Non-Detection of Gravitationally Redshifted Absorption Lines in the X-ray Burst Spectra of GS 1826-24
Albert K.H. Kong, Jon M. Miller, Mariano Mendez, Jean Cottam, Walter, H.G. Lewin, Frederik Paerels, Erik Kuulkers, Rudy Wijnands, Michiel van der, Klis
TL;DR
This study analyzed X-ray burst spectra from GS 1826-24 to detect gravitationally redshifted absorption lines but found no such features, contrasting with previous observations of similar phenomena in other neutron stars.
Contribution
The paper presents a detailed search for gravitational redshifted lines in GS 1826-24's burst spectra, providing constraints on neutron star surface features.
Findings
No detectable gravitationally redshifted absorption lines
Spectral analysis consistent with previous non-detections
Comparison with EXO 0748-676 highlights differences in spectral features
Abstract
During a 200 ks observation with the XMM-Newton Reflection Grating Spectrometer, we detected 16 type-I X-ray bursts from GS 1826-24. We combined the burst spectra in an attempt to measure the gravitational redshifts from the surface of the neutron star. We divided the composite GS 1826-24 burst spectrum into three groups based on the blackbody temperature during the bursts. The spectra do not show any obvious discrete absorption lines. We compare our observations with those of EXO 0748-676.
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