Search Publications
Missions
Journals
Publication Years
Disc precession in the M31 dipping X-ray binary Bo 158?
Kolb, U.; Osborne, J. P.; Barnard, R. +3 more
We present results from three XMM-Newton observations of the M31 low mass X-ray binary (LMXB) XMMU J004314.4+410726.3 (Bo 158), spaced over 3d in 2004 July. Bo 158 was the first dipping LMXB to be discovered in M31. Periodic intensity dips were previously seen to occur on a 2.78-h period, due to absorption in material that is raised out of the pla…
Cluster encounter with an energetic electron beam during a substorm
Escoubet, C. P.; Thomsen, M. F.; Davies, J. A. +16 more
During a passage of the midtail plasma sheet, the Cluster 3 spacecraft made an unprecedented high-resolution measurement of a beam of electrons with energies up to 400 keV. The beam was only fully resolved by combining the energy range coverage of the Plasma Electron and Current Experiment and Research with Adaptive Particle Imaging Detector elect…
Investigation of the cosmic ray ground level enhancements during solar cycle 23
Wang, Jingxiu; Wang, Ruiguang
Major solar energetic particle events associated with large solar flares can give rise to cosmic ray ground level enhancements (GLEs). Up to December 2003 during solar activity cycle 23, 13 GLEs (Number from 55 to 67) have been recorded by the worldwide network of neutron monitors. Nine of the 13 GLEs (69%) originated from the southern hemisphere …
Nobeyama radio heliograph observations of RHESSI microflares
Kundu, M. R.; Shibasaki, K.; Garaimov, V. I. +2 more
Aims.We present a summary of the analysis of thirty microflares, observed simultaneously by the Ramaty High Energy Solar Spectroscopic Imager (RHESSI) in hard X-rays and by Nobeyama RadioHeliograph (NoRH) in microwaves (17 GHz).
Methods: .We used microflares observed by RHESSI in the energy range 3-25 keV, and for larger events, up to 35 keV.…
The anatomy of a quadruply imaged gravitational lens system
Blandford, R. D.; Suyu, S. H.
The key to using a strong gravitational lens system to measure the Hubble constant is to obtain an accurate model of the lens potential. In this paper, we investigate the properties of gravitational lens B1608+656, a quadruply imaged lens system with an extended source intensity distribution. Our analysis is valid for generic quadruply lensed syst…
Three-Dimensional Magnetohydrodynamic Simulation of a Global Solar Corona Using a Temperature Distribution Map Obtained from SOHO EIT Measurements
Liu, Yang; Hayashi, Keiji; Hoeksema, Todd +2 more
The temperature at the base of the solar corona is one of the important factors in determining the solar coronal structure. In this Letter, we performed the time-dependent magnetohydrodynamic (MHD) simulation for the solar corona utilizing the temperature map derived from the multiwavelength observation by the EUV Imaging Telescope (EIT) on the So…
The Fundamental Plane in RX J0142.0+2131: A Galaxy Cluster Merger at z=0.28
Jørgensen, Inger; Chiboucas, Kristin; Barr, Jordi +2 more
We present the fundamental plane (FP) in the z=0.28 cluster of galaxies RX J0142.0+2131. There is no evidence for a difference in the slope of the FP when compared with the Coma Cluster, although the internal scatter is larger. On average, stellar populations in RX J0142.0+2131 have rest-frame V-band mass-to-light ratios (M/LV) 0.29+/-0…
Extended X-Ray Emission from QSOs
Fu, Hai; Stockton, Alan; Canalizo, Gabriela +1 more
We report Chandra ACIS observations of the fields of four QSOs showing strong extended optical emission-line regions. Two of these show no evidence for significant extended X-ray emission. The remaining two fields, those of 3C 249.1 and 4C 37.43, show discrete (but resolved) X-ray sources at distances ranging from ~10 to ~40 kpc from the nucleus. …
Silicate Emission Profiles from Low-Mass Protostellar Disks in the Orion Nebula: Evidence for Growth and Thermal Processing of Grains
Smith, Nathan; Bally, John; Kassis, Marc +2 more
We present 8-13 µm low-resolution spectra (R~100) of eight low-mass protostellar objects (``proplyds'') in the Orion Nebula using the Long Wavelength Spectrometer at the W. M. Keck Observatory. All but one of the sources in our sample show strong circumstellar silicate emission, with profiles that are qualitatively similar to those seen in s…
GCM simulation of balloon trajectories on Titan
Lorenz, Ralph D.; Tokano, Tetsuya
Possible trajectories of passive balloons in Titan's troposphere are simulated with the instantaneous wind field predicted by a GCM (general circulation model). In most areas the basic motion of a balloon is a predominantly eastward or westward drift, depending on altitude, latitude and season of the balloon release point. Some meridional oscillat…