# The Timing Noise of Magnetars

## TL;DR

This paper analyzes the timing noise of magnetars and related sources, revealing a correlation between noise strength and spin-down rate, and applies Bayesian methods to study transient QPO features.

## Contribution

It provides a comparative analysis of noise strength across magnetars and accreting sources, and introduces Bayesian analysis of transient QPOs in 4U 1907+09.

## Key findings

- Noise strength scales with spin-down rate.
- Higher spin-down rate causes increased torque noise.
- Bayesian analysis of transient QPOs in 4U 1907+09.

## Abstract

We represent noise strength analysis of Anomalous X-Ray Pulsars (AXPs) 4U 0142+61, 1RXS J170849.9-400910, 1E 1841-045, 1E 2259+586 and Soft Gamma Repeaters (SGRs) SGR J1833-0832, SWIFT J1822.3-1606 and SWIFT J1834.9-0846 together with the X-Ray binaries GX 1+4 and 4U 1907+09 for comparison with accreting sources. Using our timing solutions, we extracted residuals of pulse arrival times after removal of spin down trends and we calculated assoicated noise strength of each source. Our preliminary results indicate that the noise strength is scaling up with spin-down rate. This indicates that, increase in spin-down rate leads to more torque noise on the magnetars. In addition, we present our analysis with Bayesian statistics on the previously reported transient QPO feature of 4U 1907+09.