Astrophysics and Space Science
From X-Ray Binaries to Quasars: Black Holes on all Mass Scales
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Article
An extremely powerful long-lived superluminal ejection from the black hole MAXI J1820+070
Black holes in binary systems execute patterns of outburst activity where two characteristic X-ray states are associated with different behaviours observed at radio wavelengths. The hard state is associated wi...
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Article
Observation of inverse Compton emission from a long γ-ray burst
Long-duration γ-ray bursts (GRBs) originate from ultra-relativistic jets launched from the collapsing cores of dying massive stars. They are characterized by an initial phase of bright and highly variable radi...
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Article
Nine-hour X-ray quasi-periodic eruptions from a low-mass black hole galactic nucleus
In the past two decades, high-amplitude electromagnetic outbursts have been detected from dormant galaxies and often attributed to the tidal disruption of a star by the central black hole1,2. X-ray emission from ...
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Article
An elevation of 0.1 light-seconds for the optical jet base in an accreting Galactic black hole system
Relativistic plasma jets are observed in many systems that host accreting black holes. According to theory, coiled magnetic fields close to the black hole accelerate and collimate the plasma, leading to a jet ...
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Article
Regulation of black-hole accretion by a disk wind during a violent outburst of V404 Cygni
A sustained, neutral wind from the outer accretion disk is observed in the transient black hole V404 Cygni during a violent outburst; this unusual wind, which expands at one per cent of the speed of light and ...
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Article
A close-pair binary in a distant triple supermassive black hole system
A triple supermassive black hole system has been found that shows helical modulation of the large-scale radio jets; this modulation is caused by two of the black holes being tightly coupled as a binary system.
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Article
Active galactic nuclei as scaled-up Galactic black holes
The central engines that drive active galactic nuclei are thought to be supermassive black holes. A long-standing question in astrophysics is whether these central engines vary like Galactic black hole systems...
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Article
Finding Faint Intermediate-Mass Black Holes in the Radio Band
We discuss the prospects for detecting faint intermediate-mass black holes, such as those predicted to exist in the cores of globular clusters and dwarf spheroidal galaxies. We briefly summarize the difficulti...
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Article
An expanding radio nebula produced by a giant flare from the magnetar SGR 1806–20
On 27 December last year, SGR1806–20, a soft γ-ray repeater in Sagittarius, released a giant flare that has been called the brightest explosion ever recorded. SGRs are X-ray stars that sporadically emit low-en...
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Book
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Chapter
Finding faint intermediate-mass black holes in the radio band
We discuss the prospects for detecting faint intermediate-mass black holes, such as those predicted to exist in the cores of globular clusters and dwarf spheroidal galaxies.We briefly summarize the difficultie...
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Article
Circular Polarisation Observations of SS433
We present four epochs of observations of the Galactic X-ray binarySS433 using the Australian Telescope Compact Array (ATCA). These observations, taken on 4 February, 29 February, 23 March and 27 June 2000, at...
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Chapter and Conference Paper
Black-Hole States and Radio-Jet Formation
An empirical relation between ‘canonical’ X-ray states in black hole X-ray binaries and radio emission is presented. In the Low/Hard state a quasi-continuous radio-emitting jet is produced. In the High/Soft st...
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Chapter and Conference Paper
The Disc — Jet Connection in GRS 1915+105
We present an analysis of simultaneous X-ray and radio observations of the black hole candidate GRS 1915+105.
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Article
The Disc – Jet Connection in GRS 1915+105
We present an analysis of simultaneous X-ray and radio observations of the black hole candidate GRS 1915+105.
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Chapter
Galactic Clues About the High-Energy Processes in BL Lac (AGN) Jets
Active galactic nuclei (AGN) jets are the source of many outstanding puzzles in astrophysics. Not least of these is the question of how these jets are formed, and how they are related to the central massive bl...
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Chapter
ISOCAM Observations of CYG X-3: Search for a Hot Stellar Wind
Six CAM observations have been made in the 4–14µm wavelength region to search for further evidence of emission from a hot stellar wind. Initial results suggest that the spectrum detected by Fender et al. using UK...
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Article
ASOCAM Observations of CYG X-3: Search for a Hot Stellar Wind
Six CAM observations have been made in the 4 - 14 µm wavelength region to search for further evidence of emission from a hot stellar wind. Initial results suggest that the spectrum detected by Fender et al. us...
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Chapter
Rapid Infrared Flares in Cygnus X-3
We present infrared data on the highly variable and energetic galactic X-ray binary Cygnus X-3. The data includes high time resolution simultaneous H- and K-band photometry taken while Cygnus X-3 was flaring v...
