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

Fast infrared variability from the black hole candidate MAXI J1535-571 and tight constraints on the modelling
Fast infrared variability from the black hole candidate MAXI J1535-571 and tight constraints on the modelling
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 (Ks band, 2.2 μm) and VLT/VISIR (M and PAH2_2 bands, 4.85 and 11.88 μm, respectively). The cross-correlation function between the X-ray and near-IR light curves shows a strong asymmetric anticorrelation dip at positive lags. We detect a near-IR QPO (2.5σ) at 2.07 ± 0.09 Hz simultaneously with an X-ray QPO at approximately the same frequency (f0 = 2.25 ± 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 time-scales. 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 the disc and jet.
0035-8711
614–624
Vincentelli, Federico
6059e516-6e7a-4d18-afa4-c5b68a3b207a
Casella, P.
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Russell, D.M.
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Baglio, M.C.
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Veledina, A.
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Maccarone, T.
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Malzac, J.
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Fender, R.
bf640676-511f-4d26-ae49-24f5a02aa2d8
O’Brien, K.
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Uttley, P.
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Vincentelli, Federico
6059e516-6e7a-4d18-afa4-c5b68a3b207a
Casella, P.
77e6a45d-e297-4201-8108-5005f5c9a325
Russell, D.M.
acbd3fbc-1e7f-41e8-8e2e-cf2534455763
Baglio, M.C.
8bdcd5f5-449c-4d35-8d19-01c13dd5d010
Veledina, A.
7627e2ab-2e31-4b69-97ed-b6fea4bd7d85
Maccarone, T.
e705df52-7bd6-45e0-a7dc-3af292eb1117
Malzac, J.
4efaf4ff-adb6-44d1-bd09-e7a7e4c956d8
Fender, R.
bf640676-511f-4d26-ae49-24f5a02aa2d8
O’Brien, K.
eb979bea-1272-40ec-b4c2-38899de4bcc4
Uttley, P.
2296cd13-f97d-4385-8e2a-405b3088f59a

Vincentelli, Federico, Casella, P., Russell, D.M., Baglio, M.C., Veledina, A., Maccarone, T., Malzac, J., Fender, R., O’Brien, K. and Uttley, P. (2021) Fast infrared variability from the black hole candidate MAXI J1535-571 and tight constraints on the modelling. Monthly Notices of the Royal Astronomical Society, 503 (1), 614–624. (doi:10.1093/mnras/stab475).

Record type: Article

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 (Ks band, 2.2 μm) and VLT/VISIR (M and PAH2_2 bands, 4.85 and 11.88 μm, respectively). The cross-correlation function between the X-ray and near-IR light curves shows a strong asymmetric anticorrelation dip at positive lags. We detect a near-IR QPO (2.5σ) at 2.07 ± 0.09 Hz simultaneously with an X-ray QPO at approximately the same frequency (f0 = 2.25 ± 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 time-scales. 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 the disc and jet.

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Fast infrared variability from the black hole candidate MAXI J1535-571 and tight constraints on the modelling - Accepted Manuscript
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Accepted/In Press date: 11 February 2021
e-pub ahead of print date: 19 February 2021
Additional Information: arxiv is am

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Local EPrints ID: 449643
URI: http://eprints.soton.ac.uk/id/eprint/449643
ISSN: 0035-8711
PURE UUID: c33df06f-0b0f-4a2e-accf-22872b154d39

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Date deposited: 10 Jun 2021 16:30
Last modified: 10 Jun 2021 16:30

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Contributors

Author: Federico Vincentelli
Author: P. Casella
Author: D.M. Russell
Author: M.C. Baglio
Author: A. Veledina
Author: T. Maccarone
Author: J. Malzac
Author: R. Fender
Author: K. O’Brien
Author: P. Uttley

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