NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430

Matteo Bachetti; Hiromasa Miyasaka; Fiona Harrison; Felix Fürst; Didier Barret; Eric C. Bellm; Steven E. Boggs; Deepto Chakrabarty; Jérôme Chenevez; Finn Erland Christensen; William W. Craig; Brian W. Grefenstette; Charles J. Hailey; Kristin K. Madsen; Lorenzo Natalucci; Katja Pottschmidt; Daniel Stern; John A. Tomsick; Dominic J. Walton; Jörn Wilms; William Zhang

doi:10.1051/epjconf/20136406011

NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430

Matteo Bachetti, Hiromasa Miyasaka, Fiona Harrison, Felix Fürst, Didier Barret, Eric C. Bellm, Steven E. Boggs, Deepto Chakrabarty, Jérôme Chenevez, Finn Erland Christensen, William W. Craig, Brian W. Grefenstette, Charles J. Hailey, Kristin K. Madsen, Lorenzo Natalucci, Katja Pottschmidt, Daniel Stern, John A. Tomsick, Dominic J. Walton, Jörn WilmsWilliam Zhang

Research output: Contribution to journal › Conference article › Research › peer-review

410 Downloads (Pure)

Abstract

The NuSTAR hard X-ray telescope observed the transient Be/X-ray binary GS 0834􀀀430 during its 2012 outburst. The source is detected between 3 – 79 keV with high statistical significance, and we were able to perform very accurate spectral and timing analysis. The phase-averaged spectrum is consistent with that observed in many other magnetized accreting pulsars. We fail to detect cyclotron resonance scattering features in either phase-averaged nor phase-resolved spectra that would allow us to constrain the pulsar’s magnetic field. We detect a pulse period of ∼ 12.29 s in all energy bands. The pulse profile can be modeled with a double Gaussian and shows a strong and smooth hard lag of up to 0.3 cycles in phase, or about 4s between the pulse at ∼ 3 and >∼ 30 keV. This is the first report of such a strong lag in high-mass X-ray binary (HMXB) pulsars. Previously reported lags have been significantly smaller in phase and restricted to low-energies (E<10 keV). We investigate the possible mechanisms that might produce such lags. We find the most likely explanation for this eect to be a complex beam geometry.

Original language	English
Article number	06011
Journal	E P J Web of Conferences
Volume	64
Number of pages	4
ISSN	2100-014X
DOIs	https://doi.org/10.1051/epjconf/20136406011
Publication status	Published - 2014
Event	2013 International Conference on Physics at the Magnetospheric Boundary - Geneva, Switzerland Duration: 25 Jun 2013 → 28 Jun 2013

Conference

Conference	2013 International Conference on Physics at the Magnetospheric Boundary
Country/Territory	Switzerland
City	Geneva
Period	25/06/2013 → 28/06/2013

Bibliographical note

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Access to Document

10.1051/epjconf/20136406011

NuSTAR detectionFinal published version, 793 KB

http://www.epj-conferences.org/articles/epjconf/abs/2014/01/epjconf_mag2013_06011/epjconf_mag2013_06011.html

OpenUrl availability

Full text

Cite this

Bachetti, M., Miyasaka, H., Harrison, F., Fürst, F., Barret, D., Bellm, E. C., Boggs, S. E., Chakrabarty, D., Chenevez, J., Christensen, F. E., Craig, W. W., Grefenstette, B. W., Hailey, C. J., Madsen, K. K., Natalucci, L., Pottschmidt, K., Stern, D., Tomsick, J. A., Walton, D. J., ... Zhang, W. (2014). NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430. E P J Web of Conferences, 64, Article 06011. https://doi.org/10.1051/epjconf/20136406011

@inproceedings{a09dd64729214560a36114153d2784b4,

title = "NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430",

abstract = "The NuSTAR hard X-ray telescope observed the transient Be/X-ray binary GS 0834􀀀430 during its 2012 outburst. The source is detected between 3 – 79 keV with high statistical significance, and we were able to perform very accurate spectral and timing analysis. The phase-averaged spectrum is consistent with that observed in many other magnetized accreting pulsars. We fail to detect cyclotron resonance scattering features in either phase-averaged nor phase-resolved spectra that would allow us to constrain the pulsar{\textquoteright}s magnetic field. We detect a pulse period of ∼ 12.29 s in all energy bands. The pulse profile can be modeled with a double Gaussian and shows a strong and smooth hard lag of up to 0.3 cycles in phase, or about 4s between the pulse at ∼ 3 and >∼ 30 keV. This is the first report of such a strong lag in high-mass X-ray binary (HMXB) pulsars. Previously reported lags have been significantly smaller in phase and restricted to low-energies (E<10 keV). We investigate the possible mechanisms that might produce such lags. We find the most likely explanation for this eect to be a complex beam geometry.",

