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Browsing by Author "Ballantyne, D. R."

Browsing by Author "Ballantyne, D. R."

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  • The Broad-band X-Ray Spectrum of IC 4329A from a Joint NuSTAR/Suzaku Observation 
    Brenneman, L. W.; Madejski, G.; Fuerst, F.; Matt, G.; Elvis, M.; Harrison, F. A.; Ballantyne, D. R.; Boggs, S. E.; Christensen, F. E.; Craig, W. W.; Fabian, A. C.; Grefenstette, B. W.; Hailey, C. J.; Madsen, K. K.; Marinucci, A.; Rivers, E.; Stern, D.; Walton, D. J.; Zhang, W. W. (2014)
    We have obtained a deep, simultaneous observation of the bright, nearby Seyfert galaxy IC 4329A with Suzaku and NuSTAR. Through a detailed spectral analysis, we are able to robustly separate the continuum, absorption, and ...
  • The Broadband Spectral Variability of MCG-6-30-15 Observed by NuSTAR and XMM-Newton 
    Marinucci, A.; Matt, G.; Miniutti, G.; Guainazzi, M.; Parker, M. L.; Brenneman, L.; Fabian, A. C.; Kara, E.; Arevalo, P.; Ballantyne, D. R.; Boggs, S. E.; Cappi, M.; Christensen, F. E.; Craig, W. W.; Elvis, M.; Hailey, C. J.; Harrison, F. A.; Reynolds, C. S.; Risaliti, G.; Stern, D. K.; Walton, D. J.; Zhang, W. (2014)
    MCG-6-30-15, at a distance of 37 Mpc (z = 0.008), is the archetypical Seyfert 1 galaxy showing very broad Fe Ka emission. We present results from a joint NuSTAR and XMM-Newton observational campaign that, for the first ...
  • Erratum: "NuSTAR Unveils a Compton-thick Type 2 Quasar in MrK 34" (2014, ApJ, 792, 117) 
    Gandhi, P.; Lansbury, G. B.; Alexander, D. M.; Stern, D.; Arévalo, P.; Ballantyne, D. R.; Balokovic, Mislav; Bauer, F. E.; Boggs, S. E.; Brandt, W. N.; Brightman, M.; Christensen, F. E.; Comastri, A.; Craig, W. W.; Del Moro, A.; Elvis, M.; Fabian, A. C.; Hailey, C. J.; Harrison, F. A.; Hickox, R. C.; Koss, M.; LaMassa, S. M.; Luo, B.; Madejski, G. M.; Ptak, A. F.; Puccetti, S.; Teng, S. H.; Urry, C. M.; Walton, D. J.; Zhang, W. W. (2014)
    Not Available
  • Measuring the Coronal Properties of IC 4329A with NuSTAR 
    Brenneman, L. W.; Madejski, G.; Fuerst, F.; Matt, G.; Elvis, M.; Harrison, F. A.; Ballantyne, D. R.; Boggs, S. E.; Christensen, F. E.; Craig, W. W.; Fabian, A. C.; Grefenstette, B. W.; Hailey, C. J.; Madsen, K. K.; Marinucci, A.; Rivers, E.; Stern, D.; Walton, D. J.; Zhang, W. W. (2014)
    We present an analysis of a ~160 ks NuSTAR observation of the nearby bright Seyfert galaxy IC 4329A. The high-quality broadband spectrum enables us to separate the effects of distant reflection from the direct coronal ...
  • A New Compton-thick AGN in our Cosmic Backyard: Unveiling the Buried Nucleus in NGC 1448 with NuSTAR 
    Annuar, A.; Alexander, D. M.; Gandhi, P.; Lansbury, G. B.; Asmus, D.; Ballantyne, D. R.; Bauer, F. E.; Boggs, S. E.; Boorman, P. G.; Brandt, W. N.; Brightman, M.; Christensen, F. E.; Craig, W. W.; Farrah, D.; Goulding, A. D.; Hailey, C. J.; Harrison, F. A.; Koss, M. J.; LaMassa, S. M.; Murray, Stephen S.; Ricci, C.; Rosario, D. J.; Stanley, F.; Stern, D.; Zhang, W. (2017)
    NGC 1448 is one of the nearest luminous galaxies (L <SUB>8-1000?m</SUB> &gt; 10<SUP>9</SUP> L <SUB>?</SUB>) to ours (z = 0.00390), and yet the active galactic nucleus (AGN) it hosts was only recently discovered, in 2009. ...
