Determine whether pulsar radio emission is intrinsically narrowband or broadband

Determine whether pulsar emission is inherently narrowband, with different frequencies generated at distinct altitudes and thereby producing radius-to-frequency mapping, or broadband, with a single emission region producing radiation across a wide frequency range, using frequency-dependent pulse-profile morphology as an empirical test.

Background

The paper explains that distinguishing between intrinsically narrowband and broadband pulsar emission is important for testing theoretical models of pulsar emission. In the narrowband scenario, different radio frequencies would be generated at distinct altitudes, leading to radius-to-frequency mapping; in the broadband scenario, a single emission region would produce radiation across a wide frequency range.

The authors note that the two scenarios may produce different frequency dependence in pulse microstructure and profile morphology. In particular, determining whether pulse components shift in position or change only in width could provide an empirical way to discriminate between them. However, the question remains unresolved and requires improved separation of intrinsic profile evolution from low-frequency interstellar dispersion and scattering effects.