Phase-resolved NuSTAR and SWIFT-XRT observations of magnetar 4U 0142+61

Shriharsh P. Tendulkar; Romain Hascöet; Chengwei Yang; Victoria M. Kaspi; Andrei M. Beloborodov; Hongjun An; Matteo Bachetti; Steven E. Boggs; Finn Erland Christensen; William W. Craig; Sebastien Guiilot; Charles A. Hailey; Fiona A. Harrison; Daniel Stern; William Zhang

doi:10.1088/0004-637X/808/1/32

Phase-resolved NuSTAR and SWIFT-XRT observations of magnetar 4U 0142+61

Shriharsh P. Tendulkar, Romain Hascöet, Chengwei Yang, Victoria M. Kaspi, Andrei M. Beloborodov, Hongjun An, Matteo Bachetti, Steven E. Boggs, Finn Erland Christensen, William W. Craig, Sebastien Guiilot, Charles A. Hailey, Fiona A. Harrison, Daniel Stern, William Zhang

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Abstract

We present temporal and spectral analysis of simultaneous 0.5-79 keV Swift-XRT and Nuclear Spectroscopic Telescope Array observations of the magnetar 4U 0142+61. The pulse profile changes significantly with photon energy between 3 and 35 keV. The pulse fraction increases with energy, reaching a value of ≈20%, similar to that observed in 1E 1841-045 and much lower than the ≈80% pulse fraction observed in 1E 2259+586. We do not detect the 55 ks phase modulation reported in previous Suzaku-HXD observations. The phase-averaged spectrum of 4U 0142+61 above 20 keV is dominated by a hard power law (PL) with a photon index ΓH ~ 0.65, and the spectrum below 20 keV can be described by two blackbodies, a blackbody plus a soft PL, or by a Comptonized blackbody model. We study the full phase-resolved spectra using the e± outflow model of Beloborodov. Our results are consistent with the parameters of the active j-bundle derived from INTEGRAL data by Hascoe¨t et al. We find that a significant degeneracy appears in the inferred parameters if the footprint of the j-bundle is allowed to be a thin ring instead of a polar cap. The degeneracy is reduced when the footprint is required to be the hot spot inferred from the soft X-ray data.

Original language	English
Journal	Astrophysical Journal
Volume	808
Issue number	1
Pages (from-to)	1-13
Number of pages	13
ISSN	0004-637X
DOIs	https://doi.org/10.1088/0004-637X/808/1/32
Publication status	Published - 2015

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Tendulkar, S. P., Hascöet, R., Yang, C., Kaspi, V. M., Beloborodov, A. M., An, H., Bachetti, M., Boggs, S. E., Christensen, F. E., Craig, W. W., Guiilot, S., Hailey, C. A., Harrison, F. A., Stern, D., & Zhang, W. (2015). Phase-resolved NuSTAR and SWIFT-XRT observations of magnetar 4U 0142+61. Astrophysical Journal, 808(1), 1-13. https://doi.org/10.1088/0004-637X/808/1/32

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title = "Phase-resolved NuSTAR and SWIFT-XRT observations of magnetar 4U 0142+61",

abstract = "We present temporal and spectral analysis of simultaneous 0.5-79 keV Swift-XRT and Nuclear Spectroscopic Telescope Array observations of the magnetar 4U 0142+61. The pulse profile changes significantly with photon energy between 3 and 35 keV. The pulse fraction increases with energy, reaching a value of ≈20%, similar to that observed in 1E 1841-045 and much lower than the ≈80% pulse fraction observed in 1E 2259+586. We do not detect the 55 ks phase modulation reported in previous Suzaku-HXD observations. The phase-averaged spectrum of 4U 0142+61 above 20 keV is dominated by a hard power law (PL) with a photon index ΓH ~ 0.65, and the spectrum below 20 keV can be described by two blackbodies, a blackbody plus a soft PL, or by a Comptonized blackbody model. We study the full phase-resolved spectra using the e± outflow model of Beloborodov. Our results are consistent with the parameters of the active j-bundle derived from INTEGRAL data by Hascoe¨t et al. We find that a significant degeneracy appears in the inferred parameters if the footprint of the j-bundle is allowed to be a thin ring instead of a polar cap. The degeneracy is reduced when the footprint is required to be the hot spot inferred from the soft X-ray data.",

