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Fast X-ray/IR observations of the black hole transient Swift J1753.5-0127: From an IR lead to a very long jet lag
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). University of Turku, Finland.ORCID-id: 0000-0002-5767-7253
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Antal upphovsmän: 192024 (Engelska)Ingår i: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 690, artikel-id A239Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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 (KS band, 2.2 μm) 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 ∼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 ≈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.

Ort, förlag, år, upplaga, sidor
2024. Vol. 690, artikel-id A239
Nyckelord [en]
Stars: activity, Stars: black holes, Stars: evolution, Stars: jets
Nationell ämneskategori
Astronomi, astrofysik och kosmologi
Identifikatorer
URN: urn:nbn:se:su:diva-237233DOI: 10.1051/0004-6361/202450545ISI: 001336832100001Scopus ID: 2-s2.0-85207801142OAI: oai:DiVA.org:su-237233DiVA, id: diva2:1925954
Tillgänglig från: 2025-01-09 Skapad: 2025-01-09 Senast uppdaterad: 2025-10-07Bibliografiskt granskad

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Veledina, Alexandra

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Nordiska institutet för teoretisk fysik (Nordita)
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Astronomy and Astrophysics
Astronomi, astrofysik och kosmologi

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