FAST early pulsar discoveries: Effelsberg follow-up
M. Cruces, D. J. Champion, D. Li, M. Kramer, W. W. Zhu, P. Wang, A. D., Cameron, Y. T. Chen, G. Hobbs, P. C. C. Freire, E. Graikou, M. Krco, Z. J., Liu, C. C. Miao, J. Niu, Z. C. Pan, L. Qian, M. Y. Xue, X. Y. Xie, S. P.You,, X. H. Yu, M. Yuan, Y. L. Yue

TL;DR
This paper reports follow-up observations of 10 pulsars discovered by FAST, revealing a population of older pulsars and characterizing two notable sources, thereby enhancing pulsar understanding and Galactic electron density models.
Contribution
It presents the first Effelsberg follow-up of FAST-discovered pulsars, identifying unique pulsar properties and highlighting discrepancies in electron density models, advancing pulsar and Galactic studies.
Findings
Discovery of a young, highly polarized pulsar visible up to 8 GHz.
Identification of a wide-orbit, massive white dwarf companion pulsar.
Detection of discrepancies in electron density models in certain sky regions.
Abstract
We report the follow-up of 10 pulsars discovered by the Five-hundred-meter Aperture Spherical radio-Telescope (FAST) during its commissioning. The pulsars were discovered at a frequency of 500-MHz using the ultra-wide-band (UWB) receiver in drift-scan mode, as part of the Commensal Radio Astronomy FAST Survey (CRAFTS). We carried out the timing campaign with the 100-m Effelsberg radio-telescope at L-band around 1.36 GHz. Along with 11 FAST pulsars previously reported, FAST seems to be uncovering a population of older pulsars, bordering and/or even across the pulsar death-lines. We report here two sources with notable characteristics. PSR J19514724 is a young and energetic pulsar with nearly 100% of linearly polarized flux density and visible up to an observing frequency of 8 GHz. PSR J2338+4818, a mildly recycled pulsar in a 95.2-d orbit with a Carbon-Oxygen white dwarf (WD)…
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