Astronomers detect properties of high magnetic field pulsar PSR J1119126127


X-ray folded light curve of PSR J1119126127 from XM-Newton in the energy band 0.5–10.0 kV. Credit: Wang et al., 2020.

Using various space observatories, astronomers have conducted a multi-wavelength study of a high-magnetic-field pulsar known as PSR J1119−6127, which went through an outbreak in 2016. The results throw more light on the properties of this pulsar during subsequent outbreaks of paralysis. Period. The study is detailed in a paper published on August 28 at arxiv.org.


Pulsars are highly magnetized, rotating neutron stars emit a beam of electromagnetic radiation. They are commonly found as short bursts of radio emission, however, some of them are also observed using optical, X-ray and gamma-ray telescopes.

PSR J1119R6127 was discovered in 2000 by the Parkes Multibeam Pulsar Survey, which was connected to supernova remnant G292.2–0.5 at a distance of approximately 27,400 light years. The Pulsar has a spin duration of 0.407 seconds, a typical age of some 1,600 years, and a spin-down power of about 2.3 undecillion erg / s.

In late July 2016, NASA’s Fermi and Swift spacecraft detected PSR J1119R6127 magnetar-like X-ray outbreaks and 13 miniature X-ray bursts. The total energy released during this event was estimated at a level of about 1.0 tredecillion erg. To better understand the development of PSR J1119 understand6127 after the 2016 outbreak, several teams of researchers started monitoring this pulsar.

One such group studied a multi-wavelength (from radio to gamma-ray band) of PSR J1119−6127 under the leadership of Huihui Wang of Huazhong University of Science and Technology in Wuhan, China. For this purpose, they used data from Fermi, Swift, ESA’s X-ray Multi-Mirror Mission (XMM-Newton) and NASA’s Nuclear Spectroscopic Telescope Array (Nustera).

“In this study, we conducted a multi-wavelength study for PSR J1119126127, following its 2016 magnetar-out outbreak,” astronomers wrote in the paper.

Prior to the 2016 outbreak, the XR ray pulse peak of PSR J1119126127 was aligned with its radio pulse peak. There was no tangible change between these peaks after the study. It was noted that the X-ray spectra of the on-pulse and off-pulse phases are well described by two blackbody components and a power-law model.

In general, radio and X-ray emission properties after the 2016 outbreak, as well as the spindown properties of PSR J1119 after6127, were found to be similar to those of the magnetar XTE J1810−197, which were undergoing an X-ray outbreak in 2003. Wang’s study Revealed that the evolution of the solution, radio emission and X-ray emission properties of PSR J1119 radio6127 after its latest outbreak is similar to that of XTE J1810−197. However, the recovery time scale and the total energy released are one or two orders of magnitude smaller in PSR J1119−6127.

When it comes to GeV gamma-ray emissions from PSR J1119126127, the results suggest that it is slightly suppressed around the 2016 outbreak. GeV spectral features (post-rest period) after January 2017 correspond to pre-outbreak periods. In addition, the difference between the gamma-ray peak and the radio peak in the post-relaxation phase is about 0.4, which corresponds to measurements before the 2016 X-ray outbreak.

Considering all the data collected, astronomers concluded that the 2016 X-ray outbreak probably changed the structure of the open field line regions due to PSR J1119−6127and recombination of the global magnetosphere. He also stated that this resumption continued for about one and a half years.


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more information:
Wang et al., A multi-wavelength study of PSR J1119126127 after the 2016 outbreak, arXiv: 2008.12585 [astro-ph.HE] arxiv.org/abs/2008.12585

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