  • The NuSTAR Extragalactic Surveys: X-Ray Spectroscopic Analysis of the Bright Hard-band Selected Sample 
    Zappacosta, L.; Comastri, A.; Civano, Francesca; Puccetti, S.; Fiore, F.; Aird, J.; Del Moro, A.; Lansbury, G. B.; Lanzuisi, G.; Goulding, A.; Mullaney, J. R.; Stern, D.; Ajello, M.; Alexander, D. M.; Ballantyne, D. R.; Bauer, F. E.; Brandt, W. N.; Chen, C. -T J.; Farrah, D.; Harrison, F. A.; Gandhi, P.; Lanz, L.; Masini, A.; Marchesi, S.; Ricci, C.; Treister, E. (2018)
    We discuss the spectral analysis of a sample of 63 active galactic nuclei (AGN) detected above a limiting flux of S(8{--}24 {keV})=7× {10}<SUP>-14</SUP> {erg} {{{s}}}<SUP>-1</SUP> {{cm}}<SUP>-2</SUP> in the multi-tiered ...
  • NuSTAR and Suzaku X-Ray Spectroscopy of NGC 4151: Evidence for Reflection from the Inner Accretion Disk 
    Keck, M. L.; Brenneman, L. W.; Ballantyne, D. R.; Bauer, F.; Boggs, S. E.; Christensen, F. E.; Craig, W. W.; Dauser, T.; Elvis, M.; Fabian, A. C.; Fuerst, F.; García, J.; Grefenstette, B. W.; Hailey, C. J.; Harrison, F. A.; Madejski, G.; Marinucci, A.; Matt, G.; Reynolds, C. S.; Stern, D.; Walton, D. J.; Zoghbi, A. (2015)
    We present X-ray timing and spectral analyses of simultaneous 150 ks Nuclear Spectroscopic Telescope Array (NuSTAR) and Suzaku X-ray observations of the Seyfert 1.5 galaxy NGC 4151. We disentangle the continuum emission, ...
  • NuSTAR and XMM-NEWTON Observations of NGC 1365: Extreme Absorption Variability and a Constant Inner Accretion Disk 
    Walton, D. J.; Risaliti, G.; Harrison, F. A.; Fabian, A. C.; Miller, J. M.; Arevalo, P.; Ballantyne, D. R.; Boggs, S. E.; Brenneman, L. W.; Christensen, F. E.; Craig, W. W.; Elvis, M.; Fuerst, F.; Gandhi, P.; Grefenstette, B. W.; Hailey, C. J.; Kara, E.; Luo, B.; Madsen, K. K.; Marinucci, A.; Matt, G.; Parker, M. L.; Reynolds, C. S.; Rivers, E.; Ross, R. R.; Stern, D.; Zhang, W. W. (2014)
    We present a spectral analysis of four coordinated NuSTAR+XMM-Newton observations of the Seyfert galaxy NGC 1365. These exhibit an extreme level of spectral variability, which is primarily due to variable line-of-sight ...
  • The NuSTAR Extragalactic Survey: A First Sensitive Look at the High-energy Cosmic X-Ray Background Population 
    Alexander, D. M.; Stern, D.; Del Moro, A.; Lansbury, G. B.; Assef, R. J.; Aird, J.; Ajello, M.; Ballantyne, D. R.; Bauer, F. E.; Boggs, S. E.; Brandt, W. N.; Christensen, F. E.; Civano, Francesca; Comastri, A.; Craig, W. W.; Elvis, M.; Grefenstette, B. W.; Hailey, C. J.; Harrison, F. A.; Hickox, R. C.; Luo, B.; Madsen, K. K.; Mullaney, J. R.; Perri, M.; Puccetti, S.; Saez, C.; Treister, E.; Urry, C. M.; Zhang, W. W.; Bridge, C. R.; Eisenhardt, P. R. M.; Gonzalez, A. H.; Miller, S. H.; Tsai, C. W. (2013)
    We report on the first 10 identifications of sources serendipitously detected by the Nuclear Spectroscopic Telescope Array (NuSTAR) to provide the first sensitive census of the cosmic X-ray background source population at ...
  • The NuSTAR Extragalactic Survey: Average Broadband X-Ray Spectral Properties of the NuSTAR-detected AGNs 
    Del Moro, A.; Alexander, D. M.; Aird, J. A.; Bauer, F. E.; Civano, Francesca; Mullaney, J. R.; Ballantyne, D. R.; Brandt, W. N.; Comastri, A.; Gandhi, P.; Harrison, F. A.; Lansbury, G. B.; Lanz, L.; Luo, B.; Marchesi, S.; Puccetti, S.; Ricci, C.; Saez, C.; Stern, D.; Treister, E.; Zappacosta, L. (2017)
    We present a study of the average X-ray spectral properties of the sources detected by the NuSTAR extragalactic survey, comprising observations of the Extended Chandra Deep Field South (E-CDFS), Extended Groth Strip (EGS), ...
