Now showing items 640-659 of 863

    • Radio Loud AGN Unification: Connecting Jets and Accretion 

      Meyer, Eileen T.; Georganopoulos, Markos; Fossati, Giovanni; Lister, Matthew L. (EDP sciences, 2013-12-09)
      While only a fraction of Active Galactic Nuclei are observed to host a powerful relativistic jet, a cohesive picture is emerging that radio-loud AGN may represent an important phase in the evolution of galaxies and the ...
    • Radio spectra-polarimetric properties of TXS 0025+197 (J0028+2000) 

      Schinzel, F. K.; Ojha, R.; Sjouwerman, L. (The Astronomer's Telegram, 2018-11-08)
    • The Radio Variability of the Gravitational Lens PMN J1838−3427 

      Winn, Joshua N.; Lovell, James E. J.; Bignall, Hayley; Gaensler, Bryan M.; Getts, Tracy J.; Kedziora-Chudczer, Lucyna; Ojha, Roopesh; Reynolds, John E.; Tingay, Steven J.; Tzioumis, Tasso (IOP, 2004-12-01)
      We present the results of a radio variability study of the gravitational lens PMN J1838-3427. Our motivation was to determine the Hubble constant by measuring the time delay between variations of the two quasar images. We ...
    • Radio–gamma-ray connection and spectral evolution in 4C +49.22 (S4 1150+49): the Fermi, Swift and Planck view 

      Cutini, S.; Ciprini, S.; Orienti, M.; Tramacere, A.; D'Ammando, F.; Verrecchia, F.; Polenta, G.; Carrasco, L.; D'Elia, V.; Giommi, P.; González-Nuevo, J.; Grandi, P.; Harrison, D.; Hays, E.; Larsson, S.; Lähteenmäki, A.; León-Tavares, J.; López-Caniego, M.; Natoli, P.; Ojha, R.; Partridge, B.; Porras, A.; Reyes, L.; Recillas, E.; Torresi, E. (Oxford University Press, 2014-11-07)
      The Large Area Telescope on board the Fermi Gamma-ray Space Telescope detected a strong γ-ray flare on 2011 May 15 from a source identified as 4C +49.22, a flat spectrum radio quasar (FSRQ) also known as S4 1150+49. This ...
    • Rapid adiabatic gating for capacitively coupled quantum dot hybrid qubits without barrier control 

      Setser, A. A.; Kestner, J. P. (2018)
      We theoretically examine the capacitive coupling between two quantum dot hybrid qubits, each consisting of three electrons in a double quantum dot, as a function of the energy detuning of the double dot potentials. We ...
    • Rapid deposition of oxidized biogenic compounds to a temperate forest 

      Nguyen, Tran B.; Crounse, John D.; Teng, Alex P.; St. Clair, Jason M.; Paulot, Fabien; Wolfe, Glenn M.; Wennberg, Paul O. (2015-02-03)
      We report fluxes and dry deposition velocities for 16 atmospheric compounds above a southeastern United States forest, including: hydrogen peroxide (H₂O₂), nitric acid (HNO₃), hydrogen cyanide (HCN), hydroxymethyl ...

      Mayer, M.; Buehler, R.; Hays, E.; Cheung, C. C.; Dutka, M. S.; Grove, J. E.; Kerr, M.; Ojha, R. (IOP, 2013-09-11)
      We report on a bright flare in the Crab Nebula detected by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. The period of significantly increased luminosity occurred in 2013 March and lasted for ...
    • The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125 

      Mirabal, Nestor; et al. (IOP, 2008-09-20)
      We report on multiwavelength observations, ranging from X-ray to radio wave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopic observations reveal the presence of absorption lines due to O I, Si II, and ...
    • A ray‐tracing technique for improving Satellite Laser Ranging atmospheric delay corrections, including the effects of horizontal refractivity gradients 

      Hulley, G. C.; Pavlis, E. C. (AGU Pubication, 2007-06-23)
      In this paper we study the effects of horizontal refractivity gradients on the propagation of optical signals for a globally distributed set of Satellite Laser Ranging (SLR) stations. Using two‐dimensional ray tracing and ...
    • Reanalysis and extension of the ILRS weekly solutions: Towards an ILRS-TRF 

      Pavlis, Erricos C.; Luceri, V. (International Terrestrial Reference Frame, 2007-04-15)
    • Reassessing the ratio of glyoxal to formaldehyde as an indicator of hydrocarbon precursor speciation 

