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A Study In Scarlet: Star Forming In The Centaur

Wednesday, April 16, 2014 10:52

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This area of the southern sky, in the constellation of Centaurus (The Centaur), is home to many bright nebulae, each associated with hot newborn stars that formed out of the clouds of hydrogen gas.

The intense radiation from the stellar newborns excites the remaining hydrogen around them, making the gas glow in the distinctive shade of red typical of star-forming regions. Another famous example of this phenomenon is the Lagoon Nebula, a vast cloud that glows in similar bright shades of scarlet.

This new image from the Wide Field Imager on the MPG/ESO 2.2-metre telescope at the La Silla Observatory in Chile reveals a cloud of hydrogen and newborn stars called Gum 41. In the middle of this little-known nebula, brilliant hot young stars emit energetic radiation that causes the surrounding hydrogen to glow with a characteristic red hue.

Credit: ESO

The nebula in this picture is located some 7300 light-years from Earth. Australian astronomer Colin Gum discovered it on photographs taken at the Mount Stromlo Observatory near Canberra, and included it in his catalogue of 84 emission nebulae, published in 1955. Gum 41 is actually one small part of a bigger structure called the Lambda Centauri Nebula, also known by the more exotic name of the Running Chicken Nebula. Gum died at a tragically early age in a skiing accident in Switzerland in 1960.

This pan video takes a close up look at a new image from the Wide Field Imager (WFI) on the MPG/ESO 2.2-metre telescope at the La Silla Observatory in Chile. It reveals a cloud of hydrogen and newborn stars called Gum 41 in the constellation of Centaurus (The Centaur). In the middle of this little-known nebula, brilliant hot young stars emit energetic radiation that causes the surrounding hydrogen to glow with a characteristic red hue.

Credit: ESO. Music: movetwo

In this picture of Gum 41, the clouds appear to be quite thick and bright, but this is actually misleading. If a hypothetical human space traveller could pass through this nebula, it is likely that they would not notice it as — even at close quarters — it would be toofaint for the human eye to see. This helps to explain why this large object had to wait until the mid-twentieth century to be discovered — its light is spread very thinly and the red glow cannot be well seen visually.

This chart shows the location of a cloud of hydrogen and newborn stars called Gum 41 in the large southern constellation of Centaurus (The Centaur). This map shows most of the stars visible to the unaided eye under good conditions and the location of the nebula itself is marked with a red circle. This object is part of the larger Lambda Centauri Nebula. Gum 41 is very faint and was only discovered photographically in the mid-20th century.

Credit: ESO, IAU and Sky & Telescope

This new portrait of Gum 41 — likely one of the best so far of this elusive object — has been created using data from the Wide Field Imager (WFI) on the MPG/ESO 2.2-metre telescope at the La Silla Observatory in Chile. It is a combination of images taken through blue, green, and red filters, along with an image using a special filter designed to pick out the red glow from hydrogen.

This zoom sequence starts with a broad view of the Milky Way and closes in on one of the more spectacular sections in the constellation of Centaurus (The Centaur). In the final sequence we see the star formation region known as Gum 41 in a new image from the MPG/ESO 2.2-metre telescope at the La Silla Observatory in Chile.

Credit: ESO/N. Risinger (skysurvey.org)/Hisayoshi Kato. Music: movetwo

Contacts and sources:

Richard Hook
ESO

Source:

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