Now showing items 1-20 of 483

    • 0FGL J1830.3+0617: A FERMI BLAZAR NEAR THE GALACTIC PLANE 

      Mirabal, N.; Halpern, J. P. (IOP, 2009-08-10)
      aas-2018.png iop-2016.png 0FGL J1830.3+0617: A FERMI BLAZAR NEAR THE GALACTIC PLANE N. Mirabal1,3 and J. P. Halpern2 Published 10 August 2009 • © 2009. The American Astronomical Society. All rights ...
    • A 1D fluid model of the Centaurus A jet 

      Wykes, Sarka; Snios, Bradford T.; Nulsen, Paul E. J.; Kraft, Ralph P.; Birkinshaw, Mark; Hardcastle, Martin J.; Worrall, Diana M.; McDonald, Iain; Rejkuba, Marina; Jones, Thomas W.; Stark, David J.; Forman, William R.; Meyer, Eileen T.; Jones, Christine (2018-09-27)
      We implement a steady, one-dimensional flow model for the X-ray jet of Centaurus A in which entrainment of stellar mass loss is the primary cause of dissipation. Using over 260 ks of new and archival Chandra/ACIS data, we ...
    • The 2001 Superoutburst of WZ Sagittae 

      Patterson, Joseph; Masi, Gianluca; Richmond, Michael W.; Martin, Brian; Beshore, Edward; Skillman, David R.; Kemp, Jonathan; Vanmunster, Tonny; Rea, Robert; Allen, William; Davis, Stacey; Davis, Tracy; Henden, Arne A.; Starkey, Donn; Foote, Jerry; Oksanen, Arto; Cook, Lewis M.; Fried, Robert E.; Husar, Dieter; Novák, Rudolf; Campbell, Tut; Robertson, Jeff; Krajci, Thomas; Pavlenko, Elena; Mirabal, Nestor; Niarchos, Panos G.; Brettman, Orville; Walker, Stan (IOP, 2002-06-10)
      We report the results of a worldwide campaign to observe WZ Sagittae during its 2001 superoutburst. After a 23 yr slumber at V = 15.5, the star rose within 2 days to a peak brightness of 8.2, and showed a main eruption ...
    • 2FHL: THE SECOND CATALOG OF HARD FERMI-LAT SOURCES 

      Mirabal, N.; Buson, S.; et al. (IOP, 2016-01-14)
      We present a catalog of sources detected above 50 GeV by the Fermi-Large Area Telescope (LAT) in 80 months of data. The newly delivered Pass 8 event-level analysis allows the detection and characterization of sources in ...
    • 3FGL DEMOGRAPHICS OUTSIDE THE GALACTIC PLANE USING SUPERVISED MACHINE LEARNING: PULSAR AND DARK MATTER SUBHALO INTERPRETATIONS 

      Mirabal, N.; Charles, E.; Ferrara, E. C.; Gonthier, P. L.; Harding, A. K.; Sánchez-Conde, M. A.; Thompson, D.J. (IOP, 2016-06-29)
      Nearly one-third of the sources listed in the Third Fermi Large Area Telescope (LAT) catalog (3FGL) remain unassociated. It is possible that predicted and even unanticipated gamma-ray source classes are present in these ...
    • 3FHL: The Third Catalog of Hard Fermi-LAT Sources 

      Mirabal, N.; et al. (IOP, 2017-09-27)
      We present a catalog of sources detected above 10 GeV by the Fermi Large Area Telescope (LAT) in the first 7 years of data using the Pass 8 event-level analysis. This is the Third Catalog of Hard Fermi-LAT Sources (3FHL), ...
    • Active Galactic Nuclei under the scrutiny of CTA 

      Sol, H.; Zech, A.; Boisson, C.; Almeida, U. Barres de; Biteau, J.; Contreras, J.-L.; Giebels, B.; Hassan, T.; Inoue, Y.; Katarzynsk, K.; Krawczynski, H.; Mirabal, N.; Poutanen, J.; Rieger, F.; Totani, T.; Benbow, W.; Cerruti, M.; Errando, M.; Fallon, L.; Pino, E. de Gouveia Dal; Hinton, J.A.; Inoue, S.; Lenain, J.-P.; Neronov, A.; Takahashi, K.; Takami, H.; White, R. (Elsevier, 2012-12-20)
      Active Galactic Nuclei (hereafter AGN) produce powerful outflows which offer excellent conditions for efficient particle acceleration in internal and external shocks, turbulence, and magnetic reconnection events. The jets ...
    • Advancements in the Aerosol Robotic Network (AERONET) Version 3 database – automated near-real-time quality control algorithm with improved cloud screening for Sun photometer aerosol optical depth (AOD) measurements 

