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A NICER discovery of a low-frequency quasi-periodic oscillation in the soft-intermediate state of MAXI J1535-571

A NICER discovery of a low-frequency quasi-periodic oscillation in the soft-intermediate state of MAXI J1535-571
A NICER discovery of a low-frequency quasi-periodic oscillation in the soft-intermediate state of MAXI J1535-571

We present the discovery of a low-frequency ≈5.7 Hz quasi-periodic oscillation (QPO) feature in observations of the black hole X-ray binary MAXI J1535-571 in its soft-intermediate state, obtained in 2017 September-October by the Neutron Star Interior Composition Explorer. The feature is relatively broad (compared to other low-frequency QPOs; quality factor Q ≈ 2) and weak (1.9% rms in 3-10 keV), and is accompanied by a weak harmonic and low-amplitude broadband noise. These characteristics identify it as a weak Type A/B QPO, similar to ones previously identified in the soft-intermediate state of the transient black hole X-ray binary XTE J1550-564. The lag-energy spectrum of the QPO shows increasing soft lags toward lower energies, approaching 50 ms at 1 keV (with respect to a 3-10 keV continuum). This large phase shift has similar amplitude but opposite sign to that seen in Rossi X-Ray Timing Explorer data for a Type B QPO from the transient black hole X-ray binary GX 339-4. Previous phase-resolved spectroscopy analysis of the Type B QPO in GX 339-4 pointed toward a precessing jet-like corona illuminating the accretion disk as the origin of the QPO signal. We suggest that this QPO in MAXI J1535-571 may have the same origin, with the different lag sign depending on the scale height of the emitting region and the observer inclination angle.

accretion, accretion disks, black hole physics, stars: black holes, X-rays: binaries, X-rays: individual (MAXI J1535)
2041-8205
Stevens, A. L.
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Uttley, P.
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Altamirano, D.
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Arzoumanian, Z.
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Bult, P.
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Cackett, E. M.
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Fabian, A. C.
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Gendreau, K. C.
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Ha, K. Q.
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Homan, J.
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Ingram, A. R.
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Kara, E.
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Kellogg, J.
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Ludlam, R. M.
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Miller, J. M.
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Neilsen, J.
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Pasham, D. R.
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Remillard, R. A.
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Steiner, J. F.
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Eijnden, J. Van Den
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Stevens, A. L.
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Uttley, P.
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Altamirano, D.
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Arzoumanian, Z.
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Bult, P.
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Cackett, E. M.
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Fabian, A. C.
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Gendreau, K. C.
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Ha, K. Q.
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Homan, J.
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Ingram, A. R.
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Kara, E.
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Kellogg, J.
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Ludlam, R. M.
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Miller, J. M.
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Neilsen, J.
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Pasham, D. R.
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Remillard, R. A.
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Steiner, J. F.
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Eijnden, J. Van Den
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Stevens, A. L., Uttley, P., Altamirano, D., Arzoumanian, Z., Bult, P., Cackett, E. M., Fabian, A. C., Gendreau, K. C., Ha, K. Q., Homan, J., Ingram, A. R., Kara, E., Kellogg, J., Ludlam, R. M., Miller, J. M., Neilsen, J., Pasham, D. R., Remillard, R. A., Steiner, J. F. and Eijnden, J. Van Den (2018) A NICER discovery of a low-frequency quasi-periodic oscillation in the soft-intermediate state of MAXI J1535-571. Astrophysical Journal Letters, 865 (2), [L15]. (doi:10.3847/2041-8213/aae1a4).

Record type: Article

Abstract

We present the discovery of a low-frequency ≈5.7 Hz quasi-periodic oscillation (QPO) feature in observations of the black hole X-ray binary MAXI J1535-571 in its soft-intermediate state, obtained in 2017 September-October by the Neutron Star Interior Composition Explorer. The feature is relatively broad (compared to other low-frequency QPOs; quality factor Q ≈ 2) and weak (1.9% rms in 3-10 keV), and is accompanied by a weak harmonic and low-amplitude broadband noise. These characteristics identify it as a weak Type A/B QPO, similar to ones previously identified in the soft-intermediate state of the transient black hole X-ray binary XTE J1550-564. The lag-energy spectrum of the QPO shows increasing soft lags toward lower energies, approaching 50 ms at 1 keV (with respect to a 3-10 keV continuum). This large phase shift has similar amplitude but opposite sign to that seen in Rossi X-Ray Timing Explorer data for a Type B QPO from the transient black hole X-ray binary GX 339-4. Previous phase-resolved spectroscopy analysis of the Type B QPO in GX 339-4 pointed toward a precessing jet-like corona illuminating the accretion disk as the origin of the QPO signal. We suggest that this QPO in MAXI J1535-571 may have the same origin, with the different lag sign depending on the scale height of the emitting region and the observer inclination angle.

Text
A NICER Discovery of a Low-frequency Quasi-periodic Oscillation in the Soft-intermediate State of MAXI J1535-571 - Accepted Manuscript
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Accepted/In Press date: 14 September 2018
e-pub ahead of print date: 26 September 2018
Published date: 1 October 2018
Keywords: accretion, accretion disks, black hole physics, stars: black holes, X-rays: binaries, X-rays: individual (MAXI J1535)

Identifiers

Local EPrints ID: 425558
URI: http://eprints.soton.ac.uk/id/eprint/425558
ISSN: 2041-8205
PURE UUID: 4b55d3eb-3178-4f67-a511-d331c60a1511
ORCID for D. Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 24 Oct 2018 16:30
Last modified: 07 Oct 2020 04:48

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Contributors

Author: A. L. Stevens
Author: P. Uttley
Author: D. Altamirano ORCID iD
Author: Z. Arzoumanian
Author: P. Bult
Author: E. M. Cackett
Author: A. C. Fabian
Author: K. C. Gendreau
Author: K. Q. Ha
Author: J. Homan
Author: A. R. Ingram
Author: E. Kara
Author: J. Kellogg
Author: R. M. Ludlam
Author: J. M. Miller
Author: J. Neilsen
Author: D. R. Pasham
Author: R. A. Remillard
Author: J. F. Steiner
Author: J. Van Den Eijnden

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