NuSTAR and INTEGRAL observations of a low/hard state of 1E1740.7-2942

Lorenzo Natalucci; John A. Tomsick; Angela Bazzano; David M. Smith; Matteo Bachetti; Didier Barret; Steven E. Boggs; Finn Erland Christensen; William W. Craig; Mariateresa Fiocchi; Felix Fuerst; Brian W. Grefenstette; Charles J. Hailey; Fiona A. Harrison; Roman Krivonos; Erik Kuulkers; Jon M. Miller; Katja Pottschmidt; Daniel Stern; Pietro Ubertini; Dominic J. Walton; William W. Zhang

doi:10.1088/0004-637X/780/1/63

NuSTAR and INTEGRAL observations of a low/hard state of 1E1740.7-2942

Lorenzo Natalucci, John A. Tomsick, Angela Bazzano, David M. Smith, Matteo Bachetti, Didier Barret, Steven E. Boggs, Finn Erland Christensen, William W. Craig, Mariateresa Fiocchi, Felix Fuerst, Brian W. Grefenstette, Charles J. Hailey, Fiona A. Harrison, Roman Krivonos, Erik Kuulkers, Jon M. Miller, Katja Pottschmidt, Daniel Stern, Pietro UbertiniDominic J. Walton, William W. Zhang

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Abstract

The microquasar 1E1740.7-2942, also known as the "Great Annihilator", was observed by NuSTAR in the Summer of 2012. We have analyzed in detail two observations taken ~2 weeks apart, for which we measure hard and smooth spectra typical of the low/hard state. A few weeks later the source flux declined significantly. Nearly simultaneous coverage by INTEGRAL is available from its Galactic Center monitoring campaign lasting ~2.5 months. These data probe the hard state spectrum from 1E1740.7-2942 before the flux decline. We find good agreement between the spectra taken with IBIS/ISGRI and NuSTAR, with the measurements being compatible with a change in flux with no spectral variability. We present a detailed analysis of the NuSTAR spectral and timing data and upper limits for reflection of the high energy emission. We show that the high energy spectrum of this X-ray binary is well described by thermal Comptonization.

Original language	English
Journal	Astrophysical Journal
Volume	780
Issue number	1
Number of pages	8
ISSN	0004-637X
DOIs	https://doi.org/10.1088/0004-637X/780/1/63
Publication status	Published - 2014

Keywords

Accretion
Accretion disks
Black hole physics
X-ray: binaries
X-ray: individual

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10.1088/0004-637X/780/1/63

0004 637X 780 1 63Final published version, 1.43 MB

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Natalucci, L., Tomsick, J. A., Bazzano, A., Smith, D. M., Bachetti, M., Barret, D., Boggs, S. E., Christensen, F. E., Craig, W. W., Fiocchi, M., Fuerst, F., Grefenstette, B. W., Hailey, C. J., Harrison, F. A., Krivonos, R., Kuulkers, E., Miller, J. M., Pottschmidt, K., Stern, D., ... Zhang, W. W. (2014). NuSTAR and INTEGRAL observations of a low/hard state of 1E1740.7-2942. Astrophysical Journal, 780(1). https://doi.org/10.1088/0004-637X/780/1/63

@article{8b6720ef70d747c6930ad8668cb750d6,

title = "NuSTAR and INTEGRAL observations of a low/hard state of 1E1740.7-2942",

abstract = "The microquasar 1E1740.7-2942, also known as the {"}Great Annihilator{"}, was observed by NuSTAR in the Summer of 2012. We have analyzed in detail two observations taken ~2 weeks apart, for which we measure hard and smooth spectra typical of the low/hard state. A few weeks later the source flux declined significantly. Nearly simultaneous coverage by INTEGRAL is available from its Galactic Center monitoring campaign lasting ~2.5 months. These data probe the hard state spectrum from 1E1740.7-2942 before the flux decline. We find good agreement between the spectra taken with IBIS/ISGRI and NuSTAR, with the measurements being compatible with a change in flux with no spectral variability. We present a detailed analysis of the NuSTAR spectral and timing data and upper limits for reflection of the high energy emission. We show that the high energy spectrum of this X-ray binary is well described by thermal Comptonization.",

keywords = "Accretion, Accretion disks, Black hole physics, X-ray: binaries, X-ray: individual",

