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3. The NuSTAR Extragalactic Surveys: The Number Counts Of Active Galactic Nuclei And The Resolved Fraction Of The Cosmic X-ray Background

Author

Harrison, F. A, Aird, J, Civano, F, Lansbury, G, Mullaney, J. R, Ballentyne, D. R, Alexander, D. M, Stern, D, Ajello, M, Barret, D, Bauer, F. E, Balokovic, M, Brandt, W. N, Brightman, M, Boggs, S. E, Christensen, F. E, Comastri, A, Craig, W. W, Del Moro, A, Forster, K, Gandhi, P, Giommi, P, Grefenstette, B. W, Hailey, C. J, Hickox, R. C, Hornstrup, A, Kitaguchi, T, Koglin, J, Luo, B, Madsen, K. K, Mao, P. H, Miyasaka, H, Mori, K, Perri, M, Pivovaroff, M, Puccetti, S, Rana, V, Treister, E, Walton, D, Westergaard, N. J, Wik, D, Zappacosta, L, Zhang, W. W, and Zoglauer, A

Subjects
Astrophysics
Abstract

We present the 3-8 kiloelectronvolts and 8-24 kiloelectronvolts number counts of active galactic nuclei (AGNs) identified in the Nuclear Spectroscopic Telescope Array (NuSTAR) extragalactic surveys. NuSTAR has now resolved 33 percent -39 percent of the X-ray background in the 8-24 kiloelectronvolts band, directly identifying AGNs with obscuring columns up to approximately 10 (exp 25) per square centimeter. In the softer 3-8 kiloelectronvolts band the number counts are in general agreement with those measured by XMM-Newton and Chandra over the flux range 5 times 10 (exp -15) less than or approximately equal to S (3-8 kiloelectronvolts) divided by ergs per second per square centimeter less than or approximately equal to 10 (exp -12) probed by NuSTAR. In the hard 8-24 kiloelectronvolts band NuSTAR probes fluxes over the range 2 times 10 (exp -14) less than or approximately equal to S (8-24 kiloelectronvolts) divided by ergs per second per square centimeter less than or approximately equal to 10 (exp -12), a factor approximately 100 times fainter than previous measurements. The 8-24 kiloelectronvolts number counts match predictions from AGN population synthesis models, directly confirming the existence of a population of obscured and/or hard X-ray sources inferred from the shape of the integrated cosmic X-ray background. The measured NuSTAR counts lie significantly above simple extrapolation with a Euclidian slope to low flux of the Swift/BAT15-55 kiloelectronvolts number counts measured at higher fluxes (S (15-55 kiloelectronvolts) less than or approximately equal to 10 (exp -11) ergs per second per square centimeter), reflecting the evolution of the AGN population between the Swift/BAT local (redshift is less than 0.1) sample and NuSTAR's redshift approximately equal to 1 sample. CXB (Cosmic X-ray Background) synthesis models, which account for AGN evolution, lie above the Swift/BAT measurements, suggesting that they do not fully capture the evolution of obscured AGNs at low redshifts

Published
2016
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5. NuSTAR Observations of Heavily Obscured Quasars at z Is Approximately 0.5

Author

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

Subjects
Astrophysics
Abstract

We present NuSTAR hard X-ray observations of three Type 2 quasars at z approx. = 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(sub III)] luminosity ratio and multiwavelength diagnostics, their X-ray absorbing column densities (N(sub H)) are poorly known. In this analysis, (1) we study X-ray emission at greater than 10 keV, where X-rays from the central black hole are relatively unabsorbed, in order to better constrain N(sub H). (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 greater than 8 keV with a no-source probability of less than 0.1%, and its X-ray band ratio suggests near Compton-thick absorption with N(sub H) is approximately greater than 5 × 10(exp 23) cm(exp -2). The other two quasars are undetected, and have low X-ray to mid-IR luminosity ratios in both the low-energy (2-10 keV) and high-energy (10-40 keV) X-ray regimes that are consistent with extreme, Compton-thick absorption (N(sub H) is approximately greater than 10(exp 24) cm(exp −2)). We find that for quasars at z is approximately 0.5, NuSTAR provides a significant improvement compared to lower energy (less than 10 keV) Chandra and XMM-Newton observations alone, as higher column densities can now be directly constrained.