author = "Tendulkar, {Shriharsh P.} and Romain Hasc{\"o}et and Chengwei Yang and Kaspi, {Victoria M.} and Beloborodov, {Andrei M.} and Hongjun An and Matteo Bachetti and Boggs, {Steven E.} and Christensen, {Finn Erland} and Craig, {William W.} and Sebastien Guiilot and Hailey, {Charles A.} and Harrison, {Fiona A.} and Daniel Stern and William Zhang",

year = "2015",

doi = "10.1088/0004-637X/808/1/32",

language = "English",

volume = "808",

pages = "1--13",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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TY - JOUR

T1 - Phase-resolved NuSTAR and SWIFT-XRT observations of magnetar 4U 0142+61

AU - Tendulkar, Shriharsh P.

AU - Hascöet, Romain

AU - Yang, Chengwei

AU - Kaspi, Victoria M.

AU - Beloborodov, Andrei M.

AU - An, Hongjun

AU - Bachetti, Matteo

AU - Boggs, Steven E.

AU - Christensen, Finn Erland

AU - Craig, William W.

AU - Guiilot, Sebastien

AU - Hailey, Charles A.

AU - Harrison, Fiona A.

AU - Stern, Daniel

AU - Zhang, William

PY - 2015

Y1 - 2015

N2 - We present temporal and spectral analysis of simultaneous 0.5-79 keV Swift-XRT and Nuclear Spectroscopic Telescope Array observations of the magnetar 4U 0142+61. The pulse profile changes significantly with photon energy between 3 and 35 keV. The pulse fraction increases with energy, reaching a value of ≈20%, similar to that observed in 1E 1841-045 and much lower than the ≈80% pulse fraction observed in 1E 2259+586. We do not detect the 55 ks phase modulation reported in previous Suzaku-HXD observations. The phase-averaged spectrum of 4U 0142+61 above 20 keV is dominated by a hard power law (PL) with a photon index ΓH ~ 0.65, and the spectrum below 20 keV can be described by two blackbodies, a blackbody plus a soft PL, or by a Comptonized blackbody model. We study the full phase-resolved spectra using the e± outflow model of Beloborodov. Our results are consistent with the parameters of the active j-bundle derived from INTEGRAL data by Hascoe¨t et al. We find that a significant degeneracy appears in the inferred parameters if the footprint of the j-bundle is allowed to be a thin ring instead of a polar cap. The degeneracy is reduced when the footprint is required to be the hot spot inferred from the soft X-ray data.

AB - We present temporal and spectral analysis of simultaneous 0.5-79 keV Swift-XRT and Nuclear Spectroscopic Telescope Array observations of the magnetar 4U 0142+61. The pulse profile changes significantly with photon energy between 3 and 35 keV. The pulse fraction increases with energy, reaching a value of ≈20%, similar to that observed in 1E 1841-045 and much lower than the ≈80% pulse fraction observed in 1E 2259+586. We do not detect the 55 ks phase modulation reported in previous Suzaku-HXD observations. The phase-averaged spectrum of 4U 0142+61 above 20 keV is dominated by a hard power law (PL) with a photon index ΓH ~ 0.65, and the spectrum below 20 keV can be described by two blackbodies, a blackbody plus a soft PL, or by a Comptonized blackbody model. We study the full phase-resolved spectra using the e± outflow model of Beloborodov. Our results are consistent with the parameters of the active j-bundle derived from INTEGRAL data by Hascoe¨t et al. We find that a significant degeneracy appears in the inferred parameters if the footprint of the j-bundle is allowed to be a thin ring instead of a polar cap. The degeneracy is reduced when the footprint is required to be the hot spot inferred from the soft X-ray data.

U2 - 10.1088/0004-637X/808/1/32

DO - 10.1088/0004-637X/808/1/32

M3 - Journal article

SN - 0004-637X

VL - 808

SP - 1

EP - 13

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

Phase-resolved NuSTAR and SWIFT-XRT observations of magnetar 4U 0142+61

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