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  • World Scientific Pub Co Pte Ltd  (8)
  • 1
    Online Resource
    Online Resource
    MOPRA AND NANTEN STUDIES OF HESS J1825-137 NORTHERN CLOUD
    World Scientific Pub Co Pte Ltd ; 2014
    In:  International Journal of Modern Physics: Conference Series Vol. 28 ( 2014-01), p. 1460199-
    Details
    In: International Journal of Modern Physics: Conference Series, World Scientific Pub Co Pte Ltd, Vol. 28 ( 2014-01), p. 1460199-
    Abstract: The Pulsar Wind Nebula (PWN) HESS J1825-137 is one of the most extended TeV PWN and its morphology is influenced by the molecular gas located north of the TeV sources. In order to refine the composition and dynamics of the cloud, we have used the telescope Mopra in the 7 and 12 mm bands. Our results highlight dense regions and also perturbations in the southern part of the dense cloud.
    Type of Medium: Online Resource
    ISSN: 2010-1945 , 2010-1945
    URL: Article
    DOI: 10.1142/S2010194514601999
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2014
    detail.hit.zdb_id: 2704621-7
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  • 2
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    Online Resource
    PARTICLE ACCELERATION CLOSE TO THE SUPERMASSIVE BLACK HOLE HORIZON: THE CASE OF M87
    World Scientific Pub Co Pte Ltd ; 2008
    In:  International Journal of Modern Physics D Vol. 17, No. 09 ( 2008-09), p. 1569-1575
    Details
    In: International Journal of Modern Physics D, World Scientific Pub Co Pte Ltd, Vol. 17, No. 09 ( 2008-09), p. 1569-1575
    Abstract: The radio galaxy M87 has recently been found to be a rapidly variable TeV emitting source. We analyze the implications of the observed TeV characteristics and show that it proves challenging to account for them within conventional acceleration and emission models. We discuss a new pulsar-type scenario for the origin of variable, very high energy (VHE) emission close to the central supermassive black hole and show that magneto-centrifugally accelerated electrons could efficiently Compton upscatter sub-mm ADAF disk photons to the TeV regime, leading to VHE characteristics close to those observed. This suggests, conversely, that VHE observations of highly under-luminous AGNs could provide an important diagnostic tool for probing the conditions prevalent in the inner accretion disk of these sources.
    Type of Medium: Online Resource
    ISSN: 0218-2718 , 1793-6594
    URL: Article
    DOI: 10.1142/S0218271808013169
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2008
    SSG: 16,12
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  • 3
    Online Resource
    Online Resource
    HYDRODYNAMICS OF INTERACTION OF PULSAR AND STELLAR WINDS AND ITS IMPACT ON THE HIGH ENERGY RADIATION OF BINARY PULSAR SYSTEMS
    World Scientific Pub Co Pte Ltd ; 2008
    In:  International Journal of Modern Physics D Vol. 17, No. 10 ( 2008-09), p. 1909-1915
    Details
    In: International Journal of Modern Physics D, World Scientific Pub Co Pte Ltd, Vol. 17, No. 10 ( 2008-09), p. 1909-1915
    Abstract: The hydrodynamics of the interaction of pulsar and stellar winds in binary systems harboring a pulsar and its impact on the nonthermal radiation of the binary pulsar PSR B1259-63/SS2883 is discussed. The collision of an ultrarelativistic pulsar wind with a nonrelativistic stellar outflow results in significant bulk acceleration of the shocked material from the pulsar wind. Already at distances comparable to the size of the binary system, the Lorentz factor of the shocked flow can be as large as γ ~ 4. This results in significant anisotropy of the inverse Compton radiation of accelerated electrons. Because of the Doppler boosting of the produced radiation, one should expect a variable gamma-ray signal from the system. In particular, this effect may naturally explain the reported tendency of a decrease of TeV gamma-ray flux close to the periastron. The modeling of the interaction of pulsar and stellar winds allows self-consistent calculations of adiabatic losses. Our results show that adiabatic losses dominate over the radiative losses. These results have direct impact on the orbital variability of radio, X-ray and gamma-ray signals detected from the binary pulsar PSR B1259-63/SS2883.
    Type of Medium: Online Resource
    ISSN: 0218-2718 , 1793-6594
    URL: Article
    DOI: 10.1142/S021827180801356X
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2008
    SSG: 16,12
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  • 4
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    Online Resource
    Preface
    World Scientific Pub Co Pte Ltd ; 2018
    In:  International Journal of Modern Physics D Vol. 27, No. 10 ( 2018-07), p. 1802005-
    Details
    In: International Journal of Modern Physics D, World Scientific Pub Co Pte Ltd, Vol. 27, No. 10 ( 2018-07), p. 1802005-
    Type of Medium: Online Resource
    ISSN: 0218-2718 , 1793-6594
    URL: Article
    DOI: 10.1142/S0218271818020054
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2018
    SSG: 16,12
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  • 5
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    Online Resource
    INVESTIGATION OF DENSE GAS TOWARDS RELATIVISTIC OUTFLOW SOURCES
    World Scientific Pub Co Pte Ltd ; 2014
    In:  International Journal of Modern Physics: Conference Series Vol. 28 ( 2014-01), p. 1460198-
    Details
    In: International Journal of Modern Physics: Conference Series, World Scientific Pub Co Pte Ltd, Vol. 28 ( 2014-01), p. 1460198-
    Abstract: We probe the interstellar medium towards the objects Circinus X-1, a low-mass X-ray binary with relativistic jets; and the highly energetic Westerlund 2 stellar cluster, which is located towards TeV gamma-ray emission and interesting arc- and jet-like features seen in Nanten 12 CO data. We have mapped both regions with the Mopra radio telescope, in 7 mm and 12 mm wavebands, looking for evidence of disrupted/dense gas caused by the interaction between high energy outflows and the ISM. Towards Westerlund 2, peaks in CS(J=1-0) emission indicate high density gas towards the middle of the arc and the endpoint of the jet; and radio recombination line emission is seen overlapping the coincident HII region RCW49. Towards Circinus X-1, 12 CO(J = 1-0) Nanten data reveals three molecular clouds that lie in the region of Cir X-1. Gas parameters for each cloud are presented here.