Published
2014
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6. The NuSTAR Extragalactic Survey: A First Sensitive Look at the High-Energy Cosmic X-Ray Background Population

Author

Alexander, D. M, Stern, D, DelMoro, 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, F, Cosmastri, A, Craig, W. W, Elvis, M, Grefenstette, B. W, Hailey, C. J, Harrison, F. A, Hickox, R. C, Luo, B, Madsen, K. K, Zhang, W. W, and Eisenhardt, P. R. M

Subjects
Astronomy, Astrophysics
Abstract

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 approximately greater than 10 keV. We find that these NuSTAR-detected sources are approximately 100 times fainter than those previously detected at approximately greater than 10 keV and have a broad range in redshift and luminosity (z = 0.020-2.923 and L(sub 10-40 keV) approximately equals 4 × 10(exp 41) - 5 × 10(exp 45) erg per second; the median redshift and luminosity are z approximately equal to 0.7 and L(sub 10-40 keV) approximately equal to 3 × 10(exp 44) erg per second, respectively. We characterize these sources on the basis of broad-band approximately equal to 0.5 - 32 keV spectroscopy, optical spectroscopy, and broad-band ultraviolet-to-mid-infrared spectral energy distribution analyses. We find that the dominant source population is quasars with L(sub 10-40 keV) greater than 10(exp 44) erg per second, of which approximately 50% are obscured with N(sub H) approximately greater than 10(exp 22) per square centimeters. However, none of the 10 NuSTAR sources are Compton thick (N(sub H) approximately greater than 10(exp 24) per square centimeters) and we place a 90% confidence upper limit on the fraction of Compton-thick quasars (L(sub 10-40 keV) greater than 10(exp 44) erg per second) selected at approximately greater than 10 keV of approximately less than 33% over the redshift range z = 0.5 - 1.1. We jointly fitted the rest-frame approximately equal to 10-40 keV data for all of the non-beamed sources with L(sub 10-40 keV) greater than 10(exp 43) erg per second to constrain the average strength of reflection; we find R less than 1.4 for gamma = 1.8, broadly consistent with that found for local active galactic nuclei (AGNs) observed at approximately greater than 10 keV. We also constrain the host-galaxy masses and find a median stellar mass of approximately 10(exp 11) solar mass, a factor approximately 5 times higher than the median stellar mass of nearby high-energy selected AGNs, which may be at least partially driven by the order of magnitude higher X-ray luminosities of the NuSTAR sources. Within the low source-statistic limitations of our study, our results suggest that the overall properties of the NuSTAR sources are broadly similar to those of nearby high-energy selected AGNs but scaled up in luminosity and mass.

Published
2013
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7. Weak Hard X-Ray Emission from Two Broad Absorption Line Quasars Observed with NuStar: Compton-Thick Absorption or Intrinsic X-Ray Weakness?

Author

Luo, B, Brandt, W. N, Alexander, D. M, Harrison, F. A, Stern, D, Bauer, F. E, Boggs, S. E, Christensen, F. E, Comastri, A, Craig, W. W, Fabian, A. C, Farrah, D, Fiore, F, Fuerst, F, Grefenstette, B. W, Hailey, C. J, Hickox, R, Madsen, K. K, Matt, G, Ogle, P, Risaliti, G, Saez, C, Teng, S. H, Walton, D. J, and Zhang, W. W

Subjects
Astrophysics
Abstract

We present Nuclear Spectroscopic Telescope Array (NuSTAR) hard X-ray observations of two X-ray weak broad absorption line (BAL) quasars, PG 1004+130 (radio loud) and PG 1700+518 (radio quiet). Many BAL quasars appear X-ray weak, probably due to absorption by the shielding gas between the nucleus and the accretion-disk wind. The two targets are among the optically brightest BAL quasars, yet they are known to be significantly X-ray weak at rest-frame 2-10 keV (16-120 times fainter than typical quasars). We would expect to obtain approx. or equal to 400-600 hard X-ray (is greater than or equal to 10 keV) photons with NuSTAR, provided that these photons are not significantly absorbed N(sub H) is less than or equal to 10(exp24) cm(exp-2). However, both BAL quasars are only detected in the softer NuSTAR bands (e.g., 4-20 keV) but not in its harder bands (e.g., 20-30 keV), suggesting that either the shielding gas is highly Compton-thick or the two targets are intrinsically X-ray weak. We constrain the column densities for both to be N(sub H) 7 × 10(exp 24) cm(exp-2) if the weak hard X-ray emission is caused by obscuration from the shielding gas. We discuss a few possibilities for how PG 1004+130 could have Compton-thick shielding gas without strong Fe Kα line emission; dilution from jet-linked X-ray emission is one likely explanation. We also discuss the intrinsic X-ray weakness scenario based on a coronal-quenching model relevant to the shielding gas and disk wind of BAL quasars. Motivated by our NuSTAR results, we perform a Chandra stacking analysis with the Large Bright Quasar Survey BAL quasar sample and place statistical constraints upon the fraction of intrinsically X-ray weak BAL quasars; this fraction is likely 17%-40%.

