The NuSTAR Extragalactic Survey: Average Broadband X-Ray Spectral Properties of the NuSTAR-detected AGNs (2017)
Journal Article
Del Moro, A., Alexander, D., Aird, J., Bauer, F., Civano, F., Mullaney, J., …Zappacosta, L. (2017). The NuSTAR Extragalactic Survey: Average Broadband X-Ray Spectral Properties of the NuSTAR-detected AGNs. Astrophysical Journal, 849(1), Article 57. https://doi.org/10.3847/1538-4357/aa9115

We present a study of the average X-ray spectral properties of the sources detected by the NuSTAR extragalactic survey, comprising observations of the E-CDFS, EGS and COSMOS fields. The sample includes 182 NuSTAR sources (64 detected at 8-24 keV), wi... Read More about The NuSTAR Extragalactic Survey: Average Broadband X-Ray Spectral Properties of the NuSTAR-detected AGNs.

The NuSTAR Serendipitous Survey: Hunting for the Most Extreme Obscured AGN at >10 keV (2017)
Journal Article
Lansbury, G., Alexander, D., Aird, J., Gandhi, P., Stern, D., Koss, M., …Zappacosta, L. (2017). The NuSTAR Serendipitous Survey: Hunting for the Most Extreme Obscured AGN at >10 keV. Astrophysical Journal, 846(1), Article 20. https://doi.org/10.3847/1538-4357/aa8176

We identify sources with extremely hard X-ray spectra (i.e., with photon indices of ${\rm{\Gamma }}\lesssim 0.6$) in the 13 deg2 NuSTAR serendipitous survey, to search for the most highly obscured active galactic nuclei (AGNs) detected at $\gt 10\,\m... Read More about The NuSTAR Serendipitous Survey: Hunting for the Most Extreme Obscured AGN at >10 keV.

A variable ULX and possible IMBH candidate in M51a (2016)
Journal Article
Earnshaw, H. M., Roberts, T. P., Heil, L. M., Mezcua, M., Walton, D. J., Done, C., …Sutton, A. D. (2016). A variable ULX and possible IMBH candidate in M51a. Monthly Notices of the Royal Astronomical Society, 456(4), 3840-3854. https://doi.org/10.1093/mnras/stv2945

Ultraluminous X-ray source (ULX)-7, in the northern spiral arm of M51, demonstrates unusual behaviour for an ULX, with a hard X-ray spectrum but very high short-term variability. This suggests that it is not in a typical ultraluminous state. We analy... Read More about A variable ULX and possible IMBH candidate in M51a.

NuSTAR Reveals Extreme Absorption in z < 0.5 Type 2 Quasars (2015)
Journal Article
Lansbury, G., Gandhi, P., Alexander, D., Assef, R., Aird, J., Annuar, A., …Zhang, W. (2015). NuSTAR Reveals Extreme Absorption in z < 0.5 Type 2 Quasars. Astrophysical Journal, 809(2), Article 115. https://doi.org/10.1088/0004-637x/809/2/115

The intrinsic column density (NH) distribution of quasars is poorly known. At the high obscuration end of the quasar population and for redshifts z 1.5e24 cm^-2) type 2 quasars (CTQSO2s); five new NuSTAR observations are reported herein, and four hav... Read More about NuSTAR Reveals Extreme Absorption in z < 0.5 Type 2 Quasars.

The NuSTAR View of Nearby Compton-thick Active Galactic Nuclei: The Cases of NGC 424, NGC 1320, and IC 2560 (2014)
Journal Article
Baloković, M., Comastri, A., Harrison, F., Alexander, D., Ballantyne, D., Bauer, F., …Zhang, W. (2014). The NuSTAR View of Nearby Compton-thick Active Galactic Nuclei: The Cases of NGC 424, NGC 1320, and IC 2560. Astrophysical Journal, 794(2), Article 111. https://doi.org/10.1088/0004-637x/794/2/111

We present X-ray spectral analyses for three Seyfert 2 active galactic nuclei (AGNs), NGC 424, NGC 1320, and IC 2560, observed by NuSTAR in the 3-79 keV band. The high quality hard X-ray spectra allow detailed modeling of the Compton reflection compo... Read More about The NuSTAR View of Nearby Compton-thick Active Galactic Nuclei: The Cases of NGC 424, NGC 1320, and IC 2560.

