First Extra-galactic SiO Maser

This is a small part of the microwave spectrum of the maser star IRAS 04553-6825 in the Large Magellanic Cloud (LMC), a satellite galaxy to the Milky Way.

The region shown is centered at a frequency of about 86 GHz (wavelength about 3 mm), where SiO molecules in the atmosphere of this very large star produce a strong emission by the maser effect.

The abscissa shows the velocity, as indicated by the Doppler shift of the SiO emission; the ordinate shows the relative intensity. The line at the centre has a measured velocity of about 275 km/sec, very near the mean velocity of the LMC. There is therefore no doubt that this star is located in the LMC.

The observation was made with a new state-of-art millimetric receiver at the 15-metre Swedish-ESO Submillimetre Telescope (SEST) at the La Silla Observatory. The signal represents 26 hours of observation.

Credit:

ESO

About the Image

Id:eso9618b
Type:Chart
Release date:6 March 1996
Related releases:eso9618
Size:938 x 694 px

About the Object

Name:IRAS 04553-6825, Spectrum
Type:• Local Universe : Star
• X - Stars
Distance:170000 light years

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Swedish–ESO Submillimetre Telescope

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