jeudi 30 juillet 2015

Stormy seas in Sagittarius












ESA - Hubble Space Telescope logo.

30 July 2015

New Hubble view of the Lagoon Nebula

Some of the most breathtaking views in the Universe are created by nebulae — hot, glowing clouds of gas. This new NASA/ESA Hubble Space Telescope image shows the centre of the Lagoon Nebula, an object with a deceptively tranquil name. The region is filled with intense winds from hot stars, churning funnels of gas, and energetic star formation, all embedded within an intricate haze of gas and pitch-dark dust.

Nebulae are often named based on their key characteristics — particularly beautiful examples include the Ring Nebula (heic1310), the Horsehead Nebula (heic1307) and the Butterfly Nebula (heic0910). This new NASA/ESA Hubble Space Telescope image shows the centre of the Lagoon Nebula, otherwise known as Messier 8, in the constellation of Sagittarius (The Archer).

Wide-field view of the Lagoon Nebula (ground-based image)

The inspiration for this nebula’s name may not be immediately obvious — this is because the image captures only the very heart of the nebula. The Lagoon Nebula’s name becomes much clearer in a wider field view (opo0417i) when the broad, lagoon-shaped dust lane that crosses the glowing gas of the nebula can be made out.

Another clear difference between this new image and others is that this image combines both infrared and optical light rather than being purely optical(heic1015). Infrared light cuts through thick, obscuring patches of dust and gas, revealing the more intricate structures underneath and producing a completely different landscape [1].

Giant 'Twisters' in the Lagoon Nebula

However, even in visible light, the tranquil name remains misleading as the region is packed full of violent phenomena.

The bright star embedded in dark clouds at the centre of this image is known as Herschel 36. This star is responsible for sculpting the surrounding cloud, stripping away material and influencing its shape. Herschel 36 is the main source of ionising radiation [2] for this part of the Lagoon Nebula.

This central part of the Lagoon Nebula contains two main structures of gas and dust connected by wispy twisters, visible in the middle third of this image (opo9638). These features are quite similar to their namesakes on Earth — they are thought to be wrapped up into their funnel-like shapes by temperature differences between the hot surface and cold interior of the clouds. The nebula is also actively forming new stars, and energetic winds from these newborns may contribute to creating the twisters.

This image combines images taken using optical and infrared light gathered by Hubble’s Wide Field Planetary Camera 2.

video
Zooming in on the Lagoon Nebula

video
Panning across the Lagoon Nebula

Notes:

[1] Another particularly good example of this effect is shown in Hubble’s image of the Horsehead Nebula (heic1307).

[2] The ionising radiation here is ultraviolet light. This light knocks electrons loose from within atoms to create charged particles called ions.
Notes for editors

The Hubble Space Telescope is a project of international cooperation between ESA and NASA.

Links:

Images of Hubble: http://www.spacetelescope.org/images/archive/category/spacecraft/

Hubble websites: http://www.spacetelescope.org/ and http://hubblesite.org/

Images, Text, Credits: NASA, ESA, J. Trauger (Jet Propulson Laboratory)/Digitized Sky Survey 2 (Acknowledgement: Davide De Martin)/A. Caulet (ST-ECF)/Videos: NASA, ESA, J. Trauger (Jet Propulson Laboratory).

Best regards, Orbiter.ch

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