
Lucas, A.; Ferrari, C.; Jacquemoud, S.
Context. The effects of space weathering and other alteration processes on the upper surface of Saturn's icy moons are yet to be explored.
Aims: We present a thermophysical model parametrised by way of regolith properties such as porosity, grain size, and composition, as well as the local topography. The modelled surface temperature and appar…
An association of CMEs with solar flares detected by Fermi γ-ray burst monitor during solar cycle 24
Abdel-Sattar, Walid; Mawad, Ramy; Farid, Hussein M.
By performing certain spatial and temporal criteria, we obtained 492 CME events simultaneously associated with GBM solar flare events (hereafter, GBM-flare-CME) from the total number 5123 Gamma-ray Burst Monitor (GBM) solar flares and 15228 Coronal Mass Ejections (CMEs) detected during the solar cycle 24 (2008-2019). Among these 492 events, which …
Globular Cluster Candidates in the Sagittarius Dwarf Galaxy
Piatti, Andrés E.
Recently, new Sagittarius (Sgr) dwarf-galaxy globular clusters were discovered, which opens the question of the actual size of the Sgr globular cluster population, and therefore on our understanding of the Sgr galaxy formation and accretion history of the Milky Way. Based on Gaia EDR3 and SDSS IV DR16 (APOGEE-2) data sets, we performed an analysis…
Spatial statistics in star-forming regions: is star formation driven by column density alone?
Naylor, T.; Hatchell, J.; Retter, B.
Star formation is known to occur more readily where more raw materials are available. This is often expressed by a 'Kennicutt-Schmidt' relation where the surface density of young stellar objects (YSOs) is proportional to column density to some power, µ. The aim of this work was to determine if column density alone is sufficient to explain th…
A three-dimensional velocity of an erupting prominence prior to a coronal mass ejection
Shibata, Kazunari; Ishii, Takako T.; Kitai, Reizaburo +10 more
We present a detailed three-dimensional (3D) view of a prominence eruption, coronal loop expansion, and coronal mass ejections (CMEs) associated with an M4.4 flare that occurred on 2011 March 8 in the active region NOAA 11165. Full-disk Hα images of the flare and filament ejection were successfully obtained by the Flare Monitoring Telescope (FMT) …
Physical Characteristics of Unstructured Coronal Clouds
Golub, L.; Hahn, M.; Savin, D. W. +2 more
Active regions in the inner solar corona, when observed in X-ray emission, consist of bright, hot loops surrounded by unstructured clouds. The emission from the clouds extends to a height of ≈4-5 × 104 km at temperatures of ≈2-3 MK. These "hot clouds" are variable, but persist for many days and do not appear to connect directly to the a…
INTEGRAL View of TeV Sources: A Legacy for the CTA Project
Ubertini, Pietro; Bazzano, Angela; Bird, Antony J. +7 more
Investigations that were carried out over the last two decades with novel and more sensitive instrumentation have dramatically improved our knowledge of the more violent physical processes taking place in galactic and extra-galactic Black-Holes, Neutron Stars, Supernova Remnants/Pulsar Wind Nebulae, and other regions of the Universe where relativi…
Titan's Global Radiant Energy Budget During the Cassini Epoch (2004-2017)
West, Robert A.; Nixon, Conor A.; Fry, Patrick M. +5 more
Radiant energies of planets and moons are of wide interest in the fields of geoscience and planetary science. Based on long-term multiinstrument observations from the Cassini spacecraft, we provide here the first observational study of Titan's global radiant energy budget and its seasonal variations. Our results show that Titan's radiant energy bu…