Publications (37)
Normalized and Asynchronous Mirror Alignment for Cherenkov Telescopes
M. L. Ahnen, D. Baack, M. Balbo +29
Imaging Atmospheric Cherenkov Telescopes (IACTs) need imaging optics with large apertures and high image intensities to map the faint Cherenkov light emitted from cosmic ray air sh…
Analysis of Isobar Observables, with Improved Quark Distribution Amplitudes
N. G. Stefanis, M. Bergmann
A model distribution amplitude for the isobar is proposed, derived on the basis of the QCD sum-rule calculations of Farrar et al. combined with those of Carlson and…
Large-order trend of the anomalous-dimensions spectrum of trilinear twist-3 quark operators
M. Bergmann, W. Schroers, N. G. Stefanis
The anomalous dimensions of trilinear-quark operators are calculated at leading twist by diagonalizing the one-gluon exchange kernel of the renormalization-group type evoluti…
A Critical Analysis of the Proton Form Factor with Sudakov Suppression and Intrinsic Transverse Momentum
J. Bolz, R. Jakob, P. Kroll +2
The behavior of the proton magnetic form factor is studied within the modified hard scattering picture, which takes into account gluonic radiative corrections in terms of transvers…
Echoes from Ancient Supernovae in the Large Magellanic Cloud
A. Rest, N. B. Suntzeff, K. Olsen +13
In principle, the light from historical supernovae could still be visible as scattered-light echoes even centuries later. However, while echoes have been discovered around some nea…
Assessing the Impact of Alpha Particles on Thermal Confinement in JET D-T Plasmas through Global GENE-Tango Simulations
A. Di Siena, J. Garcia, R. Bilato +14
The capability of the global, electromagnetic gyrokinetic GENE code interfaced with the transport Tango solver is exploited to address the impact of fusion alpha particles (in thei…
Pepturbative and Nonperturbative Aspects of Exclusive Processes
N. G. Stefanis, M. Bergmann
Invited talk presented at the Workshop on Quantum Field Theoretical Aspects of High Energy Physics, Kyffhäuser, Germany, September 20-24, 1993; to be published in the Proceedings.
The Role of Exploding QSOs in Explosive Models of Evolution, Formation and End of Galaxies
S. Lipari, M. Bergmann, S. F. Sanchez +7
In this work we analise the role and evidence of exploding BAL + IR + Fe II QSOs, and their relation with new -and previous- explosive models for evolution, formation and end of ga…
On the Nucleon Distribution Amplitude: The Heterotic Solution
N. G. Stefanis, M. Bergmann
We present a new nucleon distribution amplitude which amalgamates features of the Chernyak-Ogloblin-Zhitnitsky model with those of the Gari-Stefanis model. This "heterotic" solutio…
First-Principles Explanation of the Drift Configuration Dependence of the Radial Electric Field and High-Confinement Access in Tokamaks
B. J. Frei, R. Bilato, O. Grover +6
The origin of the difference in the high-confinement (H-mode) power threshold between favorable and unfavorable drift configurations in tokamaks, experimentally linked to a deeper…
Coronal bright point statistics I. Lifetime, shape, and coronal co-rotation
I. Kraus, Ph. -A. Bourdin, J. Zender +2
Context. The corona of the Sun is the part of the solar atmosphere with temperatures of over one million Kelvin, which needs to be heated internally in order to exist. This heating…
Mirror Position Determination for the Alignment of Cherenkov Telescopes
J. Adam, M. L. Ahnen, D. Baack +27
Imaging Atmospheric Cherenkov Telescopes (IACTs) need imaging optics with large apertures to map the faint Cherenkov light emitted in extensive air showers onto their image sensors…
Nucleon Distribution Amplitudes and Observables
N. G. Stefanis, M. Bergmann
Invited talk presented at the International Workshop on Hadron Structure '93, Banská \v Stiavnica, Slovakia, 5-10 September, 1993; to be published in the Proceedings.
Asymmetry in the Outburst of SN 1987A Detected Using Light Echo Spectroscopy
B. Sinnott, D. L. Welch, A. Rest +2
We report direct evidence for asymmetry in the early phases of SN 1987A via optical spectroscopy of five fields of its light echo system. The light echoes allow the first few hundr…
GEMINI 3D spectroscopy of BAL+IR+Fe II QSOs: II. IRAS 04505-2958 an explosive QSO with hypershell and a new scenario for galaxy formation and galaxy end
S. Lipari, M. Bergmann, S. F. Sanchez +9
From a study of BAL + IR + Fe II QSOs (using deep Gemini GMOS-IFU spectroscopy) new results are presented: for IRAS 04505-2958. Specifically, we have studied in detail the out flow…
FACT - Monitoring Blazars at Very High Energies
D. Dorner, M. L. Ahnen, M. Bergmann +26
The First G-APD Cherenkov Telescope (FACT) was built on the Canary Island of La Palma in October 2011 as a proof of principle for silicon based photosensors in Cherenkov Astronomy.…
Direct Confirmation of the Asymmetry of the Cas A Supernova with Light Echoes
A. Rest, R. J. Foley, B. Sinnott +21
We report the first detection of asymmetry in a supernova (SN) photosphere based on SN light echo (LE) spectra of Cas A from the different perspectives of dust concentrations on it…
Spectral Identification of an Ancient Supernova using Light Echoes in the LMC
A. Rest, T. Matheson, S. Blondin +26
We report the successful identification of the type of the supernova responsible for the supernova remnant SNR 0509-675 in the Large Magellanic Cloud (LMC) using Gemini spectra of…
Gemini/GMOS Transmission Spectral Survey: Complete Optical Transmission Spectrum of the hot Jupiter WASP-4b
C. M. Huitson, J-. M Desert, J. L. Bean +3
