We report strict upper limits to the radio luminosities of three neutron star low-mass X-ray binaries obtained with the Very Large Array while they were in hard X-ray states as observed with the Rossi X-ray Timing Explorer: 1E 1724–307, 4U 1812–12, and SLX 1735–269. We compare these upper limits to the radio luminosities of several black hole binaries in very similar hard states, and find that ...

The majority of the ultraluminous X-ray sources (ULXs) in external galaxies are believed to be accreting black holes in binary systems; some of the black holes could be as massive as ∼ 100 − 1000M⊙. We have performed evolution calculations for intermediate-mass black hole X-ray binaries, assuming they are formed in dense star clusters via tidal capture. The results are compared with those for s...

We study the accretion/ejection processes (i.e. disc/jet coupling) in the neutron star X-ray binary Aquila X-1 via a multi-wavelength approach. We use in the radio band the publicly available Very Large Array archive containing observations of the object between 1986–2005, in the X-ray band the archival Rossi X-ray Timing Explorer data (Proportional Counter Array and High Energy X-ray Timing Ex...

A correlation of X-ray source and H α emission-line object catalogues in the Small Magellanic Cloud (SMC) shows that more than two thirds of the optically identified Be stars in Be/X-ray binaries are found as emission-line objects in the catalogues. On the basis of this result we propose up to 25 X-ray sources mainly from recent ROSAT catalogues as new Be/X-ray bina-ries and give their likely o...

1 Contents 9 Jets from X-ray binaries page 1 9.1 History 2 9.2 Physical properties of the jets 3 9.3 Ubiquity 14 9.4 Disc–jet coupling in black hole binaries 15 9.5 Disc-jet coupling in neutron star binaries 26 9.6 High energy / particle emission from jets 29 9.7 Interactions 32 9.8 Relation to other jet sources 34 9.9 On the origin of jets 36 9.10 Conclusions 39 Bibliography 40 9.1 History Rel...

The Galactic black hole X-ray binary XTE J1650–500 entered a quiescent regime following the decline from the 2001–2002 outburst that led to its discovery. Here we report on the first detection of its quiescent counterpart in a 36 ks observation taken in 2007 July with the Chandra X-ray Observatory. The inferred 0.5–10 keV unabsorbed flux is in the range 2.5–5.0 × 10 erg s cm. Notwithstanding la...

We have identified the third known accretion-powered millisecond pulsar, XTE J0929−314, with the Rossi X-Ray Timing Explorer. The source is a faint, high–Galactic-latitude X-ray transient in the Galactic bulge (d & 9 kpc) that was in outburst during 2002 April–June. The 185 Hz (5.4 ms) pulsation had a fractional rms amplitude of 3–7% and was generally broad and sinusoidal, although occasionally...

During five years of Chandra observations, we have identified seven X-ray transients located within 23 pc of Sgr A. These sources each vary in luminosity by more than a factor of 10, and have peak X-ray luminosities greater than 5 × 10 erg s, which strongly suggests that they are accreting black holes or neutron stars. The peak luminosities of the transients are intermediate between those typic...