Procházení Acta Polytechnica CTU Proceedings. 2014, vol. 1, no. 1 dle data publikování

Zobrazují se záznamy 21-40 z 62

    • Multi-Frequency Study of the SZ Effect in Cosmic Structures 

      Autor: Colafrancesco, Sergio
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The Sunyaev-Zel’dovich effect (SZE) is a relevant probe for cosmology and astrophysics. A multi-frequency approach to study the SZE in cosmic structures turns out to be crucial in the use of this probe for astrophysics and ...

    • Evolution of Massive Population III Stars 

      Autor: Yoon, Sung-Chul
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      While the evolution of massive stars in the local Universe is dominated by mass-loss, the evolution of massive Population III stars should be dominated by rotation. An important effect of rotation is rotationally-induced ...

    • Astrophysics Without Black Holes, and Without Extragalactic Gamma-Ray Bursts 

      Autor: Kundt, Wolfgang
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      Contrary to common belief, it is argued that our Universe contains neither Black Holes, nor Extracalactic Gamma-Ray Bursts.

    • Star Formation in Tadpole Galaxies 

      Autor: Muñoz-Tuñon, Casiana; Almeida, Jorge Sanchez; Elmegreen, Debra M.; Elmegreen, Bruce G.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      Tadpole Galaxies look like a star forming head with a tail structure to the side. They are also named cometaries. In a series of recent works we have discovered a number of issues that lead us to consider them extremely ...

    • Recent Results from the SAFIR Project 

      Autor: Sánchez-Portal, M.; Castillo-Fraile, M.; Almeida, C. Ramos; Esquej, P.; Alonso-Herrero, A.; Pérez García, A. M.; Acosta-Pulido, J.; Altieri, B.; Bongiovanni, A.; Castro Céron, J. M.; Cepa, J.; Coia, D.; Conversi, L.; Fritz, J.; Gonzalez-Serrano, J. I.; Hatziminaoglou, E.; Povic, M.; Rodrguez Espinosa, J. M.; Valtchanov, I.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The "Seyfert and star formation Activity in the Far-Infrared" (SAFIR) project is aimed at studying the physical nature of the nuclear IR emission and star formation properties of a small sample of nearby Seyfert galaxies ...

    • Design and Tests of the Hard X-ray Polarimeter X-Calibur 

      Autor: Beilicke, M.; Cowsik, R.; Dowkontt, P.; Guo, Q.; Kislat, F.; Barthelmy, S.; Okajima, T.; Mitchell, J. W.; Schnittman, J.; Zeiger, B.; De Geronimo, G.; Baring, M. G.; Bodaghee, A.; Miyazawa, T.; Finkelstein, K. D.; Krawczynski, H.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      X-ray polarimetry promises to give qualitatively new information bout high-energy astrophysical sources, such as binary black hole  systems, micro-quasars, active galactic nuclei, and gamma-ray bursts. We designed, built ...

    • Modelling the Multifrequency SED of AGN Candidates among the Unidentied EGRET and Fermi Gamma-Ray Sources 

      Autor: Meintjes, Pieter J.; Nkundabakura, Pheneas; van Soelen, Brian; Odendaal, Alida
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      Of the 271 sources in the 3rd EGRET catalogue, 131 were reported as unidentied, i.e. not associated with any particular class of point source in the sky. Since the largest fraction of the EGRET sources were extragalactic, ...

    • Origin of X-ray Spectral Variation and the Seemingly Broad Iron-Line Spectral Feature in Seyfert Galaxies 

      Autor: Ebisawa, Ken; Iso, Naoki; Miyakawa, Takehiro; Inoue, Hajime
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      We present systematic X-ray data analysis of the Seyfert galaxies observed by Suzaku to study origin of their hard X-ray (2 - 40 keV) variations. In particular, we examine if the "Variable Partial Covering (VPC) model" ...

    • High-Resolution X-Ray Spectroscopy of Galactic Supernova Remnants 

      Autor: Katsuda, Satoru; Tsunemi, Hiroshi
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      High-resolution X-ray spectroscopy of Galactic supernova remnants (SNRs), based on grating spectrometers onboard XMM-Newton and Chandra, has been revealing a variety of new astrophysical phenomena. Broadened oxygen lines ...

    • Clustering Measurements of broad-line AGNs: Review and Future 

      Autor: Krumpe, Mirko; Miyaji, Takamitsu; Coil, Alison L.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      Despite substantial effort, the precise physical processes that lead to the growth of super-massive black holes in the centers of galaxies are still not well understood. These phases of black hole growth are thought to be ...

