Effect of quintessence dark energy on the shadow of Hayward black holes with spherical accretion

It is expected that the astrophysical black holes are surrounded by a luminous accretion flow that is a necessary ingredient for imaging a black hole. In this paper, we study the influence of quintessence dark energy on the shadow images of a Hayward black hole surrounded by the static/infalling spherical accretion flow. We find the effect of the state parameter of quintessence matter on the horizons, photon sphere and impact parameter of the quintessence Hayward black hole. The observed specific intensity of the shadow and also the shadow and photon ring luminosities of the quintessence Hayward black hole with two different spherical accretion flows are investigated. We also use the Event Horizon Telescope observational data of Sgr A* and M87* to constrain the free parameters of quintessence Hayward black hole. Finally, by comparison the results of quintessence Hayward black holes with quintessence Schwarzschild and Hayward black holes we find that the effect of quintessence matter on the black hole shadow is more significant than the regularity effect. (author)