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Titolo:
Discovery of a transient absorption edge in the X-ray spectrum of GRB 990705
Autore:
Amati, L; Frontera, F; Vietri, M; int Zand, JJM; Soffitta, P; Costa, E; Del Sordo, S; Pian, E; Piro, L; Antonelli, LA; Dal Fiume, D; Feroci, M; Gandolfi, G; Guidorzi, C; Heise, J; Kuulkers, E; Masetti, N; Montanari, E; Nicastro, L; Orlandini, M; Palazzi, E;
Indirizzi:
CNR, Ist Tecnol & Studio Radiaz Extraterr, I-40129 Bologna, Italy CNR Bologna Italy I-40129 tudio Radiaz Extraterr, I-40129 Bologna, Italy Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy Univ Ferrara Ferrara Italy I-44100 partmento Fis, I-44100 Ferrara, Italy Terza Univ Roma, Dipartimento Fis, I-00146 Rome, Italy Terza Univ Roma Rome Italy I-00146 Dipartimento Fis, I-00146 Rome, Italy Space Res Org Netherlands, NL-3584 CA Utrecht, Netherlands Space Res Org Netherlands Utrecht Netherlands NL-3584 CA ht, Netherlands Ist Fis Cosm Applicaz Informat, I-00133 Rome, Italy Ist Fis Cosm Applicaz Informat Rome Italy I-00133 t, I-00133 Rome, Italy Osservatorio Astron Roma, I-00040 Rome, Italy Osservatorio Astron Roma Rome Italy I-00040 on Roma, I-00040 Rome, Italy
Titolo Testata:
SCIENCE
fascicolo: 5493, volume: 290, anno: 2000,
pagine: 953 - 955
SICI:
0036-8075(20001103)290:5493<953:DOATAE>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOELECTRIC ABSORPTION; ASTRONOMY SATELLITE; ON-BOARD; BEPPOSAX; ONBOARD; BURSTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Amati, L CNR, Ist Tecnol & Studio Radiaz Extraterr, Via Gobetti 101, I-40129 Bologna, Italy CNR Via Gobetti 101 Bologna Italy I-40129 I-40129 Bologna, Italy
Citazione:
L. Amati et al., "Discovery of a transient absorption edge in the X-ray spectrum of GRB 990705", SCIENCE, 290(5493), 2000, pp. 953-955

Abstract

We report the discovery of a transient equivalent hydrogen column density with an absorption edge at similar to3.8 kiloelectron volts in the spectrumof the prompt x-ray emission of gamma-ray burst (GRB) 990705. This featurecan be satisfactorily modeled with a photoelectric absorption by a medium Located at a redshift of similar to0.86 and with an iron abundance of similar to 75 times the solar one. The transient behavior is attributed to the strong ionization produced in the circumburst medium by the GRB photons. Thehigh iron abundance points to the existence of a burst environment enriched by a supernova along the Line of sight. The supernova explosion is estimated to have occurred about 10 years before the burst. Our results agree with models in which GRBs originate from the collapse of very massive stars and are preceded by a supernova event.

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Documento generato il 18/11/17 alle ore 03:46:03