    Type of Medium: Online Resource
    ISSN: 2010-1945 , 2010-1945
    URL: Article
    DOI: 10.1142/S2010194514601987
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2014
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  • 6
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    Online Resource
    A NEW MECHANISM FOR PARTICLE ACCELERATION IN RELATIVISTIC JETS
    World Scientific Pub Co Pte Ltd ; 2008
    In:  International Journal of Modern Physics D Vol. 17, No. 10 ( 2008-09), p. 1839-1847
    Details
    In: International Journal of Modern Physics D, World Scientific Pub Co Pte Ltd, Vol. 17, No. 10 ( 2008-09), p. 1839-1847
    Abstract: We compare different acceleration mechanisms in application to relativistic jets and show that the converter mechanism, suggested recently, is the least sensitive to the geometry of the magnetic field in accelerators, and can routinely operate up to cosmic-ray energies close to the fundamental limit. The converter mechanism utilizes multiple conversions of charged particles into neutral ones (protons to neutrons and electrons/positrons to photons) and back by means of photon-induced reactions or inelastic nucleon-nucleon collisions. It works efficiently both in relativistic shocks and in shear flows under the conditions typical for active galactic nuclei, gamma-ray bursts, and microquasars, where it often outperforms the standard diffusive shock acceleration. The main advantages of the converter mechanism in such environments are that it greatly diminishes particle losses downstream and avoids the reduction in the energy gain factor, which normally takes place due to the highly collimated distribution of accelerated particles. We also discuss the properties of gamma-ray radiation, which accompanies acceleration of cosmic rays via the converter mechanism and can provide evidence for the latter. In particular, we point out that the opening angle of the radiation beam-pattern is different at different photon energies, which is relevant to the observability of gamma-ray sources as well as to their timing properties.
    Type of Medium: Online Resource
    ISSN: 0218-2718 , 1793-6594
    URL: Article
    DOI: 10.1142/S0218271808013479
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2008
    SSG: 16,12
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  • 7
    Online Resource
    Online Resource
    ON THE X-RAY/TEV CONNECTION IN GALACTIC JET SOURCES
    World Scientific Pub Co Pte Ltd ; 2008
    In:  International Journal of Modern Physics D Vol. 17, No. 10 ( 2008-09), p. 1883-1888
    Details
    In: International Journal of Modern Physics D, World Scientific Pub Co Pte Ltd, Vol. 17, No. 10 ( 2008-09), p. 1883-1888
    Abstract: There are three Galactic jet sources from which TeV emission has been detected: LS 5039, LS I +61 303 and Cygnus X-1. These three sources show power-law tails in X-rays and soft gamma-rays that could indicate a nonthermal origin of this radiation. In addition, all three sources apparently show correlated and complex behavior at X-ray and TeV energies. In some cases, this complex behavior is related to the orbital motion (e.g. LS 5039, LS I +61 303), and in some others it is related to some transient events occurring in the system (e.g. Cygnus X-1, and likely also LS I +61 303 and LS 5039). Based on modeling results or on energetic grounds, it seems difficult to explain the emission in the X-/soft gamma-ray and the TeV bands as coming from the same (i.e. one-zone) region. We also stress the importance of the pair creation phenomena in these systems, which harbor a massive and hot star, for the radio and the X-ray emission, as a secondary pair radiation component may be significant in these energy ranges. Finally, we point out that the presence of the star can indeed have a strong impact on both the nonthermal radiation production and the jet dynamics.
    Type of Medium: Online Resource
    ISSN: 0218-2718 , 1793-6594
    URL: Article
    DOI: 10.1142/S0218271808013522
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2008
    SSG: 16,12
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  • 8
    Online Resource
    Online Resource
    VERY HIGH ENERGY GAMMA RAYS FROM e ± PAIR HALOS
    World Scientific Pub Co Pte Ltd ; 2009
    In:  International Journal of Modern Physics D Vol. 18, No. 06 ( 2009-06), p. 911-927
    Details
    In: International Journal of Modern Physics D, World Scientific Pub Co Pte Ltd, Vol. 18, No. 06 ( 2009-06), p. 911-927
    Abstract: In this paper we study the formation of giant electron–positron pair halos around the powerful high energy extragalactic sources. We investigate the dependence of radiation of pair halos, in particular the spectral and angular distributions on the energy spectrum of the primary gamma rays, the redshift of the source, and the flux of the extragalactic background light.
    Type of Medium: Online Resource
    ISSN: 0218-2718 , 1793-6594
    URL: Article
    DOI: 10.1142/S0218271809014832
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2009
    SSG: 16,12
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