NuSTAR observations of heavily obscured quasars at z ~ 0.5

G. B. Lansbury; D. M. Alexander; A. Del Moro; P. Gandhi; R. J. Assef; D. Stern; J. Aird; D. R. Ballantyne; M. Balokovic´; F. E. Bauer; S. E. Boggs; W. N. Brandt; Finn Erland Christensen; W. W. Craig; M. Elvis; B. W. Grefenstette; C. J. Hailey; F. A. Harrison; R. C. Hickox; M. Koss; S. M. LaMassa; B. Luo; J. R. Mullaney; S. H. Teng; C. M. Urry; W. W. Zhang

doi:10.1088/0004-637X/785/1/17

NuSTAR observations of heavily obscured quasars at z ~ 0.5

G. B. Lansbury
, D. M. Alexander
, A. Del Moro
, P. Gandhi
, R. J. Assef
, D. Stern
, J. Aird
, D. R. Ballantyne
, M. Balokovic´
, F. E. Bauer
, S. E. Boggs
, W. N. Brandt
, Finn Erland Christensen
, W. W. Craig
, M. Elvis
, B. W. Grefenstette
, C. J. Hailey
, F. A. Harrison
, R. C. Hickox
, M. Koss

S. M. LaMassa, B. Luo, J. R. Mullaney, S. H. Teng, C. M. Urry, W. W. Zhang

Durham University
Universidad Diego Portales
California Institute of Technology
Georgia Institute of Technology
Pontifícia Universidade Católica
University of California at Berkeley
Pennsylvania State University
Technical University of Denmark
Harvard-Smithsonian Center for Astrophysics
Columbia University
Swiss Federal Institute of Technology Zurich
Yale University
NASA Goddard Space Flight Center
Dartmouth College

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Abstract

We present NuSTAR hard X-ray observations of three Type 2 quasars at z ≈ 0.4-0.5, optically selected from the Sloan Digital Sky Survey. Although the quasars show evidence for being heavily obscured, Compton-thick systems on the basis of the 2-10 keV to [O III] luminosity ratio and multiwavelength diagnostics, their X-ray absorbing column densities (NH) are poorly known. In this analysis, (1) we study X-ray emission at >10 keV, where X-rays from the central black hole are relatively unabsorbed, in order to better constrain NH. (2) We further characterize the physical properties of the sources through broad-band near-UV to mid-IR spectral energy distribution analyses. One of the quasars is detected with NuSTAR at >8 keV with a no-source probability of

Original language	English
Article number	17
Journal	Astrophysical Journal
Volume	785
Issue number	1
Number of pages	10
ISSN	0004-637X
DOIs	https://doi.org/10.1088/0004-637X/785/1/17
Publication status	Published - 2014

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Lansbury, G. B., Alexander, D. M., Del Moro, A., Gandhi, P., Assef, R. J., Stern, D., Aird, J., Ballantyne, D. R., Balokovic´, M., Bauer, F. E., Boggs, S. E., Brandt, W. N., Christensen, F. E., Craig, W. W., Elvis, M., Grefenstette, B. W., Hailey, C. J., Harrison, F. A., Hickox, R. C., ... Zhang, W. W. (2014). NuSTAR observations of heavily obscured quasars at z ~ 0.5. Astrophysical Journal, 785(1), Article 17. https://doi.org/10.1088/0004-637X/785/1/17

@article{f7146aae812546de973d6caa95b8db8a,

title = "NuSTAR observations of heavily obscured quasars at z \textasciitilde{} 0.5",

abstract = "We present NuSTAR hard X-ray observations of three Type 2 quasars at z ≈ 0.4-0.5, optically selected from the Sloan Digital Sky Survey. Although the quasars show evidence for being heavily obscured, Compton-thick systems on the basis of the 2-10 keV to [O III] luminosity ratio and multiwavelength diagnostics, their X-ray absorbing column densities (NH) are poorly known. In this analysis, (1) we study X-ray emission at >10 keV, where X-rays from the central black hole are relatively unabsorbed, in order to better constrain NH. (2) We further characterize the physical properties of the sources through broad-band near-UV to mid-IR spectral energy distribution analyses. One of the quasars is detected with NuSTAR at >8 keV with a no-source probability of ",

