501 research outputs found
The Observed Galactic Annihilation Line: Possible Signature of Accreting Small Mass Black Holes in the Galactic Center
No full textVarious balloon and satellite observatories have revealed what appears to be an extended source of 0.511 MeV annihilation radiation with flux of approx. 10(exp -3) photons/sq cm/s centered on the Galactic Center. Positrons from radioactive products of stellar explosions can account for a significant fraction of the emission. We discuss an additional source for this emission: namely e(+)e(-) pairs produced when X-rays generated from the approx. 2.6 x 10(exp 6) solar mass Galactic Center Black Hole interact with approx. 10 MeV temperature blackbody emission from 10(exp 17) g black holes within 10(exp 14-l5) cm of the center. The number of such Small Mass Black Holes (SMMBHs) can account for the production of the 10(exp 42) e(+)/s that produces the observed annihilation in the inner Galaxy when transport effects are taken into account. We consider the possibility for confirming the presence of these SMMBHs in the Galactic Center region with future generations of gamma-ray instruments if a blackbody like emission of approx. 10 MeV temperature would be detected by them. Small Mass Black Hole can be a potential candidate for dark (invisible) matter ha
Birot (P.) Dresch (J.) - La Méditerranée et le Moyen-Orient. Tome I, La Méditerranée occidentale.
No full textChardonnet Jean. Birot (P.) Dresch (J.) - La Méditerranée et le Moyen-Orient. Tome I, La Méditerranée occidentale.. In: Revue économique, volume 6, n°1, 1955. pp. 143-144
Birot (P.) Dresch (J.) - La Méditerranée et le Moyen-Orient. Tome I, La Méditerranée occidentale.
No full textChardonnet Jean. Birot (P.) Dresch (J.) - La Méditerranée et le Moyen-Orient. Tome I, La Méditerranée occidentale.. In: Revue économique, volume 6, n°1, 1955. pp. 143-144
GRB 980425, SN1998bw and the EMBH model
No full textThe EMBH model, previously developed using GRB 991216 as a prototype, is here applied to GRB 980425. We fit the luminosity observed in the 40-700 keV, 2-26 keV and 2-10 keV bands by the BeppoSAX satellite. In addition we present a novel scenario in which the supernova SN1998bw is the outcome of an "induced gravitational collapse" triggered by GRB 980425, in agreement with the GRB-Supernova Time Sequence (GSTS) paradigm [Ruffini, R., Bianco, C.L., Chardonnet, P., Fraschetti, F., Xue, S.-S. On a possible GRB-supernova time sequence. Astrophys. J. 555, L117-L120, 2001c]. A further outcome of this astrophysically exceptional sequence of events is the formation of a young neutron star generated by the SN1998bw event. A coordinated observational activity is recommended to further enlighten the underlying scenario of this most unique astrophysical system. © 2004 COSPAR. Published by Elsevier Ltd. All rights reserved
Faucher (Daniel) - Le Paysan et la machine Fromont (P.) et divers - La Modernisation de l'agriculture Malenbaum (Wilfred) - The World Wheat Economy (1885-1939).
No full textChardonnet Jean. Faucher (Daniel) - Le Paysan et la machine Fromont (P.) et divers - La Modernisation de l'agriculture Malenbaum (Wilfred) - The World Wheat Economy (1885-1939).. In: Revue économique, volume 6, n°3, 1955. pp. 512-513
Chardonnet (J.), Métropoles économiques, 1959
No full textClozier René. Chardonnet (J.), Métropoles économiques, 1959. In: L'information géographique, volume 24, n°1, 1960. p. 39
Faucher (Daniel) - Le Paysan et la machine Fromont (P.) et divers - La Modernisation de l'agriculture Malenbaum (Wilfred) - The World Wheat Economy (1885-1939).
No full textChardonnet Jean. Faucher (Daniel) - Le Paysan et la machine Fromont (P.) et divers - La Modernisation de l'agriculture Malenbaum (Wilfred) - The World Wheat Economy (1885-1939).. In: Revue économique, volume 6, n°3, 1955. pp. 512-513
Djourabtchi (Hassan) - La structure économique de l'Iran.
No full textChardonnet Jean. Djourabtchi (Hassan) - La structure économique de l'Iran.. In: Revue économique, volume 8, n°3, 1957. p. 520
Dudley (Stamp L.) - Our Undeveloped World.
No full textChardonnet Jean. Dudley (Stamp L.) - Our Undeveloped World.. In: Revue économique, volume 5, n°4, 1954. p. 671
Algérie 1954 - Encyclopédie Mensuelle d'Outre-Mer.
No full textChardonnet Jean. Algérie 1954 - Encyclopédie Mensuelle d'Outre-Mer.. In: Revue économique, volume 8, n°1, 1957. p. 163
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