摘要: Growing evidence reveals universal hardening on various cosmic ray spectra, e.g. proton, positron,
as well as antiproton fraction. Such universality may indicate they have a common origin. In this
paper, we argue that these widespread excesses can be accounted for by a nearby supernova remnant
surrounded by a giant molecular cloud. Secondary cosmic rays (p, e+) are produced through the
collisions between the primary cosmic ray nuclei from this supernova remnant and the molecular
gas. Different from the background, which is produced by the ensemble of large amount of sources
in the Milky Way, the local injected spectrum can be harder. The time-dependent transport of
particles would make the propagated spectrum even harder. Under this scenario, the anomalies of
both primary (p, e−) and secondary (e+, ¯p/p) cosmic rays can be properly interpreted. We further
show that the TeV to sub-PeV anisotropy of proton is consistent with the observations if the local
source is relatively young and lying at the anti-Galactic center direction.