NuSTAR and XMM-Newton Observations of Luminous, Heavily Obscured, WISE-selected Quasars at z \~ 2 (2014)
Journal Article
Stern, D., Lansbury, G., Assef, R., Brandt, W., Alexander, D., Ballantyne, D., …Zhang, W. (2014). NuSTAR and XMM-Newton Observations of Luminous, Heavily Obscured, WISE-selected Quasars at z \~ 2. Astrophysical Journal, 794(2), Article 102. https://doi.org/10.1088/0004-637x/794/2/102

We report on a NuSTAR and XMM-Newton program that has observed a sample of three extremely luminous, heavily obscured WISE-selected active galactic nuclei (AGNs) at z ~ 2 across a broad X-ray band (0.1 – 79 keV). The parent sample, selected to be fai... Read More about NuSTAR and XMM-Newton Observations of Luminous, Heavily Obscured, WISE-selected Quasars at z \~ 2.

The Variable Hard X-Ray Emission of NGC 4945 as Observed by NuSTAR (2014)
Journal Article
Puccetti, S., Comastri, A., Fiore, F., Arévalo, P., Risaliti, G., Bauer, F., …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

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 sp... Read More about The Variable Hard X-Ray Emission of NGC 4945 as Observed by NuSTAR.

NuSTAR Unveils a Compton-thick Type 2 Quasar in Mrk 34 (2014)
Journal Article
Gandhi, P., Lansbury, G., Alexander, D., Stern, D., Arévalo, P., Ballantyne, D., …Zhang, W. (2014). NuSTAR Unveils a Compton-thick Type 2 Quasar in Mrk 34. Astrophysical Journal, 792(2), Article 117. https://doi.org/10.1088/0004-637x/792/2/117

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 can be fitted self-consistentl... Read More about NuSTAR Unveils a Compton-thick Type 2 Quasar in Mrk 34.

NuSTAR J033202-2746.8: Direct Constraints on the Compton Reflection in a Heavily Obscured Quasar at z ≈ 2 (2014)
Journal Article
Del Moro, A., Mullaney, J., Alexander, D., Comastri, A., Bauer, F., Treister, E., …Zhang, W. (2014). NuSTAR J033202-2746.8: Direct Constraints on the Compton Reflection in a Heavily Obscured Quasar at z ≈ 2. Astrophysical Journal, 786(1), https://doi.org/10.1088/0004-637x/786/1/16

We report Nuclear Spectroscopic Telescope Array (NuSTAR) observations of NuSTAR J033202-2746.8, a heavily obscured, radio-loud quasar detected in the Extended Chandra Deep Field-South, the deepest layer of the NuSTAR extragalactic survey (~400 ks, at... Read More about NuSTAR J033202-2746.8: Direct Constraints on the Compton Reflection in a Heavily Obscured Quasar at z ≈ 2.

NuSTAR Observations of Heavily Obscured Quasars at z ~ 0.5 (2014)
Journal Article
Lansbury, G., Alexander, D., Del Moro, A., Gandhi, P., Assef, R., Stern, D., …Zhang, W. (2014). NuSTAR Observations of Heavily Obscured Quasars at z ~ 0.5. Astrophysical Journal, 785(1), https://doi.org/10.1088/0004-637x/785/1/17

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... Read More about NuSTAR Observations of Heavily Obscured Quasars at z ~ 0.5.

Barred S0 galaxies in the Coma cluster (2014)
Journal Article
Lansbury, G., Lucey, J., & Smith, R. (2014). Barred S0 galaxies in the Coma cluster. Monthly Notices of the Royal Astronomical Society, 439(2), 1749-1764. https://doi.org/10.1093/mnras/stu049

This study uses r-band images from the Eighth Data Release of the Sloan Digital Sky Survey (SDSS DR8) to study bars in lenticular (S0) galaxies in one of the nearest rich cluster environments, the Coma cluster. We develop techniques for bar detection... Read More about Barred S0 galaxies in the Coma cluster.

The NuSTAR Extragalactic Survey: A First Sensitive Look at the High-energy Cosmic X-Ray Background Population (2013)
Journal Article
Alexander, D., Stern, D., Del Moro, A., Lansbury, G., Assef, R., Aird, J., …Tsai, C. (2013). The NuSTAR Extragalactic Survey: A First Sensitive Look at the High-energy Cosmic X-Ray Background Population. Astrophysical Journal, 773(2), Article 125. https://doi.org/10.1088/0004-637x/773/2/125

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 gsim 10 keV. We find that th... Read More about The NuSTAR Extragalactic Survey: A First Sensitive Look at the High-energy Cosmic X-Ray Background Population.