Outputs (27)

Mid-infrared luminous quasars in the GOODS–Herschel fields: a large population of heavily obscured, Compton-thick quasars at z ≈ 2 (2015)
Journal Article
Del Moro, A., Alexander, D., Bauer, F., Daddi, E., Kocevski, D., McIntosh, D., …Xue, Y. (2016). Mid-infrared luminous quasars in the GOODS–Herschel fields: a large population of heavily obscured, Compton-thick quasars at z ≈ 2. Monthly Notices of the Royal Astronomical Society, 456(2), 2105-2125. https://doi.org/10.1093/mnras/stv2748

We present the infrared (IR) and X-ray properties of a sample of 33 mid-IR luminous quasars (νL6 μm ≥ 6 × 1044 erg s−1) at redshift z ≈ 1–3, identified through detailed spectral energy distribution analyses of distant star-forming galaxies, using the... Read More about Mid-infrared luminous quasars in the GOODS–Herschel fields: a large population of heavily obscured, Compton-thick quasars at z ≈ 2.

The KMOS AGN Survey at High redshift (KASHz): the prevalence and drivers of ionized outflows in the host galaxies of X-ray AGN (2015)
Journal Article
Harrison, C., Alexander, D., Mullaney, J., Stott, J., Swinbank, A., Arumugam, V., …Sharples, R. (2016). The KMOS AGN Survey at High redshift (KASHz): the prevalence and drivers of ionized outflows in the host galaxies of X-ray AGN. Monthly Notices of the Royal Astronomical Society, 456(2), 1195-1220. https://doi.org/10.1093/mnras/stv2727

We present the first results from the KMOS (K-band Multi-Object Spectrograph) AGN (active galactic nuclei) Survey at High redshift (KASHz), a VLT/KMOS integral-field spectroscopic (IFS) survey of z ≳ 0.6 AGN. We present galaxy-integrated spectra of 8... Read More about The KMOS AGN Survey at High redshift (KASHz): the prevalence and drivers of ionized outflows in the host galaxies of X-ray AGN.

NuSTAR catches the unveiling nucleus of NGC 1068 (2015)
Journal Article
Marinucci, A., Bianchi, S., Matt, G., Alexander, D., Baloković, M., Bauer, F., …Walton, D. (2016). NuSTAR catches the unveiling nucleus of NGC 1068. Monthly Notices of the Royal Astronomical Society: Letters, 456(1), L94-L98. https://doi.org/10.1093/mnrasl/slv178

We present a NuSTAR and XMM–Newton monitoring campaign in 2014/2015 of the Compton-thick Seyfert 2 galaxy, NGC 1068. During the 2014 August observation, we detect with NuSTAR a flux excess above 20 keV (32 ± 6 per cent) with respect to the 2012 Decem... Read More about NuSTAR catches the unveiling nucleus of NGC 1068.

The NuSTAR Extragalactic Survey: First Direct Measurements of the \gsim10 KeV X-Ray Luminosity Function for Active Galactic Nuclei at z > 0.1 (2015)
Journal Article
Aird, J., Alexander, D., Ballantyne, D., Civano, F., Del-Moro, A., Hickox, R., …Zhang, W. (2015). The NuSTAR Extragalactic Survey: First Direct Measurements of the \gsim10 KeV X-Ray Luminosity Function for Active Galactic Nuclei at z > 0.1. Astrophysical Journal, 815(1), Article 66. https://doi.org/10.1088/0004-637x/815/1/66

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 < z < 3, selected at 8–24 keV energies from sources in the Nuclear Spectrosco... Read More about The NuSTAR Extragalactic Survey: First Direct Measurements of the \gsim10 KeV X-Ray Luminosity Function for Active Galactic Nuclei at z > 0.1.

