{"id":7335,"date":"2014-04-16T06:00:59","date_gmt":"2014-04-16T06:00:59","guid":{"rendered":"http:\/\/hobbyspace.com\/Blog\/?p=7335"},"modified":"2014-04-17T19:11:29","modified_gmt":"2014-04-17T19:11:29","slug":"eso-a-study-in-scarlet","status":"publish","type":"post","link":"https:\/\/hobbyspace.com\/Blog\/?p=7335","title":{"rendered":"ESO: A study in scarlet"},"content":{"rendered":"

This week’s European Southern Observatory<\/a> (ESO) scientific highlight:<\/p>\n

A Study in Scarlet<\/strong><\/a><\/p>\n

This new image from ESO\u2019s La Silla Observatory in Chile reveals a cloud of hydrogen called Gum 41. In the middle of this little-known nebula, brilliant hot young stars are giving off energetic radiation that causes the surrounding hydrogen to glow with a characteristic red hue.<\/p>\n

\"eso1413a\"<\/a><\/p>\n

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 (eso0936<\/a>), a vast cloud that glows in similar bright shades of scarlet.<\/p>\n

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\u00a0catalogue of 84 emission nebulae<\/a>, 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 (another part of which was the topic of\u00a0eso1135<\/a>). Gum died at a tragically early age in a skiing accident in Switzerland in 1960.<\/p>\n

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 \u2014 even at close quarters \u2014 it would be too faint 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 \u2014 its light is spread very thinly and the red glow cannot be well seen visually.<\/p>\n