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The high-energy emission from HD 93129A near periastron

The high-energy emission from HD 93129A near periastron
The high-energy emission from HD 93129A near periastron
We conducted an observational campaign towards one of the most massive and luminous colliding wind binaries in the Galaxy, HD 93129A, close to its periastron passage in 2018. During this time the source was predicted to be in its maximum of high-energy emission. Here we present our data analysis from the X-ray satellites Chandra and NuSTAR and the γ-ray satellite AGILE. High-energy emission coincident with HD 93129A was detected in the X-ray band up to ∼18 keV, whereas in the γ-ray band only upper limits were obtained. We interpret the derived fluxes using a non-thermal radiative model for the wind-collision region. We establish a conservative upper limit for the fraction of the wind kinetic power that is converted into relativistic electron acceleration, fNT,e < 0.02. In addition, we set a lower limit for the magnetic field in the wind-collision region as BWCR > 0.3 G. We also argue a putative interpretation of the emission from which we estimate fNT,e ≈ 0.006 and BWCR ≈ 0.5 G. We conclude that multiwavelength, dedicated observing campaigns during carefully selected epochs are a powerful tool for characterizing the relativistic particle content and magnetic field intensity in colliding wind binaries.
X-rays: stars, acceleration of particles, gamma-rays: stars, radiation mechanisms: non-thermal
0035-8711
6043-6052
Del palacio, S.
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García, F.
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Altamirano, D.
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Barbá, R.H.
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Bosch-Ramon, V.
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Corcoran, M.
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De Becker, M.
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Hamaguchi, K.
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Maíz Apellániz, J.
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Munar Adrover, P.
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Paredes, J.M.
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Romero, G.E.
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Sana, H.
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Tavani, M.
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ud-Doula, A.
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Del palacio, S.
53448afe-792b-4970-b8a4-14d21d439e0d
García, F.
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Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b
Barbá, R.H.
7ab44347-5ac3-4ab2-a9b4-c2ae2b66c888
Bosch-Ramon, V.
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Corcoran, M.
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De Becker, M.
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Hamaguchi, K.
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Maíz Apellániz, J.
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Munar Adrover, P.
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Paredes, J.M.
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Romero, G.E.
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Sana, H.
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Tavani, M.
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ud-Doula, A.
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Del palacio, S., García, F., Altamirano, D., Barbá, R.H., Bosch-Ramon, V., Corcoran, M., De Becker, M., Hamaguchi, K., Maíz Apellániz, J., Munar Adrover, P., Paredes, J.M., Romero, G.E., Sana, H., Tavani, M. and ud-Doula, A. (2020) The high-energy emission from HD 93129A near periastron. Monthly Notices of the Royal Astronomical Society, 494 (4), 6043-6052. (doi:10.1093/mnras/staa1156).

Record type: Article

Abstract

We conducted an observational campaign towards one of the most massive and luminous colliding wind binaries in the Galaxy, HD 93129A, close to its periastron passage in 2018. During this time the source was predicted to be in its maximum of high-energy emission. Here we present our data analysis from the X-ray satellites Chandra and NuSTAR and the γ-ray satellite AGILE. High-energy emission coincident with HD 93129A was detected in the X-ray band up to ∼18 keV, whereas in the γ-ray band only upper limits were obtained. We interpret the derived fluxes using a non-thermal radiative model for the wind-collision region. We establish a conservative upper limit for the fraction of the wind kinetic power that is converted into relativistic electron acceleration, fNT,e < 0.02. In addition, we set a lower limit for the magnetic field in the wind-collision region as BWCR > 0.3 G. We also argue a putative interpretation of the emission from which we estimate fNT,e ≈ 0.006 and BWCR ≈ 0.5 G. We conclude that multiwavelength, dedicated observing campaigns during carefully selected epochs are a powerful tool for characterizing the relativistic particle content and magnetic field intensity in colliding wind binaries.

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2004.10032 - Accepted Manuscript
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Accepted/In Press date: 18 April 2020
e-pub ahead of print date: 5 May 2020
Published date: June 2020
Keywords: X-rays: stars, acceleration of particles, gamma-rays: stars, radiation mechanisms: non-thermal

Identifiers

Local EPrints ID: 442159
URI: http://eprints.soton.ac.uk/id/eprint/442159
ISSN: 0035-8711
PURE UUID: c3f229b1-6d5c-48bb-b0f9-d37b602789dd
ORCID for D. Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 07 Jul 2020 16:55
Last modified: 26 Nov 2021 03:02

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Contributors

Author: S. Del palacio
Author: F. García
Author: D. Altamirano ORCID iD
Author: R.H. Barbá
Author: V. Bosch-Ramon
Author: M. Corcoran
Author: M. De Becker
Author: K. Hamaguchi
Author: J. Maíz Apellániz
Author: P. Munar Adrover
Author: J.M. Paredes
Author: G.E. Romero
Author: H. Sana
Author: M. Tavani
Author: A. ud-Doula

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