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New Star Survey Sheds Light On Milky Way's Evolution

This is a false-colour composite of nebulosity in the vicinity of the HII region, IC 1396B, in Cepheus. The image scale here is roughly 15 x 15 square arcminutes, with N to the left and E down. Credits: Nick Wright, University College London.

London, UK (SPX) Sep 21, 2005
The first survey of the entire northern Milky Way for forty years is shedding fresh light on the life-cycle of stars in our astronomical backyard.

The survey, which publishes its initial findings today in the Monthly Notices of the Royal Astronomical Society, uses the latest high resolution instruments to seek out stars and nebulae in the early and late phases of their evolution, stages that are rarely observed because they are so short-lived. Lead researcher Professor Janet Drew , of the Department of Physics at Imperial College London, says:

"These are crucial evolutionary stages in the growth and death of planetary systems, and many of the major unsolved problems in stellar evolution are to do with the fact that we have had relatively few examples to work with.

"The last time the northern Milky Way was searched in a concerted way was the 1960s, using much smaller telescopes and now obsolete detection methods. This new survey has the potential to greatly expand our understanding of how our own Solar System came to be and what it will become."

The UK, Dutch and Spanish team is using the 2.5 metre Isaac Newton Telescope (INT) to detect stars and bodies of gas that emit strongly at the wavelength of red light called H alpha. H alpha is emitted by excited atoms of hydrogen, allowing scientists to pick out both young, potential planet-building systems and old objects that will soon become compact white dwarfs or supernova explosions.

These are particularly important in understanding the evolution of galaxies, since youthful stars help to shape the growth of planetary systems while those in old age recycle energy and chemically enriched matter back into the galactic environment as they collapse.

The new survey reaches beyond the sun's orbit around the centre of the Milky Way to a radius of 30 kiloparsecs (kpc) around 90,000 light years. Currently almost nothing is known about the star populations beyond a distance of about 15 kpc. Professor Drew adds:

"At the moment, very little is known about the far reaches of the Milky Way's disc there's still uncertainty in its spiral arm structure, and we don't really know where the stars run out. Recent technical developments, which have boosted both the efficiency of large-scale astronomical surveys and their quality in a major way, mean we now have the opportunity to survey the galaxy we live in at hugely improved sensitivity."

The team expects to complete its observations in late 2006 with a total of around 80 million objects catalogued. Current images can be viewed here.

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The Galactic Centre Region
Paris, France (SPX) Sep 15, 2005
In an article to be published in the Astrophysical Journal, Belanger et al. present the results of a detailed analysis of approximately 1900 hours of observations of the galactic centre, obtained with Integral since the launch of the spacecraft in October 2002.

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