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Fast infrared variability from a relativistic jet in GX 339?4

Fast infrared variability from a relativistic jet in GX 339?4
Fast infrared variability from a relativistic jet in GX 339?4
We present the discovery of fast infrared/X-ray correlated variability in the black hole transient GX 339? 4. The source was observed with subsecond time resolution simultaneously with Very Large Telescope/Infrared Spectrometer And Array Camera and Rossi X-ray Timing Explorer/Proportional Counter Array in 2008 August, during its persistent low-flux highly variable hard state. The data show a strong correlated variability, with the infrared emission lagging the X-ray emission by 100 ms. The short time delay and the nearly symmetric cross-correlation function, together with the measured brightness temperature of ?2.5 × 106 K, indicate that the bright and highly variable infrared emission most likely comes from a jet near the black hole. Under standard assumptions about jet physics, the measured time delay can provide us a lower limit of ? > 2 for the Lorentz factor of the jet. This suggests that jets from stellar-mass black holes are at least mildly relativistic near their launching region. We discuss implications for future applications of this technique.
black hole physics, stars: winds, outflows, x-rays: binaries, x-rays: individual: GX 339?4
1745-3933
L21-L25
Casella, P.
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Maccarone, T.J.
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O'Brien, K.
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Fender, R.P.
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Russell, D.M.
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van der Klis, M.
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Pe'er, A.
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Maitra, D.
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Altamirano, D.
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Belloni, T.
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Kanbach, G.
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Klein-Wolt, M.
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Mason, E.
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Soleri, P.
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Stefanescu, A.
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Wiersema, K.
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Wijnands, R.
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Casella, P.
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Maccarone, T.J.
5d8ee27f-a174-424c-b3b7-a6739bfeea50
O'Brien, K.
4d547bb8-df0e-442d-92b1-53bdce7d046b
Fender, R.P.
c802ddfc-25a3-4c0e-899d-11c405c705d1
Russell, D.M.
834b7d6a-da49-482f-adbd-031e10620667
van der Klis, M.
d3635ef2-91fc-4d3a-b453-ac2861a9edb3
Pe'er, A.
14560f4b-cc32-46fc-954b-faface7fc2f1
Maitra, D.
a3bcc99c-d14c-44ff-80ff-1d4ef1f37415
Altamirano, D.
1d7e88fe-c948-451c-90fb-f9d5f7308195
Belloni, T.
a6a0a7f0-68d9-411a-97ee-75479ce1aeac
Kanbach, G.
68818ac4-f0eb-4fe8-a99d-ae15f95bb287
Klein-Wolt, M.
444e6ce3-0ce6-432a-9504-33526a15d49a
Mason, E.
fc4644d3-13af-477c-ba04-8288aa7e20a5
Soleri, P.
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Stefanescu, A.
f5a80549-d0e9-46e3-823f-584360d284b5
Wiersema, K.
050aa7fc-adab-45da-a63d-d03b497988db
Wijnands, R.
382893ee-0e03-45e3-9321-db8b9fc74914

Casella, P., Maccarone, T.J., O'Brien, K., Fender, R.P., Russell, D.M., van der Klis, M., Pe'er, A., Maitra, D., Altamirano, D., Belloni, T., Kanbach, G., Klein-Wolt, M., Mason, E., Soleri, P., Stefanescu, A., Wiersema, K. and Wijnands, R. (2010) Fast infrared variability from a relativistic jet in GX 339?4. Monthly Notices of the Royal Astronomical Society: Letters, 404 (1), L21-L25. (doi:10.1111/j.1745-3933.2010.00826.x).

Record type: Article

Abstract

We present the discovery of fast infrared/X-ray correlated variability in the black hole transient GX 339? 4. The source was observed with subsecond time resolution simultaneously with Very Large Telescope/Infrared Spectrometer And Array Camera and Rossi X-ray Timing Explorer/Proportional Counter Array in 2008 August, during its persistent low-flux highly variable hard state. The data show a strong correlated variability, with the infrared emission lagging the X-ray emission by 100 ms. The short time delay and the nearly symmetric cross-correlation function, together with the measured brightness temperature of ?2.5 × 106 K, indicate that the bright and highly variable infrared emission most likely comes from a jet near the black hole. Under standard assumptions about jet physics, the measured time delay can provide us a lower limit of ? > 2 for the Lorentz factor of the jet. This suggests that jets from stellar-mass black holes are at least mildly relativistic near their launching region. We discuss implications for future applications of this technique.

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Published date: May 2010
Keywords: black hole physics, stars: winds, outflows, x-rays: binaries, x-rays: individual: GX 339?4

Identifiers

Local EPrints ID: 147233
URI: https://eprints.soton.ac.uk/id/eprint/147233
ISSN: 1745-3933
PURE UUID: 9cdd003b-9f66-4984-bdd0-5c9196cd2fc1

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Date deposited: 28 May 2010 08:57
Last modified: 18 Jul 2017 23:03

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Contributors

Author: P. Casella
Author: T.J. Maccarone
Author: K. O'Brien
Author: R.P. Fender
Author: D.M. Russell
Author: M. van der Klis
Author: A. Pe'er
Author: D. Maitra
Author: D. Altamirano
Author: T. Belloni
Author: G. Kanbach
Author: M. Klein-Wolt
Author: E. Mason
Author: P. Soleri
Author: A. Stefanescu
Author: K. Wiersema
Author: R. Wijnands

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