Results 21 to 30 of about 2,720 (178)

Diverse properties of Ly α emission in low-redshift compact star-forming galaxies with extremely high [O iii]/[O ii] ratios [PDF]

Monthly notices of the Royal Astronomical Society, 2019
We present observations with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope of eight compact star-forming galaxies at redshifts z = 0.02811–0.06540, with low oxygen abundances 12 + log(O/H) = 7.43–7.82 and extremely high emission ...
Y. Izotov, D. Schaerer, G. Worseck, A. Verhamme, N. Guseva, T. Thuan, I. Orlitová, K. I. F. T. Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine, Max Planck Institut fur Radioastronomie, Bonn, Germany., Observatoire de Geneve, U. Geneve, Versoix, Switzerland., Irapcnrs, Toulouse, France., Institut fur Physik und Astronomie, U. Potsdam, Potsdam, A. Department, U. Virginia, Charlottesville, Usa, A. Institute, C. A. O. Sciences, Prague, Czech Republic., I. F. Astrophysik, Goettingen Universitat, Goettingen   +34 more
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J1154+2443: a low-redshift compact star-forming galaxy with a 46 per cent leakage of Lyman continuum photons [PDF]

, 2017
We report the detection of the Lyman continuum (LyC) radiation of the compact star-forming galaxy (SFG) J1154+2443 observed with the Cosmic Origins Spectrograph (COS) onboard the Hubble Space Telescope.
Y. Izotov, D. Schaerer, G. Worseck, N. Guseva, T. Thuan, A. Verhamme, I. Orlitová, K. Observatory, Ukrainian National Academy of Sciences, Kyiv, Ukraine, M. F. Radioastronomie, Bonn, Germany., Observatoire de Geneve, U. Geneve, Versoix, Switzerland., Irapcnrs, 14, Toulouse, France., M. F. Astronomie, Heidelberg, Institut fur Physik und Astronomie, U. Potsdam, Potsdam, A. Department, U. Virginia, Charlottesville, Usa, A. Institute, C. A. O. Sciences, Prague, Czech Republic., I. F. Astrophysik, Goettingen Universitat, Goettingen   +37 more
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Simulating observable structures due to a perturbed interstellar medium in front of astrospheric bow shocks in 3D MHD [PDF]

Astronomy & Astrophysics, 2021
Context. While the shapes of many observed bow shocks can be reproduced by simple astrosphere models, more elaborate approaches have recently been used to explain differing observable structures. Aims. By placing perturbations of an otherwise homogeneous
L. Baalmann, K. Scherer, J. Kleimann, H. Fichtner, D. Bomans, Kerstin Weis Ruhr-Universitat Bochum, Fakultat fur Physik und Astronomie, IV InstitutfurTheoretischePhysik, Ruhr-Universitát Bochum, R. Department, Plasmas with Complex Interactions, Ruhr Astroparticle, Plasma Physics Center, A. Institut   +13 more
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Imprints of the first billion years: Lyman limit systems atz∼ 5 [PDF]

Monthly notices of the Royal Astronomical Society, 2018
Lyman Limit systems (LLSs) trace the low-density circumgalactic medium and the most dense regions of the intergalactic medium, so their number density and evolution at high redshift, just after reionisation, are important to constrain.
N. Crighton, J. Prochaska, M. Murphy, J. O’Meara, G. Worseck, Britton D. Smith Swinburne University of Technology, U. Cruz, Saint Michael's College, M. F. Astronomie, Institut fur Physik und Astronomie, U. Diego   +10 more
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On the ring nebulae around runaway Wolf–Rayet stars [PDF]

, 2020
Wolf-Rayet stars are advanced evolutionary stages of massive stars. Despite their large mass-loss rates and high wind velocities, none of them display a bow shock, although a fraction of them are classified as runaway.
D. Meyer, L. Oskinova, M. Pohl, M. P. U. Potsdam, Institut fur Physik und Astronomie, Potsdam, G. D. F. Astronomy, Kazan Federal University, Kazan, R. Desy, Zeuthen, Germany Max Planck Computing, D. Facility, Garching, Germany.   +14 more
semanticscholar   +1 more source

URSA-PQ: A Mobile and Flexible Pump-Probe Instrument for Gas Phase Samples at the FLASH Free Electron Laser

Applied Sciences, 2020
We present a highly flexible and portable instrument to perform pump-probe spectroscopy with an optical and an X-ray pulse in the gas phase. The so-called URSA-PQ (German for ‘Ultraschnelle Röntgenspektroskopie zur Abfrage der Photoenergiekonversion an ...
Jan Metje, Fabiano Lever, Dennis Mayer, Richard James Squibb, Matthew S. Robinson, Mario Niebuhr, Raimund Feifel, Stefan Düsterer, Markus Gühr   +8 more
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Light-cone distribution amplitudes of the nucleon and ∆ baryon

Journal of High Energy Physics, 2021
We investigate the light-cone wave functions and leading-twist distribution amplitudes for the nucleon and ∆ baryon within the framework of the chiral quark-soliton model.
June-Young Kim, Hyun-Chul Kim, Maxim V. Polyakov   +2 more
doaj   +1 more source

Validation of Monte Carlo Simulations for an analysis chain in H.E.S.S. [PDF]

Proceedings of 7th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy — PoS(Gamma2022), 2023
Imaging Air Cherenkov Telescopes (IACTs) detect very high energetic (VHE) gamma rays. They observe the Cherenkov light emitted in electromagnetic shower cascades that gamma rays induce in the atmosphere.
Fabian Leuschner, J. Schafer, S. Steinmassl, T. Holch, K. Bernlohr, S. Funk, J. Hinton, S. Ohm, Gerd Puhlhofer Institut fur Astronomie und Astrophysik Tubingen, E. Tubingen, Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universitat Erlangen-Nurnberg, M. Kernphysik, D. Elektronen-Synchrotron   +13 more
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The Tenth International Workshop on MULTIFREQUENCY BEHAVIOUR OF HIGH ENERGY COSMIC SOURCES Palermo, Italy, 2013

Acta Polytechnica CTU Proceedings, 2014
Organizing Institutions:Istituto di Astrofisica e Planetologia Spaziali IAPS-INAF, Roma, ItalyDpt de Cargas Utiles y Ciencias del Espacio, DCUCE-INTA Madrid, SpainE.O. Hulburt Center for Space Research, HCA-NRL, Washington D.C., USAMax-Planck Institut fr
Editorial, Foreword
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Ultrafast Photo-Ion Probing of the Relaxation Dynamics in 2-Thiouracil

Molecules, 2023
In this work, we investigate the relaxation processes of 2-thiouracil after UV photoexcitation to the S2 state through the use of ultrafast, single-colour, pump-probe UV/UV spectroscopy. We place focus on investigating the appearance and subsequent decay
Matthew Scott Robinson, Mario Niebuhr, Markus Gühr   +2 more
doaj   +1 more source