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The Cassiopeia A Supernova remnant and its Central Compact Object in X-rays

The Cassiopeia A Supernova remnant and its Central Compact Object as seen by the Chandra X-ray telescope

Credit: NASA/CXC/SAO

Dr. Bettina Posselt

Research Scientist / Affiliate Associate Research Professor (PSU)

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • MeerKAT
  • Pulsars, transients and relativistic astrophysics
  • The Square Kilometre Array (SKA)
bettina.posselt@physics.ox.ac.uk
  • About
  • Publications

A Coherent Radio Burst from an X-Ray Neutron Star in the Carina Nebula

The Astrophysical Journal Letters American Astronomical Society 985:1 (2025) L3-L3

Authors:

KM Rajwade, J Tian, G Younes, B Posselt, B Stappers, Z Wadiasingh, ED Barr, MC Bezuidenhout, M Caleb, F Jankowski, M Kramer, I Pastor-Marazuela, M Surnis

Abstract:

Abstract The neutron star zoo comprises several subpopulations that range from energetic magnetars and thermally emitting X-ray neutron stars to radio-emitting pulsars. Despite studies over the last five decades, it has been challenging to obtain a clear physical link between the various populations of neutron stars, vital to constrain their formation and evolutionary pathways. Here we report the detection of a burst of coherent radio emission from a known radio-quiet, thermally emitting neutron star 2XMM J104608.7−594306 in the Carina Nebula. The burst has a distinctive sharp rise followed by a decay made up of multiple components, which is unlike anything seen from other radio-emitting neutron stars. It suggests an episodic event from the neutron star surface, akin to transient radio emission seen from magnetars. The radio burst confirms that the X-ray source is a neutron star and suggests a new link between these apparently radio-quiet X-ray-emitting sources and other transient or persistent radio-emitting neutron stars. It also suggests that a common physical mechanism for emission might operate over a range of magnetic field strengths and neutron star ages. We propose that 2XMM J104608.7−594306 straddles the boundary between young, energetic neutron stars and their evolved radio-emitting cousins and may bridge these two populations. The detection of such a radio burst also shows that other radio-quiet neutron stars may also emit such sporadic radio emission that has been missed by previous radio surveys and highlights the need for regular monitoring of this unique subpopulation of neutron stars.
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The Thousand-Pulsar-Array programme on MeerKAT – XVI. Mapping the Galactic magnetic field with pulsar observations

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2025) staf645

Authors:

LS Oswald, P Weltevrede, B Posselt, S Johnston, A Karastergiou, ME Lower
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The middle-aged pulsar PSR J1741-2054 and its bow-shock nebula in the far-ultraviolet

Astronomy & Astrophysics EDP Sciences (2025)

Authors:

Vadim Abramkin, George G Pavlov, Yuriy Shibanov, B Posselt, Oleg Kargaltsev
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NICER Timing of the X-Ray Thermal Isolated Neutron Star RX J0806.4–4123

The Astrophysical Journal American Astronomical Society 972:2 (2024) 197

Authors:

B Posselt, GG Pavlov, WCG Ho, F Haberl
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Probing the Spectrum of the Magnetar 4U 0142+61 with JWST

The Astrophysical Journal American Astronomical Society 972:2 (2024) 176

Authors:

Jeremy Hare, George G Pavlov, Bettina Posselt, Oleg Kargaltsev, Tea Temim, Steven Chen
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