Presentation #124.08 in the session Laboratory Astrophysics Division (LAD): iPosters.
In the modeling of X-ray reflection from accretion disk around black holes (BHs), it has been traditionally assumed that the density of the disk is constant and fixed at ne=1015 cm-3, a value appropriate for supermassive BHs. However, the disk density is expected to be much higher in disks around stellar-mass BHs, like those in black hole binary (BHB) systems. State-of-the-art reflection models are mostly adopting atomic codes designed for low density atmosphere, even if running in high density settings. In this poster, we discuss the effect of adding necessary high density corrections to the XILLVER reflection model, by updating the atomic calculation routines according to latest version of the XSTAR code. With synthetic spectra, we show that even in highly ionized state, high-density slabs can produce strong K-shell emission from iron (~6 keV), oxygen, nitrogen and silicon (≈0.8-1.2 keV). This is expected to significantly lower the super-solar iron abundances previously reported in several accreting BHs. We further discuss the implications of our findings and illustrate the power of the code by applying the generated tables to real source.