Search Publications
Energetic electron microsignatures as tracers of radial flows and dynamics in Saturn's innermost magnetosphere
Coates, A. J.; Krupp, N.; Roussos, E. +6 more
Signatures of energetic electron depletions from Saturn's inner moons (microsignatures) have been mainly utilized to infer properties of magnetospheric diffusion. The same data, however, indicate that microsignatures can be a much more powerful tool for magnetospheric studies. Here we introduce a new method where the energy structure of a microsig…
Identification of cryovolcanism on Titan using fuzzy cognitive maps
Lunine, Jonathan I.; Kargel, Jeffrey S.; Furfaro, Roberto +2 more
Future planetary exploration of Titan will require higher degrees of on-board automation, including autonomous determination of sites where the probability of significant scientific findings is the highest. In this paper, a novel Artificial Intelligence (AI) method for the identification and interpretation of sites that yield the highest potential…
A spherical Monte-Carlo model of aerosols: Validation and first applications to Mars and Titan
Langevin, Yves; Vincendon, Mathieu
The atmospheres of Mars and Titan are loaded with aerosols that impact remote sensing observations of their surface. Here we present the algorithm and the first applications of a radiative transfer model in spherical geometry designed for planetary data analysis. We first describe a fast Monte-Carlo code that takes advantage of symmetries and geom…
The Role of Magnetic Topology in the Heating of Active Region Coronal Loops
Reeves, Katharine K.; Golub, L.; Leka, K. D. +4 more
We investigate the evolution of coronal loop emission in the context of the coronal magnetic field topology. New modeling techniques allow us to investigate the magnetic field structure and energy release in active regions (ARs). Using these models and high-resolution multi-wavelength coronal observations from the Transition Region and Coronal Exp…
Cosmic-ray Spallation in Radio-quiet Active Galactic Nuclei: A Case Study of NGC 4051
Turner, T. J.; Miller, L.
We investigate conditions for and consequences of spallation in radio-quiet Seyfert galaxies. The work is motivated by the recent discovery of significant line emission at 5.44 keV in Suzaku data from NGC 4051. The energy of the new line suggests an identification as Cr I Kα emission; however, the line is much stronger than would be expected from …
On the Component Masses of Visual Binaries
Cvetkovic, Z.; Ninkovic, S.
In the Sixth Catalog of Orbits of Visual Binary Stars we found those belonging to the Main Sequence to form a sample containing 432 visual binaries. Their total masses were obtained dynamically, i.e. they were calculated using the orbital elements and the new Hipparcos parallaxes. For the same pairs the total mass was also found astrophysically - …
Environmental dependence of 8 µm luminosity functions of galaxies at z ~ 0.8. Comparison between RXJ1716.4+6708 and the AKARI NEP-deep field
Im, M.; Lee, H. M.; Inami, H. +20 more
Aims: We aim to reveal environmental dependence of infrared luminosity functions (IR LFs) of galaxies at z ~ 0.8 using the AKARI satellite. AKARI's wide field of view and unique mid-IR filters help us to construct restframe 8 µm LFs directly without relying on SED models.
Methods: We construct restframe 8 µm IR LFs in the clu…
The association between gas and galaxies - III. The cross-correlation of galaxies and Lyα absorbers† at z ~ 1
Morris, Simon L.; Shone, Allen M.; Crighton, Neil +1 more
We have measured the two-dimensional two-point correlation function, ξAG, between low-column-density Lyα absorbers and galaxies at a redshift z ~ 1. We measured Lyα absorbers between redshifts z = 0.68 and 1.51 over a total redshift path length of Δz = 1.08 from Hubble Space Telescope Space Telescope Imaging Spectrograph E230M absorptio…
High-resolution visible spectroscopy of the jet-driving star Th 28
Comerón, F.; Fernández, M.
Context. We present a study of the extreme T Tauri star Th 28, a young stellar object in the Lupus 3 cloud whose spectrum displays all the varieties of signposts associated with early stellar activity. Th 28 is the driving source of a fast jet, making it a very promising target to study the disk-jet connection.
Aims: We try to identify and in…
Fine Magnetic Features and Chirality in Solar Active Region NOAA 10930
Zhang, Hongqi
In this paper, we present fine magnetic features near the magnetic inversion line in the solar active region NOAA 10930. The high-resolution vector magnetograms obtained by Hinode allow detailed analyses around magnetic fibrils in the active region. The analyses are based on the fact that the electric current density can be divided into two compon…