The Giant Flare of 1998 August 27 from SGR 1900+14. I. An Interpretive Study of BeppoSAX and Ulysses Observations (Articolo in rivista)

Type
Label
  • The Giant Flare of 1998 August 27 from SGR 1900+14. I. An Interpretive Study of BeppoSAX and Ulysses Observations (Articolo in rivista) (literal)
Anno
  • 2001-01-01T00:00:00+01:00 (literal)
Alternative label
  • Feroci M.1, Hurley K. 2, Duncan R. C. 3; Thompson C. 4 (2001)
    The Giant Flare of 1998 August 27 from SGR 1900+14. I. An Interpretive Study of BeppoSAX and Ulysses Observations
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Feroci M.1, Hurley K. 2, Duncan R. C. 3; Thompson C. 4 (literal)
Pagina inizio
  • 1021 (literal)
Pagina fine
  • 1038 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • La rivista Astrophysical Journal nel 2001 aveva un Impact Factor IF=5,921. L'articolo ha 27 citazioni. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 549 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • L'articolo riporta uno studio interpretativo delle osservazioni di un fenomeno eccezionale, il flare gigante del 27 Agosto 1998 dalla sorgente SGR 1900+14, ottenute con il satellite italiano BeppoSAX e la sonda interplanetaria ESA/USA Ulysses. I dati vengono confrontati in ogni possibile dettaglio con la teoria del Magnetar, dimostrando che le sue predizioni sono perfettamente compatibili con le osservazioni. L'articolo, risultato di un lavoro in collaborazione con R. Duncan (Univ. Texas, Austin), C. Thompson (ora CITA, Toronto) e K. Hurley (Univ. California, Berkeley), ha fornito quindi un notevole supporto alla teoria sull'esistenza dei Magnetar nell'Universo (per la quale Duncan e Thomposn sono poi stati premiati con il 2003 Bruno Rossi Prize): stelle di neutroni isolate che ospitano - e sono \"alimentate\" - i campi magnetici piu' intensi mai osservati in natura (circa 10^15 Gauss). (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1. CNR-IASF-RM, 2. University of California 3. University of Texas 4. University of Carolina (literal)
Titolo
  • The Giant Flare of 1998 August 27 from SGR 1900+14. I. An Interpretive Study of BeppoSAX and Ulysses Observations (literal)
Abstract
  • The giant flare of 1998 August 27 from SGR 1900+14 was extraordinary in many ways: it was the most intense flux of gamma rays ever detected from a source outside our solar system; it was longer than any previously detected burst from a soft gamma repeater (SGR) in our Galaxy by more than an order of magnitude; and it showed a remarkable four-peaked, periodic pattern in hard X-rays with the same rotation period that was found modulating soft X-rays from the star in quiescence. The event was detected by several gamma-ray experiments in space, including the Ulysses gamma-ray burst detector and the BeppoSAX Gamma-Ray Burst Monitor. These instruments operate in different energy ranges, and comparisons of their measurements reveal complex patterns of spectral evolution as the intensity varies. In this paper, we present a joint analysis of the BeppoSAX and Ulysses data and discuss some implications of these results for the SGRs. We also present newly analyzed Venera/SIGNE and ISEE-3 data on the 1979 March 5 giant flare from an SGR in the Large Magellanic Cloud (SGR 0526-66) and compare them with the August 27 event. Our results are consistent with the hypothesis that giant flares are due to catastrophic magnetic instabilities in highly magnetized neutron stars, or ``magnetars.'' In particular, observations indicate that the initial hard spike involved a relativistic outflow of pairs and hard gamma rays, plausibly triggered by a large propagating fracture in the crust of a neutron star with a field exceeding 1014 G. Later stages in the light curve are accurately fitted by a model for emission from the envelope of a magnetically confined pair-photon fireball, anchored to the surface of the rotating star, which contracts as it emits X-rays and then evaporates completely in a finite time. The complex four-peaked shape of the light curve likely provides the most direct evidence known for a multipolar geometry in the magnetic field of a neutron star. (literal)
Autore CNR
Insieme di parole chiave

Incoming links:


Autore CNR di
Prodotto
Insieme di parole chiave di
data.CNR.it