The variable hard x-ray emission of NGC 4945 as observed by NUSTAR

Simonetta Puccetti; Andrea Comastri; Fabrizio Fiore; Patricia Arevalo; Guido Risaliti; Franz E. Bauer; William N. Brandt; Daniel Stern; Fiona A. Harrison; David M. Alexander; Steve E. Boggs; Finn Erland Christensen; William W. Craig; Poshak Gandhi; Charles J. Hailey; Michael J. Koss; George B. Lansbury; Bin Luo; Greg M. Madejski; Giorgio Matt; Dominic J. Walton; Will Zhang

doi:10.1088/0004-637X/793/1/26

The variable hard x-ray emission of NGC 4945 as observed by NUSTAR

Simonetta Puccetti, Andrea Comastri, Fabrizio Fiore, Patricia Arevalo, Guido Risaliti, Franz E. Bauer, William N. Brandt, Daniel Stern, Fiona A. Harrison, David M. Alexander, Steve E. Boggs, Finn Erland Christensen, William W. Craig, Poshak Gandhi, Charles J. Hailey, Michael J. Koss, George B. Lansbury, Bin Luo, Greg M. Madejski, Giorgio MattDominic J. Walton, Will Zhang

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Abstract

We present a broadband (~0.5-79 keV) spectral and temporal analysis of multiple NuSTAR observations combined with archival Suzaku and Chandra data of NGC 4945, the brightest extragalactic source at 100 keV. We observe hard X-ray (>10 keV) flux and spectral variability, with flux variations of a factor of two on timescales of 20 ks. A variable primary continuum dominates the high-energy spectrum (>10 keV) in all states, while the reflected/scattered flux that dominates at E

Original language	English
Article number	26
Journal	Astrophysical Journal
Volume	793
Issue number	1
Number of pages	17
ISSN	0004-637X
DOIs	https://doi.org/10.1088/0004-637X/793/1/26
Publication status	Published - 2014

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0004 637X 793 1 26Final published version, 2.1 MB

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Puccetti, S., Comastri, A., Fiore, F., Arevalo, P., Risaliti, G., Bauer, F. E., Brandt, W. N., Stern, D., Harrison, F. A., Alexander, D. M., Boggs, S. E., Christensen, F. E., Craig, W. W., Gandhi, P., Hailey, C. J., Koss, M. J., Lansbury, G. B., Luo, B., Madejski, G. M., ... Zhang, W. (2014). The variable hard x-ray emission of NGC 4945 as observed by NUSTAR. Astrophysical Journal, 793(1), Article 26. https://doi.org/10.1088/0004-637X/793/1/26

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title = "The variable hard x-ray emission of NGC 4945 as observed by NUSTAR",

abstract = "We present a broadband (~0.5-79 keV) spectral and temporal analysis of multiple NuSTAR observations combined with archival Suzaku and Chandra data of NGC 4945, the brightest extragalactic source at 100 keV. We observe hard X-ray (>10 keV) flux and spectral variability, with flux variations of a factor of two on timescales of 20 ks. A variable primary continuum dominates the high-energy spectrum (>10 keV) in all states, while the reflected/scattered flux that dominates at E ",

author = "Simonetta Puccetti and Andrea Comastri and Fabrizio Fiore and Patricia Arevalo and Guido Risaliti and Bauer, {Franz E.} and Brandt, {William N.} and Daniel Stern and Harrison, {Fiona A.} and Alexander, {David M.} and Boggs, {Steve E.} and Christensen, {Finn Erland} and Craig, {William W.} and Poshak Gandhi and Hailey, {Charles J.} and Koss, {Michael J.} and Lansbury, {George B.} and Bin Luo and Madejski, {Greg M.} and Giorgio Matt and Walton, {Dominic J.} and Will Zhang",

year = "2014",

doi = "10.1088/0004-637X/793/1/26",

language = "English",

volume = "793",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Puccetti, S, Comastri, A, Fiore, F, Arevalo, P, Risaliti, G, Bauer, FE, Brandt, WN, Stern, D, Harrison, FA, Alexander, DM, Boggs, SE, Christensen, FE, Craig, WW, Gandhi, P, Hailey, CJ, Koss, MJ, Lansbury, GB, Luo, B, Madejski, GM, Matt, G, Walton, DJ & Zhang, W 2014, 'The variable hard x-ray emission of NGC 4945 as observed by NUSTAR', Astrophysical Journal, vol. 793, no. 1, 26. https://doi.org/10.1088/0004-637X/793/1/26

TY - JOUR

T1 - The variable hard x-ray emission of NGC 4945 as observed by NUSTAR

AU - Puccetti, Simonetta

AU - Comastri, Andrea

AU - Fiore, Fabrizio

AU - Arevalo, Patricia

AU - Risaliti, Guido

AU - Bauer, Franz E.

AU - Brandt, William N.

AU - Stern, Daniel

AU - Harrison, Fiona A.

AU - Alexander, David M.

AU - Boggs, Steve E.

AU - Christensen, Finn Erland

AU - Craig, William W.

AU - Gandhi, Poshak

AU - Hailey, Charles J.

AU - Koss, Michael J.

AU - Lansbury, George B.

AU - Luo, Bin

AU - Madejski, Greg M.

AU - Matt, Giorgio

AU - Walton, Dominic J.

AU - Zhang, Will

PY - 2014

Y1 - 2014

N2 - We present a broadband (~0.5-79 keV) spectral and temporal analysis of multiple NuSTAR observations combined with archival Suzaku and Chandra data of NGC 4945, the brightest extragalactic source at 100 keV. We observe hard X-ray (>10 keV) flux and spectral variability, with flux variations of a factor of two on timescales of 20 ks. A variable primary continuum dominates the high-energy spectrum (>10 keV) in all states, while the reflected/scattered flux that dominates at E

AB - We present a broadband (~0.5-79 keV) spectral and temporal analysis of multiple NuSTAR observations combined with archival Suzaku and Chandra data of NGC 4945, the brightest extragalactic source at 100 keV. We observe hard X-ray (>10 keV) flux and spectral variability, with flux variations of a factor of two on timescales of 20 ks. A variable primary continuum dominates the high-energy spectrum (>10 keV) in all states, while the reflected/scattered flux that dominates at E

U2 - 10.1088/0004-637X/793/1/26

DO - 10.1088/0004-637X/793/1/26

M3 - Journal article

SN - 0004-637X

VL - 793

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 26

ER -

The variable hard x-ray emission of NGC 4945 as observed by NUSTAR

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