Search Publications
The kinematics of coronal mass ejections using multiscale methods
Gallagher, P. T.; Young, C. A.; McAteer, R. T. J. +1 more
Aims: The diffuse morphology and transient nature of coronal mass ejections (CMEs) make them difficult to identify and track using traditional image processing techniques. We apply multiscale methods to enhance the visibility of the faint CME front. This enables an ellipse characterisation to objectively study the changing morphology and kinematic…
Energetic particles in Saturn's magnetosphere during the Cassini nominal mission (July 2004-July 2008)
Livi, S.; Krupp, N.; Woch, J. +13 more
In July 2004 the Cassini spacecraft began its orbital tour in the Saturnian system and performed 74 orbits during the nominal mission (July 2004-July 2008) providing data from nearly all local times at various distances and latitudes relative to the planet. The particles and field instruments onboard the spacecraft were essentially operating conti…
Observations of X-Ray Oscillations in ξ Boo: Evidence of a Fast-Kink Mode in the Stellar Loops
Srivastava, A. K.; Pandey, J. C.
We report the observations of X-ray oscillations during the flare in a cool active star ξ Boo for the first time. ξ Boo was observed by EPIC/MOS of the XMM-Newton satellite. The X-ray light curve is investigated with wavelet and periodogram analyses. Both analyses clearly show oscillations of the period of ~1019 s. We interpret these oscillations …
Density waves in Cassini UVIS stellar occultations. 1. The Cassini Division
Sremčević, M.; Colwell, J. E.; Cooney, J. H. +1 more
We analyze density waves in the Cassini Division of Saturn's rings revealed by multiple stellar occultations by Saturn's rings observed with the Cassini Ultraviolet Imaging Spectrograph. The dispersion and damping of density waves provide information on the local ring surface mass density and viscosity. Several waves in the Cassini Division are on…
On the Progenitor of the Type II-Plateau SN 2008cn in NGC 4603
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Foley, Ryan J. +7 more
A trend is emerging regarding the progenitor stars that give rise to the most common core-collapse supernovae (SNe), those of Type II-Plateau (II-P): they generally appear to be red supergiants with a limited range of initial masses, ~8-16 M sun. Here, we consider another example, SN 2008cn, in the nearly face-on spiral galaxy NGC 4603.…
Cassini evidence for rapid interchange transport at Saturn
André, N.; Persoon, A. M.; Coates, A. J. +10 more
During its tour Cassini has observed numerous plasma injection events in Saturn's inner magnetosphere. Here, we present a case study of one "young" plasma bubble observed when Cassini was in the equatorial plane. The bubble was observed in the equatorial plane at ∼7 Saturn radii from Saturn and had a maximum azimuthal extent of ∼0.25 Rs (Rs=Saturn…
CO line emission in the halo of a radio galaxy at z = 2.6
Omont, A.; Boulanger, F.; Walter, F. +6 more
We report the detection of luminous CO(3-2) line emission in the halo of the z = 2.6 radio galaxy (HzRG) TXS0828+193, which has no detected counterpart at optical to mid-infrared wavelengths implying a stellar mass <~ few ×109Msolar and relatively low star formation rates. With the IRAM Plateau de Bure Interferometer (PdBI…
Spectrophotometrically Identified Stars in the PEARS-N and PEARS-S Fields
Walsh, J. R.; Burgasser, A. J.; Bochanski, J. J. +9 more
Deep ACS slitless grism observations and identification of stellar sources are presented within the Great Observatories Origins Deep Survey North and South fields which were obtained in the Probing Evolution And Reionization Spectroscopically (PEARS) program. It is demonstrated that even low-resolution spectra can be a very powerful means of ident…
AGN/starburst connection in action: the half million second RGS spectrum of NGC 1365
Zezas, A.; Bianchi, S.; Guainazzi, M. +4 more
Context: High-resolution X-ray observations in the imaging and spectral domain have recently opened a new window on active galactic nuclei (AGN) feedback onto the circumnuclear gas. Spectral diagnostics, as well as the remarkable morphological coincidence between [O iii] and X-rays, point to AGN photoionisation as the dominant ionisation mechanism…
The mass profile of early-type galaxies in overdense environments: the case of the double source-plane gravitational lens SL2SJ02176-0513
Kneib, J. -P.; Sygnet, J. -F.; Treu, T. +8 more
Context: The Strong Lensing Legacy Survey (SL2S) provides a sample of the strong lensing events associated with massive distant galaxies, some of which lie in the outskirts of galaxy groups and clusters.
Aims: We investigate the internal structure of early-type galaxies in overdense environments, where tidal forces are expected to alter dark m…