Browsing by Author "Lansbury, George B."
Now showing 1 - 8 of 8
Results Per Page
Sort Options
- ItemPeering Through the Dust: NuSTAR Observations of Two FIRST-2MASS Red Quasars(2016) LaMassa, Stephanie, M.; Treister, Ezequiel; Ricarte, Angelo; Glikman, Eilat; Urry, C. Megan; Stern, Daniel; Yaqoob, Tahir; Lansbury, George B.; Civano, Francesca; Boggs, Steve E.; Brandt, W N.
- ItemThe NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South(2015) Mullaney, J.; Bauer, Franz Erik; Treister, Ezequiel; Del Moro, A.; Aird, J. A.; Alexander, D. M.; Civano, Francesca; Hickox, R. C.; Lansbury, George B.; Ajello, Marco; Assef, R.
- ItemThe NuSTAR Extragalactic Surveys: Source Catalog and the Compton-thick Fraction in the UDS Field.(2018) Masini, A.; Treister, Ezequiel; Civano, Francesca; Comastri, A.; Fornasini, F.; Ballantyne, D. R.; Lansbury, George B.; Alexander, D. M.; Boorman, P.G.; Brandt, W N.
- ItemThe NuSTAR Extragalactic Surveys: The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-Ray Background(2016) Harrison, F. A.; Bauer, Franz Erik; Treister, Ezequiel; Aird, J. A.; Civano, Francesca; Lansbury, George B.; Mullaney, J.; Ballantyne, D. R.; Alexander, D. M.; Stern, Daniel; Ajello, Marco
- ItemThe NuSTAR Extragalactic Surveys: X-Ray Spectroscopic Analysis of the Bright Hard-band Selected Sample(2018) Zappacosta, L.; Ricci, Claudio; Treister, Ezequiel; Comastri, A.; Civano, Francesca; Puccetti, S.; Fiore, F.; Aird, J. A.; Del Moro, A.; Lansbury, George B.; Lanzuisi, G.
- ItemThe NuSTAR Serendipitous Survey: Hunting for the Most Extreme Obscured AGN at >10 keV(2017) Lansbury, George B.; Bauer, Franz Erik; Treister, Ezequiel; Ricci, Claudio; Alexander, D. M.; Aird, J. A.; Gandhi, P.; Stern, Daniel.; Koss, M.; Lamperti, Isabella; Ajello, Marco
- ItemThe NuSTAR Serendipitous Survey: The 40-month Catalog and the Properties of the Distant High-energy X-Ray Source Population(2017) Lansbury, George B.; Treister, Ezequiel; Bauer, Franz Erik; Stern, Daniel; Aird, J. A.; Alexander, D. M.; Fuentes, C.; Harrison, F. A.; Tomsick, J. A.; Baloković, M.; Del Moro, A.
- ItemThe NuSTAR Serendipitous Survey: The 80 Month Catalog and Source Properties of the High-energy Emitting Active Galactic Nucleus and Quasar Population(2024) Greenwell, Claire L.; Klindt, Lizelke; Lansbury, George B.; Rosario, David J.; Alexander, David M.; Aird, James; Stern, Daniel; Forster, Karl; Koss, Michael J.; Bauer, Franz E.; Ricci, Claudio; Tomsick, John; Brandt, William N.; Connor, Thomas; Boorman, Peter G.; Annuar, Adlyka; Ballantyne, David R.; Chen, Chien-Ting; Civano, Francesca; Comastri, Andrea; Fawcett, Victoria A.; Fornasini, Francesca M.; Gandhi, Poshak; Harrison, Fiona; Heida, Marianne; Hickox, Ryan; Kammoun, Elias S.; Lanz, Lauranne; Marchesi, Stefano; Noirot, Gael; Romero-Colmenero, Encarni; Treister, Ezequiel; Urry, C. Megan; Vaisanen, Petri; van Soelen, BrianWe present a catalog of hard X-ray serendipitous sources detected in the first 80 months of observations by the Nuclear Spectroscopic Telescope Array (NuSTAR). The NuSTAR serendipitous survey 80 month (NSS80) catalog has an unprecedented similar to 62 Ms of effective exposure time over 894 unique fields (a factor of 3 increase over the 40 month catalog, NSS40), with an areal coverage of similar to 36 deg(2), larger than all NuSTAR extragalactic surveys. NSS80 provides 1274 hard X-ray sources in the 3-24 keV band (822 new detections compared to the previous NSS40). Approximately 76% of the NuSTAR sources have lower-energy (<10 keV) X-ray counterparts from Chandra, XMM-Newton, and Swift-XRT. We have undertaken an extensive campaign of ground-based spectroscopic follow-up to obtain new source redshifts and classifications for 427 sources. Combining these with existing archival spectroscopy provides redshifts for 550 NSS80 sources, of which 547 are classified. The sample is primarily composed of active galactic nuclei (AGNs), detected over a large range in redshift (z = 0.012-3.43), but also includes 58 spectroscopically confirmed Galactic sources. In addition, five AGN-galaxy pairs, one dual AGN system, one BL Lac candidate, and a hotspot of 4C 74.26 (radio quasar) have been identified. The median rest-frame 10-40 keV luminosity and redshift of NSS80 are < L10-40 keV > = 1.2 x 10(44) erg s(-1) and < z > = 0.56. We investigate the optical properties and construct composite optical spectra to search for subtle signatures not present in the individual spectra, finding an excess of redder BL AGNs compared to optical quasar surveys, predominantly due to the presence of the host galaxy and, at least in part, due to dust obscuration.