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Titolo:
Low deuterium abundance in the z(abs)=3.514 absorber towards APM 08279+5255
Autore:
Molaro, P; Bonifacio, P; Centurion, M; Vladilo, G;
Indirizzi:
Osservatorio Astron Trieste, I-34131 Trieste, Italy Osservatorio Astron Trieste Trieste Italy I-34131 I-34131 Trieste, Italy Inst Astrofis Canarias, E-38200 La Laguna, Tenerife, Spain Inst Astrofis Canarias La Laguna Tenerife Spain E-38200 , Tenerife, Spain
Titolo Testata:
ASTRONOMY AND ASTROPHYSICS
fascicolo: 1, volume: 349, anno: 1999,
pagine: L13 - L16
SICI:
0004-6361(199909)349:1<L13:LDAITZ>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
LITHIUM ABUNDANCE; COMPLEX;
Keywords:
cosmology : observations; cosmology : early Universe; galaxies : quasars : individual : APM 08279+5255; nuclear reactions, nucleosynthesis, abundances;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Molaro, P Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34131 Trieste,Italy Osservatorio Astron Trieste Via GB Tiepolo 11 Trieste Italy I-34131
Citazione:
P. Molaro et al., "Low deuterium abundance in the z(abs)=3.514 absorber towards APM 08279+5255", ASTRON ASTR, 349(1), 1999, pp. L13-L16

Abstract

A high-resolution, high signal-to-noise HIRES-Keck spectrum of APM 08279+5255 reveals a feature in the HI Ly alpha profile of the z(abs)=3.514 absorber at the expected position of the corresponding DI Ly alpha line. The absorber shows a relatively simple velocity structure, with a major component detected in several metallic lines including CII, CIV, Sill, SiIII and Si IV. Modeling of the hydrogen column density with the minimum number of components yields D/H approximate to 1.5 x 10(-5) However, a more complex structure for the hydrogen cloud with somewhat ad hoc components would allow a higher D/H. The system has a very low metallicity with [Si/H] approximate to -3.5 and [C/H] approximate to -4.0 and is therefore representative of essentially unprocessed material, with a deuterium abundance close to the primordial value. The present analysis favours the low D/H value of D/H =3.39 +/-0.25 x 10(-5) measured towards QSO 1009+2956 and QSO 1937-1009 (Burles & Tytler 1998a, 1998b) as the fiducial value of deuterium at high redshift.

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Documento generato il 24/09/20 alle ore 06:35:30