Search Publications
Properties of Newly Formed Dust by SN 2006JC Based on Near- to Mid-Infrared Observation With AKARI
Tanaka, M.; Ohyama, Y.; Matsuhara, H. +18 more
We present our latest results on near- to mid-infrared (MIR) observation of supernova (SN) 2006jc at 200 days after the discovery using the Infrared Camera (IRC) on board AKARI. The near-infrared (2-5 µm) spectrum of SN 2006jc is obtained for the first time and is found to be well interpreted in terms of the thermal emission from amorphous c…
The secondary eclipse of CoRoT-1b
Mazeh, T.; Aigrain, S.; Alapini, A. +33 more
The transiting planet CoRoT-1b is thought to belong to the pM-class of planets, in which the thermal emission dominates in the optical wavelengths. We present a detection of its secondary eclipse in the CoRoT white channel data, whose response function goes from ~400 to ~1000 nm. We used two different filtering approaches, and several methods to e…
X-ray emission from the extended discs of spiral galaxies
Warwick, R. S.; Owen, R. A.
We present a study of the X-ray properties of a sample of six nearby late-type spiral galaxies based on XMM-Newton observations. Since our primary focus is on the linkage between X-ray emission and star formation in extended, extranuclear Galactic discs, we have selected galaxies with near face-on aspect and sufficient angular extent so as to be r…
X-ray observations of PSR B1259-63 near the 2007 periastron passage
Takahashi, T.; Uchiyama, Y.; Aharonian, F. +2 more
PSR B1259-63 is a 48-ms radio pulsar in a highly eccentric 3.4-yr orbit with a Be star SS 2883. Unpulsed γ-ray, X-ray and radio emission components are observed from the binary system. It is likely that the collision of the pulsar wind with the anisotropic wind of the Be star plays a crucial role in the generation of the observed non-thermal emiss…
A Self-Consistent Nonlinear Force-Free Solution for a Solar Active Region Magnetic Field
Régnier, S.; Wheatland, M. S.
Nonlinear force-free solutions for the magnetic field in the solar corona constructed using photospheric vector magnetic field boundary data suffer from a basic problem: the observed boundary data are inconsistent with the nonlinear force-free model. Specifically, there are two possible choices of boundary conditions on vertical current provided b…
High energy neutron and pion-decay gamma-ray emissions from solar flares
Chupp, Edward L.; Ryan, James M.
Solar flare gamma-ray emissions from energetic ions and electrons have been detected and measured to GeV energies since 1980. In addition, neutrons produced in solar flares with 100 MeV to GeV energies have been observed at the Earth. These emissions are produced by the highest energy ions and electrons accelerated at the Sun and they provide our …
Spectral and intensity variations of Galactic 26Al emission
Wang, W.; Strong, A. W.; Knödlseder, J. +9 more
Aims: Gamma-ray line emission from the radioactive decay of 26Al reflects nucleosynthesis in massive stars and supernovae. We use INTEGRAL 26Al measurements to characterize the distribution and characteristics of 26Al source regions throughout the Galaxy.
Methods: The spectrometer SPI aboard INTEGRAL has accumu…
Spitzer View of Young Massive Stars in the Large Magellanic Cloud H II Complex N 44
Gordon, Karl D.; Chu, You-Hua; Gruendl, Robert A. +2 more
The H II complex N 44 in the Large Magellanic Cloud (LMC) provides an excellent site to perform a detailed study of star formation in a mild starburst, as it hosts three regions of star formation at different evolutionary stages, and it is not as complicated and confusing as the 30 Doradus giant H II region. We have obtained Spitzer Space Telescop…
Searching for modifications to the exponential radioactive decay law with the Cassini spacecraft
Cooper, Peter S.
Data from the power output of the radioisotope thermoelectric generators aboard the Cassini spacecraft are used to test the conjecture that small deviations observed in terrestrial measurements of the exponential radioactive decay law are correlated with the Earth-Sun distance. No significant deviations from exponential decay are observed over a r…
On the numerical modelling of VLF chorus dynamical spectra
Santolik, O.; Nunn, D.; Rycroft, M. +1 more
This paper presents a study of the use of a one-dimensional Vlasov Hybrid Simulation (VHS) computer code to simulate the dynamical spectra (i.e. frequency versus time spectrograms) of ELF/VLF chorus signals (from ~a fraction to ~10 kHz). Recently excellent measurements of chorus have been made in the source region close to the geomagnetic equator …