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  • 1
    Electronic Resource
    Electronic Resource
    An apparently normal γ -ray burst with an unusually low luminosity (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 430 (2004), S. 646-648 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Much of the progress in understanding γ-ray bursts (GRBs) has come from studies of distant events (redshift z ≈ 1). In the brightest GRBs, the γ-rays are so highly collimated that the events can be seen across the Universe. It has long been suspected that the nearest and most ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02748
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  • 2
    Electronic Resource
    Electronic Resource
    Erection of loam soil hydraulic spoil banks in hydraulicking of the over-burden (1972)
    Springer
    Power technology and engineering 6 (1972), S. 449-452 
    Details
    ISSN: 1570-1468
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02377379
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  • 3
    Electronic Resource
    Electronic Resource
    Hydraulic filling of earth structures using (1975)
    Springer
    Power technology and engineering 9 (1975), S. 531-535 
    Details
    ISSN: 1570-1468
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02378505
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  • 4
    Electronic Resource
    Electronic Resource
    ART-P/Granat observations of the X-ray pulsar 4U0115+634 during the outburst in February 1990 (2000)
    Springer
    Astronomy letters 26 (2000), S. 1-8 
    Details
    ISSN: 1562-6873
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Observations of the transient X-ray pulsar 4U0115+634 with the ART-P telescope aboard the Granat Observatory during the outburst in February 1990 are presented. The source exhibited a strong, regular and irregular variability, including X-ray bursts of duration 300–500 s. Two absorption features were detected in the source's photon spectrum at ∼12 and ∼22 keV, which were interpreted as the lines of resonance scattering of its emission at the first and second cyclotron harmonics. The magnetic-field strength B on the neutron-star surface that corresponds to these lines is ∼1.3 × 1012 G. The ratio of the line energies slightly differs from the harmonic ratio 1: 2. Moreover, this ratio and the line energies themselves vary appreciably with phase on a time scale of one pulsation period. The dependence of other spectral parameters for 4U0115+634 on pulse phase is investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.20363
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  • 5
    Electronic Resource
    Electronic Resource
    X-ray variability of the pulsar Vela X-1 as observed with ART-P/Granat (2000)
    Springer
    Astronomy letters 26 (2000), S. 765-771 
    Details
    ISSN: 1562-6873
    Keywords: neutron stars ; pulsars ; X-ray sources
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Observations of the X-ray pulsar Vela X-1 with the ART-P telescope onboard the Granat Observatory are presented. Variability on a time scale of several thousand seconds was detected; intensity variations are shown to be accompanied by changes in the source’s spectrum. The hardness was also found to be highly variable on a scale of one pulsation period. The source’s spectrum exhibits an absorption feature at energy ∼7 keV, which is apparently attributable to cyclotron scattering/absorption in the neutron-star magnetic field. Weak persistent emission was detected during an X-ray eclipse, which probably resulted from the scattering of pulsar emission in the stellar wind from an optical star.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1331156
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  • 6
    Electronic Resource
    Electronic Resource
    Spectral variability of the X-ray pulsar Hercules X-1 (2000)
    Springer
    Astronomy letters 26 (2000), S. 691-698 
    Details
    ISSN: 1562-6873
    Keywords: pulsars ; neutron stars ; X-ray sources ; scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the results of our comparative timing and spectral analysis of the high and low (off) states in the X-ray pulsar Her X-1 based on data from the ART-P telescope onboard the Granat observatory. A statistically significant (several mCrab) persistent flux with a simple power-law spectrum was detected during the low state. The spectral slope changed from observation to observation by almost a factor of 2. Pulsations were detected only during the high state of the source, when its flux was a factor of ∼25 larger than the low-state flux. The spectral shape of Her X-1 in its high state was complex, with the parameters depending on pulse phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1323276
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  • 7
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    Galactic survey of 44Ti sources with the IBIS telescope onboard INTEGRAL (2016)
    Oxford University Press
    Details
    Publication Date: 2016-04-04
