Kavli Affiliate: Kejia Lee
| First 5 Authors: R. Nicolas Caballero, Heng Xu, Kejia Lee, Siyuan Chen, Yanjun Guo
| Summary:
We derive the gravitational-wave (GW) strain upper limits from resolvable
supermassive black-hole binaries using the data from the Five-hundred-meter
Aperture Spherical radio Telescope (FAST), in the context of the Chinese Pulsar
Timing Array project. We focus on circular orbits in the $mu$Hz GW frequency
band between $10^{-7}$ and $3times10^{-6}$ Hz. This frequency band is higher
than the traditional pulsar timing array band and is less explored. We used the
data of the millisecond pulsar PSR J1713+5307 observed between August 2019 and
April 2021. A dense observation campaign was carried out in September 2020 to
allow for the $mu$Hz band coverage. Our sky-average continuous source upper
limit at the 95% confidence level at 1$mu$Hz is 1.26$times10^{-12}$, while
the same limit in the direction of the pulsar is 4.77$times10^{-13}$.
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