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 E. 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 E. Christensen, William W. Craig, Sebastien Guiilot, Charles A. Hailey, Fiona A. Harrison, Daniel Stern, William Zhang

School of Mechatronical Engineering

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

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 , 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 outflow model of Beloborodov.

Original language	English
Article number	32
Journal	Astrophysical Journal
Volume	808
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/808/1/32
Publication status	Published - 20 Jul 2015

Keywords

pulsars: individual (4U 0142+61)
stars: magnetars
stars: neutron

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

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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), Article 32. 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 , 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 outflow model of Beloborodov.",

keywords = "pulsars: individual (4U 0142+61), stars: magnetars, stars: neutron",

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 E.} and Craig, {William W.} and Sebastien Guiilot and Hailey, {Charles A.} and Harrison, {Fiona A.} and Daniel Stern and William Zhang",

year = "2015",

month = jul,

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

language = "English",

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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 E.

AU - Craig, William W.

AU - Guiilot, Sebastien

AU - Hailey, Charles A.

AU - Harrison, Fiona A.

AU - Stern, Daniel

AU - Zhang, William

PY - 2015/7/20

Y1 - 2015/7/20

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 , 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 outflow model of Beloborodov.

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 , 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 outflow model of Beloborodov.

KW - pulsars: individual (4U 0142+61)

KW - stars: magnetars

KW - stars: neutron

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SN - 0004-637X

VL - 808

JO - Astrophysical Journal

JF - Astrophysical Journal

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ER -

PHASE-RESOLVED NuSTAR and SWIFT-XRT OBSERVATIONS of MAGNETAR 4U 0142+61

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