Fast X-ray/IR observations of the black hole transient Swift J1753.5-0127: From an IR lead to a very long jet lag - UTU Research Portal

A1 Refereed original research article in a scientific journal

Fast X-ray/IR observations of the black hole transient Swift J1753.5-0127: From an IR lead to a very long jet lag

Authors: Ulgiati, A.; Vincentelli, F. M.; Casella, P.; Veledina, A.; Maccarone, T. J.; Russell, D. M.; Uttley, P.; Ambrosino, F.; Baglio, M. C.; Imbrogno, M.; Melandri, A.; Motta, S. E.; O'Brien, K.; Sanna, A.; Shahbaz, T.; Altamirano, D.; Fender, R. P.; Maitra, D.; Malzac, J.

Publisher: EDP SCIENCES S A

Publishing place: LES ULIS CEDEX A

Publication year: 2024

Journal: Astronomy and Astrophysics

Journal name in source: ASTRONOMY & ASTROPHYSICS

Journal acronym: ASTRON ASTROPHYS

Article number: A239

Volume: 690

Number of pages: 10

ISSN: 0004-6361

eISSN: 1432-0746

DOI: https://doi.org/10.1051/0004-6361/202450545

Web address : https://doi.org/10.1051/0004-6361/202450545

Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/458938640

Abstract

We report two epochs of simultaneous near-infrared (IR) and X-ray observations of the low-mass X-ray binary black hole candidate Swift J1753.5-0127 with a subsecond time resolution during its long 2005-2016 outburst. Data were collected strictly simultaneously with VLT/ISAAC (K-S band, 2.2 mu m) and RXTE (2-15 keV) or XMM-Newton (0.7-10 keV). A clear correlation between the X-ray and the IR variable emission is found during both epochs but with very different properties. In the first epoch, the near-IR variability leads the X-ray by similar to 130 ms, which is the opposite of what is usually observed in similar systems. The correlation is more complex in the second epoch, with both anti-correlation and correlations at negative and positive lags. Frequency-resolved Fourier analysis allows us to identify two main components in the complex structure of the phase lags: the first component, characterised by a near-IR lag of a few seconds at low frequencies, is consistent with a combination of disc reprocessing and a magnetised hot flow; the second component is identified at high frequencies by a near-IR lag of approximate to 0.7 s. Given the similarities of this second component with the well-known constant optical/near-IR jet lag observed in other black hole transients, we tentatively interpret this feature as a signature of a longer-than-usual jet lag. We discuss the possible implications of measuring such a long jet lag in a radio-quiet black hole transient.

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Funding information in the publication:
FMV acknowledges support from the grant FJC2020-043334-I financed by MCIN/AEI/10.13039/501100011033 and Next Generation EU/PRTR, as well as from the grant PID2020-114822GB-I00. PC acknowledges financial support from the Italian Space Agency and National Institute for Astrophysics, ASI/INAF, under agreement ASI-INAF n.2017-14-H.0. AV acknowledges support from the Research Council of Finland grant 355672. Nordita is supported in part by NordForsk. MI is supported by the AASS Ph.D. joint research programme between the University of Rome “Sapienza” and the University of Rome “Tor Vergata”, with the collaboration of the National Institute of Astrophysics (INAF).