Now showing items 748-767 of 845

    • TANAMI - Multiwavelength and Multimessenger Observations of Active Galaxies 

      Kadler, M.; Ojha, R.; TANAMI Collaboration (2015-07-08)
      Extragalactic jets launched from the immediate vicinity of supermassive black holes in radio-loud active galactic nuclei (AGN) are key objects in modern astronomy and astroparticle physics. AGN jets carry a fraction of the ...
    • TANAMI - Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry 

      Muller, Cornelia; Kadler, Matthias; Ojha, Roopesh; Bock, M.; Booth, R.; Dutka, M. S.; Edwards, P. G.; Fey, A. L.; Fuhrmann, L.; Hase, H.; Horiuchi, S.; Hungwe, F.; Ros, E.; Taylor, G. B.; Thompson, D. J.; Tingay, S. J.; Tosti, G.; Tzioumis, A. K.; Wilms, J.; Zensus, J. A. (2010-01-18)
      We present a summary of the observation strategy of TANAMI (Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry), a monitoring program to study the parsec-scale structure and dynamics of relativistic ...
    • TANAMI and RadioAstron observations of AGN 

      Edwards, Phil; Ojha, R.; Carpenter, B.; Kadler, M.; Kovalev, Y.; Voytsik, P.; Lisakov, M.; Phillips, C.; Stevens, J.; McCallum, J. (2014-08-07)
    • TANAMI blazars in the IceCube PeV-neutrino fields 

      Krauß, F.; Kadler, M.; Mannheim, K.; Schulz, R.; Trüstedt, J.; Wilms, J.; Ojha, R.; Ros, E.; Anton, G.; Baumgartner, W.; Beuchert, T.; Blanchard, J.; Bürkel, C.; Carpenter, B.; Eberl, T.; Edwards, P. G.; Eisenacher, D.; Elsässer, D.; Fehn, K.; Fritsch, U.; Gehrels, N.; Gräfe, C.; Grossberger, C.; Hase, H.; Horiuchi, S.; James, C.; Kappes, A.; Katz, U.; Kreikenbohm, A.; Kreykenbohm, I.; Langejahn, M.; Leiter, K.; Litzinger, E.; Lovell, J. E. J.; Müller, C.; Phillips, C.; Plötz, C.; Quick, J.; Steinbring, T.; Stevens, J.; Thompson, D. J.; Tzioumis, A. K. (EDP sciences, 2014-06-24)
      The IceCube Collaboration has announced the discovery of a neutrino flux in excess of the atmospheric background. Owing to the steeply falling atmospheric background spectrum, events at PeV energies most likely have an ...
    • TANAMI counterparts to IceCube high-energy neutrino events 

      Krauß, Felicia; Wang, Bingjie; Baxter, Claire; Kadler, Matthias; Mannheim, Karl; Ojha, Roopesh; Gräfe, Christina; Muller, Cornelia; Wilms, Joern; Carpenter, Bryce; Schulz, Robert; TANAMI Collaboration; Fermi-LAT Collaboration (arXiv, 2015-02-10)
      Since the discovery of a neutrino flux in excess of the atmospheric background by the IceCube Collaboration, searches for the astrophysical sources have been ongoing. Due to the steeply falling background towards higher ...
    • TANAMI monitoring of Centaurus A: The complex dynamics in the inner parsec of an extragalactic jet 

      Müller, C.; Kadler, M.; Ojha, R.; Perucho, M.; Grossberger, C.; Ros, E.; Wilms, J.; Blanchard, J.; Böck, M.; Carpenter, B.; Dutka, M.; Edwards, P. G.; Hase, H.; Horiuchi, S.; Kreikenbohm, A.; Lovell, J. E. J.; Markowitz, A.; Phillips, C.; Plötz, C.; Pursimo, T.; Quick, J.; Rothschild, R.; Schulz, R.; Steinbring, T.; Stevens, J.; Trüstedt, J.; Tzioumis, A. K. (EDP sciences, 2014-10-01)
      Context. Centaurus A (Cen A) is the closest radio-loud active galactic nucleus. Very Long Baseline Interferometry (VLBI) enables us to study the spectral and kinematic behavior of the radio jet-counterjet system on ...
    • The TANAMI Multiwavelength Program: Dynamic spectral energy distributions of southern blazars 

