Search Publications
Equatorial winds on Saturn and the stratospheric oscillation
Fletcher, Leigh N.; West, Robert A.; Porco, Carolyn C. +13 more
The zonal jets on the giant planets have been thought to be stable in time. A decline in the velocity of Saturn's equatorial jet has been identified, on the basis of a comparison of cloud-tracking data across two decades, but the differences in cloud speeds have since been suggested to stem from changes in cloud altitude in combination with vertic…
Dual Origin of Aerosols in Titan's Detached Haze Layer
Rodriguez, S.; West, R. A.; Brahic, A. +3 more
We have analyzed scattered light profiles from the Cassini Imaging Science Subsystem, taken at the limb and at several large phase angles. We also used results from an occultation observed by Ultraviolet Imaging Spectrograph in the ultraviolet. We found that particles responsible for the scattering in the detached haze have an effective radius aro…
HD 144432: A young triple system
Carmona, A.; Henning, Th.; van Boekel, R. +3 more
We present new imaging and spectroscopic data of the young Herbig star HD 144432 A, which is a well-known binary star with a separation of 1.47″. High-resolution NIR imaging data obtained with NACO at the VLT reveal that HD 144432 B itself is a close binary pair with a separation of 0.1″. High-resolution optical spectra, acquired with FEROS at the…
Suzaku and XMM-Newton Observations of the Fornax Cluster: Temperature and Metallicity Distribution
Sato, Kosuke; Nakazawa, Kazuhiro; Ohashi, Takaya +7 more
Suzaku observed a central region and five offset regions within 0.2
XMM-Newton observations of the pre-polar HS0922+1333
Schwope, A. D.; Schwarz, R.; Vogel, J.
We report on XMM-Newton and accompanying phase-resolved optical observations of HS0922+1333, one out of nine pre-polars. It shows X-ray and UV variability correlated with the visibility of the main accretion spot. The spectral X-ray properties reveal a low temperature thermal plasma of ~1 keV with FX more than one order of magnitude bel…
The dynamics and environmental impact of 3C 452
Hardcastle, M. J.; Croston, J. H.; Shelton, D. L.
We present a detailed analysis of a new XMM-Newton observation of the Fanaroff-Riley type II (FR II) radio galaxy 3C 452 and its environment. We detect X-ray emission from the hot intragroup medium and measure its temperature as well as obtaining the surface brightness and pressure profiles. We provide evidence that 3C 452 is currently heating its…
A Light-curve Model of the Symbiotic Nova PU Vul (1979): A Very Quiet Explosion with Long-lasting Flat Peak
Cassatella, Angelo; Kato, Mariko; Hachisu, Izumi +1 more
We present a light-curve model of the symbiotic nova PU Vul (Nova Vulpeculae 1979) that shows a long-lasting flat peak with no spectral indication of wind mass loss before decline. Our quasi-evolution models consisting of a series of static solutions explain both the optical flat peak and ultraviolet (UV) light curve simultaneously. The white dwar…
Soft Time Lags in the X-Ray Emission of Mrk 1040
Dewangan, Gulab; Misra, Ranjeev; Tripathi, Shruti +1 more
Temporal analysis of X-ray binaries and active galactic nuclei (AGNs) have shown that hard X-rays react to variation of soft ones after a time delay. The opposite trend, or soft lag, has only been seen in a few rare quasi-periodic oscillations in X-ray binaries and recently for the AGN 1H 0707-495, on short timescales of ~103 s. Here, w…
Clustering Properties of Far-infrared Sources in Hi-GAL Science Demonstration Phase Fields
Testi, L.; Elia, D.; Schisano, E. +9 more
We use a minimum spanning tree (MST) algorithm to characterize the spatial distribution of Galactic far-IR sources and derive their clustering properties. We aim to reveal the spatial imprint of different types of star-forming processes, e.g., isolated spontaneous fragmentation of dense molecular clouds, or events of triggered star formation aroun…
Testing the fragmentation limit in the Upper Sco association
Hambly, N. C.; Christensen, L.; Lodieu, N. +4 more
We present the results of a deep (J∼ 21 at 5σ) infrared photometric survey of a 0.95-deg2 area in the central region of the Upper Sco association. The photometric observations consist of a deep Y+J-band image obtained with the Wide Field Camera on the United Kingdom Infra-Red Telescope (UKIRT) with part coverage in Z complemented by the…