We present our analysis of MAXI J1813-095 during its hard state ``stalled'' outburst in 2018. This self-consistent analysis has been carried out using \NICER, \Swift, \Chandra, and {\NuSTAR} throughout seven observations of MAXI J1813-095. We find a relativistic iron line at ∼6.5 keV from the inner region of the accretion disk. Our results are consistent with a slightly truncated disk or non-truncated disk for an inner radius of ∼2Rg and minimum spin of >0.7 with a best value of ∼0.9, assuming Rin reaches the innermost stable circular orbit at Lx∼ 1\% LEdd. We analyzed MAXI J1813-095 over its outburst employing a spectral model which self-consistently couples the seed disk photons to the Comptonization and reflection components, also inclusive of reflection Comptonization. The unique aspect of this work is a reflection fraction of order unity, which is significantly higher than previous studies of this source, and is a consequence of applying the self-consistent disk-Comptonization-reflection spectral model. Other key parameters such as inclination and inner radius are found to be consistent with other works. works.
@article{arxiv.2409.13481,
title = {Self-Consistent Disk-Reflection Analysis of the Black-Hole Candidate X-ray Binary MAXI J1813-095 with NICER, Swift, Chandra, and NuSTAR},
author = {Santiago Ubach and James F. Steiner and Jiachen Jiang and Javier Garcia and Riley M. T. Connors and Guglielmo Mastroserio and Ye Feng and John A. Tomsick},
journal= {arXiv preprint arXiv:2409.13481},
year = {2024}
}