Search Publications
Suzaku spectra of a Type-II supernova remnant, Kes 79
Takahashi, Tadayuki; Koyama, Katsuji; Lee, Shiu-Hang +1 more
This paper reports on results of a Suzaku observation of the supernova remnant (SNR) Kes 79 (G33.6+0.1). The X-ray spectrum is best fitted by a two-temperature model: a non-equilibrium ionization (NEI) plasma and a collisional ionization equilibrium (CIE) plasma. The NEI plasma is spatially confined within the inner radio shell with kT ∼ 0.8 keV, …
Reconstructing the magnetosphere from data using radial basis functions
Tsyganenko, Nikolai A.; Andreeva, Varvara A.
A new method is proposed to derive from data magnetospheric magnetic field configurations without any a priori assumptions on the geometry of electric currents. The approach utilizes large sets of archived satellite data and uses an advanced technique to represent the field as a sum of toroidal and poloidal parts, whose generating potentials Ψ
Reflection of Propagating Slow Magneto-acoustic Waves in Hot Coronal Loops: Multi-instrument Observations and Numerical Modeling
Van Doorsselaere, Tom; Pant, Vaibhav; Banerjee, Dipankar +3 more
Slow MHD waves are important tools for understanding coronal structures and dynamics. In this paper, we report a number of observations from the X-Ray Telescope (XRT) on board HINODE and Solar Dynamic Observatory/Atmospheric Imaging Assembly (AIA) of reflecting longitudinal waves in hot coronal loops. To our knowledge, this is the first report of …
Can giant radio halos probe the merging rate of galaxy clusters?
Brunetti, G.; Cassano, R.; Ettori, S. +1 more
Observations of galaxy clusters both in the radio and X-ray bands probe a direct link between cluster mergers and giant radio halos, suggesting that these sources can be used as probes of the cluster merging rate with cosmic time. While all giant radio halos are found in merging clusters, not every merging cluster hosts a giant radio halo. In this…
Model-Observation Comparisons of Electron Number Densities in the Coma of 67P/Churyumov-Gerasimenko during January 2015
Altwegg, K.; Henri, P.; Edberg, N. J. T. +7 more
During 2015 January 9-11, at a heliocentric distance of ∼2.58-2.57 au, the ESA Rosetta spacecraft resided at a cometocentric distance of ∼28 km from the nucleus of comet 67P/Churyumov-Gerasimenko, sweeping the terminator at northern latitudes of 43°N-58°N. Measurements by the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis/Comet Pressure…
Study of the reflection spectrum of the LMXB 4U 1702-429
Sanna, A.; Papitto, A.; Di Salvo, T. +7 more
Context. The source
Deuterated polycyclic aromatic hydrocarbons: Revisited
Tielens, A. G. G. M.; Mori, T.; Onaka, T. +2 more
Aims: The amount of deuterium locked up in polycyclic aromatic hydrocarbons (PAHs) has to date been an uncertain value. We present a near-infrared (NIR) spectroscopic survey of Hii regions in the Milky Way, Large Magellanic Cloud, and Small Magellanic Cloud obtained with AKARI, which aims to search for features indicative of deuterated PAHs (…
VLT/ISAAC infrared spectroscopy of embedded high-mass YSOs in the Large Magellanic Cloud: Methanol and the 3.47 µm band
Boulanger, F.; Onaka, T.; Dartois, E. +1 more
Aims: This study aims to elucidate a possible link between chemical properties of ices in star-forming regions and environmental characteristics (particularly metallicity) of the host galaxy. The Large Magellanic Cloud (LMC) is an excellent target to study properties of interstellar and circumstellar medium in a different galactic environment…
Silicate Composition of the Interstellar Medium
Watson, D. M.; Sargent, B. A.; Fogerty, S. +2 more
The composition of silicate dust in the diffuse interstellar medium and in protoplanetary disks around young stars informs our understanding of the processing and evolution of the dust grains leading up to planet formation. An analysis of the well-known 9.7 µm feature indicates that small amorphous silicate grains represent a significant fra…
Optical and near-infrared observations of SN 2014ck: an outlier among the Type Iax supernovae
Howell, D. A.; Kankare, E.; Turatto, M. +18 more
We present a comprehensive set of optical and near-infrared (NIR) photometric and spectroscopic observations for SN 2014ck, extending from pre-maximum to six months later. These data indicate that SN 2014ck is photometrically nearly identical to SN 2002cx, which is the prototype of the class of peculiar transients named SNe Iax. Similar to SN 2002…