  • The NuSTAR Extragalactic Survey: First Direct Measurements of the ?10 KeV X-Ray Luminosity Function for Active Galactic Nuclei at z&gt;0.1 
    Aird, J.; Alexander, D. M.; Ballantyne, D. R.; Civano, Francesca; Del-Moro, A.; Hickox, R. C.; Lansbury, G. B.; Mullaney, J. R.; Bauer, F. E.; Brandt, W. N.; Comastri, A.; Fabian, A. C.; Gandhi, P.; Harrison, F. A.; Luo, B.; Stern, D.; Treister, E.; Zappacosta, L.; Ajello, M.; Assef, R.; Balokovic, Mislav; Boggs, S. E.; Brightman, M.; Christensen, F. E.; Craig, W. W.; Elvis, M.; Forster, K.; Grefenstette, B. W.; Hailey, C. J.; Koss, M.; LaMassa, S. M.; Madsen, K. K.; Puccetti, S.; Saez, C.; Urry, C. M.; Wik, D. R.; Zhang, W. (2015)
    We present the first direct measurements of the rest-frame 10–40 keV X-ray luminosity function (XLF) of active galactic nuclei (AGNs) based on a sample of 94 sources at 0.1 <SUB>{{H</SUB>}}~ {10}<SUP>23-24</SUP> cm<SUP>-2</SUP> ...
  • The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South 
    Mullaney, J. R.; Del-Moro, A.; Aird, J.; Alexander, D. M.; Civano, Francesca; Hickox, R. C.; Lansbury, G. B.; Ajello, M.; Assef, R.; Ballantyne, D. R.; Balokovic, Mislav; Bauer, F. E.; Brandt, W. N.; Boggs, S. E.; Brightman, M.; Christensen, F. E.; Comastri, A.; Craig, W. W.; Elvis, M.; Forster, K.; Gandhi, P.; Grefenstette, B. W.; Hailey, C. J.; Harrison, F. A.; Koss, M.; LaMassa, S. M.; Luo, B.; Madsen, K. K.; Puccetti, S.; Saez, C.; Stern, D.; Treister, E.; Urry, C. M.; Wik, D. R.; Zappacosta, L.; Zhang, W. (2015)
    We present the initial results and the source catalog from the Nuclear Spectroscopic Telescope Array (NuSTAR) survey of the Extended Chandra Deep Field South (hereafter, ECDFS)-currently the deepest contiguous component ...
  • The Nustar Extragalactic Surveys: Overview and Catalog from the COSMOS Field 
    Civano, Francesca; Hickox, R. C.; Puccetti, S.; Comastri, A.; Mullaney, J. R.; Zappacosta, L.; LaMassa, S. M.; Aird, J.; Alexander, D. M.; Ballantyne, D. R.; Bauer, F. E.; Brandt, W. N.; Boggs, S. E.; Christensen, F. E.; Craig, W. W.; Del-Moro, A.; Elvis, M.; Forster, K.; Gandhi, P.; Grefenstette, B. W.; Hailey, C. J.; Harrison, F. A.; Lansbury, G. B.; Luo, B.; Madsen, K.; Saez, C.; Stern, D.; Treister, E.; Urry, M. C.; Wik, D. R.; Zhang, W. (2015)
    To provide the census of the sources contributing to the X-ray background peak above 10 keV, Nuclear Spectroscopic Telescope Array (NuSTAR) is performing extragalactic surveys using a three-tier "wedding cake" approach. ...
  • The NuSTAR Extragalactic Surveys: Source Catalog and the Compton-thick Fraction in the UDS Field 
    Masini, A.; Civano, Francesca; Comastri, A.; Fornasini, F.; Ballantyne, D. R.; Lansbury, G. B.; Treister, E.; Alexander, D. M.; Boorman, P. G.; Brandt, W. N.; Farrah, D.; Gandhi, P.; Harrison, F. A.; Hickox, R. C.; Kocevski, D. D.; Lanz, L.; Marchesi, S.; Puccetti, S.; Ricci, C.; Saez, C.; Stern, D.; Zappacosta, L. (2018)
    We present the results and the source catalog of the NuSTAR survey in the UKIDSS Ultra Deep Survey (UDS) field, bridging the gap in depth and area between NuSTAR's ECDFS and COSMOS surveys. The survey covers a ~0.6 ...
  • NuSTAR Observations of Heavily Obscured Quasars at z ~ 0.5 
    Lansbury, G. B.; Alexander, D. M.; Del Moro, A.; Gandhi, P.; Assef, R. J.; Stern, D.; Aird, J.; Ballantyne, D. R.; Balokovic, Mislav; 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.; Koss, M.; LaMassa, S. M.; Luo, B.; Mullaney, J. R.; Teng, S. H.; Urry, C. M.; Zhang, W. W. (2014)
    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 ...