author = "Lorenzo Natalucci and Tomsick, {John A.} and Angela Bazzano and Smith, {David M.} and Matteo Bachetti and Didier Barret and Boggs, {Steven E.} and Christensen, {Finn Erland} and Craig, {William W.} and Mariateresa Fiocchi and Felix Fuerst and Grefenstette, {Brian W.} and Hailey, {Charles J.} and Harrison, {Fiona A.} and Roman Krivonos and Erik Kuulkers and Miller, {Jon M.} and Katja Pottschmidt and Daniel Stern and Pietro Ubertini and Walton, {Dominic J.} and Zhang, {William W.}",

year = "2014",

doi = "10.1088/0004-637X/780/1/63",

language = "English",

volume = "780",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Natalucci, L, Tomsick, JA, Bazzano, A, Smith, DM, Bachetti, M, Barret, D, Boggs, SE, Christensen, FE, Craig, WW, Fiocchi, M, Fuerst, F, Grefenstette, BW, Hailey, CJ, Harrison, FA, Krivonos, R, Kuulkers, E, Miller, JM, Pottschmidt, K, Stern, D, Ubertini, P, Walton, DJ & Zhang, WW 2014, 'NuSTAR and INTEGRAL observations of a low/hard state of 1E1740.7-2942', Astrophysical Journal, vol. 780, no. 1. https://doi.org/10.1088/0004-637X/780/1/63

TY - JOUR

T1 - NuSTAR and INTEGRAL observations of a low/hard state of 1E1740.7-2942

AU - Natalucci, Lorenzo

AU - Tomsick, John A.

AU - Bazzano, Angela

AU - Smith, David M.

AU - Bachetti, Matteo

AU - Barret, Didier

AU - Boggs, Steven E.

AU - Christensen, Finn Erland

AU - Craig, William W.

AU - Fiocchi, Mariateresa

AU - Fuerst, Felix

AU - Grefenstette, Brian W.

AU - Hailey, Charles J.

AU - Harrison, Fiona A.

AU - Krivonos, Roman

AU - Kuulkers, Erik

AU - Miller, Jon M.

AU - Pottschmidt, Katja

AU - Stern, Daniel

AU - Ubertini, Pietro

AU - Walton, Dominic J.

AU - Zhang, William W.

PY - 2014

Y1 - 2014

N2 - The microquasar 1E1740.7-2942, also known as the "Great Annihilator", was observed by NuSTAR in the Summer of 2012. We have analyzed in detail two observations taken ~2 weeks apart, for which we measure hard and smooth spectra typical of the low/hard state. A few weeks later the source flux declined significantly. Nearly simultaneous coverage by INTEGRAL is available from its Galactic Center monitoring campaign lasting ~2.5 months. These data probe the hard state spectrum from 1E1740.7-2942 before the flux decline. We find good agreement between the spectra taken with IBIS/ISGRI and NuSTAR, with the measurements being compatible with a change in flux with no spectral variability. We present a detailed analysis of the NuSTAR spectral and timing data and upper limits for reflection of the high energy emission. We show that the high energy spectrum of this X-ray binary is well described by thermal Comptonization.

AB - The microquasar 1E1740.7-2942, also known as the "Great Annihilator", was observed by NuSTAR in the Summer of 2012. We have analyzed in detail two observations taken ~2 weeks apart, for which we measure hard and smooth spectra typical of the low/hard state. A few weeks later the source flux declined significantly. Nearly simultaneous coverage by INTEGRAL is available from its Galactic Center monitoring campaign lasting ~2.5 months. These data probe the hard state spectrum from 1E1740.7-2942 before the flux decline. We find good agreement between the spectra taken with IBIS/ISGRI and NuSTAR, with the measurements being compatible with a change in flux with no spectral variability. We present a detailed analysis of the NuSTAR spectral and timing data and upper limits for reflection of the high energy emission. We show that the high energy spectrum of this X-ray binary is well described by thermal Comptonization.

KW - Accretion

KW - Accretion disks

KW - Black hole physics

KW - X-ray: binaries

KW - X-ray: individual

U2 - 10.1088/0004-637X/780/1/63

DO - 10.1088/0004-637X/780/1/63

M3 - Journal article

SN - 0004-637X

VL - 780

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

NuSTAR and INTEGRAL observations of a low/hard state of 1E1740.7-2942

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Keywords

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