Search Publications
High-speed knots in the hourglass-shaped planetary nebula Hubble 12
Pollacco, D.; López, J. A.; Rushton, A. P. +5 more
We present a detailed kinematical analysis of the young compact hourglass-shaped planetary nebula Hb 12. We performed optical imaging and long-slit spectroscopy of Hb 12 using the Manchester echelle spectrometer with the 2.1-m San Pedro Mártir telescope. We reveal, for the first time, the presence of end caps (or knots) aligned with the bipolar lo…
Characteristics of large Martian dust devils using Mars Odyssey Thermal Emission Imaging System visual and infrared images
Towner, M. C.
A search for Martian dust devils has been carried out, using Mars Odyssey Thermal Emission Imaging System (THEMIS) visible-wavelength images. Simultaneous THEMIS thermal infrared wavelength images were then processed and analyzed to investigate the thermal properties of the dust devils observed; 3079 images were checked, concentrating on northern …
Brightness power spectral distribution and waves in Jupiter's upper cloud and hazes
Sánchez-Lavega, A.; Pérez-Hoyos, S.; Barrado-Izagirre, N.
In this work we analyze the spatial structure of Jupiter's cloud reflectivity field in order to determine brightness periodicities and power spectra characteristics together with their relationship with Jupiter's dynamics and turbulence. The research is based on images obtained in the near-infrared (∼ 950 nm), blue (∼ 430 nm) and near-ultraviolet …
The star cluster population of the spiral galaxy NGC 3370
Blakeslee, J. P.; Cantiello, M.; Brocato, E.
Aims: We study the photometric and structural properties of the star cluster system in the late type Sc spiral
Methods: BVI observations from the Advanced Camera for Surveys on board of HST are used to analyse in detail the colours, magnitudes and spatial properties of cluster candidates. The final catalogue of sou…
Type II bursts in Meter and Decameter - Hectometer Wavelength Ranges and Their Relation to Flares and CMEs
Prakash, O.; Shanmugaraju, A.; Vršnak, Bojan +1 more
Statistical analysis of the relationship between type II radio bursts appearing in the metric (m) and decameter-to-hectometer (DH) wavelength ranges is presented. The associated X-ray flares and coronal mass ejections (CMEs) are also reported. The sample is divided into two classes using the frequency-drift plots: Class I, representing those event…
On the Stellar Content of the Starburst Galaxy IC10
Walker, A. R.; Prada Moroni, P. G.; Degl'Innocenti, S. +17 more
We investigate the stellar content of the starburst dwarf galaxy IC10 using accurate and deep optical data collected with the Advanced Camera for Surveys and with the Wide Field Planetary Camera 2 onboard the Hubble Space Telescope. The comparison between theory and observations indicates a clear change in age distribution when moving from the cen…
Energetic plasma sheet electrons and their relationship with the solar wind: A Cluster and Geotail study
Dandouras, I.; Baker, D. N.; Fritz, T. A. +4 more
The statistical relationship between tens of kiloelectron volts plasma sheet electrons and the solar wind, as well as >2 MeV geosynchronous electrons, is investigated using plasma sheet measurements from Cluster (2001-2005) and Geotail (1998-2005) and concurrent solar wind measurements from ACE. Plasma sheet selection criteria from previous stu…
Peculiar nature of hard X-ray eclipse in SS433 from INTEGRAL observations
Sunyaev, R. A.; Postnov, K. A.; Cherepashchuk, A. M. +2 more
The analysis of hard X-ray INTEGRAL observations (2003-2008) of superaccreting Galactic microquasar SS433 at precessional phases of the source with the maximum disc opening angle is carried out. It is found that the shape and width of the primary X-ray eclipse are strongly variable, suggesting additional absorption in dense stellar wind and gas ou…
Multipoint observations of ions in the 30-160 keV energy range upstream of the Earth's bow shock
Daly, P. W.; Klecker, B.; Lucek, E. A. +2 more
We use multipoint observation data by Cluster during time periods when the interspacecraft separation distance was between 1 and 1.5 Earth radii in order to study the physical processes related to diffuse ions at <200 keV/e. For our analysis we use data from the Research with Adaptive Particle Imaging Detectors (RAPID) experiment onboard Cluste…
A practical database method for predicting arrivals of ``average'' interplanetary shocks at Earth
Feng, X. S.; Zhang, Y.; Dryer, M. +3 more
A practical database method for predicting the interplanetary shock arrival time at L1 point is presented here. First, a shock transit time database (hereinafter called Database-I) based on HAFv.1 (version 1 of the Hakamada-Akasofu-Fry model) is preliminarily established with hypothetical solar events. Then, on the basis of the prediction test res…