A Multi-instrument Study of the 2018 Hard-state-only Outburst of H1743-322

Distinct changes of the spectral and variability properties observed in black hole transients during a bright outburst deliver insight into evolution accretion flow geometry. We investigated NICER Swift monitoring observations H 1743–322 its 2018 as well NuSTAR XMM-Newton data. The hardness ratios, rms amplitudes, quasiperiodic oscillations indicate that showed another hard-state-only, or so-called "failed", outburst. energy spectra obtained from data confirm hard-state nature give photon indices ∼1.7, typically found hard state 1743–322. allow us to follow covariance ratios hard-state-only for first time. presence flat at low energies is established early find this shape maintained throughout