A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Fast X-ray/IR observations of the black hole transient Swift J1753.5-0127: From an IR lead to a very long jet lag
Tekijät: 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.
Kustantaja: EDP SCIENCES S A
Kustannuspaikka: LES ULIS CEDEX A
Julkaisuvuosi: 2024
Journal: Astronomy and Astrophysics
Tietokannassa oleva lehden nimi: ASTRONOMY & ASTROPHYSICS
Lehden akronyymi: ASTRON ASTROPHYS
Artikkelin numero: A239
Vuosikerta: 690
Sivujen määrä: 10
ISSN: 0004-6361
eISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/202450545
Verkko-osoite: https://doi.org/10.1051/0004-6361/202450545
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/458938640
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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Julkaisussa olevat rahoitustiedot:
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).