    Description: We report the results of the deepest Galactic plane (| b | 〈 17 $_{.}^{\circ}$ 5) survey in the 67.9 and 78.4 keV nuclear de-excitation lines of titanium-44 ( 44 Ti) performed using the data acquired with the IBIS/ISGRI instrument onboard the INTEGRAL satellite during 12 yr of operation. The peak sensitivity of our survey reached an unprecedented level of 4.8 x 10 –6 ph cm –2  s –1 (3) that improves the sensitivity of the survey done by Compton Gamma-Ray Observatory /COMPTEL by a factor of ~5. As a result, constraining upper limits for all sources from the catalogue of Galactic supernova remnants (SNRs; Green 2014 ) are derived. These upper limits can be used to estimate the exposure needed to detect 44 Ti emission from any known SNR using existing and prospective X- and gamma-ray telescopes. Among the youngest Galactic SNRs, only Cas A shows significant 44 Ti emission flux in good agreement with the NuSTAR measurements. We did not detect any other sources of titanium emission in the Galactic plane at significance level higher than 5 confirming previous claims of the rarity of such 44 Ti-producing SNRs.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 8
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    2S 1553-542: a Be/X-ray binary pulsar on the far side of the Galaxy (2016)
    Oxford University Press
    Details
    Publication Date: 2016-09-03
    Description: We report the results of a comprehensive analysis of X-ray ( Chandra and Swift observatories), optical (Southern African Large Telescope, SALT ) and near-infrared (the VVV survey) observations of the Be/X-ray binary pulsar 2S 1553–542. Accurate coordinates for the X-ray source are determined and are used to identify the faint optical/infrared counterpart for the first time. Using VVV and SALTICAM photometry, we have constructed the spectral energy distribution (SED) for this star and found a moderate NIR excess that is typical for Be stars and arises due to the presence of circumstellar material (disc). A comparison of the SED with those of known Be/X-ray binaries has allowed us to estimate the spectral type of the companion star as B1-2V and the distance to the system as 〉15 kpc. This distance estimation is supported by the X-ray data and makes 2S 1553–542 one of the most distant X-ray binaries within the Milky Way, residing on the far side in the Scutum-Centaurus arm or even further.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 9
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    NuSTAR discovery of a cyclotron absorption line in the transient X-ray pulsar 2S 1553-542 (2016)
    Oxford University Press
    Details
    Publication Date: 2016-01-22
    Description: We report the results of a spectral and timing analysis of the poorly studied transient X-ray pulsar 2S 1553–542 using data collected with the NuSTAR and Chandra observatories and the Fermi /GBM instrument during an outburst in 2015. The properties of the source at high energies (〉30 keV) are studied for the first time and the sky position has been essentially improved. The source broad-band spectrum has a quite complicated shape and can be reasonably described by a composite model with two continuum components – a blackbody emission with the temperature about 1 keV at low energies and a power law with an exponential cut-off at high energies. Additionally, an absorption feature at ~23.5 keV is discovered both in phase-averaged and phase-resolved spectra and interpreted as the cyclotron resonance scattering feature corresponding to the magnetic field strength of the neutron star B  ~ 3  x  10 12  G. Based on the Fermi /GBM data, the orbital parameters of the system were substantially improved, which allowed us to determine the spin period of the neutron star P  = 9.27880(3) s and a local spin-up $\dot{P} \simeq -7.5 \times 10^{-10}$  s s –1 due to the mass accretion during the NuSTAR observations. Assuming accretion from the disc and using standard torque models, we estimated the distance to the system as d  = 20 ± 4 kpc.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 10
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    Spin-up/spin-down of neutron star in Be-X-ray binary system GX 304-1 (2014)
    Oxford University Press
    Details
    Publication Date: 2014-11-16
    Description: We analyse spin-up/spin-down of the neutron star in Be-X-ray binary system GX 304-1 observed by Swift /X-ray telescope (XRT) and Fermi /gamma-ray burst monitor (GBM) instruments in the period of the source activity from 2010 April to 2013 January and discuss possible mechanisms of angular momentum transfer to/from the neutron star. We argue that the neutron star spin-down at quiescent states of the source with an X-ray luminosity of L x  ~ 10 34  erg s –1 between a series of Type I outbursts and spin-up during the outbursts can be explained by quasi-spherical settling accretion on to the neutron star. The outbursts occur near the neutron star periastron passages, where the density is enhanced due to the presence of an equatorial Be-disc tilted to the orbital plane. We also propose an explanation to the counterintuitive smaller spin-up rate observed at higher luminosity in a double-peak Type I outburst due to lower value of the specific angular momentum of matter captured from the quasi-spherical wind from the Be-star by the neutron star moving in an elliptical orbit with eccentricity e   0.5.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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