author = "Matteo Bachetti and Hiromasa Miyasaka and Fiona Harrison and Felix F{\"u}rst and Didier Barret and Bellm, {Eric C.} and Boggs, {Steven E.} and Deepto Chakrabarty and J{\'e}r{\^o}me Chenevez and Christensen, {Finn Erland} and Craig, {William W.} and Grefenstette, {Brian W.} and Hailey, {Charles J.} and Madsen, {Kristin K.} and Lorenzo Natalucci and Katja Pottschmidt and Daniel Stern and Tomsick, {John A.} and Walton, {Dominic J.} and J{\"o}rn Wilms and William Zhang",

note = "This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.; 2013 International Conference on Physics at the Magnetospheric Boundary ; Conference date: 25-06-2013 Through 28-06-2013",

year = "2014",

doi = "10.1051/epjconf/20136406011",

language = "English",

volume = "64",

journal = "E P J Web of Conferences",

issn = "2100-014X",

publisher = "E D P Sciences",

}

Bachetti, M, Miyasaka, H, Harrison, F, Fürst, F, Barret, D, Bellm, EC, Boggs, SE, Chakrabarty, D, Chenevez, J , Christensen, FE, Craig, WW, Grefenstette, BW, Hailey, CJ, Madsen, KK, Natalucci, L, Pottschmidt, K, Stern, D, Tomsick, JA, Walton, DJ, Wilms, J & Zhang, W 2014, 'NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430', E P J Web of Conferences, vol. 64, 06011. https://doi.org/10.1051/epjconf/20136406011

TY - GEN

T1 - NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430

AU - Bachetti, Matteo

AU - Miyasaka, Hiromasa

AU - Harrison, Fiona

AU - Fürst, Felix

AU - Barret, Didier

AU - Bellm, Eric C.

AU - Boggs, Steven E.

AU - Chakrabarty, Deepto

AU - Chenevez, Jérôme

AU - Christensen, Finn Erland

AU - Craig, William W.

AU - Grefenstette, Brian W.

AU - Hailey, Charles J.

AU - Madsen, Kristin K.

AU - Natalucci, Lorenzo

AU - Pottschmidt, Katja

AU - Stern, Daniel

AU - Tomsick, John A.

AU - Walton, Dominic J.

AU - Wilms, Jörn

AU - Zhang, William

N1 - This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

PY - 2014

Y1 - 2014

N2 - The NuSTAR hard X-ray telescope observed the transient Be/X-ray binary GS 0834􀀀430 during its 2012 outburst. The source is detected between 3 – 79 keV with high statistical significance, and we were able to perform very accurate spectral and timing analysis. The phase-averaged spectrum is consistent with that observed in many other magnetized accreting pulsars. We fail to detect cyclotron resonance scattering features in either phase-averaged nor phase-resolved spectra that would allow us to constrain the pulsar’s magnetic field. We detect a pulse period of ∼ 12.29 s in all energy bands. The pulse profile can be modeled with a double Gaussian and shows a strong and smooth hard lag of up to 0.3 cycles in phase, or about 4s between the pulse at ∼ 3 and >∼ 30 keV. This is the first report of such a strong lag in high-mass X-ray binary (HMXB) pulsars. Previously reported lags have been significantly smaller in phase and restricted to low-energies (E<10 keV). We investigate the possible mechanisms that might produce such lags. We find the most likely explanation for this eect to be a complex beam geometry.

AB - The NuSTAR hard X-ray telescope observed the transient Be/X-ray binary GS 0834􀀀430 during its 2012 outburst. The source is detected between 3 – 79 keV with high statistical significance, and we were able to perform very accurate spectral and timing analysis. The phase-averaged spectrum is consistent with that observed in many other magnetized accreting pulsars. We fail to detect cyclotron resonance scattering features in either phase-averaged nor phase-resolved spectra that would allow us to constrain the pulsar’s magnetic field. We detect a pulse period of ∼ 12.29 s in all energy bands. The pulse profile can be modeled with a double Gaussian and shows a strong and smooth hard lag of up to 0.3 cycles in phase, or about 4s between the pulse at ∼ 3 and >∼ 30 keV. This is the first report of such a strong lag in high-mass X-ray binary (HMXB) pulsars. Previously reported lags have been significantly smaller in phase and restricted to low-energies (E<10 keV). We investigate the possible mechanisms that might produce such lags. We find the most likely explanation for this eect to be a complex beam geometry.

U2 - 10.1051/epjconf/20136406011

DO - 10.1051/epjconf/20136406011

M3 - Conference article

SN - 2100-014X

VL - 64

JO - E P J Web of Conferences

JF - E P J Web of Conferences

M1 - 06011

T2 - 2013 International Conference on Physics at the Magnetospheric Boundary

Y2 - 25 June 2013 through 28 June 2013

ER -

NuSTAR detection of 4s Hard X-ray Lags from the Accreting Pulsar GS 0834-430

Abstract

Conference

Bibliographical note

Access to Document

OpenUrl availability

Fingerprint

Cite this