Published
2013
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9. An Extreme X-Ray Variability Event of a Weak-line Quasar

Author

Ni, Q., primary, Brandt, W. N., additional, Yi, W., additional, Luo, B., additional, Timlin, J. D., additional, Hall, P. B., additional, Liu, Hezhen, additional, Plotkin, R. M., additional, Shemmer, O., additional, Vito, F., additional, and Wu, Jianfeng, additional

Published
2020
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10. The 4 Ms CHANDRA Deep Field-South Number Counts Apportioned by Source Class: Pervasive Active Galactic Nuclei and the Ascent of Normal Galaxies

Author

Lehmer, Bret D, Xue, Y. Q, Brandt, W. N, Alexander, D. M, Bauer, F. E, Brusa, M, Comastri, A, Gilli, R, Hornschemeier, A. E, Luo, B, Paolillo, M, Ptak, A, Shemmer, O, Schneider, D. P, Tozzi, P, and Vignali, C

Subjects
Astronomy
Abstract

We present 0.5-2 keV, 2-8 keV, 4-8 keV, and 0.5-8 keV (hereafter soft, hard, ultra-hard, and full bands, respectively) cumulative and differential number-count (log N-log S ) measurements for the recently completed approx. equal to 4 Ms Chandra Deep Field-South (CDF-S) survey, the deepest X-ray survey to date. We implement a new Bayesian approach, which allows reliable calculation of number counts down to flux limits that are factors of approx. equal to 1.9-4.3 times fainter than the previously deepest number-count investigations. In the soft band (SB), the most sensitive bandpass in our analysis, the approx. equal to 4 Ms CDF-S reaches a maximum source density of approx. equal to 27,800 deg(sup -2). By virtue of the exquisite X-ray and multiwavelength data available in the CDF-S, we are able to measure the number counts from a variety of source populations (active galactic nuclei (AGNs), normal galaxies, and Galactic stars) and subpopulations (as a function of redshift, AGN absorption, luminosity, and galaxy morphology) and test models that describe their evolution. We find that AGNs still dominate the X-ray number counts down to the faintest flux levels for all bands and reach a limiting SB source density of approx. equal to 14,900 deg(sup -2), the highest reliable AGN source density measured at any wavelength. We find that the normal-galaxy counts rise rapidly near the flux limits and, at the limiting SB flux, reach source densities of approx. equal to 12,700 deg(sup -2) and make up 46% plus or minus 5% of the total number counts. The rapid rise of the galaxy counts toward faint fluxes, as well as significant normal-galaxy contributions to the overall number counts, indicates that normal galaxies will overtake AGNs just below the approx. equal to 4 Ms SB flux limit and will provide a numerically significant new X-ray source population in future surveys that reach below the approx. equal to 4 Ms sensitivity limit. We show that a future approx. equal to 10 Ms CDF-S would allow for a significant increase in X-ray-detected sources, with many of the new sources being cosmologically distant (z greater than or approx. equal to 0.6) normal galaxies.

Published
2012
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12. Variability-selected Low-luminosity Active Galactic Nuclei Candidates in the 7 Ms Chandra Deep Field-South

Author

Ding, N., primary, Luo, B., additional, Brandt, W. N., additional, Paolillo, M., additional, Yang, G., additional, Lehmer, B. D., additional, Shemmer, O., additional, Schneider, D. P., additional, Tozzi, P., additional, Xue, Y. Q., additional, Zheng, X. C., additional, Gu, Q. S., additional, Koekemoer, A. M., additional, Vignali, C., additional, Vito, F., additional, and Wang, J. X., additional

Published
2018
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15. Deepest View of AGN X-Ray Variability with the 7 MsChandraDeep Field-South Survey

Author

Zheng, X. C., primary, Xue, Y. Q., additional, Brandt, W. N., additional, Li, J. Y., additional, Paolillo, M., additional, Yang, G., additional, Zhu, S. F., additional, Luo, B., additional, Sun, M. Y., additional, Hughes, T. M., additional, Bauer, F. E., additional, Vito, F., additional, Wang, J. X., additional, Liu, T., additional, Vignali, C., additional, and Shu, X. W., additional

Published
2017
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16. TheNuSTARExtragalactic Survey: Average Broadband X-Ray Spectral Properties of theNuSTAR-detected AGNs

Author

Del Moro, A., primary, Alexander, D. M., additional, Aird, J. A., additional, Bauer, F. E., additional, Civano, F., additional, Mullaney, J. R., additional, Ballantyne, D. R., additional, Brandt, W. N., additional, Comastri, A., additional, Gandhi, P., additional, Harrison, F. A., additional, Lansbury, G. B., additional, Lanz, L., additional, Luo, B., additional, Marchesi, S., additional, Puccetti, S., additional, Ricci, C., additional, Saez, C., additional, Stern, D., additional, Treister, E., additional, and Zappacosta, L., additional

