The generalized hardness-intensity diagram for black hole and neutron star X-ray binaries
arXiv:1909.08932 · doi:10.3847/1538-4357/ab4656
Abstract
Over the past half century, X-ray and radio observations of accreting neutron stars and stellar mass black holes have yielded a rich observational picture with common features including state transitions and jet formation, but also sharp differences. While black hole X-ray binaries overwhelmingly suppress jets in so-called soft states, accreting neutron stars are less restrictive, with a soft state wind observed in some sources to co-exist with a jet. We propose an explanation for these differences that leads to a generalization of a foundational element, the hardness-intensity diagram of Fender et al (2004). The inverse relation between jets and winds fits into a picture that connects to prograde accretion while the possibility of counterrotation between accretion disk and compact object accounts for observed differences in accreting neutron stars. This picture comes with a surprising twist, which is that neutron stars embody the small-scale analog of FRII quasars, an idea that allows us to complete the scale invariant picture for the jet-disk connection.
arXiv comment17 pages, 5 figures, Accepted for publication in the Astrophysical Journal
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