Search Publications
Stratospheric global winds on Titan at the time of Huygens descent
Sonnabend, G.; Kostiuk, T.; Witasse, O. +9 more
Measurements of stratospheric zonal winds on Titan were made in preparation for and during the time of the descent of the Huygens Probe into Titan's atmosphere on 14 January 2005. Fully resolved emission lines from ethane near 11.7 µm were measured on the east, center, and west positions on Titan using the NASA/GSFC Heterodyne Instrument for…
Morphology and Evolution of Emission-Line Galaxies in the Hubble Ultra Deep Field
Panagia, N.; Ferguson, H. C.; Koekemoer, A. M. +8 more
We investigate the properties and evolution of a sample of galaxies selected to have prominent emission lines in low-resolution grism spectra of the Hubble Ultra Deep Field (HUDF). These objects, eGRAPES, are late-type blue galaxies characterized by small proper sizes (R50<=2 kpc) in the 4350 Å rest frame, low masses (5×109
Predictions and Strategies for Integral-Field Spectroscopy of High-Redshift Galaxies
Erb, Dawn K.; Steidel, Charles C.; Law, David R.
We investigate the ability of infrared integral-field spectrographs to map the velocity fields of high-redshift galaxies, presenting a formalism that can be applied to any telescope and imaging spectrograph system. We discuss the 5 σ limiting line fluxes that current integral-field spectrographs reach and extend this discussion to consider future …
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…