A NuSTAR observation of the reflection spectrum of the low-mass X-ray binary 4U 1728-34

Clio C. Sleator; John A. Tomsick; Ashley L. King; Jon M. Miller; Steven E. Boggs; Matteo Bachetti; Didier Barret; Jérôme Chenevez; Finn Erland Christensen; William W. Craig; Charles J. Hailey; Fiona A. Harrison; Farid Rahoui; Daniel K. Stern; Dominic J. Walton; William W. Zhang

doi:10.3847/0004-637X/827/2/134

A NuSTAR observation of the reflection spectrum of the low-mass X-ray binary 4U 1728-34

Clio C. Sleator, John A. Tomsick, Ashley L. King, Jon M. Miller, Steven E. Boggs, Matteo Bachetti, Didier Barret, Jérôme Chenevez, Finn Erland Christensen, William W. Craig, Charles J. Hailey, Fiona A. Harrison, Farid Rahoui, Daniel K. Stern, Dominic J. Walton, William W. Zhang

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Abstract

We report on a simultaneous NuSTAR and Swift observation of the neutron star low-mass X-ray binary 4U 1728-34. We identified and removed four Type I X-ray bursts during the observation in order to study the persistent emission. The continuum spectrum is hard and described well by a blackbody with kT = 1.5 keV and a cutoff power law with Γ = 1.5, and a cutoff temperature of 25 keV. Residuals between 6 and 8 keV provide strong evidence of a broad Fe Kα line. By modeling the spectrum with a relativistically blurred reflection model, we find an upper limit for the inner disk radius of R_in≤2R_ISCO.Consequently, we find that R_NS ≤ 23 km, assuming M = 1.4 M ⊙ and a = 0.15. We also find an upper limit on the magnetic field of B ≤ 2 × 10⁸ G.

Original language	English
Article number	134
Journal	Astrophysical Journal
Volume	827
Issue number	2
Number of pages	11
ISSN	0004-637X
DOIs	https://doi.org/10.3847/0004-637X/827/2/134
Publication status	Published - 2016

Keywords

Accretion, accretion disks
Stars: neutron
X-rays: binaries

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Sleator, C. C., Tomsick, J. A., King, A. L., Miller, J. M., Boggs, S. E., Bachetti, M., Barret, D., Chenevez, J., Christensen, F. E., Craig, W. W., Hailey, C. J., Harrison, F. A., Rahoui, F., Stern, D. K., Walton, D. J., & Zhang, W. W. (2016). A NuSTAR observation of the reflection spectrum of the low-mass X-ray binary 4U 1728-34. Astrophysical Journal, 827(2), Article 134. https://doi.org/10.3847/0004-637X/827/2/134

@article{b3ec07f0281f4cc0aa1e49c4eb25b276,

title = "A NuSTAR observation of the reflection spectrum of the low-mass X-ray binary 4U 1728-34",

abstract = "We report on a simultaneous NuSTAR and Swift observation of the neutron star low-mass X-ray binary 4U 1728-34. We identified and removed four Type I X-ray bursts during the observation in order to study the persistent emission. The continuum spectrum is hard and described well by a blackbody with kT = 1.5 keV and a cutoff power law with Γ = 1.5, and a cutoff temperature of 25 keV. Residuals between 6 and 8 keV provide strong evidence of a broad Fe Kα line. By modeling the spectrum with a relativistically blurred reflection model, we find an upper limit for the inner disk radius of Rin≤2RISCO. Consequently, we find that RNS ≤ 23 km, assuming M = 1.4 M ⊙ and a = 0.15. We also find an upper limit on the magnetic field of B ≤ 2 × 108 G.",

keywords = "Accretion, accretion disks, Stars: neutron, X-rays: binaries",

author = "Sleator, {Clio C.} and Tomsick, {John A.} and King, {Ashley L.} and Miller, {Jon M.} and Boggs, {Steven E.} and Matteo Bachetti and Didier Barret and J{\'e}r{\^o}me Chenevez and Christensen, {Finn Erland} and Craig, {William W.} and Hailey, {Charles J.} and Harrison, {Fiona A.} and Farid Rahoui and Stern, {Daniel K.} and Walton, {Dominic J.} and Zhang, {William W.}",

year = "2016",

doi = "10.3847/0004-637X/827/2/134",

language = "English",

volume = "827",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

}

Sleator, CC, Tomsick, JA, King, AL, Miller, JM, Boggs, SE, Bachetti, M, Barret, D, Chenevez, J , Christensen, FE, Craig, WW, Hailey, CJ, Harrison, FA, Rahoui, F, Stern, DK, Walton, DJ & Zhang, WW 2016, 'A NuSTAR observation of the reflection spectrum of the low-mass X-ray binary 4U 1728-34', Astrophysical Journal, vol. 827, no. 2, 134. https://doi.org/10.3847/0004-637X/827/2/134

TY - JOUR

T1 - A NuSTAR observation of the reflection spectrum of the low-mass X-ray binary 4U 1728-34

AU - Sleator, Clio C.

AU - Tomsick, John A.

AU - King, Ashley L.

AU - Miller, Jon M.

AU - Boggs, Steven E.

AU - Bachetti, Matteo

AU - Barret, Didier

AU - Chenevez, Jérôme

AU - Christensen, Finn Erland

AU - Craig, William W.

AU - Hailey, Charles J.

AU - Harrison, Fiona A.

AU - Rahoui, Farid

AU - Stern, Daniel K.

AU - Walton, Dominic J.

AU - Zhang, William W.

PY - 2016

Y1 - 2016

N2 - We report on a simultaneous NuSTAR and Swift observation of the neutron star low-mass X-ray binary 4U 1728-34. We identified and removed four Type I X-ray bursts during the observation in order to study the persistent emission. The continuum spectrum is hard and described well by a blackbody with kT = 1.5 keV and a cutoff power law with Γ = 1.5, and a cutoff temperature of 25 keV. Residuals between 6 and 8 keV provide strong evidence of a broad Fe Kα line. By modeling the spectrum with a relativistically blurred reflection model, we find an upper limit for the inner disk radius of Rin≤2RISCO. Consequently, we find that RNS ≤ 23 km, assuming M = 1.4 M ⊙ and a = 0.15. We also find an upper limit on the magnetic field of B ≤ 2 × 108 G.

AB - We report on a simultaneous NuSTAR and Swift observation of the neutron star low-mass X-ray binary 4U 1728-34. We identified and removed four Type I X-ray bursts during the observation in order to study the persistent emission. The continuum spectrum is hard and described well by a blackbody with kT = 1.5 keV and a cutoff power law with Γ = 1.5, and a cutoff temperature of 25 keV. Residuals between 6 and 8 keV provide strong evidence of a broad Fe Kα line. By modeling the spectrum with a relativistically blurred reflection model, we find an upper limit for the inner disk radius of Rin≤2RISCO. Consequently, we find that RNS ≤ 23 km, assuming M = 1.4 M ⊙ and a = 0.15. We also find an upper limit on the magnetic field of B ≤ 2 × 108 G.

KW - Accretion, accretion disks

KW - Stars: neutron

KW - X-rays: binaries

U2 - 10.3847/0004-637X/827/2/134

DO - 10.3847/0004-637X/827/2/134

M3 - Journal article

SN - 0004-637X

VL - 827

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 134

ER -

A NuSTAR observation of the reflection spectrum of the low-mass X-ray binary 4U 1728-34

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