      Giles, David M.; Sinyuk, Alexander; Sorokin, Mikhail G.; Schafer, Joel S.; Smirnov, Alexander; Slutsker, Ilya; Eck, Thomas F.; Holben, Brent N.; Lewis, Jasper R.; Campbell, James R.; Welton, Ellsworth J.; Korkin, Sergey V.; Lyapustin, Alexei I. (Copernicus Publications on behalf of the European Geosciences Union, 2019-01-11)
      The Aerosol Robotic Network (AERONET) has provided highly accurate, ground-truth measurements of the aerosol optical depth (AOD) using Cimel Electronique Sun–sky radiometers for more than 25 years. In Version 2 (V2) of the ...
    • THE AFTERGLOWS OF SWIFT-ERA GAMMA-RAY BURSTS. I. COMPARING PRE-SWIFT AND SWIFT-ERA LONG/SOFT (TYPE II) GRB OPTICAL AFTERGLOWS 

      Mirabal, N. (IOP, 2010-08-23)
      We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to 2009 September, for a total of 76 GRBs, and present an additional three ...
    • AGN Forecasting 

      Hassan, Tarek; Mirabal, Nestor; Contreras, Jose Luis; the CTA Consortium (POS, 2012-06-20)
      The First Fermi-LAT catalog (1FGL) represents the most complete list of sources in the GeV sky to date. We use the reported 1FGL spectral parameters to extrapolate Fermi AGN spectra to the very-high energy (VHE) range (15 ...
    • Agricultural fires in the southeastern U.S. during SEAC⁴RS: Emissions of trace gases and particles and evolution of ozone, reactive nitrogen, and organic aerosol 

      Liu, Xiaoxi; Zhang, Y.; Huey, L. G.; Yokelson, R.J.; Wang, Y.; Jimenez, J. L.; Campuzano-Jost, P.; Beyersdorf, A.J.; Blake, D.R.; Choi, Y.; St. Clair, J. M.; Crounse, J.D.; Day, D. A.; Diskin, G.S.; Fried, A.; Hall, S. R.; Hanisco, T. F.; King, L. E.; Meinardi, S.; Mikoviny, T.; Palm, B. B.; Peischl, J.; Perring, A. E.; Pollack, I. B.; Ryerson, T. B.; Sachse, G.; Schwarz, J. P.; Simpson, I. J.; Tanner, D. J.; Thornhill, K. L.; Ullmann, K.; Weber, R. J.; Wennberg, P. O.; Wisthaler, A.; Wolfe, G. M.; Ziemba, L. D. (AGU Pubication, 2016-05-28)
      Emissions from 15 agricultural fires in the southeastern U.S. were measured from the NASA DC‐8 research aircraft during the summer 2013 Studies of Emissions and Atmospheric Composition, Clouds and Climate Coupling by ...
    • Airborne measurements of BrO and the sum of HOBr and Br2 over the Tropical West Pacific from 1 to 15 km during the CONvective TRansport of Active Species in the Tropics (CONTRAST) experiment 

      Chen, Dexian; Huey, L. Gregory; Tanner, David J.; Salawitch, Ross J.; Anderson, Daniel C.; Wales, Pamela A.; Pan, Laura L.; Atlas, Elliot L.; Hornbrook, Rebecca S.; Apel, Eric C.; Blake, Nicola J.; Campos, Teresa L.; Donets, Valeria; Flocke, Frank M.; Hall, Samuel R.; Hanisco, Thomas F.; Hills, Alan J.; Honomichl, Shawn B.; Jensen, Jørgen B.; Kaser, Lisa; Montzka, Denise D.; Nicely, Julie M; Reeves, Michael J.; Riemer, Daniel D.; Schauffler, Sue M.; Ullmann, Kirk; Weinheimer, Andrew J.; Wolfe, Glenn M. (AGU Pubication, 2016-10-13)
      A chemical ionization mass spectrometer was used to measure BrO and HOBr + Br₂ over the Tropical West Pacific Ocean within the altitude range of 1 to 15 km, during the CONvective TRansport of Active Species in the Tropics ...
    • Airborne measurements of organosulfates over the continental U.S 

      Liao, Jin; Froyd, Karl D.; Murphy, Daniel M.; Keutsch, Frank N.; Yu, Ge; Wennberg, Paul O.; St. Clair, Jason M.; Crounse, John D.; Wisthaler, Armin; Mikoviny, Tomas; Jimenez, Jose L.; Campuzano-Jost, Pedro; Day, Douglas A.; Hu, Weiwei; Ryerson, Thomas B.; Pollack, Ilana B.; Peischl, Jeff; Anderson, Bruce E.; Ziemba, Luke D.; Blake, Donald R.; Meinardi, Simone; Diskin, Glenn (AGU Pubication, 2015-02-28)
      Organosulfates are important secondary organic aerosol (SOA) components and good tracers for aerosol heterogeneous reactions. However, the knowledge of their spatial distribution, formation conditions, and environmental ...
    • Airborne measurements of the atmospheric emissions from a fuel ethanol refinery 