  • NuSTAR Reveals the Comptonizing Corona of the Broad-line Radio Galaxy 3C 382 
    Ballantyne, D. R.; Bollenbacher, J. M.; Brenneman, L. W.; Madsen, K. K.; Balokovic, Mislav; Boggs, S. E.; Christensen, F. E.; Craig, W. W.; Gandhi, P.; Hailey, C. J.; Harrison, F. A.; Lohfink, A. M.; Marinucci, A.; Markwardt, C. B.; Stern, D.; Walton, D. J.; Zhang, W. W. (2014)
    Broad-line radio galaxies (BLRGs) are active galactic nuclei that produce powerful, large-scale radio jets, but appear as Seyfert 1 galaxies in their optical spectra. In the X-ray band, BLRGs also appear like Seyfert ...
  • The NuSTAR Serendipitous Survey: Hunting for the Most Extreme Obscured AGN at &gt;10 keV 
    Lansbury, G. B.; Alexander, D. M.; Aird, J.; Gandhi, P.; Stern, D.; Koss, M.; Lamperti, I.; Ajello, M.; Annuar, A.; Assef, R. J.; Ballantyne, D. R.; Balokovic, Mislav; Bauer, F. E.; Brandt, W. N.; Brightman, M.; Chen, C. -T J.; Civano, Francesca; Comastri, A.; Del Moro, A.; Fuentes, C.; Harrison, F. A.; Marchesi, S.; Masini, A.; Mullaney, J. R.; Ricci, C.; Saez, C.; Tomsick, J. A.; Treister, E.; Walton, D. J.; Zappacosta, L. (2017)
    We identify sources with extremely hard X-ray spectra (I.e., with photon indices of {{G }}? 0.6) in the 13 deg<SUP>2</SUP> NuSTAR serendipitous survey, to search for the most highly obscured active galactic nuclei (AGNs) ...
  • The NuSTAR Serendipitous Survey: The 40-month Catalog and the Properties of the Distant High-energy X-Ray Source Population 
    Lansbury, G. B.; Stern, D.; Aird, J.; Alexander, D. M.; Fuentes, C.; Harrison, F. A.; Treister, E.; Bauer, F. E.; Tomsick, J. A.; Balokovic, Mislav; Del Moro, A.; Gandhi, P.; Ajello, M.; Annuar, A.; Ballantyne, D. R.; Boggs, S. E.; Brandt, W. N.; Brightman, M.; Chen, C. -T J.; Christensen, F. E.; Civano, Francesca; Comastri, A.; Craig, W. W.; Forster, K.; Grefenstette, B. W.; Hailey, C. J.; Hickox, R. C.; Jiang, B.; Jun, H. D.; Koss, M.; Marchesi, S.; Melo, A. D.; Mullaney, J. R.; Noirot, G.; Schulze, S.; Walton, D. J.; Zappacosta, L.; Zhang, W. W. (2017)
    We present the first full catalog and science results for the Nuclear Spectroscopic Telescope Array (NuSTAR) serendipitous survey. The catalog incorporates data taken during the first 40 months of NuSTAR operation, which ...
  • NuSTAR Survey of Obscured Swift/BAT-selected Active Galactic Nuclei. II. Median High-energy Cutoff in Seyfert II Hard X-Ray Spectra 
    Balokovic, Mislav; Harrison, F. A.; Madejski, G.; Comastri, A.; Ricci, C.; Annuar, A.; Ballantyne, D. R.; Boorman, P.; Brandt, W. N.; Brightman, M.; Gandhi, P.; Kamraj, N.; Koss, M. J.; Marchesi, S.; Marinucci, A.; Masini, A.; Matt, G.; Stern, D.; Urry, C. M. (2020)
    Broadband X-ray spectroscopy of the X-ray emission produced in the coronae of active galactic nuclei (AGNs) can provide important insights into the physical conditions very close to their central supermassive black holes. ...
  • NuSTAR Unveils a Compton-thick Type 2 Quasar in Mrk 34 
    Gandhi, P.; Lansbury, G. B.; Alexander, D. M.; Stern, D.; Arévalo, P.; Ballantyne, D. R.; Balokovic, Mislav; Bauer, F. E.; Boggs, S. E.; Brandt, W. N.; Brightman, M.; Christensen, F. E.; Comastri, A.; Craig, W. W.; Del Moro, A.; Elvis, M.; Fabian, A. C.; Hailey, C. J.; Harrison, F. A.; Hickox, R. C.; Koss, M.; LaMassa, S. M.; Luo, B.; Madejski, G. M.; Ptak, A. F.; Puccetti, S.; Teng, S. H.; Urry, C. M.; Walton, D. J.; Zhang, W. W. (2014)
    We present Nuclear Spectroscopic Telescope Array (NuSTAR) 3-40 keV observations of the optically selected Type 2 quasar (QSO2) SDSS J1034+6001 or Mrk 34. The high-quality hard X-ray spectrum and archival XMM-Newton data ...

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