# Insight-HXMT observations of the Crab pulsar

## TL;DR

This paper presents detailed X-ray observations of the Crab pulsar by Insight-HXMT, confirming known spectral features and peak flux ratios across a broad energy range, enhancing understanding of pulsar emission mechanisms.

## Contribution

First high signal-to-noise X-ray profiles of the Crab pulsar from Insight-HXMT, confirming spectral and flux ratio behaviors consistent with previous missions.

## Key findings

- Flux ratio of second to main peak increases with energy
- Peak separation remains constant across energies
- Spectral indices vary with phase and energy

## Abstract

We report on X-ray emission properties of the Crab pulsar(PSR B0531+21) using observations by Insight-HXMT during its first year after launch. We obtained high signal-to-noise profiles in the X-ray energy band 11-250 keV. We have confirmed an increase in the flux ratio of the second peak over the main peak with increasing energy, consistent with other missions. The separation of the two peaks shows no significant trend with increasing energy. The phase-averaged spectrum, fitted by a logpar model, and the phase-resolved spectra of the Crab pulsar, fitted by a powerlaw in the different energy bands of HXMT, are consistent with RXTE and NuSTAR in that photon indices evolve as a function of phase as well as a function of energy contributing to a broadband modeling.