Broadband Suzaku observations of IGR J16207-5129

TL;DR

This study uses Suzaku's broad energy range observations to analyze IGR J16207-5129, revealing its classification as an absorbed HMXB with potential eclipse features and neutron star characteristics.

Contribution

The paper provides the first broad-band spectral analysis of IGR J16207-5129 with unprecedented sensitivity above 15 keV, confirming its nature as an absorbed HMXB and constraining its spectral cutoff.

Findings

Measured large intrinsic absorption of nH = 16.2 x 10^22 /cm2

Constrained the cutoff energy at 19 keV, indicating a neutron star primary

Detected a possible eclipse phase with no flux

Abstract

An analysis of IGR J16207-5129 is presented based on observations taken with Suzaku. The data set represents ~80 ks of effective exposure time in a broad energy range between 0.5 and 60 keV, including unprecedented spectral sensitivity above 15 keV. The average source spectrum is well described by an absorbed power law in which we measured a large intrinsic absorption of nH = 16.2(-1.1/+0.9)x10^22 /cm2. This confirms that IGR J16207-5129 belongs to the class of absorbed HMXBs. We were able to constrain the cutoff energy at 19(-4/+8) keV which argues in favor of a neutron star as the primary. Our observation includes an epoch in which the source count rate is compatible with no flux suggesting a possible eclipse. We discuss the nature of this source in light of these and of other recent results.