Étude de la cinématique et de la population stellaire du Centre Galactique

Abstract : The central parsec of the Galaxy has been observed using BEAR spectroimagery at high spectral resolution (up to 21 km/s) and medium spatial resolution (0.5"), in Bracket gamma (2.16 microns) and He I (2.06 microns), and high resolution imaging. These data were used to study the young, massive stars of the central parsec, and the structure and dynamics of ionized gas in Sgr A West. The stellar population has been separated into two groups: the IRS 16 complex of 6 LBVs, and at least 20 Wolf-Rayets. The IRS 13E complex has been identified as a cluster of at least 6 massive stars. All this is consistent with the young stars being born in a massive cluster a few tens of parsecs from the Galactic Centre. Providing a deep insight into the morphology of Sgr A West, our data allowed us to derive a kinematic model for the Northern Arm. Our results are in agreement with the idea that the Minispiral is made of ionisation fronts of wider neutral clouds, gravitationally stretched, coming from the CND.
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Astrophysics [astro-ph]. Université Pierre et Marie Curie - Paris VI, 2003. French


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Submitted on : Wednesday, November 9, 2005 - 3:24:04 PM
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Thibaut Paumard. Étude de la cinématique et de la population stellaire du Centre Galactique. Astrophysics [astro-ph]. Université Pierre et Marie Curie - Paris VI, 2003. French. <tel-00010941>

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