      Krauß, F.; Wilms, J.; Kadler, M.; Ojha, R.; Schulz, R.; Trüstedt, J.; Edwards, P. G.; Stevens, J.; Ros, E.; Baumgartner, W.; Beuchert, T.; Blanchard, J.; Buson, S.; Carpenter, B.; Dauser, T.; Falkner, S.; Gehrels, N.; Graefe, C.; Gulyaev, S.; Hase, H.; Horiuchi, S.; Kreikenbohm, I.; Langejahn, M.; Leiter, K.; Lovell, J. E. J.; Müller, C.; Natusch, T.; Nesci, R.; Pursimo, T.; Phillips, C.; Plötz, C.; Quick, J.; Tzioumis, A. K.; Weston, S. (EDP sciences, 2018-03-03)
      Context. Simultaneous broadband spectral and temporal studies of blazars are an important tool for investigating active galactic nuclei (AGN) jet physics. Aims. We study the spectral evolution between quiescent and ...
    • The TANAMI Program 

      Müller, Cornelia; Kadler, Matthias; Ojha, Roopesh; Böck, M.; Booth, R.; Dutka, M. S.; Edwards, P.; Fey, A. L.; Fuhrmann, L.; Hase, H.; Horiuchi, S.; Jauncey, D.L.; Johnston, K.J.; Katz, U.; Lister, M.; Lovell, J.E.J.; Plötz, C.; Quick, J.F.H.; Ros, E.; Taylor, G.B.; Thompson, D.J.; Tingay, S.J.; Tosti, G.; Tzioumis, A.K.; Wilms, J.; Zensus, J.A. (AIP Publishing, 2010-07-22)
      TANAMI (Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry) is a monitoring program to study the parsec-scale structures and dynamics of relativistic jets in active galactic nuclei (AGN) of the ...
    • The TANAMI Program: Southern-Hemisphere AGN on (Sub-)parsec Scales 

      Müller, Cornelia; Krauß, F.; Kadler, M.; Trüstedt, J.; Ojha, R.; Ros, E.; Wilms, J.; Böck, M.; Dutka, M.; Carpenter, B.; TANAMI collaboration (Proceedings of Science, 2012-10-09)
      The Southern Hemisphere VLBI monitoring program TANAMI provides dual-frequency (8 GHz and 22 GHz), milliarcsecond monitoring of extragalactic jets south of −30◦ declination. The TANAMI sample consists of a combined radio ...
    • TANAMI: Milliarcsecond Resolution Observations of Extragalactic Gamma-ray Sources 

      Ojha, Roopesh; Kadler, M.; Böck, M.; Booth, R.; Dutka, M. S.; Edwards, P. G.; Fey, A. L.; Fuhrmann, L.; Gaume, R. A.; Hase, H.; Horiuchi, S.; Jauncey, D.L.; Johnston, K. J.; Katz, U.; Lister, M.; Lovell, J. E. J.; Müller, C.; Plötz, C.; Quick, J. F. H.; Ros, E.; Taylor, G. B.; Thompson, D. J.; Tingay, S. J.; Tosti, G.; Tzioumis, A. K.; Wilms, J.; Zensus, J. A. (arXiv, 2009-12-31)
      The TANAMI (Tracking AGN with Austral Milliarcsecond Interferometry) and associated programs provide comprehensive radio monitoring of extragalactic gamma-ray sources south of declination -30 degrees. Joint quasi-simultaneous ...
    • TANAMI: tracking active galactic nuclei with austral milliarcsecond interferometry 

      Ojha, R.; Kadler, M.; Böck, M.; Booth, R.; Dutka, M. S.; Edwards, P. G.; Fey, A. L.; Fuhrmann, L.; Gaume, R. A.; Hase, H.; Horiuchi, S.; Jauncey, D. L.; Johnston, K. J.; Katz, U.; Lister, M.; Lovell, J. E. J.; Müller, C.; Plötz, C.; Quick, J. F. H.; Ros, E.; Taylor, G. B.; Thompson, D. J.; Tingay, S. J.; Tosti, G.; Tzioumis, A. K.; Wilms, J.; Zensus, J. A. (EDP sciences, 2010-09-10)
      Context. A number of theoretical models vie to explain the γ-ray emission from active galactic nuclei (AGN). This was a key discovery of EGRET. With its broader energy coverage, higher resolution, wider field of view and ...
    • TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry⋆ 

