2022NatAs...6..698W -
Nature Astronomy, 6, 698-702 (2022/June-0)
Radio pulsations from a neutron star within the gamma-ray binary LS I +61° 303.
WENG S.-S., QIAN L., WANG B.-J., TORRES D.F., PAPITTO A., JIANG P., XU R., LI J., YAN J.-Z., LIU Q.-Z., GE M.-Y. and YUAN Q.-R.
Abstract (from CDS):
LS I +61° 303 is one of the rare gamma-ray binaries that emit most of their luminosity in photons with energies beyond 100 MeV (ref. 2). It is well characterized-the ∼26.5 day orbital period is clearly detected at many wavelengths-and other aspects of its multifrequency behaviour make it the most interesting example of its class. The morphology of high-resolution radio images changes with orbital phase, displaying a cometary tail pointing away from the high-mass star component and LS I +61° 303 also shows superorbital variability. A couple of energetic (∼1037 erg s-1), short, magnetar-like bursts have been plausibly ascribed to it. Although the phenomenology of LS I +61° 303 has been the subject of theoretical scrutiny for decades, there has been a lack of certainty regarding the nature of the compact object in the binary that has hampered our understanding of the source. Here, using observations with the Five-hundred-meter Aperture Spherical radio Telescope, we report the existence of transient radio pulsations from the direction of LS I +61° 303 with a period P = 269.15508 ± 0.00016 ms at a significance of >20σ. These pulsations strongly argue for the existence of a rotating neutron star within LS I +61° 303.
Abstract Copyright:
©
Journal keyword(s):
Astrophysics - High Energy Astrophysical Phenomena
Simbad objects:
4
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