Search Publications
Missions
Journals
Publication Years
Transition of an X-ray binary to the hard ultraluminous state in the blue compact dwarf galaxy VII Zw 403
Kaaret, P.; Feng, H.; Brorby, M.
We examine the X-ray spectra of VII Zw 403, a nearby low-metallicity blue compact dwarf (BCD) galaxy. The galaxy has been observed to contain an X-ray source, likely a high-mass X-ray binary (HMXB), with a luminosity of 1.3-23 × 1038 erg s-1 in the 0.3-8 keV energy range. A new Suzaku observation shows a transition to a lumin…
A Coordinated X-Ray and Optical Campaign of the Nearest Massive Eclipsing Binary, δ Orionis Aa. I. Overview of the X-Ray Spectrum
Gull, T. R.; Corcoran, M. F.; Owocki, S. P. +22 more
We present an overview of four deep phase-constrained Chandra HETGS X-ray observations of δ Ori A. Delta Ori A is actually a triple system that includes the nearest massive eclipsing spectroscopic binary, δ Ori Aa, the only such object that can be observed with little phase-smearing with the Chandra gratings. Since the fainter star, δ Ori Aa2, has…
Nearly scale-invariant power spectrum and quantum cosmological perturbations in the gravity's rainbow scenario
Wang, Sai; Chang, Zhe
We propose the gravity's rainbow scenario as a possible alternative of the inflation paradigm to account for the flatness and horizon problems. We focus on studying the cosmological scalar perturbations which are seeded by the quantum fluctuations in the very early universe. The scalar power spectrum is expected to be nearly scale-invariant. We es…
Amazonian modification of Moreux crater: Record of recent and episodic glaciation in the Protonilus Mensae region of Mars
Sinha, Rishitosh K.; Murty, S. V. S.
Morphologic characteristics of ice-rich landforms in the martian mid-latitudes record evidence for significant modification of the landscape in response to spin-axis/orbital parameter-driven shifts in the Late Amazonian climate. These landforms are spatially distributed across the mid-latitudes and their co-existing presence has so far not been ob…
Corrigendum to "The Sunlit lunar atmosphere: A Comprehensive study by CHACE on the Moon Impact Probe of Chandrayaan-1" [Planet. Space Sci. 58 (2010) 1567-1577]
Sridharan, R.; Ahmed, S. M.; Sreelatha, P. +4 more
The authors regret, an inadvertent error that could creep in while one attempts to estimate the number densities based on the reported lunar atmospheric composition data from the CHACE measurements in CHANDRAYAAN-1, the first Indian mission to the moon has been identified.
Testing the magnetotail configuration based on observations of low-altitude isotropic boundaries during quiet times
Toth, G.; Ilie, R.; Ganushkina, N. +2 more
We investigate the configuration of the geomagnetic field on the nightside magnetosphere during a quiet time interval based on National Oceanic and Atmospheric Administration Polar Orbiting Environment Satellites Medium Energy Proton and Electron Detector (NOAA/POES MEPED) measurements in combination with numerical simulations of the global terres…
VIMOS mosaic integral-field spectroscopy of the bulge and disc of the early-type galaxy NGC 4697
Covone, G.; Capaccioli, M.; Napolitano, N. R. +5 more
We present an integral-field study of the internal structure, kinematics and stellar population of the almost edge-on, intermediate-luminosity (L★) elliptical galaxy NGC 4697. We build extended two-dimensional (2D) maps of the stellar kinematics and line strengths of the galaxy up to ∼0.7 effective radii (Reff) using a mosaic…
Field-aligned chorus wave spectral power in Earth's outer radiation belt
Daly, P. W.; Haaland, S. E.; Kronberg, E. A. +8 more
Chorus-type whistler waves are one of the most intense electromagnetic waves generated naturally in the magnetosphere. These waves have a substantial impact on the radiation belt dynamics as they are thought to contribute to electron acceleration and losses into the ionosphere through resonant wave-particle interaction. Our study is devoted to the…
Discovery of a second outbursting hyperluminous X-ray source
Torres, M. A. P.; Heida, M.; Jonker, P. G.
We report on six Chandra and one HST/WFC3 observation of CXO J122518.6+144545, discovered by Jonker et al. (2010) as a candidate hyperluminous X-ray source (HLX), X-ray bright supernova or recoiling supermassive black hole at LX = 2.2 × 1041 erg s-1 (if associated with the galaxy at 182 Mpc). We detect a new outbur…
Rotation period distribution of CoRoT and Kepler Sun-like stars
Pasquini, L.; Baglin, A.; Janot-Pacheco, E. +9 more
Aims: We study the distribution of the photometric rotation period (Prot), which is a direct measurement of the surface rotation at active latitudes, for three subsamples of Sun-like stars: one from CoRoT data and two from Kepler data. For this purpose, we identify the main populations of these samples and interpret their main bias…