Search Publications
Secondary Photons from High-Energy Protons Accelerated in Hypernovae
Asano, Katsuaki; Mészáros, Peter
Recent observations show that hypernovae may deposit some fraction of their kinetic energy in mildly relativistic ejecta. In the dissipation process of such ejecta in a stellar wind, cosmic-ray protons can be accelerated up to ~1019 eV. We discuss the TeV to MeV gamma-ray and the X-ray photon signatures of cosmic rays accelerated in hyp…
Comment on “Comparison of the composition of the Tempel 1 ejecta to the dust in Comet C/Hale Bopp 1995 O1 and YSO HD 100546” by C.M. Lisse, K.E. Kraemer, J.A. Nuth III, A. Li, D. Joswiak [2007. Icarus 187, 69 86]
Bockelée-Morvan, Dominique; Crovisier, Jacques
Lisse et al. [Lisse, C.M., Kraemer, K.E., Nuth III, J.A., Li, A., Joswiak, D., 2007. Icarus 187, 69-86] recently presented a new analysis of an ISO spectrum of Comet C/1995 O1 (Hale-Bopp), from which they claimed the identification of many new dust species. Among them are PAHs, which were not found in our first analysis of the ISO spectra. We pres…
High-Energy Properties of PKS 1830-211
Torres, Diego F.; Zhang, Shu; Wang, Jian-Min +4 more
We report an analysis of X-ray and γ-ray observations of PKS 1830-211, based on long-term campaigns carried out by INTEGRAL and COMPTEL. The INTEGRAL data currently available provide a 33 σ significance detection in the 20-100 keV band, while the COMPTEL 6 yr data provide a 5.2 σ significance detection in the 1-3 MeV energy band. In hard X-rays, I…
The X-ray spectrum of RX J1914.4+2456 revisited
Ramsay, Gavin
It has been proposed that RX J1914.4+2456 is a stellar binary system with an orbital period of 9.5 min. As such it shares many similar properties with RX J0806.3+1527 (5.4 min). However, while the X-ray spectrum of RX J0806.3+1527 can be modelled using a simple absorbed blackbody, the X-ray spectrum of RX J1914.4+2456 has proved difficult to fit u…
The XMM-Newton X-Ray Emission of the Supernova Remnant N 120 in the Large Magellanic Cloud
Rosado, Margarita; Reyes-Iturbide, Jorge; Velázquez, Pablo F.
We present new XMM-Newton observations of the supernova remnant (SNR) N 120 in the Large Magellanic Cloud, and numerical simulations on the evolution of this SNR which we compare with the X-ray observations. The SNR N 120, together with several H II regions, forms a large nebular complex (also called N 120) whose shape resembles a semicircular rin…
Line Intensity Ratios in the EIS Range Sensitive to Electron Densities in 107 K Plasmas
Landi, E.; Doschek, G. A.; Feldman, U.
Electron density variations during the rise, maximum, and decay phases of flaring plasmas at T simeq 10 MK are important quantities to be used to test flare models. To date, electron density values measured in solar flares are, with few exceptions, only lower limits. With the launch of the EUV Imaging Spectrometer (EIS) on Hinode, it has become po…
A review of penetrometers for subsurface access on comets and asteroids
Ball, Andrew J.; Glaser, David L.; Zacny, Kris A.
The characterization of comet and asteroid interiors will eventually require in situ exploration with drills, penetrators/penetrometers, hypervelocity impactors, excavators or other devices. Because they offer desirable scientific capabilities and relative mechanical simplicity, penetrators and penetrometers, which use only axial force to push ben…
Optical Selection of Faint Active Galactic Nuclei in the COSMOS Field
Brusa, M.; Capak, P.; Schinnerer, E. +6 more
We outline a strategy to select faint (iAB < 24.5) type 1 active galactic nucleus (AGN) candidates down to the Seyfert/QSO boundary for spectroscopic targeting in the COSMOS field. Our selection process picks candidates by their nonstellar colors in uBVRizK broadband photometry from the Subaru and CFH Telescopes and morphological pro…
Color, 3D simulated images with shapelets
Mobasher, Bahram; Massey, Richard; Rhodes, Jason +3 more
We present a method to simulate color, 3-dimensional images taken with a space-based observatory by building off of the established shapelets pipeline. The simulated galaxies exhibit complex morphologies, which are realistically correlated between, and include, known redshifts. The simulations are created using galaxies from the 4 optical and near…
Detection of a hot intergalactic medium in the spiral-only compact group SCG0018-4854
Reeves, J.; Trinchieri, G.; Iovino, A. +4 more
Aims: Compact groups of galaxies are excellent laboratories for studying galaxy interactions and their effects on the evolution of galaxies. In particular, dynamically young systems, with a large fraction of interacting, late type galaxies, have so far escaped proper studies in the X-ray band and their hot intergalactic medium properties are virtu…