      Müller, C.; Kadler, M.; Ojha, R.; Schulz, R.; Trüstedt, J.; Edwards, P. G.; Ros, E.; Carpenter, B.; Angioni, R.; Blanchard, J.; Böck, M.; Burd, P. R.; Dörr, M.; Dutka, M. S.; Eberl, T.; Gulyaev, S.; Hase, H.; Horiuchi, S.; Katz, U.; Krauß, F.; Lovell, J. E. J.; Natusch, T.; Nesci, R.; Phillips, C.; Plötz, C.; Pursimo, T.; Quick, J. F. H.; Stevens, J.; Thompson, D. J.; Tingay, S. J.; Tzioumis, A. K.; Weston, S.; Wilms, J.; Zensus, J. A. (EDP sciences, 2018-02-07)
      Context. TANAMI is a multiwavelength program monitoring active galactic nuclei (AGN) south of − 30° declination including high-resolution very long baseline interferometry (VLBI) imaging, radio, optical/UV, X-ray, and γ-ray ...
    • The terrestrial reference frame and the dynamic Earth 

      Altamimi, Zuheir; Angermann, Detlef; Argus, Don; Blewitt, Geoff; Boucher, Claude; Chao, Ben; Drewes, Hermann; Eanes, Richards; Feissel, Martine; Ferland, Remi; Herring, Tom; Holt, Bill; Johannson, Jan; Larson, Kristine; Ma, Chopo; Manning, John; Meertens, Chuck; Nothnagel, Axel; Pavlis, Erricos; Petit, Gerard; Ray, Jim; Ries, John; Scherneck, Hans‐Georg; Sillard, Patrick; Watkins, Mike (AGU Pubication, 2012-12-29)
      As early as the 15th century Swedes noticed that rocks in their harbors were slowly rising out of the sea [Ekman, 1991]. These local observations were not sufficient to distinguish whether the rocks were rising or the sea ...
    • A test of general relativity using the LARES and LAGEOS satellites and a GRACE Earth gravity model 

      Ciufolini, Ignazio; Paolozzi, Antonio; Pavlis, Erricos C.; Koenig, Rolf; Ries, John; Gurzadyan, Vahe; Matzner, Richard; Penrose, Roger; Sindoni, Giampiero; Paris, Claudio; Khachatryan, Harutyun; Mirzoyan, Sergey (Springer Berlin Heidelberg, 2016-03-04)
      We present a test of general relativity, the measurement of the Earth’s dragging of inertial frames. Our result is obtained using about 3.5 years of laser-ranged observations of the LARES, LAGEOS, and LAGEOS 2 laser-ranged ...
    • Testing General Relativity and gravitational physics using the LARES satellite 

      Ciufolini, Ignazio; Paolozzi, Antonio; Pavlis, Erricos; Ries, John; Gurzadyan, Vahe; Koenig, Rolf; Matzner, Richard; Penrose, Roger; Sindoni, Giampiero (Springer Nature, 2012-11-06)
      The discovery of the accelerating expansion of the Universe, thought to be driven by a mysterious form of “dark energy” constituting most of the Universe, has further revived the interest in testing Einstein’s theory of ...
    • Thermodynamic control -- an old paradigm with new applications 

      Deffner, Sebastian; Bonança, Marcus V. S. (2020-06-24)
      Tremendous research efforts have been invested in exploring and designing so-called shortcuts to adiabaticity. These are finite-time processes that produce the same final states that would result from infinitely slow ...
    • Thermodynamic length for far-from-equilibrium quantum systems 

      Deffner, Sebastian; Lutz, Eric (American Physical Society (APS), 2013-02-28)
      We consider a closed quantum system initially at thermal equilibrium and driven by arbitrary external parameters. We derive a lower bound on the entropy production which we express in terms of the Bures angle between the ...
    • Thermodynamic universality of quantum Carnot engines 

      Gardas, Bartłomiej; Deffner, Sebastian (American Physical Society (APS), 2015-10-12)
      The Carnot statement of the second law of thermodynamics poses an upper limit on the efficiency of all heat engines. Recently, it has been studied whether generic quantum features such as coherence and quantum entanglement ...
    • The Third Catalog of Active Galactic Nuclei detected by the Fermi Large Area Telescope 

      Ojha, Roopesh; Hewitt, J. W.; et al. (The American Astronomical Society, 2015-08-25)
      The third catalog of active galactic nuclei (AGNs) detected by the Fermi-LAT (3LAC) is presented. It is based on the third Fermi-LAT catalog (3FGL) of sources detected between 100 MeV and 300 GeV with a Test Statistic ...
    • Third-Order Nonlinear Optical Properties of ALD Grown TiO2 Thin Films 

      Kuis, R.; Basaldua, I.; Burkins, P.; Kropp, J. A.; Gougousi, T.; Johnson, A. M. (Optical Society of America, 2019-09-15)
      Nonlinear index values as high as 1±.1x10-9 cm2/W were measured of ALD based TiO2 films. The 1000-fold increase in the index is believed to be due to the incorporation of nitrogen during growth.