Explaining the ‘Outliers’ Track in Black Hole X-ray Binaries with a BZ-Jet and Inner-Disk Coupling

Abstract

In this paper, we investigate the black hole (BH) spin contribution to jet power, especially for the magnetic arrested disk (MAD), where only inner accretion disk luminosity is closely coupled with the spin-jet power, and try to explain the ‘outliers’ track of the radio LR to X-ray luminosity LX in two black hole X-ray binaries (BHXBs). Our results suggest that the BZ-jet and the inner-disk coupling could account for the ‘outliers’ track of the radio/X-ray correlation in two BHXBs, H1743-322 and MAXI J1348-630. Although the accretion disk of H1743-322 in the outburst could be in the MAD state, there is a lower probability that MAXI J1348-630 is in the MAD state due to its low jet production efficiency. The difference in the inner-disk bolometric luminosity ratio of the two sources implies that these two BHXBs are in different inner-disk accretion states. We further investigate the phase-changing regime of MAXI J1348-630 and find that there is a phase transition around LX/LEdd∼10−3. The assumption of sub-MAD is discussed as well.

X-ray Spectroscopic Study of Low-Mass X-ray Binaries: A Review of Recent Progress via the Example of GX 339-4

“…Another component that is missing in this classical picture is the collimated jet [17], which can be a significant source of the X-ray emission in the hard state, and it is shown to dominate the X-ray emission in the quiescent state [18]. Recent studies showed that the jet contribution itself depends on the BH spin [19]. Reproduced with permission from Ramesh Narayan and ApJ.…”

“…The 𝜒 values for the kerrbb fit turned out to be 𝜒 /dof = 2. 19 Apart from the difficulty fitting the spectrum using these models, there seems to be an inconsistency between the BH spin values obtained from the continuum fit and the iron-line fit. Since neither the mass, nor the distance were precisely known at the time, changing these values somewhat in the kerrbb model (13.5 Mʘ and 7.5 kpc) resulted in BH spin values 0.93 and 0.96 for the 2002 and 2003 datasets, respectively.…”