NuSTAR Observations of the Compton-thick Active Galactic Nucleus and Ultraluminous X-Ray Source Candidate in NGC 5643 (2015)
Journal Article
Annuar, A., Gandhi, P., Alexander, D., Lansbury, G., Arevalo, P., Ballantyne, D., …Zhang, W. (2015). NuSTAR Observations of the Compton-thick Active Galactic Nucleus and Ultraluminous X-Ray Source Candidate in NGC 5643. Astrophysical Journal, 815(1), Article 36. https://doi.org/10.1088/0004-637x/815/1/36

We present two Nuclear Spectroscopic Telescope Array (NuSTAR) observations of the local Seyfert 2 active galactic nucleus (AGN) and an ultraluminous X-ray source (ULX) candidate in NGC 5643. Together with archival data from Chandra, XMM-Newton, and S... Read More about NuSTAR Observations of the Compton-thick Active Galactic Nucleus and Ultraluminous X-Ray Source Candidate in NGC 5643.

ALMA Deep Field in SSA22: A Concentration of Dusty Starbursts in a z = 3.09 Protocluster Core (2015)
Journal Article
Umehata, H., Tamura, Y., Kohno, K., Ivison, R., Alexander, D., Geach, J., …Yun, M. (2015). ALMA Deep Field in SSA22: A Concentration of Dusty Starbursts in a z = 3.09 Protocluster Core. Astrophysical Journal Letters, 815, Article L8. https://doi.org/10.1088/2041-8205/815/1/l8

We report the results of 1farcm5 × 3' mapping at 1.1 mm with the Atacama Large Millimeter/submillimeter Array toward the central region of the z = 3.09 SSA22 protocluster. By combining our source catalog with archival spectroscopic redshifts, we find... Read More about ALMA Deep Field in SSA22: A Concentration of Dusty Starbursts in a z = 3.09 Protocluster Core.

An enhanced merger fraction within the galaxy population of the SSA22 protocluster at z = 3.1 (2015)
Journal Article
Hine, N., Geach, J., Alexander, D., Lehmer, B., Chapman, S., & Matsuda, Y. (2016). An enhanced merger fraction within the galaxy population of the SSA22 protocluster at z = 3.1. Monthly Notices of the Royal Astronomical Society, 455(3), 2363-2370. https://doi.org/10.1093/mnras/stv2448

The overdense environments of protoclusters of galaxies in the early Universe (z > 2) are expected to accelerate the evolution of galaxies, with an increased rate of stellar mass assembly and black hole accretion compared to co-eval galaxies in the a... Read More about An enhanced merger fraction within the galaxy population of the SSA22 protocluster at z = 3.1.

NuSTAR Hard X-Ray Survey of the Galactic Center Region I: Hard X-Ray Morphology and Spectroscopy of the Diffuse Emission (2015)
Journal Article
Mori, K., Hailey, C., Krivonos, R., Hong, J., Ponti, G., Bauer, F., …Zoglauer, A. (2015). NuSTAR Hard X-Ray Survey of the Galactic Center Region I: Hard X-Ray Morphology and Spectroscopy of the Diffuse Emission. Astrophysical Journal, 814(2), Article 94. https://doi.org/10.1088/0004-637x/814/2/94

We present the first sub-arcminute images of the Galactic Center above 10 keV, obtained with NuSTAR. NuSTAR resolves the hard X-ray source IGR J17456–2901 into non-thermal X-ray filaments, molecular clouds, point sources, and a previously unknown cen... Read More about NuSTAR Hard X-Ray Survey of the Galactic Center Region I: Hard X-Ray Morphology and Spectroscopy of the Diffuse Emission.

A NuSTAR Survey of Nearby Ultraluminous Infrared Galaxies (2015)
Journal Article
Teng, S., Rigby, J., Stern, D., Ptak, A., Alexander, D., Bauer, F., …Zhang, W. (2015). A NuSTAR Survey of Nearby Ultraluminous Infrared Galaxies. Astrophysical Journal, 814(1), Article 56. https://doi.org/10.1088/0004-637x/814/1/56

We present a Nuclear Spectroscopic Telescope Array (NuSTAR), Chandra, and XMM-Newton survey of nine of the nearest ultraluminous infrared galaxies (ULIRGs). The unprecedented sensitivity of NuSTAR at energies above 10 keV enables spectral modeling wi... Read More about A NuSTAR Survey of Nearby Ultraluminous Infrared Galaxies.