      Gouw, J. A. de; McKeen, S. A.; Aikin, K. C.; Brock, C. A.; Brown, S. S.; Gilman, J. B.; Graus, M.; Hanisco, T.; Holloway, J. S.; Kaiser, J.; Keutsch, F. N.; Lerner, B.M.; Liao, J.; Markovic, M. Z.; Middlebrook, A. M.; Min, K.-E.; Neuman, J. A.; Nowak, J. B.; Peischl, J.; Pollack, I. B.; Roberts, J. M.; Ryerson, T. B.; Trainer, M.; Veres, P. R.; Warneke, C.; Welti, A.; Wolfe, G. M. (AGU Pubication, 2015-04-08)
      Ethanol made from corn now constitutes approximately 10% of the fuel used in gasoline vehicles in the U.S. The ethanol is produced in over 200 fuel ethanol refineries across the nation. We report airborne measurements ...
    • Airborne measurements of western U.S. wildfire emissions: Comparison with prescribed burning and air quality implications 

      Liu, Xiaoxi; Huey, L. Gregory; Yokelson, Robert J.; Selimovic, Vanessa; Simpson, Isobel J.; Müller, Markus; Jimenez, Jose L.; Campuzano‐Jost, Pedro; Beyersdorf, Andreas J.; Blake, Donald R.; Zachary, Butterfield; Choi, Yonghoon; Crounse, John D.; Day, Douglas A.; Diskin, Glenn S.; Dubey, Manvendra K.; Edward, Fortner; Hanisco, Thomas F.; Hu, Weiwei; King, Laura E.; Kleinman, Lawrence; Meinardi, Simone; Mikoviny, Tomas; Onasch, Timothy B.; Palm, Brett B.; Peischl, Jeff; Pollack, Ilana B.; Ryerson, Thomas B.; Sachse, Glen W.; Sedlacek, Arthur J.; Shilling, John E.; Springston, Stephen; St. Clair, Jason M.; Tanner, David J.; Teng, Alexander P.; Wennberg, Paul O.; Wisthaler, Armin; Wolfe, Glenn M. (AGU Pubication, 2017-06-14)
      Wildfires emit significant amounts of pollutants that degrade air quality. Plumes from three wildfires in the western U.S. were measured from aircraft during the Studies of Emissions and Atmospheric Composition, Clouds and ...
    • AIRS L1c Frequency Calibration 

      UMBC Atmospheric Spectroscopy Lab (ASL) (2019-11-03)
      This document summarizes the observed frequency drifts in the AIRS L1b radiances and then describes how they are corrected in the AIRS L1c product that should be available at the NASA Goddard DISC in early 2010. The ...
    • All-Optical Switching Demonstration using Two-Photon Absorption and the Classical Zeno Effect 

      Hendrickson, S. M.; Weiler, C. N.; Camacho, R.M.; Rakich, P. T.; Young, A. I.; Shaw, M. J.; Pittman, T. B.; Franson, J. D.; Jacobs, B. C. (2018-10-31)
      Low-contrast all-optical Zeno switching has been demonstrated in a Si3N4 microdisk resonator coupled to a hot atomic vapor. The device is based on the suppression of the field build-up within a microcavity due to non-degenerate ...
    • All-optical-switching demonstration using two-photon absorption and the Zeno effect 

      Hendrickson, S. M.; Weiler, C. N.; Camacho, R. M.; Rakich, P. T.; Young, A. I.; Shaw, M. J.; Pittman, T.B.; Franson, J.D.; Jacobs, B. C. (American Physical Society (APS), 2013-02-07)
      Low-contrast all-optical Zeno switching has been demonstrated in a Si₃N₄ microdisk resonator coupled to warm atomic vapor. The device is based on the suppression of the resonant microcavity field buildup due to nondegenerate ...
    • All-optical-switching demonstration using two-photon absorption and the Zeno effect 

      Hickman, G. T.; Franson, J.D.; Pittman, T.B. (OSA Publishing, 2016)
      Metastable states of noble gas atoms are typically produced by electrical discharge techniques or “all-optical” excitation methods. Here we combine electrical discharges with optical pumping to demonstrate “optically ...
    • An analysis of fast photochemistry over high northern latitudes during spring and summer using in-situ observations from ARCTAS and TOPSE 

      Olson, J. R.; Crawford, J. H.; Brune, W.; Mao, J.; Ren, X.; Fried, A.; Anderson, B.; Apel, E.; Beaver, M.; Blake, D.; Chen, G.; Crounse, J.; Dibb, J.; Diskin, G.; Hall, S. R.; Huey, L. G.; Knapp, D.; Richter, D.; Riemer, D.; St. Clair, J.; Ullmann, K.; Walega, J.; Weibring, P.; Weinheimer, A.; Wennberg, P.; Wisthaler, A. (Copernicus Publications, 2012-08-01)
      Observations of chemical constituents and meteorological quantities obtained during the two Arctic phases of the airborne campaign ARCTAS (Arctic Research of the Composition of the Troposphere from Aircraft and Satellites) ...