Published
2017
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17. Black Hole Growth Is Mainly Linked to Host-galaxy Stellar Mass Rather Than Star Formation Rate

Author

Yang, G., primary, Chen, C.-T. J., additional, Vito, F., additional, Brandt, W. N., additional, Alexander, D. M., additional, Luo, B., additional, Sun, M. Y., additional, Xue, Y. Q., additional, Bauer, F. E., additional, Koekemoer, A. M., additional, Lehmer, B. D., additional, Liu, T., additional, Schneider, D. P., additional, Shemmer, O., additional, Trump, J. R., additional, Vignali, C., additional, and Wang, J.-X., additional

Published
2017
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19. Hard X-Ray-selected AGNs in Low-mass Galaxies from the NuSTAR Serendipitous Survey

Author

Chen (陳建廷), C.-T. J., primary, Brandt, W. N., additional, Reines, A. E., additional, Lansbury, G., additional, Stern, D., additional, Alexander, D. M., additional, Bauer, F., additional, Moro, A. Del, additional, Gandhi, P., additional, Harrison, F. A., additional, Hickox, R. C., additional, Koss, M. J., additional, Lanz, L., additional, Luo, B., additional, Mullaney, J. R., additional, Ricci, C., additional, and Trump, J. R., additional

Published
2017
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20. THENuSTAREXTRAGALACTIC SURVEYS: THE NUMBER COUNTS OF ACTIVE GALACTIC NUCLEI AND THE RESOLVED FRACTION OF THE COSMIC X-RAY BACKGROUND

Author

Harrison, F. A., primary, Aird, J., additional, Civano, F., additional, Lansbury, G., additional, Mullaney, J. R., additional, Ballantyne, D. R., additional, Alexander, D. M., additional, Stern, D., additional, Ajello, M., additional, Barret, D., additional, Bauer, F. E., additional, Baloković, M., additional, Brandt, W. N., additional, Brightman, M., additional, Boggs, S. E., additional, Christensen, F. E., additional, Comastri, A., additional, Craig, W. W., additional, Moro, A. Del, additional, Forster, K., additional, Gandhi, P., additional, Giommi, P., additional, Grefenstette, B. W., additional, Hailey, C. J., additional, Hickox, R. C., additional, Hornstrup, A., additional, Kitaguchi, T., additional, Koglin, J., additional, Luo, B., additional, Madsen, K. K., additional, Mao, P. H., additional, Miyasaka, H., additional, Mori, K., additional, Perri, M., additional, Pivovaroff, M., additional, Puccetti, S., additional, Rana, V., additional, Treister, E., additional, Walton, D., additional, Westergaard, N. J., additional, Wik, D., additional, Zappacosta, L., additional, Zhang, W. W., additional, and Zoglauer, A., additional

Published
2016
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21. LONG-TERM X-RAY VARIABILITY OF TYPICAL ACTIVE GALACTIC NUCLEI IN THE DISTANT UNIVERSE

Author

Yang, G., primary, Brandt, W. N., additional, Luo, B., additional, Xue, Y. Q., additional, Bauer, F. E., additional, Sun, M. Y., additional, Kim, S., additional, Schulze, S., additional, Zheng, X. C., additional, Paolillo, M., additional, Shemmer, O., additional, Liu, T., additional, Schneider, D. P., additional, Vignali, C., additional, Vito, F., additional, and Wang, J.-X., additional

Published
2016
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22. THE EVOLUTION OF NORMAL GALAXY X-RAY EMISSION THROUGH COSMIC HISTORY: CONSTRAINTS FROM THE 6 MSCHANDRADEEP FIELD-SOUTH

Author

Lehmer, B. D., primary, Basu-Zych, A. R., additional, Mineo, S., additional, Brandt, W. N., additional, Eufrasio, R. T., additional, Fragos, T., additional, Hornschemeier, A. E., additional, Luo, B., additional, Xue, Y. Q., additional, Bauer, F. E., additional, Gilfanov, M., additional, Ranalli, P., additional, Schneider, D. P., additional, Shemmer, O., additional, Tozzi, P., additional, Trump, J. R., additional, Vignali, C., additional, Wang, J.-X., additional, Yukita, M., additional, and Zezas, A., additional

Published
2016
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23. THENuSTAREXTRAGALACTIC SURVEY: FIRST DIRECT MEASUREMENTS OF THE ≳10 keV X-RAY LUMINOSITY FUNCTION FOR ACTIVE GALACTIC NUCLEI ATz> 0.1

