The NuSTAR ULX program

William W. Zhang; Daniel Stern; William W. Craig; Michael Parker; Guido Risaliti; Steven E. Boggs; Charles J. Hailey; Brian W. Grefenstette; Karl Forster; Finn Erland Christensen; Jon M. Miller; Fiona A. Harrison; Felix Fürst; Natalie A. Webb; Ann E. Hornschemeier; Didier Barret; Andrew C. Fabian; Vikram R. Rana; Kristin K. Madsen; Andrew Ptak; Matteo Bachetti; Dominic J. Walton

doi:10.1051/epjconf/20136406010

The NuSTAR ULX program

William W. Zhang, Daniel Stern, William W. Craig, Michael Parker, Guido Risaliti, Steven E. Boggs, Charles J. Hailey, Brian W. Grefenstette, Karl Forster, Finn Erland Christensen, Jon M. Miller, Fiona A. Harrison, Felix Fürst, Natalie A. Webb, Ann E. Hornschemeier, Didier Barret, Andrew C. Fabian, Vikram R. Rana, Kristin K. Madsen, Andrew PtakMatteo Bachetti, Dominic J. Walton

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Abstract

We present the results of the first large program of broadband ULX observations with NuSTAR, XMM-Newton and Suzaku, yielding high-quality spectra and timing measurements from 0.3-30 keV in 6 ULXs, providing powerful information for understanding the accretion modes and nature of the central BHs. In particular, we find that all ULXs in our sample have a clear cutoff above 10 keV. This cutoff is less pronounced than expected by Comptonization from a cold, thick corona. We confirm the presence of a soft excess at low energies in the brightest ULXs, with temperatures below ~ 0.5 keV. We make an estimates on the masses of several ULXs based on spectral variability and model fitting. © 2014 Owned by the authors.

Original language	English
Article number	06010
Journal	E P J Web of Conferences
Volume	64
Number of pages	4
ISSN	2100-014X
DOIs	https://doi.org/10.1051/epjconf/20136406010
Publication status	Published - 2014

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Zhang, W. W., Stern, D., Craig, W. W., Parker, M., Risaliti, G., Boggs, S. E., Hailey, C. J., Grefenstette, B. W., Forster, K., Christensen, F. E., Miller, J. M., Harrison, F. A., Fürst, F., Webb, N. A., Hornschemeier, A. E., Barret, D., Fabian, A. C., Rana, V. R., Madsen, K. K., ... Walton, D. J. (2014). The NuSTAR ULX program. E P J Web of Conferences, 64, Article 06010. https://doi.org/10.1051/epjconf/20136406010

@article{138f04a697bc4bb3b1598be575d3de9f,

title = "The NuSTAR ULX program",

abstract = "We present the results of the first large program of broadband ULX observations with NuSTAR, XMM-Newton and Suzaku, yielding high-quality spectra and timing measurements from 0.3-30 keV in 6 ULXs, providing powerful information for understanding the accretion modes and nature of the central BHs. In particular, we find that all ULXs in our sample have a clear cutoff above 10 keV. This cutoff is less pronounced than expected by Comptonization from a cold, thick corona. We confirm the presence of a soft excess at low energies in the brightest ULXs, with temperatures below \textasciitilde{} 0.5 keV. We make an estimates on the masses of several ULXs based on spectral variability and model fitting. {\textcopyright} 2014 Owned by the authors.",

author = "Zhang, \{William W.\} and Daniel Stern and Craig, \{William W.\} and Michael Parker and Guido Risaliti and Boggs, \{Steven E.\} and Hailey, \{Charles J.\} and Grefenstette, \{Brian W.\} and Karl Forster and Christensen, \{Finn Erland\} and Miller, \{Jon M.\} and Harrison, \{Fiona A.\} and Felix F{\"u}rst and Webb, \{Natalie A.\} and Hornschemeier, \{Ann E.\} and Didier Barret and Fabian, \{Andrew C.\} and Rana, \{Vikram R.\} and Madsen, \{Kristin K.\} and Andrew Ptak and Matteo Bachetti and Walton, \{Dominic J.\}",

year = "2014",

doi = "10.1051/epjconf/20136406010",

language = "English",

volume = "64",

journal = "E P J Web of Conferences",

issn = "2100-014X",

publisher = "E D P Sciences",

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Zhang, WW, Stern, D, Craig, WW, Parker, M, Risaliti, G, Boggs, SE, Hailey, CJ, Grefenstette, BW, Forster, K, Christensen, FE, Miller, JM, Harrison, FA, Fürst, F, Webb, NA, Hornschemeier, AE, Barret, D, Fabian, AC, Rana, VR, Madsen, KK, Ptak, A, Bachetti, M & Walton, DJ 2014, 'The NuSTAR ULX program', E P J Web of Conferences, vol. 64, 06010. https://doi.org/10.1051/epjconf/20136406010

TY - JOUR

T1 - The NuSTAR ULX program

AU - Zhang, William W.

AU - Stern, Daniel

AU - Craig, William W.

AU - Parker, Michael

AU - Risaliti, Guido

AU - Boggs, Steven E.

AU - Hailey, Charles J.

AU - Grefenstette, Brian W.

AU - Forster, Karl

AU - Christensen, Finn Erland

AU - Miller, Jon M.

AU - Harrison, Fiona A.

AU - Fürst, Felix

AU - Webb, Natalie A.

AU - Hornschemeier, Ann E.

AU - Barret, Didier

AU - Fabian, Andrew C.

AU - Rana, Vikram R.

AU - Madsen, Kristin K.

AU - Ptak, Andrew

AU - Bachetti, Matteo

AU - Walton, Dominic J.

PY - 2014

Y1 - 2014

N2 - We present the results of the first large program of broadband ULX observations with NuSTAR, XMM-Newton and Suzaku, yielding high-quality spectra and timing measurements from 0.3-30 keV in 6 ULXs, providing powerful information for understanding the accretion modes and nature of the central BHs. In particular, we find that all ULXs in our sample have a clear cutoff above 10 keV. This cutoff is less pronounced than expected by Comptonization from a cold, thick corona. We confirm the presence of a soft excess at low energies in the brightest ULXs, with temperatures below ~ 0.5 keV. We make an estimates on the masses of several ULXs based on spectral variability and model fitting. © 2014 Owned by the authors.

AB - We present the results of the first large program of broadband ULX observations with NuSTAR, XMM-Newton and Suzaku, yielding high-quality spectra and timing measurements from 0.3-30 keV in 6 ULXs, providing powerful information for understanding the accretion modes and nature of the central BHs. In particular, we find that all ULXs in our sample have a clear cutoff above 10 keV. This cutoff is less pronounced than expected by Comptonization from a cold, thick corona. We confirm the presence of a soft excess at low energies in the brightest ULXs, with temperatures below ~ 0.5 keV. We make an estimates on the masses of several ULXs based on spectral variability and model fitting. © 2014 Owned by the authors.

U2 - 10.1051/epjconf/20136406010

DO - 10.1051/epjconf/20136406010

M3 - Journal article

SN - 2100-014X

VL - 64

JO - E P J Web of Conferences

JF - E P J Web of Conferences

M1 - 06010

ER -

The NuSTAR ULX program

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