Now showing items 1-10 of 55
The radial velocity dispersion profile of the Galactic halo: constraining the density profile of the dark halo of the Milky Way
(Blackwell Science Ltd, 2005-12)
We have compiled a new sample of 240 halo objects with accurate distance and radial velocity measurements, including globular clusters, satellite galaxies, field blue horizontal branch (FHB) stars and red giant stars from ...
Radio–optical flux behaviour and spectral energy distribution of the intermediate blazar GC 0109+224
(Blackwell Science Ltd, 2004-03)
About 20 years of radio observations of the BL Lac object GC 0109+224 (S2 0109+22, RGB J0112+227) in five bands (from 4.8 to 37 GHz) are presented and analysed together with optical data. Over the past 10 years this blazar ...
Evolution of the dark matter phase-space density distributions of ΛCDM haloes
(Blackwell Publishing Ltd, 2009-05-21)
We study the evolution of phase-space density during the hierarchical structure formation of Λ cold dark matter (CDM) haloes. We compute both a spherically averaged surrogate for phase-space density ( Q =Ρ/Σ 3 ) and the ...
The L X – T relation and intracluster gas fractions of X-ray clusters
(Blackwell Science Ltd, 1999-05-21)
We re-examine the X-ray luminosity–temperature relation using a nearly homogeneous data set of 24 clusters selected for statistically accurate temperature measurements and absence of strong cooling flows. The data exhibit ...
Three-dimensional dust radiative-transfer models: the Pinwheel Nebula of WR 104
(Blackwell Science Ltd, 2004-05)
We present radiative-transfer modelling of the dusty spiral Pinwheel Nebula observed around the Wolf–Rayet/OB-star binary WR 104. The models are based on the three-dimensional radiative-transfer code torus, modified to ...
HR 710 (HD 15144): an ultra-Sr-rich, magnetic Ap star with a close companion ★
(Blackwell Publishing Ltd, 2008-03-11)
The magnetic, chemically peculiar A-star HR 710 (HD 15144, ADS 1849A, AB Cet) has a close companion in a nearly circular orbit. Its 3-d period is unusually short for such stars. The system emits moderately hard X-rays, ...
The imprint of massive black hole formation models on the LISA data stream
(Blackwell Publishing Ltd, 2007-06-01)
The formation, merging and accretion history of massive black holes (MBHs) along the hierarchical build-up of cosmic structures leaves a unique imprint on the background of gravitational waves (GWs) at mHz frequencies. We ...
Implementing TOPbase/Iron Project: continuous absorption from Fe ii
(Blackwell Science Ltd, 2003-06)
We discuss implementation of TOPbase and Iron Project opacities for stellar spectral codes. We use a technique employed by Peach, where a Boltzmann-averaged cross-section is calculated for selected temperatures, and the ...
Journey to the M BH –Σ relation: the fate of low-mass black holes in the Universe
(Blackwell Publishing Ltd, 2009-12-21)
In this paper, we explore the establishment and evolution of the empirical correlation between black hole mass ( M BH ) and velocity dispersion (Σ) with redshift. We trace the growth and accretion history of massive black ...
Constraints on ω 0 and cluster evolution using the ROSAT log N –log S relation
(Blackwell Science Ltd, 1998-04)