Search Publications
Missions
Journals
Publication Years
On contamination and completeness in z >= 5 Lyman-break galaxy surveys
Lehnert, Matthew D.; Stanway, Elizabeth R.; Bremer, Malcolm N.
A large population of z > 5 Lyman-break galaxies has been identified in recent years. However, the high-redshift galaxies selected by different surveys are subject to a variety of selection effects - some overt, others more subtle. We present an analysis of sample completeness and contamination issues in high-redshift surveys, focusing on surve…
Optical identifications of five INTEGRAL hard X-ray sources in the Galactic plane
Bikmaev, I. F.; Sunyaev, R. A.; Sakhibullin, N. A. +4 more
The results of optical identifications of five hard X-ray sources in the Galactic plane from the INTEGRAL all-sky survey are presented. The X-ray data on one source (IGR J20216+4359) are published for the first time. The optical observations were performed with the 1.5-m RTT-150 telescope (Turkish National Observatory, Antalya, Turkey) and the 6-m…
Mechanics of Seismic Emission from Solar Flares
Lindsey, C.; Donea, A. -C.
Instances of seismic transients emitted into the solar interior in the impulsive phases of some solar flares offer a promising diagnostic tool, both for understanding the physics of solar flares and for the general development of local helioseismology. Among the prospective contributors to flare acoustic emission that have been considered are: i) …
Millisecond Microwave Spikes: Statistical Study and Application for Plasma Diagnostics
Rozhansky, I. V.; Fleishman, G. D.; Huang, G. -L.
We analyze a dense cluster of solar radio spikes registered at 4.5-6 GHz by the Purple Mountain Observatory spectrometer (Nanjing, China), operating in the 4.5-7.5 GHz range with 5 ms temporal resolution. To handle the data from the spectrometer, we developed a new technique that uses a nonlinear multi-Gaussian spectral fit based on χ2 …
The Effect of Magnetic Reconnection and Writhing in a Partial Filament Eruption
Liu, Rui; Alexander, David; Gilbert, Holly R. +1 more
We present observations from 2007 March 2 of a partial filament eruption characterized by two distinct phases of writhing motions: a quasi-static, slowly evolving phase followed by a rapid kinking phase showing a bifurcation of the filament. The quasi-static kinking motions are observed before there is any heating or flaring evident in EUV or soft…
Results from the ESA SREM monitors and comparison with existing radiation belt models
Nieminen, P.; Hajdas, W.; Bühler, P. +3 more
The Standard Radiation Environment Monitor (SREM) is a simple particle detector developed for wide application on ESA satellites. It measures high-energy protons and electrons of the space environment with a 20° angular resolution and limited spectral information. Of the ten SREMs that have been manufactured, four have so far flown. The first mode…
The early-type galaxies NGC 1407 and NGC 1400 - I. Spatially resolved radial kinematics and surface photometry
Forbes, Duncan A.; Proctor, Robert N.; Brough, Sarah +2 more
This is the first paper of a series focused on investigating the star formation and evolutionary history of the two early-type galaxies NGC 1407 and NGC 1400. They are the two brightest galaxies of the NGC 1407 (or Eridanus-A) group, one of the 60 groups studied as part of the Group Evolution Multi-wavelength Study.
Here, we present new high …A model for the temperature-dependence of tidal dissipation in convective plumes on icy satellites: Implications for Europa and Enceladus
Showman, Adam P.; Mitri, Giuseppe
To explain the formation of surface features on Europa, Enceladus, and other satellites, many authors have postulated the spatial localization of tidal heating within convective plumes. However, the concept that enhanced tidal heating can occur within a convective plume has not been rigorously tested. Most models of this phenomenon adopt a tidal h…
An intense state of hard X-ray emission of Cyg X-1 observed by INTEGRAL coincident with TeV measurements
Malzac, J.; Laurent, P.; Cadolle Bel, M. +3 more
Aims: We present INTEGRAL light curves and spectra of the black-hole binary Cyg X-1 during a bright event that occurred in 2006 September, and which was simultaneous with a detection at 0.15-1 TeV energies by the MAGIC telescope.
Methods: We analyse the hard X-ray emission from 18 to 700 keV with the INTEGRAL data taken on 2006 September 24-26…
An intriguing solar microflare observed with RHESSI, Hinode, and TRACE
Krucker, S.; Lin, R. P.; Hannah, I. G. +2 more
Aims:We investigate particle acceleration and heating in a solar microflare.
Methods: In a microflare with non-thermal emission to remarkably high energies (>50 keV), we investigate the hard X-rays with RHESSI imaging and spectroscopy and the resulting thermal emission seen in soft X-rays with Hinode/XRT and in EUV with TRACE.
Results: …