    • Multiscale Modeling of Astrophysical Jets 

      Autor: Beall, James H.; Guillory, John; Rose, David V.; Wolff, Michael T.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      We are developing the capability for a multi-scale code to model the energy deposition rate and momentum transfer rate of an astrophysical jet which generates strong plasma turbulence in its interaction with the ambient ...

    • The HiSCORE Project 

      Autor: Tluczykont, M.; Brückner, M.; Budnev, N.; Chvalaev, O.; Dyachok, A.; Epimakhov, S.; Gress, O.; Hampf, D.; Horns, D.; Ivanova, A.; Kalmykov, N.; Konstantinov, E.; Korosteleva, E.; Kozin, V.; Kunnas, M.; Kuzmichev, L.; Lubsandorzhiev, B.; Mirgazov, R.; Monkhoev, R.; Nachtigall, R.; Panasyuk, M.; Pakhorukov, A.; Poleschuk, V.; Porelli, A.; Prosin, V.; Ptuskin, V.; Rubtsov, G. I.; Satunin, P. S.; Semeney, Yu.; Spitschan, D.; Skukhin, A.; Sveshnikova, L.; Wischnewski, R.; Zagorodnikov, A.; Zirakashvili, V.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      A central question of Astroparticle Physics, the origin of cosmic rays, still remains unsolved. HiSCORE (Hundred*i Square-km Cosmic ORigin Explorer) is a concept for a large-area wide-angle non-imaging air shower detector, ...

    • Active Galactic Nuclei: Jets as the Source of Hadrons and Neutrinos 

      Autor: Meli, Athina; Ciarcelluti, Paolo
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      Active galactic nuclei are extragalactic sources, and their relativistic hot-plasma jets are believed to be the main candidates of the cosmic-ray origin, above the so-called knee region of the cosmic-ray spectrum. Relativistic ...

    • X-Ray and Near-Infrared Spectroscopy of Dim X-Ray Point Sources Constituting the Galactic Ridge X-Ray Emission 

      Autor: Morihana, Kumiko; Tsujimoto, Masahiro; Ebisawa, Ken
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      We present the results of X-ray and Near-Infrared observations of the Galactic Ridge X-ray Emission (GRXE). We extracted 2,002 X-ray point sources in the Chandra Bulge Field (l =0°.113, b = 1°.424) down to ~10-14.8 ergscm-2s-1 ...

    • First Hints of Pressure Waves in a Helical Extragalactic Jet: S5 0836+710 

      Autor: Perucho, Manel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      One of the open questions in extragalactic jet Astrophysics is related to the nature of the observed radio jet, namely whether it traces a pattern or the flow structure itself. In this paper I summarize the evidence collected ...

    • Highly Magnetized Accreting Pulsars: Are There Accreting Magnetars? 

      Autor: Blay, Pere; Reig, Pablo; Reglero, Víctor
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      2S 0114+650, GX 301-2, IGR J16358-4726, X Per, 4U 2206+54, SXP 1062, and 3A 1954+319 are thought to possess high magnetic elds. They have recently been named accreting magnetars, or highly magnetized accreting pulsars. In ...

    • Fullerenes, PAHs, Amino Acids and High Energy Astrophysics 

      Autor: Iglesias-Groth, Susana
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      We present theoretical, observational and laboratory work on the spectral properties of fullerenes and hydrogenated fullerenes. Fullerenes in its various forms (individual, endohedral, hydrogenated, etc.) can contribute ...

    • Unveiling the Nature of INTEGRAL Objects: a Review 

      Autor: Parisi, Pietro
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      Since its launch in October 2002, the INTEGRAL observatory has improved our knowledge of the hard X-ray sky above 20 keV, carrying out more than ten years of observations in the energy range from 5 keV to 8 MeV. The most ...

    • A Multi-Wavelength View of the XMM-Newton Galactic Plane 

      Autor: Gómez-Morán, Ada Nebot; Motch, Christian
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      We present an X-ray survey of the Galactic Plane conducted by the Survey Science Centre of the XMM-Newton satellite. The survey contains more than 1300 X-ray detections at low and intermediate Galactic latitudes and covering ...

    • Soft X-Ray Polarimeter: Potential Instrumentation and Observations 

      Autor: Marshall, Herman L.; Schulz, Norbert S.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      We present an instrument design capable of measuring linear X-ray polarization over a broad-band using conventional spectroscopic optics. A set of multilayer-coated flats reflects the dispersed X-rays to the instrument ...