author = "Lansbury, \{G. B.\} and Alexander, \{D. M.\} and \{Del Moro\}, A. and P. Gandhi and Assef, \{R. J.\} and D. Stern and J. Aird and Ballantyne, \{D. R.\} and M. Balokovic´ and Bauer, \{F. E.\} and Boggs, \{S. E.\} and Brandt, \{W. N.\} and Christensen, \{Finn Erland\} and Craig, \{W. W.\} and M. Elvis and Grefenstette, \{B. W.\} and Hailey, \{C. J.\} and Harrison, \{F. A.\} and Hickox, \{R. C.\} and M. Koss and LaMassa, \{S. M.\} and B. Luo and Mullaney, \{J. R.\} and Teng, \{S. H.\} and Urry, \{C. M.\} and Zhang, \{W. W.\}",

year = "2014",

doi = "10.1088/0004-637X/785/1/17",

language = "English",

volume = "785",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Lansbury, GB, Alexander, DM, Del Moro, A, Gandhi, P, Assef, RJ, Stern, D, Aird, J, Ballantyne, DR, Balokovic´, M, Bauer, FE, Boggs, SE, Brandt, WN, Christensen, FE, Craig, WW, Elvis, M, Grefenstette, BW, Hailey, CJ, Harrison, FA, Hickox, RC, Koss, M, LaMassa, SM, Luo, B, Mullaney, JR, Teng, SH, Urry, CM & Zhang, WW 2014, 'NuSTAR observations of heavily obscured quasars at z ~ 0.5', Astrophysical Journal, vol. 785, no. 1, 17. https://doi.org/10.1088/0004-637X/785/1/17

TY - JOUR

T1 - NuSTAR observations of heavily obscured quasars at z ~ 0.5

AU - Lansbury, G. B.

AU - Alexander, D. M.

AU - Del Moro, A.

AU - Gandhi, P.

AU - Assef, R. J.

AU - Stern, D.

AU - Aird, J.

AU - Ballantyne, D. R.

AU - Balokovic´, M.

AU - Bauer, F. E.

AU - Boggs, S. E.

AU - Brandt, W. N.

AU - Christensen, Finn Erland

AU - Craig, W. W.

AU - Elvis, M.

AU - Grefenstette, B. W.

AU - Hailey, C. J.

AU - Harrison, F. A.

AU - Hickox, R. C.

AU - Koss, M.

AU - LaMassa, S. M.

AU - Luo, B.

AU - Mullaney, J. R.

AU - Teng, S. H.

AU - Urry, C. M.

AU - Zhang, W. W.

PY - 2014

Y1 - 2014

N2 - We present NuSTAR hard X-ray observations of three Type 2 quasars at z ≈ 0.4-0.5, optically selected from the Sloan Digital Sky Survey. Although the quasars show evidence for being heavily obscured, Compton-thick systems on the basis of the 2-10 keV to [O III] luminosity ratio and multiwavelength diagnostics, their X-ray absorbing column densities (NH) are poorly known. In this analysis, (1) we study X-ray emission at >10 keV, where X-rays from the central black hole are relatively unabsorbed, in order to better constrain NH. (2) We further characterize the physical properties of the sources through broad-band near-UV to mid-IR spectral energy distribution analyses. One of the quasars is detected with NuSTAR at >8 keV with a no-source probability of

AB - We present NuSTAR hard X-ray observations of three Type 2 quasars at z ≈ 0.4-0.5, optically selected from the Sloan Digital Sky Survey. Although the quasars show evidence for being heavily obscured, Compton-thick systems on the basis of the 2-10 keV to [O III] luminosity ratio and multiwavelength diagnostics, their X-ray absorbing column densities (NH) are poorly known. In this analysis, (1) we study X-ray emission at >10 keV, where X-rays from the central black hole are relatively unabsorbed, in order to better constrain NH. (2) We further characterize the physical properties of the sources through broad-band near-UV to mid-IR spectral energy distribution analyses. One of the quasars is detected with NuSTAR at >8 keV with a no-source probability of

U2 - 10.1088/0004-637X/785/1/17

DO - 10.1088/0004-637X/785/1/17

M3 - Journal article

SN - 0004-637X

VL - 785

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 17

ER -

NuSTAR observations of heavily obscured quasars at z ~ 0.5

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