Maps of Centaurus A from Molonglo and Culgoora

Slee, O. B.; Sheridan, K. V.; Dulk, G. A.; Little, A. G.

doi:10.1017/s132335800001701x

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…Bending and buoyancy effects (e.g. 119,235,283) may also be present and--unless the jet is denser than the ambient medium--lateral motions may excite surface instabilities, whose growth also alters the shape of the jet (12). Linear instability theory may be inadequate to describe any mode that grows sufficiently to become detectable on radio maps.…”

Section: Jet Wigglingmentioning

confidence: 99%

Extragalactic Radio Jets

Bridle¹,

Perley²

1984

Annu. Rev. Astron. Astrophys.

552

374

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Section: Jet Wigglingmentioning

confidence: 99%

Extragalactic Radio Jets

Bridle¹,

Perley²

1984

Annu. Rev. Astron. Astrophys.

552

374

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“…Although a VLA map published in 1981 offered more fine detail in the central region, the Australian observations provided flux densities and spectral data for the two inner lobes of this galaxy. Finally, Slee, Sheridan, Dulk and Little (1983) concluded by discussing possible mechanisms that could explain the galaxy's radio and X-ray emission.…”

Section: Figure 50mentioning

confidence: 99%

From the Solar Corona to Clusters of Galaxies: The Radio Astronomy of Bruce Slee

Orchiston¹

2004

Publ. – Astron. Soc. Aust

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Owen Bruce Slee is one of the pioneers of Australian radio astronomy. During World War II he independently discovered solar radio emission, and, after joining the CSIRO Division of Radiophysics, used a succession of increasingly more sophisticated radio telescopes to examine an amazing variety of celestial objects and phenomena. These ranged from the solar corona and other targets in our solar system, to different types of stars and the ISM in our Galaxy, and beyond to distant galaxies and clusters of galaxies. Although long retired, Slee continues to carry out research, with emphasis on active stars and clusters of galaxies. A quiet and unassuming man, Slee has spent more than half a century making an important, wide-ranging contribution to astronomy, and his work deserves to be more widely known.

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“…(2.15) using data from [54] and [55][56][57][58] respectively. This yields enhancement factors of the form…”

mentioning

confidence: 99%

Axion-like particle searches with MeerKAT and SKA

Ayad

Beck

2022

J. Cosmol. Astropart. Phys.

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In the past few years, the search for axion-like particles (ALPs) has grown significantly due to their potential to account for the total abundance of the cold dark matter (CDM) in the universe. The coupling between ALPs and photons allows the spontaneous decay of ALPs into pairs of photons. For ALPs condensed in CDM halos around galaxies, the stimulated decay of ALPs is also possible. In this work, we examine the detectability of the radio emissions produced from this process with forthcoming radio telescopes such as the Square Kilometer Array (SKA) and MeerKAT. Our results, using recent more realistic sensitivity estimates, show that previous non-observation upper-limits projected for the SKA were highly optimistic, with the limits from dwarf galaxy observations being weakened by an order of magnitude at least. Notably, our results also depend far more strongly on ALP mass than previously, due to the inclusion of frequency dependent degradation effects. We show that the strongest potential environment to probe ALPs is nearby radio galaxies (due to the strong photon enhancement factor). In addition, with the use of a visibility taper, ALPs in the mass range of 4.96 × 10-7 − 1.04 × 10-4 eV would have non-observation upper limits on the ALP-photon gaγ in the range of 1.83 × 10-12 − 7.69 × 10-10 GeV-1 with SKA. MeerKAT can only produce limits similar to the CAST experiment within 50 hours of observation. Finally, we demonstrate that magnetic conversion of CDM ALPs to photons, in galactic magnetic fields, is highly sub-dominant, even to spontaneous decay.

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Maps of Centaurus A from Molonglo and Culgoora

Cited by 6 publications

References 17 publications

Extragalactic Radio Jets

Extragalactic Radio Jets

From the Solar Corona to Clusters of Galaxies: The Radio Astronomy of Bruce Slee

Axion-like particle searches with MeerKAT and SKA

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