NuSTAR Spectroscopy of Multi-component X-Ray Reflection from NGC 1068 (2015)
Journal Article
Bauer, F., Arévalo, P., Walton, D., Koss, M., Puccetti, S., Gandhi, P., …Zhang, W. (2015). NuSTAR Spectroscopy of Multi-component X-Ray Reflection from NGC 1068. Astrophysical Journal, 812(2), Article 116. https://doi.org/10.1088/0004-637x/812/2/116

We report on high-energy X-ray observations of the Compton-thick Seyfert 2 galaxy NGC 1068 with NuSTAR, which provide the best constraints to date on its >10 keV spectral shape. The NuSTAR data are consistent with those from past and current instrume... Read More about NuSTAR Spectroscopy of Multi-component X-Ray Reflection from NGC 1068.

Cold dust emission from X-ray AGN in the SCUBA-2 Cosmology Legacy Survey: dependence on luminosity, obscuration and AGN activity (2015)
Journal Article
Banerji, M., McMahon, R., Willott, C., Geach, J., Harrison, C., Alaghband-Zadeh, S., …van der Werf, P. (2015). Cold dust emission from X-ray AGN in the SCUBA-2 Cosmology Legacy Survey: dependence on luminosity, obscuration and AGN activity. Monthly Notices of the Royal Astronomical Society, 454(1), 419-438. https://doi.org/10.1093/mnras/stv1881

We study the 850-μm emission in X-ray-selected active galactic nuclei (AGN) in the ∼2 deg2 COSMOS field using new data from the SCUBA-2 Cosmology Legacy Survey. We find 19 850-μm bright X-ray AGN in a ‘high-sensitivity’ region covering 0.89 deg2 with... Read More about Cold dust emission from X-ray AGN in the SCUBA-2 Cosmology Legacy Survey: dependence on luminosity, obscuration and AGN activity.

ALMA and Herschel reveal that X-ray-selected AGN and main-sequence galaxies have different star formation rate distributions (2015)
Journal Article
Mullaney, J., Alexander, D., Aird, J., Bernhard, E., Daddi, E., Del Moro, A., …Stanley, F. (2015). ALMA and Herschel reveal that X-ray-selected AGN and main-sequence galaxies have different star formation rate distributions. Monthly Notices of the Royal Astronomical Society: Letters, 453(1), L83-L87. https://doi.org/10.1093/mnrasl/slv110

Using deep Herschel and ALMA observations, we investigate the star formation rate (SFR) distributions of X-ray-selected active galactic nucleus (AGN) host galaxies at 0.5 < z < 1.5 and 1.5 < z < 4, comparing them to that of normal, star-forming (i.e.... Read More about ALMA and Herschel reveal that X-ray-selected AGN and main-sequence galaxies have different star formation rate distributions.

A remarkably flat relationship between the average star formation rate and AGN luminosity for distant X-ray AGN (2015)
Journal Article
Stanley, F., Harrison, C., Alexander, D., Swinbank, A., Aird, J., Del Moro, A., …Mullaney, J. (2015). A remarkably flat relationship between the average star formation rate and AGN luminosity for distant X-ray AGN. Monthly Notices of the Royal Astronomical Society, 453(1), 591-604. https://doi.org/10.1093/mnras/stv1678

In this study, we investigate the relationship between the star formation rate (SFR) and AGN luminosity (LAGNLAGN) for ∼2000 X-ray detected AGN. The AGN span over three orders of magnitude in X-ray luminosity (1042<L2−8keV<1045.5ergs−11042<L2−8keV<10...

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, the X-ray spectra can only be reliably characterized using broad-band measurements which extend to... Read More about NuSTAR Reveals Extreme Absorption in z < 0.5 Type 2 Quasars.

The Nustar Extragalactic Surveys: Overview and Catalog from the COSMOS Field (2015)
Journal Article
Civano, F., Hickox, R., Puccetti, S., Comastri, A., Mullaney, J., Zappacosta, L., …Zhang, W. (2015). The Nustar Extragalactic Surveys: Overview and Catalog from the COSMOS Field. Astrophysical Journal, 808(2), Article 185. https://doi.org/10.1088/0004-637x/808/2/185

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. We present the NuSTAR survey o... Read More about The Nustar Extragalactic Surveys: Overview and Catalog from the COSMOS Field.

