Sharpless 29 is a stellar nursery churning about 5,500 light-years away. At its center sits a peach-and-azure nebula known as NGC 6559, the brightest feature in this spectacular region of the night sky, European Southern Observatory (ESO) officials said in a statement.
The OmegaCAM camera, an innovation in telescope technology that began scanning the sky in 2011, captured imagery of Sharpless 29 from atop ESO's VLT Survey Telescope in Cerro Paranal, Chile.,ESO released the images on Dec. 13.
OmegaCAM can observe wavelengths of light ranging from ultraviolet to infrared, and its ability to capture the spectral line H-alpha is particularly valuable, ESO officials said in the statement. That's because that wavelength is generated when hydrogen atoms lose energy, which is a common occurrence within nebula clouds like those of Sharpless 29. With this new observation technique, scientists can determine the movement of gas in stars and nebulas. "This sensitivity allows OmegaCAM to be able to efficiently study young stars accreting mass to form a circumstellar protoplanetary disc, or to characterise the physics of gigantic molecular clouds where new stars and planets form," said Giacomo Beccari, OmegaCAM Instrument Scientist.
At only a few light-years across, NGC 6559 is small in astronomical terms., The cloud of dust and gas is not as serene as it may appear, however: Stellar nurseries are places with intense activity.
The young stars in this image are no more than 2 million years old, and they erode and sculpt out material with the flows of material they create, called stellar winds, as well as blast out high-energy radiation. The peach-colored arch of the nebula is actually being produced by this activity, as the cavity of the nebula expands and material gathers along the outside. The nebula's color comes from the young stars' ultraviolet radiation bombarding the surrounding dust and gas, ESO officials said in a the image description.
The reds in this image are produced from emissions of hydrogen gas, and the blues are caused by the scattering of small dust particles and their reflection of the young stars' released energy, ESO officials said.