Search Publications
Missions
Journals
Publication Years
Deviations from passive evolution - star formation and the ultraviolet excess in z~ 1 radio galaxies
Inskip, K. J.; Best, P. N.; Longair, M. S.
Galaxy colours are determined for two samples of 6C and 3CR radio sources at z~ 1, differing by a factor of ~6 in radio power. Corrections are made for emission-line contamination and the presence of any nuclear point source, and the data analysed as a function of both redshift and the radio source properties. The galaxy colours are remarkably sim…
Morphological classification of nearby galaxies based on asymmetry and luminosity concentration
Doi, M.; Shimasaku, K.; Okamura, S. +2 more
We investigate the behaviour of the asymmetry parameter A as a morphological parameter using a `volume-limited' sample of 349 galaxies (distance <=25Mpc,MV<=-18.5mag) and a larger magnitude-limited sample of 707 nearby galaxies. We confirm the correlation of A with morphological type. The late-type galaxies (Sdm, Sm and Im) have l…
High Resolution and Broad Band Spectra of Low Mass X-ray Binaries: a Comparison between Black Holes and Neutron Stars
Iaria, Rosario; Di Salvo, Tiziana; Burderi, Luciano +1 more
A common question about compact objects in high energy astrophysics is whether it is possible to distinguish black hole from neutron star systems with some other property that is not the mass of the compact object. Up to now a few characteristics have been found which are typical of neutron stars (like quasi periodic oscillations at kHz frequencie…
Cluster observations of a structured magnetospheric cusp
Balogh, A.; Fazakerley, A. N.; André, M. +8 more
On 18 April 2002 the Cluster spacecraft crossed through the northern outer magnetospheric cusp region during 16:25-17:55 UT when the solar wind dynamic pressure was rather low (<2 nPa) and IMF Bz was more negative than IMF By. The Cluster data from the FGM, CIS, PEACE, EFW, WHISPER and STAFF instruments reveal that the cus…
Double-Probe Measurements in Cold Tenuous Space Plasma Flows
Eriksson, A. I.; Engwall, E.
Anglo-Australian Telescope Imaging and Microslit Spectroscopy in the Southern Hubble Deep Field
Glazebrook, Karl; Mann, Robert G.; Verma, Aprajita +3 more
We present a deep photometric (B- and R-band) catalog and an associated spectroscopic redshift survey conducted in the vicinity of the Hubble Deep Field-South. The spectroscopy yields 53 extragalactic redshifts in the range 0<z<1.4, substantially increasing the body of spectroscopic work in this field to over 200 objects. The targets are sel…
A multi-wavelength study of the IRAS Deep Survey galaxy sample. I. Optical observations. The redshift distribution
Aussel, H.; de Zotti, G.; Mazzei, P. +2 more
Context: The IRAS Deep Survey (IDS) of the North Ecliptic Pole region remains one of the deepest complete far-infrared-selected galaxy samples available. ISOCAM observations in the LW3 filter (12-18 µm) of 3.2 arcmin × 3.2 arcmin fields centered on the nominal positions of 94 out of the 98 IDS sources yielding 116 ISOCAM detections. The resu…
The Double Structure of the Coronal Streamer Belt
Eselevich, M. V.; Eselevich, V. G.
Increasing the effective spatial resolution when analyzing LASCO-C2/SOHO data helped to reveal the existence of double-ray structure in the streamer belt, both in the absence and presence of belt bends. Streamer-belt rays located in the plane of the sky are demonstrated to deviate poleward (north- and southward, respectively, in the N and S hemisp…
Cross-Scale Coupling Within Rolled-Up MHD-Scale Vortices and Its Effect on Large Scale Plasma Mixing Across the Magnetospheric Boundary
Hasegawa, H.; Fujimoto, M.; Nakamura, T. K. M.
Kelvin-Helmholtz Instability (KHI) is an MHD-scale instability that grows in a velocity shear layer such as the low-latitude boundary layer of the magnetosphere. KHI is driven unstable when a velocity shear is strong enough to overcome the stabilization effect of magnetic field. When the shear is significantly strong, vortices in the nonlinear sta…
MERLIN Astrometry of 11 Radio Stars
Garrington, Simon T.; Fey, Alan L.; Boboltz, David A. +3 more
We report accurate positions in the International Celestial Reference Frame (ICRF) for 11 radio stars. Observations were made using the Multi-Element Radio Linked Interferometer Network at a radio frequency of 5 GHz. The positions are estimated to be accurate at the 5 mas level. Positions were obtained directly in the ICRF by phase referencing the…