The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South (2015)
Journal Article
Mullaney, J., Del-Moro, A., Aird, J., Alexander, D., Civano, F., Hickox, R., …Zhang, W. (2015). The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South. Astrophysical Journal, 808(2), https://doi.org/10.1088/0004-637x/808/2/184

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 of the NuSTAR extragalactic su... Read More about The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South.

Rapid Variability of Blazar 3C 279 during Flaring States in 2013-2014 with Joint Fermi-LAT, NuSTAR, Swift, and Ground-Based Multiwavelength Observations (2015)
Journal Article
Hayashida, M., Nalewajko, K., Madejski, G., Sikora, M., Itoh, R., Ajello, M., …Gupta, A. (2015). Rapid Variability of Blazar 3C 279 during Flaring States in 2013-2014 with Joint Fermi-LAT, NuSTAR, Swift, and Ground-Based Multiwavelength Observations. Astrophysical Journal, 807(1), Article 79. https://doi.org/10.1088/0004-637x/807/1/79

We report the results of a multiband observing campaign on the famous blazar 3C 279 conducted during a phase of increased activity from 2013 December to 2014 April, including first observations of it with NuSTAR. The γ-ray emission of the source meas... Read More about Rapid Variability of Blazar 3C 279 during Flaring States in 2013-2014 with Joint Fermi-LAT, NuSTAR, Swift, and Ground-Based Multiwavelength Observations.

An extragalactic spectroscopic survey of the SSA22 field (2015)
Journal Article
Saez, C., Lehmer, B., Bauer, F., Stern, D., Gonzales, A., Rreza, I., …Hayashino, T. (2015). An extragalactic spectroscopic survey of the SSA22 field. Monthly Notices of the Royal Astronomical Society, 450(3), 2615-2630. https://doi.org/10.1093/mnras/stv747

We present Very Large Telescope VIMOS, Keck DEIMOS and Keck LRIS multi-object spectra of 367 sources in the field of the z ≈ 3.09 protocluster SSA22. Sources are spectroscopically classified via template matching, allowing new identifications for 206... Read More about An extragalactic spectroscopic survey of the SSA22 field.

Variable Hard-X-Ray Emission from the Candidate Accreting Black Hole in Dwarf Galaxy Henize 2-10 (2015)
Journal Article
Whalen, T., Hickox, R., Reines, A., Greene, J., Sivakoff, G., Johnson, K., …Goulding, A. (2015). Variable Hard-X-Ray Emission from the Candidate Accreting Black Hole in Dwarf Galaxy Henize 2-10. Astrophysical Journal, 806(1), Article 37. https://doi.org/10.1088/0004-637x/806/1/37

We present an analysis of the X-ray spectrum and long-term variability of the nearby dwarf starburst galaxy Henize 2–10. Recent observations suggest that this galaxy hosts an actively accreting black hole (BH) with mass ~106 ${{M}_{\odot }}$. The pre... Read More about Variable Hard-X-Ray Emission from the Candidate Accreting Black Hole in Dwarf Galaxy Henize 2-10.

44Ti gamma-ray emission lines from SN1987A reveal an asymmetric explosion (2015)
Journal Article
Boggs, S., Harrison, F., Miyasaka, H., Grefenstette, B., Zoglauer, A., Fryer, C., …Zhang, W. (2015). 44Ti gamma-ray emission lines from SN1987A reveal an asymmetric explosion. Science, 348(6235), 670-671. https://doi.org/10.1126/science.aaa2259

In core-collapse supernovae, titanium-44 (44Ti) is produced in the innermost ejecta, in the layer of material directly on top of the newly formed compact object. As such, it provides a direct probe of the supernova engine. Observations of supernova 1... Read More about 44Ti gamma-ray emission lines from SN1987A reveal an asymmetric explosion.