We present the complete optical transmission spectrum of the hot Jupiter WASP-4b from 440-940 nm at R ~ 400-1500 obtained with the Gemini Multi-Object Spectrometers (GMOS); this is…
Bokeh Mirror Alignment for Cherenkov Telescopes
M. L. Ahnen, D. Baack, M. Balbo +29
Imaging Atmospheric Cherenkov Telescopes (IACTs) need imaging optics with large apertures and high image intensities to map the faint Cherenkov light emitted from cosmic ray air sh…
The Sunrise Ultraviolet Spectropolarimeter and Imager: Instrument description
A. Feller, A. Gandorfer, B. Grauf +46
The third science flight of the balloon-borne solar observatory Sunrise carries three entirely new post-focus science instruments with spectropolarimetric capabilities, concurrentl…
Temperature-controlled interlayer exchange coupling in strong/weak ferromagnetic multilayers: a thermo-magnetic Curie-switch
A. Kravets, A. N. Timoshevskii, B. Z. Yanchitsky +4
We investigate a novel type of interlayer exchange coupling based on driving a strong/weak/strong ferromagnetic tri-layer through the Curie point of the weakly ferromagnetic spacer…
Stellar population gradients and spatially resolved kinematics in luminous post-starburst galaxies
M. B. Pracy, S. Croom, E. Sadler +7
We have used deep integral field spectroscopy obtained with the GMOS instrument on Gemini-North to determine the spatial distribution of the post-starburst stellar population in fo…
Heterotic Approach to the Nucleon Distribution Amplitude
M. Bergmann, N. G. Stefanis
We give an in-depth analysis of the determination procedure of the recently proposed heterotic nucleon distribution amplitude which hybridizes the best features of the Chernyak-Ogl…
Deep GEMINI GMOS-IFU spectroscopy of BAL QSOs: I. Decoupling the BAL, QSO, starburst, NLR, supergiant bubbles and galactic wind in Mrk 231
S. Lipari, S. F. Sanchez, M. Bergmann +9
In this work we present the first results of a study of BAL QSOs (at low and high redshift), based on very deep Gemini GMOS integral field spectroscopy. In particular, the results…
Evolution Effects on the Nucleon Distribution Amplitude
M. Bergmann, N. G. Stefanis
We study the Brodsky-Lepage evolution equation for the nucleon and construct an eigenfunction basis by including contributions of up to polynomial order . By exployting the perm…
The Polarimetric and Helioseismic Imager on Solar Orbiter
S. K. Solanki, J. C. del Toro Iniesta, J. Woch +121
This paper describes the Polarimetric and Helioseismic Imager on the Solar Orbiter mission (SO/PHI), the first magnetograph and helioseismology instrument to observe the Sun from o…
Strong Gravitational Lensing by the Super-massive cD Galaxy in Abell 3827
E. R. Carrasco, P. L. Gomez, T. Verdugo +6
We have discovered strong gravitational lensing features in the core of the nearby cluster Abell 3827 by analyzing Gemini South GMOS images. The most prominent strong lensing featu…
Scattered-Light Echoes from the Historical Galactic Supernovae Cassiopeia A and Tycho (SN 1572)
A. Rest, D. L. Welch, N. B. Suntzeff +16
We report the discovery of an extensive system of scattered light echo arclets associated with the recent supernovae in the local neighbourhood of the Milky Way: Tycho (SN 1572) an…
On Proton and Delta Wave Functions
N. G. Stefanis, M. Bergmann
Physical wave functions for the nucleon and the isobar are presented, which unify the best features of previous models. With these wave functions we can calculate elastic…
Data compression for the First G-APD Cherenkov Telescope
M. L. Ahnen, M. Balbo, M. Bergmann +27
The First Geiger-mode Avalanche photodiode (G-APD) Cherenkov Telescope (FACT) has been operating on the Canary island of La Palma since October 2011. Operations were automated so t…
IR mergers and IR QSOs with galactic winds. III. Mrk 231: composite outflow with multiple expanding bubbles and BALs (an exploding young QSO?)
S. Lipari, R. Terlevich, W. Zheng +3
A study of outflow (OF) and BAL systems in Mrk 231 (and in similar IR QSOs) is presented. This study is based mainly on 1D and 2D spectroscopy (obtained at La Palma/WHT, HST, IUE,…
Global gyrokinetic simulations of ASDEX Upgrade up to the transport time-scale with GENE-Tango
A. Di Siena, A. Banon Navarro, T. Luda +12
An accurate description of turbulence up to the transport time scale is essential for predicting core plasma profiles and enabling reliable calculations for designing advanced scen…
Intrinsic Transverse Size Effect
J. Bolz, R. Jakob, P. Kroll +2
Two recently proposed concepts to improve the perturbative calculation of exclusive amplitudes, gluonic radiative corrections (Sudakov factor) and confinement size effects (intrins…
Coronal bright point statistics II. Magnetic polarities and mini loops
I. Kraus, Ph. -A. Bourdin, J. Zender +2
Context. The solar corona maintains temperatures of a million Kelvin or more. The plasma heating mechanisms responsible for these extreme temperatures are still unclear. Large regi…
Unveiling the growth mode diagram of GaSe on sapphire
M. Bissolo, M. Dembecki, J. Belz +10
The growth of two-dimensional epitaxial materials on industrially relevant substrates is critical for enabling their scalable synthesis and integration into next-generation technol…
Gemini GMOS IFU Spectroscopy of IRAS 04505-2958: A New Exploding BAL + IR + Fe II QSO
S. Lipari, M. Bergmann, S. Sanchez +7
New results of a Programme of study of BAL + IR + Fe II QSOs (at low and high redshift) are presented. Which are based mainly on deep Gemini GMOS integral field unit (IFU/3D) spect…