Fast infrared variability from the black-hole candidate MAXI J1535$-$571 and tight constraints on the modelling

Abstract

We present the results regarding the analysis of the fast X-ray/infrared (IR) variability of the black-hole transient MAXI J1535$-$571. The data studied in this work consist of two strictly simultaneous observations performed with XMM-Newton (X-rays: 0.7$-$10 keV), VLT/HAWK-I ($K_{\mathrm{s}}$ band, 2.2 $\mu$m) and VLT/VISIR ($M$ and $PAH2$_$2$ bands, 4.85 and 11.88 $\mu$m respectively). The cross-correlation function between the X-ray and near-IR light curves shows a strong asymmetric anti-correlation dip at positive lags. We detect a near-IR QPO (2.5 $\sigma$) at $2.07\pm 0.09$ Hz simultaneously with an X-ray QPO at approximately the same frequency ($f_0=2.25\pm 0.05$). From the cross-spectral analysis a lag consistent with zero was measured between the two oscillations. We also measure a significant correlation between the average near-IR and mid-IR fluxes during the second night, but find no correlation on short timescales. We discuss these results in terms of the two main scenarios for fast IR variability (hot inflow and jet powered by internal shocks). In both cases, our preliminary modelling suggests the presence of a misalignment between disk and jet.

12 pages, 7 figures. Accepted for publication in MNRAS

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Cited by in corpus (11)

• The Evolution of Rapid Optical/X-ray Timing Correlations in the Initial Hard State of MAXI J1820+070
• Are Low-Frequency Quasi-Periodic Oscillations seen in accretion flows the disk response to a jet instability?
• Wavelet analysis of MAXI J1535-571 with Insight-HXMT
• Black holes: Timing and spectral properties and evolution
• Wavelet analysis of the transient QPOs in MAXI J1535$-$571 with Insight-HXMT
• Fast X-ray/IR observations of the black hole transient Swift~J1753.5--0127: from an IR lead to a very long jet lag
• The Accretion-Ejection Connection in the Black Hole X-ray Binary MAXI J1820$+$070
• Tracking optical variability and outflows across the accretion states of the black hole transient MAXI J1820+070
• The simultaneity of emission from approaching and receding jets
• Optical and X-ray timing analysis of the 2018-2020 outburst and rebrightening of the black-hole transient MAXI J1820+070
• Rapid far-infrared spectral timing of X-ray binaries with PRIMA