Using NASA’s NuSTAR and Swift space observatories, Indian astronomers have inspected an X-ray pulsar known as XTE J1858+034 during its outburst and identified a low-frequency quasi-periodic oscillation (QPO) from this source. The finding is reported in a paper published January 22 on the arXiv pre-print repository.
![](https://scx1.b-cdn.net/csz/news/tmb/2021/newquasiperi.jpg)
Source:
https://phys.org/news/2021-02-quasi-periodic-oscillation-xte-j1858034.html