RXTE confirmation of the intermediate polar status of IGR J15094-6649

TL;DR

This study confirms IGR J15094-6649 as an intermediate polar by analyzing RXTE X-ray data, revealing its spin period, spectral characteristics, and absorption features consistent with this class.

Contribution

The paper provides the first detailed X-ray analysis confirming the intermediate polar status of IGR J15094-6649 using RXTE data.

Findings

Spin period of 809.7 seconds identified.

Spectrum fits a Bremsstrahlung or power-law model.

Presence of iron emission line and absorption features.

Abstract

Aims. To establish the X-ray properties of the intermediate polar candidate IGR J15094-6649 and therefore confirm its inclusion into the class. Methods. 42 856 s of X-ray data from RXTE was analysed. Frequency analysis was used to constrain temporal variations and spectral analysis used to characterise the emission and absorption properties. Results. A spin period of 809.7+-0.6 s is present, revealed as a complex pulse profile whose modulation depth decreases with increasing X-ray energy. The spectrum is well fitted by either a 19+-4 keV Bremsstrahlung or Gamma=1.8+-0.1 power law, with an iron emission line feature and significant absorption in each case. Conclusions. IGR J15094-6649 is confirmed to be an intermediate polar.