ACCUEIL

Consignes aux
auteurs et coordonnateurs
Nos règles d'éthique
Autres revues >>

Instrumentation, Mesure, Métrologie

1631-4670
Revue des Systèmes
 

 ARTICLE VOL 6/1-4 - 2006  - pp.37-42
TITLE
Mid-IR Probes of the ISM and Stellar Populations at the Galactic Center

RÉSUMÉ

Nous présentons nos dernières observations du centre Galactique dans le proche infrarouge et dans l'infrarouge moyen à l'aide des instruments de dernière génération de l'ESO.

ABSTRACT

We present the results of our last nearand mid-IR (NIR and MIR) observations of the central parsec of our Galaxy. These investigations benefit from the high quality of the ESO instrumentation. Spectroscopic observations with ISAAC at the ESO VLT enabled us to build the first L-band data-cube of the central region corrected for the foreground extinction. This led to the discovery of 3 Wolf-Rayet stars all of which show, for the first time, prominent HeII emission lines in their MIR spectra providing an indication of their early evolutionary phase. The datacube also enabled us to study the distribution of water ice and hydrocarbon absorption features in the central parsec. Also, recent ISAAC M-band spectroscopic observations of a number of bright sources in the central parsec are presented and the preliminary study of the CO gasand solid-phase distributions are discussed. NACO NIR photometry combined with VISIR Nand Q-band MIR photometry enabled us to construct Spectral Energy Distributions of over 60 compact sources. We identified four typical classes of sources, each of which show characteristic features that may enable us to understand the nature of previously unclassified objects in the region. Moreover, we performed the first interferometric investigations of individual sources at the Galactic Center with MIDI at the VLTI and we resolved for the first time the dust shell of the bright source IRS 3. Finally, the most important results of NIR NACO observations, allowed us to investigate the structure of the central stellar cluster, are also presented.

AUTEUR(S)
Jihane MOULTAKA, Thomas VIEHMANN, Rainer SCHÖDEL, Jorg-Uwe POTT, Andreas ECKART

MOTS-CLÉS
centre galactique, milieu interstellaire, populations stellaires.

KEYWORDS
galactic center, interstellar medium, stellar populations.

LANGUE DE L'ARTICLE
Anglais

 PRIX
• Abonné (hors accès direct) : 12.5 €
• Non abonné : 25.0 €
|
|
--> Tous les articles sont dans un format PDF protégé par tatouage 
   
ACCÉDER A L'ARTICLE COMPLET  (233 Ko)



Mot de passe oublié ?

ABONNEZ-VOUS !

CONTACTS
Comité de
rédaction
Conditions
générales de vente

 English version >> 
Lavoisier