      Kaiser, J.; Wolfe, G. M.; Min, K.E.; Brown, S. S.; Miller, C. C.; Jacob, D. J.; Gouw, J. A.; Graus, M.; Hanisco, T. F.; Holloway, J.; Peischl, J.; Pollack, I. B.; Ryerson, T. B.; Warneke, C.; Washenfelder, R. A.; Keutsch, F. N. (Copernicus Publications, 2015-07-13)
      The yield of formaldehyde (HCHO) and glyoxal (CHOCHO) from oxidation of volatile organic compounds (VOCs) depends on precursor VOC structure and the concentration of NOx (NOx = NO + NO2). Previous work has proposed that ...
    • Recent Progress in Understanding the Large Scale Jets of Powerful Quasars 

      Georganopoulos, Markos; Meyer, Eileen T.; Perlman, Eric S. (MDPI, 2016-11-23)
      Our understanding of the physics of kpc-scale quasar jets had seemed to converge to a paradigm in which these jets are as highly relativistic on the kpc scale as they are on sub-pc scales close to the central black hole. ...
    • Recent Results from SLR Experiments in Fundamental Physics 

      Pavlis, Erricos C.; Ciufolini, Ignazio; König, Rolf (NASA, 2006-10)
    • A Recipe for Geophysical Exploration of Enceladus 

      Ermakov, Anton I.; Castillo-Rogez, Julie C.; Park, Ryan S.; Sotin, Christophe; Lazio, Joseph; Howell, Samuel M.; Keane, James T.; Hemingway, Douglas J.; Nimmo, Francis; Kite, Edwin; Viswanathan, Vishnu; Steinbrügge, Gregor; Tobie, Gabriel; Lainey, Valery (2020-08-06)
      Orbital geophysical investigations of Enceladus are critical to understand its energy balance. Mapping Enceladus' gravity field, improving the accuracy of the physical libration amplitude, and measuring Enceladus' tidal ...
    • A Redshift Determination for XRF 020903: First Spectroscopic Observations of an X-Ray Flash 

      Soderberg, A. M.; Kulkarni, S. R.; Berger, E.; Fox, D. B.; Price, P. A.; Yost, S. A.; Hunt, M. P.; Frail, D. A.; Walker, R. C.; Hamuy, M.; Shectman, S. A.; Halpern, J. P.; Mirabal, N. (IOP, 2004-05-10)
      We report the discovery of optical and radio afterglow emission from the extremely soft X-ray flash XRF 020903. Our spectroscopic observations provide the first redshift for an X-ray flash, thereby setting the distance ...
    • Redshift Studies of Scintillating and Non-scintillating Extragalactic Radio Sources: Direct Detection of the Ionized Intergalactic Medium? 

      Ojha, Roopesh; Pursimo, Tapio; Jauncey, David L.; Lovell, James E.; Macquart, Jean-Pierre; Dutka, Michael S. (Astronomical Society of the Pacific Conference Series, 2008)
      Interstellar scintillation has been shown to be primarily responsible for intraday variability exhibited by extragalactic sources at centimeter wavelengths. The recent Micro-Arcsecond Scintillation-Induced Variability ...
    • Redshifted Fe Kα line from the unusual γ-ray source PMN J1603–4904 

      Müller, C.; Krauß, F.; Kreikenbohm, A.; Beuchert, T.; Kadler, M.; Ojha, R.; Wilms, J.; Böck, M.; Carpenter, B.; Dutka, M.; Markowitz, A.; McConville, W.; Pottschmidt, K.; Stawarz, Ł.; Taylor, G. B. (EDP sciences, 2015-02-04)
      Context. Multiwavelength observations have revealed the highly unusual properties of the γ-ray source PMN J1603–4904, which are difficult to reconcile with any other well-established γ-ray source class. The object is either ...
    • Reduced decoherence using squeezing, amplification, and antisqueezing 

      Brewster, R. A.; Pittman, T.B.; Franson, J.D. (American Physical Society (APS), 2018-09-14)
      Loss and decoherence are major problems in the transmission of nonclassical states of light over large distances. It was recently shown that the effects of decoherence can be reduced by applying a probabilistic noiseless ...
    • Relativistic Jets in the Accretion & Collimation Zone: New Challenges Enabled by New Instruments 

      Perlman, Eric S.; Birkinshaw, Mark; Kadler, Matthias; Komissarov, Serguei; Lister, Matthew; Meier, David; Meyer, Eileen; Nakamura, Masanori; Nyland, Kristina; O’Dea, Christopher; Worrall, Diana; Zdziarski, Andrzej (2019-02-26)
      Jets are a ubiquitous part of the accretion process, seen in a wide variety of objects ranging from active galaxies (AGN) to X-ray binary stars and even newly formed stars. AGN jets are accelerated by the supermassive black ...
    • Repeatability of measurements: Non-Hermitian observables and quantum Coriolis force 

      Gardas, Bartłomiej; Deffner, Sebastian; Saxena, Avadh (American Physical Society (APS), 2016-08-26)
      A noncommuting measurement transfers, via the apparatus, information encoded in a system's state to the external “observer.” Classical measurements determine properties of physical objects. In the quantum realm, the very ...