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A stellar circle of life near Cygnus X-3

22 November 2016 Astronomy Now

A discovery that provides a new way to study how stars form has been captured in a new portrait from NASA’s Chandra X-ray Observatory and the Smithsonian’s Submillimetre Array (SMA). A cloud that is giving birth to stars has been observed to reflect X-rays from Cygnus X-3, a source of X-rays produced by a system where a massive star is slowly being eaten by its companion black hole or neutron star.

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Mapping the cosmic web with fast radio bursts

21 November 2016 Astronomy Now

Fast radio bursts, or FRBs, are mysterious flashes of radio waves originating outside our Milky Way galaxy. A team of scientists, jointly led by Caltech postdoctoral scholar Vikram Ravi and Curtin University research fellow Ryan Shannon, has now observed the most luminous FRB to date, called FRB 150807.

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A death star’s ghostly glow

28 October 2016 Astronomy Now

The eerie glow of a dead star, which exploded long ago as a supernova, reveals itself in this NASA Hubble Space Telescope image of the Crab Nebula in the constellation of Taurus. But don’t be fooled. The ghoulish-looking object still has a pulse. Buried at its centre is the star’s telltale heart — a neutron star which beats with rhythmic precision.

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Mysterious flaring X-ray objects discovered in nearby galaxies

26 October 2016 Astronomy Now

Astronomers have found a pair of extraordinary cosmic objects that dramatically burst in X-rays, flaring up to become about a hundred times brighter in less than a minute, before returning to original X-ray levels after about an hour. This discovery may represent a new class of explosive events found in space.

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Millisecond pulsars in globular cluster 47 Tucanae

3 October 2016 Astronomy Now

Pulsars are rapidly spinning neutron stars that emit electromagnetic radiation in a sweeping, lighthouse-like beam. They are dramatic, powerful probes of supernovae, their progenitor stars. Astronomers have measured the orbital parameters of four millisecond pulsars in the globular cluster 47 Tucanae and modelled their possible formation and evolution paths.

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Record-breaking extragalactic gamma-ray binary found

30 September 2016 Astronomy Now

Using data from NASA’s Fermi Gamma-ray Space Telescope and other facilities, an international team has found the first gamma-ray binary in another galaxy and the most luminous one ever seen. The dual-star system, dubbed LMC P3, contains a massive star and a crushed stellar core that interact to produce a cyclic flood of gamma rays.

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Young magnetar likely slowest pulsar ever detected

9 September 2016 Astronomy Now

Using X-ray observatories, astronomers have found evidence for what is likely one of the most extreme pulsars, or rotating neutron stars, ever detected. The source exhibits properties of a highly magnetised neutron star, or magnetar, yet its deduced spin period of 6⅔ hours is thousands of times longer than any pulsar ever observed.

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Chandra X-ray Observatory finds evidence for violent stellar merger

16 July 2016 Astronomy Now

Gamma-ray bursts, or GRBs, are some of the most violent and energetic events in the universe. Although these events are the most luminous explosions astronomers can observe, a new study using NASA’s Chandra X-ray Observatory, NASA’s Swift satellite and other Earth-based telescopes suggests that scientists may be missing a majority of these powerful cosmic detonations.

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Hubble captures the beating heart of the Crab Nebula

7 July 2016 Astronomy Now

This new NASA/ESA Hubble Space Telescope image reveals the beating heart of one of the most visually appealing, and most studied, supernova remnants known — the Crab Nebula in the constellation Taurus. At the centre of this nebula the spinning core of a deceased star breathes life into the gas that surrounds it.