Author

Aird, J., primary, Alexander, D. M., additional, Ballantyne, D. R., additional, Civano, F., additional, Del-Moro, A., additional, Hickox, R. C., additional, Lansbury, G. B., additional, Mullaney, J. R., additional, Bauer, F. E., additional, Brandt, W. N., additional, Comastri, A., additional, Fabian, A. C., additional, Gandhi, P., additional, Harrison, F. A., additional, Luo, B., additional, Stern, D., additional, Treister, E., additional, Zappacosta, L., additional, Ajello, M., additional, Assef, R., additional, Baloković, M., additional, Boggs, S. E., additional, Brightman, M., additional, Christensen, F. E., additional, Craig, W. W., additional, Elvis, M., additional, Forster, K., additional, Grefenstette, B. W., additional, Hailey, C. J., additional, Koss, M., additional, LaMassa, S. M., additional, Madsen, K. K., additional, Puccetti, S., additional, Saez, C., additional, Urry, C. M., additional, Wik, D. R., additional, and Zhang, W., additional

Published
2015
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24. NuSTARREVEALS EXTREME ABSORPTION INz< 0.5 TYPE 2 QUASARS

Author

Lansbury, G. B., primary, Gandhi, P., additional, Alexander, D. M., additional, Assef, R. J., additional, Aird, J., additional, Annuar, A., additional, Ballantyne, D. R., additional, Baloković, M., additional, Bauer, F. E., additional, Boggs, S. E., additional, Brandt, W. N., additional, Brightman, M., additional, Christensen, F. E., additional, Civano, F., additional, Comastri, A., additional, Craig, W. W., additional, Del Moro, A., additional, Grefenstette, B. W., additional, Hailey, C. J., additional, Harrison, F. A., additional, Hickox, R. C., additional, Koss, M., additional, LaMassa, S. M., additional, Luo, B., additional, Puccetti, S., additional, Stern, D., additional, Treister, E., additional, Vignali, C., additional, Zappacosta, L., additional, and Zhang, W. W., additional

Published
2015
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25. THENuSTAREXTRAGALACTIC SURVEYS: INITIAL RESULTS AND CATALOG FROM THE EXTENDEDCHANDRADEEP FIELD SOUTH

Author

Mullaney, J. R., primary, Del-Moro, A., additional, Aird, J., additional, Alexander, D. M., additional, Civano, F. M., additional, Hickox, R. C., additional, Lansbury, G. B., additional, Ajello, M., additional, Assef, R., additional, Ballantyne, D. R., additional, Balokovic´, M., additional, Bauer, F. E., additional, Brandt, W. N., additional, Boggs, S. E., additional, Brightman, M., additional, Christensen, F. E., additional, Comastri, A., additional, Craig, W. W., additional, Elvis, M., additional, Forster, K., additional, Gandhi, P., additional, Grefenstette, B. W., additional, Hailey, C. J., additional, Harrison, F. A., additional, Koss, M., additional, LaMassa, S. M., additional, Luo, B., additional, Madsen, K. K., additional, Puccetti, S., additional, Saez, C., additional, Stern, D., additional, Treister, E., additional, Urry, C. M., additional, Wik, D. R., additional, Zappacosta, L., additional, and Zhang, W., additional

Published
2015
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26. THENuSTAREXTRAGALACTIC SURVEYS: OVERVIEW AND CATALOG FROM THE COSMOS FIELD

Author

Civano, F., primary, Hickox, R. C., additional, Puccetti, S., additional, Comastri, A., additional, Mullaney, J. R., additional, Zappacosta, L., additional, LaMassa, S. M., additional, Aird, J., additional, Alexander, D. M., additional, Ballantyne, D. R., additional, Bauer, F. E., additional, Brandt, W. N., additional, Boggs, S. E., additional, Christensen, F. E., additional, Craig, W. W., additional, Del-Moro, A., additional, Elvis, M., additional, Forster, K., additional, Gandhi, P., additional, Grefenstette, B. W., additional, Hailey, C. J., additional, Harrison, F. A., additional, Lansbury, G. B., additional, Luo, B., additional, Madsen, K., additional, Saez, C., additional, Stern, D., additional, Treister, E., additional, Urry, M. C., additional, Wik, D. R., additional, and Zhang, W., additional

Published
2015
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27. BROADBAND OBSERVATIONS OF THE COMPTON-THICK NUCLEUS OF NGC 3393

Author

Koss, Michael J., primary, Romero-Cañizales, C., additional, Baronchelli, L., additional, Teng, S. H., additional, Baloković, M., additional, Puccetti, S., additional, Bauer, F. E., additional, Arévalo, P., additional, Assef, R., additional, Ballantyne, D. R., additional, Brandt, W. N., additional, Brightman, M., additional, Comastri, A., additional, Gandhi, P., additional, Harrison, F. A., additional, Luo, B., additional, Schawinski, K., additional, Stern, D., additional, and Treister, E., additional

Published
2015
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29. X-RAY INSIGHTS INTO THE NATURE OF PHL 1811 ANALOGS AND WEAK EMISSION-LINE QUASARS: UNIFICATION WITH A GEOMETRICALLY THICK ACCRETION DISK?

