Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
BEPPOSAX DETECTION OF THE FE-K LINE IN THE NEARBY STARBURST GALAXY NGC-253
Autore:
PERSIC M; MARIANI S; CAPPI M; BASSANI L; DANESE L; DEAN AJ; DICOCCO G; FRANCESCHINI A; HUNT LK; MATTEUCCI F; PALAZZI E; PALUMBO GGC; REPHAELI Y; SALUCCI P; SPIZZICHINO A;
Indirizzi:
OSSERV ASTRON TRIESTE,VIA GB TIEPOLO 11 I-34131 TRIESTE ITALY UNIV BOLOGNA,DEPT ASTRON I-40126 BOLOGNA ITALY CNR,ITESRE I-40129 BOLOGNA ITALY ISAS,SISSA I-34013 TRIESTE ITALY UNIV SOUTHAMPTON,DEPT PHYS SOUTHAMPTON SO9 5NH HANTS ENGLAND UNIV PADUA,DEPT ASTRON I-35122 PADUA ITALY CNR,CAISMI I-50125 FLORENCE ITALY UNIV TRIESTE,DEPT ASTRON I-34131 TRIESTE ITALY TEL AVIV UNIV,SCH PHYS & ASTRON IL-69978 TEL AVIV ISRAEL
Titolo Testata:
Astronomy and astrophysics (Berlin)
fascicolo: 2, volume: 339, anno: 1998,
pagine: 33 - 36
SICI:
0004-6361(1998)339:2<33:BDOTFL>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY-EMISSION; SPIRAL GALAXIES; STAR-FORMATION; NGC-253; M82; NGC-3628; SPECTRA; GAS;
Keywords:
GALAXIES, INDIVIDUAL, NGC 253; GALAXIES, SPIRAL; GALAXIES, STARBURST;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
M. Persic et al., "BEPPOSAX DETECTION OF THE FE-K LINE IN THE NEARBY STARBURST GALAXY NGC-253", Astronomy and astrophysics (Berlin), 339(2), 1998, pp. 33-36

Abstract

We present BeppoSAX results on the near-by star burst galaxy NGC 253. Although extended, a large fraction of the X-ray emission comes from the nuclear region. Preliminary analysis of the LECS/MECS/PDS similar to 0.2-60 keV data from the central 4' region indicates that the continuum is well fitted by two thermal models: a ''soft'' component with kT similar to 0.9 keV, and a ''hard'' component with kT similar to 6 keV absorbed by a column density of similar to 1.2 x 10(22) cm(-2). For the first time in this object, the Fe K line at 6.7 keV is detected, with an equivalent width of similar to 300 eV. This detection, togetherwith the shape of the 2-60 keV continuum, implies that most of the hard X-ray emission is thermal in origin, and constrains the iron abundances of this component to be similar to 0.25 of solar. Other lines clearly detected are Si, S and Fe L/Ne, in agreement with previous ASCA results. We discuss our results in the context of the starburst-driven galactic superwind model.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/17 alle ore 17:33:53