Book reviews     

Tlamicha  Antonín  Podolský  Jiří 《Astrophysics and Space Science》1986,120(2):307-308

Astrophysics and Space Science -  相似文献   

OPserver: interactive online computations of opacities and radiative accelerations     

C. Mendoza  M. J. Seaton  P. Buerger  A. Bellorín  M. Meléndez †  J. González  L. S. Rodríguez  F. Delahaye  E. Palacios  A. K. Pradhan  C. J. Zeippen 《Monthly notices of the Royal Astronomical Society》2007,378(3):1031-1035

Codes to compute mean opacities and radiative accelerations for arbitrary chemical mixtures using the Opacity Project recently revised data have been restructured in a client–server architecture and transcribed as a subroutine library. This implementation increases efficiency in stellar modelling where element stratification due to diffusion processes is depth dependent, and thus requires repeated fast opacity re-estimates. Three user modes are provided to fit different computing environments, namely, a web browser, a local workstation and a distributed grid.  相似文献   

The search for hot spots associated with the Cygnus X-3 relativistic jet     

J. Martí  D. Pérez-Ramírez  P. Luque-Escamilla  J. L. Garrido  J. M. Paredes  A. Muñoz-Arjonilla  J. R. Sánchez-Sutil 《Astrophysics and Space Science》2007,309(1-4):309-313

We report and shortly discuss here the observational work carried out in order to test the possibility that two previously detected radio sources, in the vicinity of the well known microquasar Cygnus X-3, could be hot spot tracers of interaction between its relativistic jet and the interstellar medium (ISM). The motivation behind this search is in part justified considering recent theoretical models of high energy γ-ray emission which strongly rely on the interaction sites of galactic relativistic jets with nearby ISM clouds. The results presented in this paper include an improved radio exploration of the several arc-minute field around Cygnus X-3 using the Very Large Array (VLA), as well as deep near infrared (NIR) imaging with the Calar Alto 3.5 m telescope. We anticipate here that our observations do not appear to support the initial hot spot hypothesis. Instead, the resulting images suggest that the two radio sources, originally believed to be hot spot candidates, are most likely background or foreground objects.  相似文献   

Bibliography     

Z. Kopal  M. Moutsoulas  F. B. Waranius 《Earth, Moon, and Planets》1980,22(4):439-509

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Observations of active galactic nuclei with the GT-48 CrAO gamma-ray telescope in 2004     

Yu. I. Neshpor  V. S. Eliseev  N. A. Jogolev  E. M. Nehay  Z. N. Skiruta  V. V. Fidelis  V. P. Fomin 《Bulletin of the Crimean Astrophysical Observatory》2007,103(1):16-20

Observations of several active galactic nuclei were performed with the GT-48 gamma-ray telescope at CrAO in 2004: 3C 66A, Mk 421, Mk 501, 1H 1426, 1ES 1959, and BL Lac. Very-high-energy (E ≥ 10¹² eV) gamma-ray fluxes were recorded from 3C 66A, Mk 421, Mk 501, and 1H 1426 at a confidence level of more than 4σ. Upper limits for the flux of very-high-energy gamma rays are presented for 1ES 1959 and BL Lac. The 2004 observational data for 3C 66A (z = 0.44) confirm the results obtained previously at CrAO.  相似文献   

The drift model of “magnetars”     

I. F. Malov  G. Z. Machabeli 《Astrophysics and Space Science》2007,308(1-4):467-469

It is shown that the drift waves near the light cylinder can cause the modulation of emission with periods of order several seconds. These periods explain the intervals between successive pulses observed in AXPs, SGRs and radio pulsars with long periods. The model under consideration gives the possibility to calculate real rotation periods P of host neutron stars. It is shown that P≤1 s for the investigated objects. The magnetic fields at the surface of the neutron star are of order 10¹¹–10¹³ G and equal to the fields usual for the known radio pulsars.   相似文献   

The host galaxies of long-duration gamma-ray bursts in a cosmological hierarchical scenario     

Sebastián E. Nuza  Patricia B. Tissera  Leonardo J. Pellizza  Diego G. Lambas  Cecilia Scannapieco †  María E. De Rossi 《Monthly notices of the Royal Astronomical Society》2007,375(2):665-672

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Giant Lyα nebulae around z > 2 radio galaxies: evidence for infall     

A. Humphrey  M. Villar-Martín  R. Fosbury  L. Binette  J. Vernet  C. De Breuck  S. di Serego Alighieri 《Monthly notices of the Royal Astronomical Society》2007,375(2):705-714

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Multifractal analysis as a tool for validating a rainfall model     

A. P. García‐Marín  F. J. Jiménez‐Hornero  J. L. Ayuso‐Muñoz 《水文研究》2008,22(14):2672-2688

A multifractal analysis was carried out in order to validate the simulation of hourly rainfall records of a local climate model for the Iberian Peninsula. Observed and simulated hourly rainfall data from four locations in Andalusia (southern Spain) were used to carry out the study. In order to detect the influence of the length of the data series on the results, two different sizes were used for the real data: 4 years, and 20 years. The results show that algebraic tails are required to fit the probability distribution of extreme rain event sizes, and rain and dry event durations for both kinds of rainfall data. Similar results are found for the extreme rain event sizes and dry event durations fits when the real and synthetic data are considered. Nevertheless, some differences appear in the cases of rain event durations. The detection of the presence of a first‐order multifractal phase transition associated with a critical moment in the empirical moment scaling exponent function and the results of the extreme rain event sizes fits, reveal that real rainfall is a self‐organized criticality (SOC) process. That behaviour is less evident in the simulated rainfall series. The same ‘synoptic maximum’ value was found for each place with both types of rainfall data. A time clustering analysis was carried out applying the count‐based periodogram and the Fano factor methods. Some periodicities have been detected in the periodograms, especially for the longest real rainfall data series. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

Reflection experiment on a floating ice platform     

Z. Hajnal  A. Overton 《Geophysical Journal International》1987,89(1):201-208

Summary. Preliminary analysis of a multifold seismic survey on a floating ice platform, northwest of Axel Heiberg Island, along the Canadian portion of the continental margin of the Arctic Ocean revealed a structurally complex basement at a depth beyond 4000 m. The basement is covered with high velocity (5000 m/sec) rock types. The results conform to the anticipated geologic model for regions of passive margins.  相似文献