Herschel finds a hole

The star forming region NGC 1999 has long puzzled astronomers because it includes a dark region where there is no emission detected in the optical or near infrared. It was thought that this indicated a region that was heavily obscured by dust. The radiation that would be emitted from this part of NGC1999 would thus be absorbed by dust which would re-readiate the energy at longer wavelengths which Herschel would be able to detected.

When Herschel astronomers observed NGC1999, though, they got a surprise…

The image shows a combination of Herschel and ground-based near infrared data on NGC1999. The important part is the region in the top left, where NGC1999 is coloured green. The hole, seen just to the right of NGC1999, is still there, dark even at Herschel wavelengths. This means there’s no dust there – it’s a hole in the nebula! The suspicion is that this is a hole blown in the material surrounding them by the stars forming in NGC1999. It’s long been known that this must occur if stars are to emerge from their nurseries, but this may be the first time they’ve been caught in the act.

For more information see the ESA discussion of these results.

Herschel Image of the Rosette Nebula

The promised new Herschel image release has arrived – apologies for being a little late with it as I was travelling most of yesterday and running the Herschel session at NAM2010 for the rest.

The latest image is of the Rosette Nebula, a region of high mass star formation in our own galaxy, about 500 light years away. The colours indicate dust temperature, ranging from 10K (red) to 50K (blue). The bright blobs are where high mass stars, 10 times as massive as our Sun or more, are forming. You can read more about this image at the ESA Herschel pages.

Much more will be coming out of Herschel at the start of May when the first scientific results conference is held at ESTEC in the Netherlands.