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Hard-state accretion disk winds from black holes: The revealing case of MAXI J1820+070

Hard-state accretion disk winds from black holes: The revealing case of MAXI J1820+070
Hard-state accretion disk winds from black holes: The revealing case of MAXI J1820+070

We report on a detailed optical spectroscopic follow-up of the black hole (BH) transient MAXI J1820+070 (ASASSN-18ey). The observations cover the main part of the X-ray binary outburst, when the source alternated between hard and soft states following the classical pattern widely seen in other systems. We focus the analysis on the He i emission lines at 5876 and 6678 as well as on Hα. We detect clear accretion disk wind features (P-Cyg profiles and broad emission line wings) in the hard state, both during outburst rise and decay. These are not witnessed during the several months long soft state. However, our data suggest that the visibility of the outflow might be significantly affected by the ionization state of the accretion disk. The terminal velocity of the wind is above ∼1200 km s-1, which is similar to outflow velocities derived from (hard-state) optical winds and (soft-state) X-ray winds in other systems. The wind signatures, in particular the P-Cyg profiles, are very shallow, and their detection has only been possible thanks to a combination of source brightness and intense monitoring at very high signal-to-noise. This study indicates that cold, optical winds are most likely a common feature of BH accretion, and therefore, that wind-like outflows are a general mechanism of mass and angular momentum removal operating throughout the entire X-ray binary outburst.

accretion, accretion disks, stars: black holes, stars: winds, outflows, X-rays: binaries
2041-8205
Muñoz-Darias, T.
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Jiménez-Ibarra, F.
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Panizo-Espinar, G.
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Casares, J
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Sánchez, D. Mata
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Ponti, G.
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Fender, R. P.
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Buckley, D. A.H.
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Garnavich, P.
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Torres, M. A.P.
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Padilla, M. Armas
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Charles, P. A.
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Corral-Santana, J. M.
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Kajava, J. J.E.
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Kotze, E. J.
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Littlefield, C.
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Sánchez-Sierras, J.
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Steeghs, D.
edbac7e0-525f-47af-9b1d-853b4b3d8477
Thomas, J.
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Muñoz-Darias, T.
3ce85aef-763c-4783-a13e-586115731bc2
Jiménez-Ibarra, F.
36575099-5a2b-4b8b-aa1d-52ac905eb538
Panizo-Espinar, G.
f30599f9-30db-4558-9ba7-f4a7d6eddedd
Casares, J
b36492e0-a175-4960-9634-3e64a01fc5ac
Sánchez, D. Mata
cf3bb445-e524-4792-8cea-fa8c0460d2d3
Ponti, G.
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Fender, R. P.
c802ddfc-25a3-4c0e-899d-11c405c705d1
Buckley, D. A.H.
c876368b-74ec-45d2-af15-09e8f9e8908f
Garnavich, P.
a46bc21c-8239-423a-b02c-9cfd267b1a09
Torres, M. A.P.
e7b42f8b-33a2-47bb-94b5-cad7d50a1177
Padilla, M. Armas
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Charles, P. A.
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Corral-Santana, J. M.
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Kajava, J. J.E.
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Kotze, E. J.
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Littlefield, C.
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Sánchez-Sierras, J.
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Steeghs, D.
edbac7e0-525f-47af-9b1d-853b4b3d8477
Thomas, J.
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Muñoz-Darias, T., Jiménez-Ibarra, F., Panizo-Espinar, G., Casares, J, Sánchez, D. Mata, Ponti, G., Fender, R. P., Buckley, D. A.H., Garnavich, P., Torres, M. A.P., Padilla, M. Armas, Charles, P. A., Corral-Santana, J. M., Kajava, J. J.E., Kotze, E. J., Littlefield, C., Sánchez-Sierras, J., Steeghs, D. and Thomas, J. (2019) Hard-state accretion disk winds from black holes: The revealing case of MAXI J1820+070. Astrophysical Journal Letters, 879 (1), [L4]. (doi:10.3847/2041-8213/ab2768).

Record type: Article

Abstract

We report on a detailed optical spectroscopic follow-up of the black hole (BH) transient MAXI J1820+070 (ASASSN-18ey). The observations cover the main part of the X-ray binary outburst, when the source alternated between hard and soft states following the classical pattern widely seen in other systems. We focus the analysis on the He i emission lines at 5876 and 6678 as well as on Hα. We detect clear accretion disk wind features (P-Cyg profiles and broad emission line wings) in the hard state, both during outburst rise and decay. These are not witnessed during the several months long soft state. However, our data suggest that the visibility of the outflow might be significantly affected by the ionization state of the accretion disk. The terminal velocity of the wind is above ∼1200 km s-1, which is similar to outflow velocities derived from (hard-state) optical winds and (soft-state) X-ray winds in other systems. The wind signatures, in particular the P-Cyg profiles, are very shallow, and their detection has only been possible thanks to a combination of source brightness and intense monitoring at very high signal-to-noise. This study indicates that cold, optical winds are most likely a common feature of BH accretion, and therefore, that wind-like outflows are a general mechanism of mass and angular momentum removal operating throughout the entire X-ray binary outburst.

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More information

Accepted/In Press date: 6 June 2019
e-pub ahead of print date: 28 June 2019
Published date: 1 July 2019
Keywords: accretion, accretion disks, stars: black holes, stars: winds, outflows, X-rays: binaries

Identifiers

Local EPrints ID: 433110
URI: http://eprints.soton.ac.uk/id/eprint/433110
ISSN: 2041-8205
PURE UUID: c6771fa3-c9bd-4725-91ff-1c48852fd716

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Date deposited: 08 Aug 2019 16:30
Last modified: 03 Feb 2021 17:38

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Contributors

Author: T. Muñoz-Darias
Author: F. Jiménez-Ibarra
Author: G. Panizo-Espinar
Author: J Casares
Author: D. Mata Sánchez
Author: G. Ponti
Author: R. P. Fender
Author: D. A.H. Buckley
Author: P. Garnavich
Author: M. A.P. Torres
Author: M. Armas Padilla
Author: P. A. Charles
Author: J. M. Corral-Santana
Author: J. J.E. Kajava
Author: E. J. Kotze
Author: C. Littlefield
Author: J. Sánchez-Sierras
Author: D. Steeghs
Author: J. Thomas

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