Confirmation of a high magnetic field in GRO J1008-57

Eric C. Bellm; Felix Fuerst; Katja Pottschmidt; John A. Tomsick; Steven E. Boggs; Deepto Chakrabarty; Finn Erland Christensen; William W. Craig; Charles J. Hailey; Fiona A. Harrison; Daniel Stern; Dominic J. Walton; Joern Wilms; William W. Zhang

doi:10.1088/0004-637X/792/2/108

Confirmation of a high magnetic field in GRO J1008-57

Eric C. Bellm, Felix Fuerst, Katja Pottschmidt, John A. Tomsick, Steven E. Boggs, Deepto Chakrabarty, Finn Erland Christensen, William W. Craig, Charles J. Hailey, Fiona A. Harrison, Daniel Stern, Dominic J. Walton, Joern Wilms, William W. Zhang

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Abstract

GRO J1008-57 is a high-mass X-ray binary for which several claims of a cyclotron resonance scattering feature near 80 keV have been reported. We use NuSTAR, Suzaku, and Swift data from its giant outburst of 2012 November to confirm the existence of the 80 keV feature and perform the most sensitive search to date for cyclotron scattering features at lower energies. We find evidence for a 78(-2)(+3) keV line in the NuSTAR and Suzaku data at >4 sigma significance, confirming the detection using Suzaku alone by Yamamoto et al. A search of both the phase-averaged and phase-resolved data rules out a fundamental at lower energies with optical depth larger than 5% of the 78 keV line. These results indicate that GRO J1008-57 has a magnetic field of 6.7 x 10(12)(1 + z) G, the highest among known accreting pulsars.

Original language	English
Article number	108
Journal	Astrophysical Journal
Volume	792
Issue number	2
Number of pages	7
ISSN	0004-637X
DOIs	https://doi.org/10.1088/0004-637X/792/2/108
Publication status	Published - 2014

Keywords

ASTRONOMY
SPECTROSCOPIC-TELESCOPE-ARRAY
X-RAY PULSARS
CYCLOTRON LINE
LMC X-4
ENERGY
ABSORPTION
DISCOVERY
SPECTRUM
MISSION
BINARY
pulsars: individual (GRO J1008-57)
stars: neutron
X-rays: binaries

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0004 637X 792 2 108Final published version, 599 KB

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title = "Confirmation of a high magnetic field in GRO J1008-57",

abstract = "GRO J1008-57 is a high-mass X-ray binary for which several claims of a cyclotron resonance scattering feature near 80 keV have been reported. We use NuSTAR, Suzaku, and Swift data from its giant outburst of 2012 November to confirm the existence of the 80 keV feature and perform the most sensitive search to date for cyclotron scattering features at lower energies. We find evidence for a 78(-2)(+3) keV line in the NuSTAR and Suzaku data at >4 sigma significance, confirming the detection using Suzaku alone by Yamamoto et al. A search of both the phase-averaged and phase-resolved data rules out a fundamental at lower energies with optical depth larger than 5% of the 78 keV line. These results indicate that GRO J1008-57 has a magnetic field of 6.7 x 10(12)(1 + z) G, the highest among known accreting pulsars.",

keywords = "ASTRONOMY, SPECTROSCOPIC-TELESCOPE-ARRAY, X-RAY PULSARS, CYCLOTRON LINE, LMC X-4, ENERGY, ABSORPTION, DISCOVERY, SPECTRUM, MISSION, BINARY, pulsars: individual (GRO J1008-57), stars: neutron, X-rays: binaries",

author = "Bellm, {Eric C.} and Felix Fuerst and Katja Pottschmidt and Tomsick, {John A.} and Boggs, {Steven E.} and Deepto Chakrabarty and Christensen, {Finn Erland} and Craig, {William W.} and Hailey, {Charles J.} and Harrison, {Fiona A.} and Daniel Stern and Walton, {Dominic J.} and Joern Wilms and Zhang, {William W.}",

year = "2014",

doi = "10.1088/0004-637X/792/2/108",

language = "English",

volume = "792",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

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TY - JOUR

T1 - Confirmation of a high magnetic field in GRO J1008-57

AU - Bellm, Eric C.

AU - Fuerst, Felix

AU - Pottschmidt, Katja

AU - Tomsick, John A.

AU - Boggs, Steven E.

AU - Chakrabarty, Deepto

AU - Christensen, Finn Erland

AU - Craig, William W.

AU - Hailey, Charles J.

AU - Harrison, Fiona A.

AU - Stern, Daniel

AU - Walton, Dominic J.

AU - Wilms, Joern

AU - Zhang, William W.

PY - 2014

Y1 - 2014

N2 - GRO J1008-57 is a high-mass X-ray binary for which several claims of a cyclotron resonance scattering feature near 80 keV have been reported. We use NuSTAR, Suzaku, and Swift data from its giant outburst of 2012 November to confirm the existence of the 80 keV feature and perform the most sensitive search to date for cyclotron scattering features at lower energies. We find evidence for a 78(-2)(+3) keV line in the NuSTAR and Suzaku data at >4 sigma significance, confirming the detection using Suzaku alone by Yamamoto et al. A search of both the phase-averaged and phase-resolved data rules out a fundamental at lower energies with optical depth larger than 5% of the 78 keV line. These results indicate that GRO J1008-57 has a magnetic field of 6.7 x 10(12)(1 + z) G, the highest among known accreting pulsars.

AB - GRO J1008-57 is a high-mass X-ray binary for which several claims of a cyclotron resonance scattering feature near 80 keV have been reported. We use NuSTAR, Suzaku, and Swift data from its giant outburst of 2012 November to confirm the existence of the 80 keV feature and perform the most sensitive search to date for cyclotron scattering features at lower energies. We find evidence for a 78(-2)(+3) keV line in the NuSTAR and Suzaku data at >4 sigma significance, confirming the detection using Suzaku alone by Yamamoto et al. A search of both the phase-averaged and phase-resolved data rules out a fundamental at lower energies with optical depth larger than 5% of the 78 keV line. These results indicate that GRO J1008-57 has a magnetic field of 6.7 x 10(12)(1 + z) G, the highest among known accreting pulsars.

KW - ASTRONOMY

KW - SPECTROSCOPIC-TELESCOPE-ARRAY

KW - X-RAY PULSARS

KW - CYCLOTRON LINE

KW - LMC X-4

KW - ENERGY

KW - ABSORPTION

KW - DISCOVERY

KW - SPECTRUM

KW - MISSION

KW - BINARY

KW - pulsars: individual (GRO J1008-57)

KW - stars: neutron

KW - X-rays: binaries

U2 - 10.1088/0004-637X/792/2/108

DO - 10.1088/0004-637X/792/2/108

M3 - Journal article

SN - 0004-637X

VL - 792

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 108

ER -

Confirmation of a high magnetic field in GRO J1008-57

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Keywords

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