Author

Luo, B., primary, Brandt, W. N., additional, Hall, P. B., additional, Wu, Jianfeng, additional, Anderson, S. F., additional, Garmire, G. P., additional, Gibson, R. R., additional, Plotkin, R. M., additional, Richards, G. T., additional, Schneider, D. P., additional, Shemmer, O., additional, and Shen, Yue, additional

Published
2015
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31. ERRATUM: “NuSTAR UNVEILS A COMPTON-THICK TYPE 2 QUASAR IN MrK 34” (2014, ApJ, 792, 117)

Author

Gandhi, P., primary, Lansbury, G. B., additional, Alexander, D. M., additional, Stern, D., additional, Arévalo, P., additional, Ballantyne, D. R., additional, Baloković, M., additional, Bauer, F. E., additional, Boggs, S. E., additional, Brandt, W. N., additional, Brightman, M., additional, Christensen, F. E., additional, Comastri, A., additional, Craig, W. W., additional, Del Moro, A., additional, Elvis, M., additional, Fabian, A. C., additional, Hailey, C. J., additional, Harrison, F. A., additional, Hickox, R. C., additional, Koss, M., additional, LaMassa, S. M., additional, Luo, B., additional, Madejski, G. M., additional, Ptak, A. F., additional, Puccetti, S., additional, Teng, S. H., additional, Urry, C. M., additional, Walton, D. J., additional, and Zhang, W. W., additional

Published
2014
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32. THENuSTARVIEW OF NEARBY COMPTON-THICK ACTIVE GALACTIC NUCLEI: THE CASES OF NGC 424, NGC 1320, AND IC 2560

Author

Baloković, M., primary, Comastri, A., additional, Harrison, F. A., additional, Alexander, D. M., additional, Ballantyne, D. R., additional, Bauer, F. E., additional, Boggs, S. E., additional, Brandt, W. N., additional, Brightman, M., additional, Christensen, F. E., additional, Craig, W. W., additional, Moro, A. Del, additional, Gandhi, P., additional, Hailey, C. J., additional, Koss, M., additional, Lansbury, G. B., additional, Luo, B., additional, Madejski, G. M., additional, Marinucci, A., additional, Matt, G., additional, Markwardt, C. B., additional, Puccetti, S., additional, Reynolds, C. S., additional, Risaliti, G., additional, Rivers, E., additional, Stern, D., additional, Walton, D. J., additional, and Zhang, W. W., additional

Published
2014
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33. NuSTARANDXMM-NEWTONOBSERVATIONS OF LUMINOUS, HEAVILY OBSCURED,WISE-SELECTED QUASARS ATZ∼ 2

Author

Stern, D., primary, Lansbury, G. B., additional, Assef, R. J., additional, Brandt, W. N., additional, Alexander, D. M., additional, Ballantyne, D. R., additional, Baloković, M., additional, Bauer, F. E., additional, Benford, D., additional, Blain, A., additional, Boggs, S. E., additional, Bridge, C., additional, Brightman, M., additional, Christensen, F. E., additional, Comastri, A., additional, Craig, W. W., additional, Del Moro, A., additional, Eisenhardt, P. R. M., additional, Gandhi, P., additional, Griffith, R. L., additional, Hailey, C. J., additional, Harrison, F. A., additional, Hickox, R. C., additional, Jarrett, T. H., additional, Koss, M., additional, Lake, S., additional, LaMassa, S. M., additional, Luo, B., additional, Tsai, C.-W., additional, Urry, C. M., additional, Walton, D. J., additional, Wright, E. L., additional, Wu, J., additional, Yan, L., additional, and Zhang, W. W., additional

Published
2014
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34. WEAK HARD X-RAY EMISSION FROM BROAD ABSORPTION LINE QUASARS: EVIDENCE FOR INTRINSIC X-RAY WEAKNESS

