Search Publications
Improving PSF modelling for weak gravitational lensing using new methods in model selection
Rowe, Barnaby
A simple theoretical framework for the description and interpretation of spatially correlated modelling residuals is presented, and the resulting tools are found to provide a useful aid to model selection in the context of weak gravitational lensing. The description is focused upon the specific problem of modelling the spatial variation of a teles…
Dione's spectral and geological properties
Baines, Kevin H.; Buratti, Bonnie J.; Clark, Roger N. +12 more
We present a detailed analysis of the variations in spectral properties across the surface of Saturn's satellite Dione using Cassini/VIMS data and their relationships to geological and/or morphological characteristics as seen in the Cassini/ISS images. This analysis focuses on a local region on Dione's anti-saturnian hemisphere that was observed b…
On the Morphology of the Electron-Positron Annihilation Emission as Seen by Spi/integral
Bouchet, L.; Jourdain, E.; Roques, J. P.
The 511 keV positron annihilation emission remains a mysterious component of the high energy emission of our Galaxy. Its study was one of the key scientific objectives of the SPI spectrometer on board the International Gamma-Ray Astrophysics Laboratory satellite. In fact, a lot of observing time has been dedicated to the Galactic disk with a parti…
Star formation and dust extinction properties of local galaxies from the AKARI-GALEX all-sky surveys . First results from the most secure multiband sample from the far-ultraviolet to the far-infrared
Buat, V.; Burgarella, D.; Takeuchi, T. T. +5 more
Aims: We explore spectral energy distributions (SEDs), star formation (SF), and dust extinction properties of galaxies in the Local Universe.
Methods: The AKARI all-sky survey provided the first bright point source catalog detected at 90 µm. Beginning with this catalog, we selected galaxies by matching the AKARI sources with those …
Free Magnetic Energy and Flare Productivity of Active Regions
Xu, Yan; Jing, Ju; Wang, Haimin +4 more
In this study, the photospheric vector magnetograms, obtained with the Spectro-Polarimeter of the Solar Optical Telescope on board Hinode, are used as the boundary conditions to extrapolate the three-dimensional nonlinear force-free (NLFF) coronal magnetic fields. The observed non-force-free photospheric magnetic fields are preprocessed toward the…
Titan's highly dynamic magnetic environment: A systematic survey of Cassini magnetometer observations from flybys TA-T62
Dougherty, Michele K.; Saur, Joachim; Kriegel, Hendrik +5 more
We analyze the variability of the ambient magnetic field near Titan during Cassini encounters TA-T62 (October 2004-October 2009). Cassini magnetometer (MAG) data show that the moon's magnetic environment is strongly affected by its proximity to Saturn's warped and highly dynamic magnetodisk. In the nightside sector of Saturn's magnetosphere, the m…
The Nova Shell and Evolution of the Recurrent Nova T Pyxidis
Schaefer, Bradley E.; Shara, Michael M.; Pagnotta, Ashley
T Pyxidis (T Pyx) is the prototypical recurrent nova (RN), with five eruptions from 1890 to 1967 and a mysterious nova shell. We report new observations of the nova shell with the Hubble Space Telescope (HST) in the year 2007, which provides a long time baseline to compare with HST images from 1994 and 1995. We find that the knots in the nova shel…
A Multi-wavelength View of the Star Formation Activity at z ~ 3
Daddi, E.; Elbaz, D.; Dickinson, M. +5 more
We present a multi-wavelength, UV-to-radio analysis for a sample of massive (M * ~ 1010 M sun) IRAC- and MIPS 24 µm detected Lyman break galaxies (LBGs) with spectroscopic redshifts z ~ 3 in the GOODS-North field. For LBGs without individual 24 µm detections, we employ stacking techniques at 24 µm…
Energetic neutral atoms from the Earth's subsolar magnetopause
Wurz, P.; Reisenfeld, D. B.; McComas, D. J. +10 more
The shocked solar wind in the Earth's magnetosheath becomes nearly stationary at the subsolar magnetopause. At this location, solar wind protons are neutralized by charge exchange with neutral hydrogen atoms at the extreme limits of the Earth's tenuous exosphere. The resulting Energetic Neutral Atoms (ENAs) propagate away from the subsolar region …
Well-sampled Far-infrared Spectral Energy Distributions of z ~ 2 Galaxies: Evidence for Scaled up Cool Galaxies
Franx, Marijn; Muzzin, Adam; Labbé, Ivo +4 more
We present an analysis of the far-infrared (FIR) spectral energy distributions (SEDs) of two massive K-selected galaxies at z= 2.122 and z= 2.024 detected at 24 µm, 70 µm, 160 µm by Spitzer, 250 µm, 350 µm, 500 µm by BLAST, and 870 µm by APEX. The large wavelength range of these observations and the availa…