When one conveys certain things, particularly of such gravity, should one not then appropriately cite sources, authorities...
QuoteWhen some of the biggest stars reach the end of their lives, they explode in spectacular supernovas and leave behind incredibly dense cores called neutron stars. Some of these remnants emit powerful radio beams from their magnetic poles.
As the star spins, these beams sweep past Earth and produce periodic pulses of radio waves, much like a cosmic lighthouse. This behaviour has earned them the name "pulsars".
Pulsars typically spin incredibly fast, often completing a full rotation in just seconds – or even less. Over the last three years, some mysterious objects have emerged that emit periodic radio pulses at much slower intervals, which is hard to explain with our current understanding of neutron stars.
In new research, we have found the slowest cosmic lighthouse yet – one that spins once every 6.5 hours. This discovery, published in Nature Astronomy, pushes the boundaries of what we thought possible.
Our slow lighthouse also happens to be aligned with Earth in a way that lets us see radio pulses from both its magnetic poles. This rare phenomenon is a first for objects spinning this slowly and offers a new window into how these stars work.
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[A]ccording to what we know about neutron stars, ASKAP J1839-0756 shouldn't even exist.
Neutron stars emit radio pulses by converting their rotational energy into radiation. Over time, they lose energy and slow down.
Standard theory says that once a neutron star's spin slows beyond a certain point (about one rotation per minute), it should stop emitting radio pulses altogether. Yet here is ASKAP J1839-0756, lighting up the cosmos at a leisurely pace of one rotation every 6.5 hours.
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QuoteAbstract:
Long-period radio transients are a new class of astronomical objects characterized by prolonged periods ranging from 18 min to 54 min. They exhibit highly polarized, coherent, beamed radio emission lasting only 10–100 s. The intrinsic nature of these objects is subject to speculation, with highly magnetized white dwarfs and neutron stars being the prevailing candidates.
Here we present ASKAP J183950.5−075635.0, boasting the longest known period of this class at 6.45 h. It exhibits emission characteristics of an ordered dipolar magnetic field, with pulsar-like bright main pulses and weaker interpulses offset by about half a period that are indicative of an oblique or orthogonal rotator.
This phenomenon, observed in a long-period radio transient, confirms that the radio emission originates from both magnetic poles and that the observed period corresponds to the rotation period. The spectroscopic and polarimetric properties of ASKAP J183950.5−075635.0 are consistent with a neutron star origin, and this object is a crucial piece of evidence in our understanding of long-period radio sources and their links to neutron stars.