Author

Luo, B., primary, Brandt, W. N., additional, Alexander, D. M., additional, Stern, D., additional, Teng, S. H., additional, Arévalo, P., additional, Bauer, F. E., additional, Boggs, S. E., additional, Christensen, F. E., additional, Comastri, A., additional, Craig, W. W., additional, Farrah, D., additional, Gandhi, P., additional, Hailey, C. J., additional, Harrison, F. A., additional, Koss, M., additional, Ogle, P., additional, Puccetti, S., additional, Saez, C., additional, Scott, A. E., additional, Walton, D. J., additional, and Zhang, W. W., additional

Published
2014
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35. NuSTAR UNVEILS A COMPTON-THICK TYPE 2 QUASAR IN MrK 34

Author

Gandhi, P., primary, Lansbury, G. B., additional, Alexander, D. M., additional, Stern, D., additional, Arévalo, P., additional, Ballantyne, D. R., additional, Baloković, M., additional, Bauer, F. E., additional, Boggs, S. E., additional, Brandt, W. N., additional, Brightman, M., additional, Christensen, F. E., additional, Comastri, A., additional, Craig, W. W., additional, Del Moro, A., additional, Elvis, M., additional, Fabian, A. C., additional, Hailey, C. J., additional, Harrison, F. A., additional, Hickox, R. C., additional, Koss, M., additional, LaMassa, S. M., additional, Luo, B., additional, Madejski, G. M., additional, Ptak, A. F., additional, Puccetti, S., additional, Teng, S. H., additional, Urry, C. M., additional, Walton, D. J., additional, and Zhang, W. W., additional

Published
2014
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36. THE 2-79 keV X-RAY SPECTRUM OF THE CIRCINUS GALAXY WITHNuSTAR,XMM-Newton, ANDCHANDRA: A FULLY COMPTON-THICK ACTIVE GALACTIC NUCLEUS

Author

Arévalo, P., primary, Bauer, F. E., additional, Puccetti, S., additional, Walton, D. J., additional, Koss, M., additional, Boggs, S. E., additional, Brandt, W. N., additional, Brightman, M., additional, Christensen, F. E., additional, Comastri, A., additional, Craig, W. W., additional, Fuerst, F., additional, Gandhi, P., additional, Grefenstette, B. W., additional, Hailey, C. J., additional, Harrison, F. A., additional, Luo, B., additional, Madejski, G., additional, Madsen, K. K., additional, Marinucci, A., additional, Matt, G., additional, Saez, C., additional, Stern, D., additional, Stuhlinger, M., additional, Treister, E., additional, Urry, C. M., additional, and Zhang, W. W., additional

Published
2014
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37. NuSTARANDXMM-NEWTONOBSERVATIONS OF NGC 1365: EXTREME ABSORPTION VARIABILITY AND A CONSTANT INNER ACCRETION DISK

Author

Walton, D. J., primary, Risaliti, G., additional, Harrison, F. A., additional, Fabian, A. C., additional, Miller, J. M., additional, Arevalo, P., additional, Ballantyne, D. R., additional, Boggs, S. E., additional, Brenneman, L. W., additional, Christensen, F. E., additional, Craig, W. W., additional, Elvis, M., additional, Fuerst, F., additional, Gandhi, P., additional, Grefenstette, B. W., additional, Hailey, C. J., additional, Kara, E., additional, Luo, B., additional, Madsen, K. K., additional, Marinucci, A., additional, Matt, G., additional, Parker, M. L., additional, Reynolds, C. S., additional, Rivers, E., additional, Ross, R. R., additional, Stern, D., additional, and Zhang, W. W., additional

Published
2014
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38. NuSTAR J033202–2746.8: DIRECT CONSTRAINTS ON THE COMPTON REFLECTION IN A HEAVILY OBSCURED QUASAR AT z ≈ 2

Author

Del Moro, A., primary, Mullaney, J. R., additional, Alexander, D. M., additional, Comastri, A., additional, Bauer, F. E., additional, Treister, E., additional, Stern, D., additional, Civano, F., additional, Ranalli, P., additional, Vignali, C., additional, Aird, J. A., additional, Ballantyne, D. R., additional, Baloković, M., additional, Boggs, S. E., additional, Brandt, W. N., additional, Christensen, F. E., additional, Craig, W. W., additional, Gandhi, P., additional, Gilli, R., additional, Hailey, C. J., additional, Harrison, F. A., additional, Hickox, R. C., additional, LaMassa, S. M., additional, Lansbury, G. B., additional, Luo, B., additional, Puccetti, S., additional, Urry, M., additional, and Zhang, W. W., additional

Published
2014
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39. NuSTARREVEALS AN INTRINSICALLY X-RAY WEAK BROAD ABSORPTION LINE QUASAR IN THE ULTRALUMINOUS INFRARED GALAXY MARKARIAN 231

