Variable Source of Radio Frequency Radiation in the Constellation of Cygnus

Bolton, J. G.; Stanley, G. J.

doi:10.1038/161312b0

Cited by 83 publications

(28 citation statements)

References 8 publications

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“…The formerly Soviet, now Russian, RadioAstron (Kardashev and Slysh 1988;Kardashev 1997) and Japanese VSOP missions (Hirabayashi et al 1998) were later funded, with RadioAstron targeted at high brightness source observations and VSOP aiming for a better imaging capability. Dedicated space VLBI was finally realised with the launch of the VSOP spacecraft, HALCA, in February 1997, thirty years after the first VLBI experiments by Canadian, US and British radioastronomers, and half a century after the first detection of fringes by the cliff-top interferometer in Sydney (Bolton and Stanley 1948).…”

Section: Historical Introduction To Space Vlbimentioning

confidence: 99%

Space VLBI

Hirabayashi

2001

Symp. - Int. Astron. Union

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Space VLBI enables high angular resolution and high dynamic range imaging through an extension of ground-based VLBI. The TDRSS space VLBI experiments in the 1980s were followed by the first space VLBI imaging mission, VSOP, in the 1990s. The new century holds the promise of the VSOP-2 and ARISE missions, which aim for more sensitive, higher angular resolution and higher observing frequency capabilities. These missions will enable AGNs to be viewed much more clearly and will make broader science areas, including lower brightness sources, accessible. It is noted that in all space VLBI missions, international collaboration in global sense plays an important role.

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Section: Historical Introduction To Space Vlbimentioning

confidence: 99%

Space VLBI

Hirabayashi

2001

Symp. - Int. Astron. Union

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“…M 87 (Virgo A, 3C 274) is one of the first known extragalactic radio sources and its halo is the first extragalactic X-ray source to have been identified (Bolton & Stanley 1948;Byram et al 1966). The highly peaked surface brightness profile of the extended X-ray emission subsequently observed with EINSTEIN implied an X-ray gas cooling time considerably smaller than the Hubble time, leading to the suggestion that M 87 harbours a significant "cooling flow" with a mass condensation rate of ∼10 M yr −1 (Stewart et al 1984;Fabian et al 1984).…”

Section: Introductionmentioning

confidence: 99%

XMM-Newton observations of M 87 and its X-ray halo

Böhringer

Belsole

Kennea

et al. 2001

A&A

158

174

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Abstract. We report performance verification observations of the giant elliptical galaxy M 87 in the Virgo Cluster with the MOS, pn, and optical monitor instruments on board of XMM-Newton. With the energy sensitive imaging instruments MOS and pn we obtain the first spatially constrained X-ray spectra of the nucleus and the jet of the galaxy. The good photon statistics of the pn and MOS allow a detailed analysis of the radial temperature and abundance distribution of 6 elements. The data provide no indication of a multi-temperature structure for radii ≥2 . An apparent sharp metal abundance drop deduced for the regions inside this radius is probably due to resonant line scattering.

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“…It is clear that the angular diameter of Cygnus A is much less than that of the Sun. The details of this important discovery were first published in Nature by Bolton & Stanley (1948).…”

Section: Figure 11mentioning

confidence: 99%

Early Australian Optical and Radio Observations of Centaurus A

Robertson

Cozens

Orchiston

et al. 2010

Publ. – Astron. Soc. Aust

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Abstract:The discovery of the radio source Centaurus A and its optical counterpart NGC 5128 were important landmarks in the history of Australian astronomy. NGC 5128 was first observed in August 1826 by James Dunlop during a survey of southern objects at the Parramatta Observatory, west of the settlement at Sydney Cove. The observatory had been founded a few years earlier by Thomas Brisbane, the new governor of the British colony of New South Wales. Just over 120 years later, John Bolton, Gordon Stanley and Bruce Slee discovered the radio source Centaurus A at the Dover Heights field station in Sydney, operated by CSIRO's Radiophysics Laboratory (the forerunner to CSIRO Astronomy and Space Sciences). This paper will describe this early historical work and summarize further studies of Centaurus A by other Radiophysics groups up to 1960.

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Variable Source of Radio Frequency Radiation in the Constellation of Cygnus

Cited by 83 publications

References 8 publications

Space VLBI

Space VLBI

XMM-Newton observations of M 87 and its X-ray halo

Early Australian Optical and Radio Observations of Centaurus A

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