摘要
In this paper,we present the Five-hundred-meter Aperture Spherical radio Telescope(FAST)observations of PSRs B1929+10 and B1842+14.Through analysis of the pulsars’scintillation pattern,we detected the known scintillation arc from PSR B1929+10 and two previously undetected scintillation arcs from B1842+14.We find that the B1929+10 arc’s curvature scales with observing frequency asη-∝ν-2.1±0.1 andη+∝ν-1.8±0.2,consistent with Arecibo results and the theoretical expectations ofη∝ν-2.From the arc curvature,we infer the scattering screen to be located at 0.20±0.02 kpc from the Earth,close to what was measured by RadioAstron at 324 MHz.From B1842+14,we find two scintillation arcs for the first time.The arcs’curvatures imply that they are caused by two scattering screens located at a distance of 0.3±0.2 kpc and 1.6±0.6 kpc from the Earth,respectively.The screen distance uncertainties mainly come from the uncertainty in pulsar’s dispersion measure(DM)-derived distance.We present these FAST scintillation observations and discuss the future prospect of FAST pulsar scintillation study.
基金
supported by the CAS“Light of West China”Program 2017-XBQNXZ-B-022
the“Tianchi Doctoral Program 2017”
the CAS International Partnership Program(No.114A11KYSB20160008)
the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB23000000)
supported by the National Natural Science Foundation of China(Grant Nos.61472043,11743002,11873067,11690024,11725313 and U1831104)
supported by the Chinese Academy of Science Pioneer Hundred Talents Program
supported by Special Funding for Advanced Users,budgeted and administrated by Center for Astronomical MegaScience,Chinese Academy of Sciences(CAMS)