Tomasz Nowakowski is a member of the physics.org community.
A new millisecond X-ray pulsar has been detected by an international team of astronomy. MAXI J1816–195 has a spin period of almost two minutes. There is a paper on the arXiv pre-print repository.
The X-ray intensity can be as short as a fraction of a second. A millisecond X-ray pulsar is a peculiar type of X-ray pulsar in which short spin periods are caused by long- lasting mass transfer from a low-mass companion star through an accretion disk onto a slow- rotating neutron star. Astronomers think that AMXPs are important in furthering our knowledge about thermonuclear burst processes.
Only a few dozen objects of this type have been found so far. In order to expand the list of strange objects, the scientific community is still actively searching for them using space observatories.
A group of astronomer led by Peter Bult of the University of Maryland have reported the discovery of a new AMX. A recently discovered X-ray Transient, named MAXI J1816–195, has pulsations. The Monitor of All-sky X-ray Image (MAXI) onboard the International Space Station identified MAXI J1815–195 on June 7, 2022. The source's nature was confirmed by follow-up observations.
The new X-ray Transient MAXI J1815–195. The researchers wrote in the paper that they observed the first recorded Transient eruption from the low-mass X-ray binaries MAXI J1816–195.
According to the study, MAXI J1816–195 has a spin period of almost two minutes. The donor star was thought to have a mass of between 0.1 and 0.55 solar mass. The upper limit of the distance to this pulsar was found to be over 30,000 light years.
Over time, the 15 thermonuclear X-ray burst from MAXI J1816–195 exhibited a gradual evolution in their appearance. The average time taken for these bursts to come back was over an hour. MAXI J1816–195 is a regular burster with a repeating time that lasts over the course of the burst.
The study found that all of the X-ray bursts had the same evolution. The burst durations show that the material is in a hydrogen rich environment. There was no evidence for burst oscillations in the data.
More information: The discovery of the 528.6 Hz accreting millisecond X-ray pulsar MAXI J1816-195, arXiv:2208.04721 [astro-ph.HE] arxiv.org/abs/2208.04721There is a science network.
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