The centre of the Milky Way

The centre of our Milky Way galaxy is located in the southern constellation Sagittarius (The Archer) and is "only" 26,000 light-years away. On high-resolution images, it is possible to discern thousands of individual stars within the central, one light-year wide region.

Using the motions of these stars to probe the gravitational field, observations over the last decade have shown that a mass of about 3 million times that of the Sun is concentrated within a radius of only 10 light-days of the compact radio and X-ray source SgrA* (Sagittarius A) at the centre of the star cluster. This means that SgrA* is the most likely counterpart of the black hole believed to exist at the centre of our Galaxy.

This image was obtained in mid-2002 with the NACO instrument at the 8.2-m VLT Yepun telescope. It combines frames in three infrared wavebands between 1.6 and 3.5 µm. The compact objects are stars and their colours indicate their temperature (blue ="hot", red ="cool"). There is also diffuse infrared emission from interstellar dust between the stars.

A newer image of that region has been published in 2008; see image eso0846a.

Crediti:

ESO

A proposito dell'immagine

Identificazione:eso0226a
Tipo:Osservazione
Data di pubblicazione:16 Ottobre 2002
Notizie relative:eso0226
Dimensione:2598 x 2362 px

A proposito delll'oggetto

Nome:Milky Way Galactic Centre
Tipo:Milky Way : Galaxy
Distanza:25000 Anni luce
Constellation:Sagittarius
Categoria:Galaxies

Formati delle immagini

JPEG grande
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Sfondi

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2048x1536
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Coordinate

Position (RA):17 45 40.04
Position (Dec):-29° 0' 26.95"
Field of view:0.30 x 0.28 arcminutes
Orientazione:Il Nord è a 0.3° a destra della verticale

Colori e filtri

BandaLunghezza d'ondaTelescopio
Infrarosso
K
2.18 μmVery Large Telescope
NACO