Pulsar PSR J0250+5854 Investigated by Researchers

Pulse profile of PSR J0250+5854 at completely different radio frequencies. Credit: If et al., 2021.

Utilizing ground-based amenities, a global group of astronomers has performed a broadband radio research of a slowly rotating radio pulsar generally known as PSR J0250+5854. The outcomes of this investigation revealed on 1 September arXiv Pre-print servers present extra perception into the character of this supply.

Extraterrestrial sources of radiation with an everyday periodicity, generally known as pulsars, often happen as brief bursts of radio emission. Radio pulsars are generally described as extremely magnetic, quickly rotating neutron stars, which generate pulsed emissions with lighthouse beams of radiation.

With a interval of 23.5 seconds, PSR J0250+5854 is the slowest rotating radio pulsar ever identified. It spins about two occasions slower than the second-slowest spinning radio pulsar, designated PSR J2251-3711, and about 3 times slower than the well-studied pulsar PSR J2144-3933. Earlier observations have proven that PSR J0250+5854 has a a lot bigger light-cylinder (with a radius of about 1.12 million kilometers) and a smaller polar cap (with an estimated diameter of about 60 meters).

Just lately, a group of researchers led by Crispin Egger from the College of Manchester, UK, determined to watch PSR J0250+5854 to shed extra gentle on its properties. To this finish, he made radio observations of this pulsar utilizing the 5 Hundred Meter Aperture Spherical Telescope (FAST), the brand new extensions to the Low Frequency Array (LOFAR) and the Nanke Upgrading loFAR (NenuFAR).

“We have now obtained the best and lowest frequency radio detections of PSR J0250+5854, probably the most slowly rotating radio-emitting pulsar, utilizing simultaneous observations from 57 MHz to 1250 MHz,” the paper’s authors wrote.

Observations by Agar’s group resulted within the first detection of PSR J0250+5854 utilizing FAST at frequencies between 1.0 and 1.5 GHz. Moreover, the NenuFAR detection of PSR J0250+5854 at 57 MHz was the bottom frequency detection of this pulsar ever reported.

The research discovered that PSR J0250+5854 has a flux density of 4.0 µJy at 1250 MHz and a spectral index of roughly −3.5, with a turnover fee of lower than 95 MHz. It was famous that the spectral index is exceptionally secure in comparison with the imply discovered between -1.6 and -1.4 for the pulsar inhabitants.

Moreover, the heart beat profile of PSR J0250+5854 exhibits contraction at low frequencies, opposite to the expectations of radius-to-frequency mapping. It was additionally discovered that the polar cap radio emission of the pulsar is generated round 1.5 GHz at an absolute altitude of a number of lots of of kilometers.

“This confirms that the radio beam may be very slender, as anticipated for sluggish pulsars. Moreover, the dearth of delay between the profile peak and the place angle curve inflection level signifies that the emission of PSR J0250+5854 at 1250 MHz The altitude is low, consistent with these discovered for different non-recycled pulsars,” the astronomers defined.

Astronomers discover the slowest rotating radio pulsar

extra data:
A broadband radio research of PSR J0250+5854: the slowest rotating radio pulsar identified, arXiv:2109.00266 [astro-ph.HE] arxiv.org/abs/2109.00266

Journal data:

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Quotation: Pulsar PSR J0250+5854 Investigation by Researchers (2021, September 9) Retrieved on September 2, 2022 from https://phys.org/information/2021-09-pulsar-psr-j02505854.html.

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