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Titolo:
Stellar populations in NGC 5128 with the VLT: Evidence for recent star formation
Autore:
Rejkuba, M; Minniti, D; Silva, DR; Bedding, TR;
Indirizzi:
European So Observ, D-85748 Garching, Germany European So Observ Garching Germany D-85748 v, D-85748 Garching, Germany Pontificia Univ Catolica Chile, Dept Astron, Santiago 22, Chile PontificiaUniv Catolica Chile Santiago Chile 22 ron, Santiago 22, Chile Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia Univ Sydney Sydney NSWAustralia 2006 h Phys, Sydney, NSW 2006, Australia
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 379, anno: 2001,
pagine: 781 - 797
SICI:
1432-0746(200112)379:3<781:SPIN5W>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
COLOR-MAGNITUDE DIAGRAMS; HUBBLE-SPACE-TELESCOPE; NGC-5128 CENTAURUS-A; RED GIANT BRANCH; GLOBULAR-CLUSTERS; METALLICITY DISTRIBUTION; BOLOMETRIC CORRECTIONS; STANDARD STARS; DWARF GALAXIES; LOCAL GROUP;
Keywords:
galaxies : elliptical and lenticular, cD; galaxies : stellar content; stars : fundamental parameters; galaxies : individual : NGC 5128;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
88
Recensione:
Indirizzi per estratti:
Indirizzo: Rejkuba, M European So Observ, Karl Schwarzschild Str 2, D-85748 Garching,Germany European So Observ Karl Schwarzschild Str 2 Garching Germany D-85748
Citazione:
M. Rejkuba et al., "Stellar populations in NGC 5128 with the VLT: Evidence for recent star formation", ASTRON ASTR, 379(3), 2001, pp. 781-797

Abstract

We resolve stars of the nearest giant elliptical galaxy NGC 5128 using VLTwith FORS1 and ISAAC. We construct deep U, V and K-s color-magnitude and color-color diagrams in two different halo fields (in the halo and in the north-eastern diffuse shell). In the outer, shell field, at similar to 14 kpcfrom the center of the galaxy, there is a significant recent star formation with stars as young as 10 Myr, approximately aligned with the prominent radio and X-ray jet from the nucleus of the host AGN. Ionized gas filaments are evident in ultraviolet images near the area where neutral Hi and CO molecular gas was previously observed. The underlying stellar population of the halo of the giant elliptical is predominantly old with a very broad metallicity distribution. The presence of an extended giant branch reaching M-bol = -5 mag suggests the existence of a significant intermediate-age AGB population in the halo of this galaxy.

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Documento generato il 19/09/20 alle ore 20:32:30