Author

Teng, Stacy H., primary, Brandt, W. N., additional, Harrison, F. A., additional, Luo, B., additional, Alexander, D. M., additional, Bauer, F. E., additional, Boggs, S. E., additional, Christensen, F. E., additional, Comastri, A., additional, Craig, W. W., additional, Fabian, A. C., additional, Farrah, D., additional, Fiore, F., additional, Gandhi, P., additional, Grefenstette, B. W., additional, Hailey, C. J., additional, Hickox, R. C., additional, Madsen, K. K., additional, Ptak, A. F., additional, Rigby, J. R., additional, Risaliti, G., additional, Saez, C., additional, Stern, D., additional, Veilleux, S., additional, Walton, D. J., additional, Wik, D. R., additional, and Zhang, W. W., additional

Published
2014
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40. NuSTAROBSERVATIONS OF HEAVILY OBSCURED QUASARS ATz∼ 0.5

Author

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

Published
2014
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43. AN ALMA SURVEY OF SUBMILLIMETER GALAXIES IN THE EXTENDED CHANDRA DEEP FIELD-SOUTH: THE AGN FRACTION AND X-RAY PROPERTIES OF SUBMILLIMETER GALAXIES

Author

Wang, S. X., primary, Brandt, W. N., additional, Luo, B., additional, Smail, I., additional, Alexander, D. M., additional, Danielson, A. L. R., additional, Hodge, J. A., additional, Karim, A., additional, Lehmer, B. D., additional, Simpson, J. M., additional, Swinbank, A. M., additional, Walter, F., additional, Wardlow, J. L., additional, Xue, Y. Q., additional, Chapman, S. C., additional, Coppin, K. E. K., additional, Dannerbauer, H., additional, De Breuck, C., additional, Menten, K. M., additional, and van der Werf, P., additional

Published
2013
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45. THENuSTAREXTRAGALACTIC SURVEY: A FIRST SENSITIVE LOOK AT THE HIGH-ENERGY COSMIC X-RAY BACKGROUND POPULATION

Author

Alexander, D. M., primary, Stern, D., additional, Del Moro, A., additional, Lansbury, G. B., additional, Assef, R. J., additional, Aird, J., additional, Ajello, M., additional, Ballantyne, D. R., additional, Bauer, F. E., additional, Boggs, S. E., additional, Brandt, W. N., additional, Christensen, F. E., additional, Civano, F., additional, Comastri, A., additional, Craig, W. W., additional, Elvis, M., additional, Grefenstette, B. W., additional, Hailey, C. J., additional, Harrison, F. A., additional, Hickox, R. C., additional, Luo, B., additional, Madsen, K. K., additional, Mullaney, J. R., additional, Perri, M., additional, Puccetti, S., additional, Saez, C., additional, Treister, E., additional, Urry, C. M., additional, Zhang, W. W., additional, Bridge, C. R., additional, Eisenhardt, P. R. M., additional, Gonzalez, A. H., additional, Miller, S. H., additional, and Tsai, C. W., additional

Published
2013
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47. WEAK HARD X-RAY EMISSION FROM TWO BROAD ABSORPTION LINE QUASARS OBSERVED WITHNuSTAR: COMPTON-THICK ABSORPTION OR INTRINSIC X-RAY WEAKNESS?

Author

Luo, B., primary, Brandt, W. N., additional, Alexander, D. M., additional, Harrison, F. A., additional, Stern, D., additional, Bauer, F. E., additional, Boggs, S. E., additional, Christensen, F. E., additional, Comastri, A., additional, Craig, W. W., additional, Fabian, A. C., additional, Farrah, D., additional, Fiore, F., additional, Fuerst, F., additional, Grefenstette, B. W., additional, Hailey, C. J., additional, Hickox, R., additional, Madsen, K. K., additional, Matt, G., additional, Ogle, P., additional, Risaliti, G., additional, Saez, C., additional, Teng, S. H., additional, Walton, D. J., additional, and Zhang, W. W., additional

Published
2013
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50. THE 4 MsCHANDRADEEP FIELD-SOUTH NUMBER COUNTS APPORTIONED BY SOURCE CLASS: PERVASIVE ACTIVE GALACTIC NUCLEI AND THE ASCENT OF NORMAL GALAXIES

Author

Lehmer, B. D., primary, Xue, Y. Q., additional, Brandt, W. N., additional, Alexander, D. M., additional, Bauer, F. E., additional, Brusa, M., additional, Comastri, A., additional, Gilli, R., additional, Hornschemeier, A. E., additional, Luo, B., additional, Paolillo, M., additional, Ptak, A., additional, Shemmer, O., additional, Schneider, D. P., additional, Tozzi, P., additional, and Vignali, C., additional

Published
2012
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