First Herschel SPIRE images outPosted: July 10, 2009
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A couple of weeks ago ESA released the first images from the PACS instrument onboard the Herschel Space Telescope. This morning it followed them up with the equally impressive first light images from the longer wavelength, UK led, SPIRE instrument.
The images above show two spiral galaxies, M66 and M74. The wavelengths at which SPIRE operates means that it sees the glow from cold clouds of dust which occur in regions where lots of star formation is occurring (this is why the spiral arms show up so clearly). Even more interesting for me though are all the blobs that can be seen in the background to the images – each one is actually a much more distant galaxy, too far away from us to be seen as anything other than a point source. As the speed of light is always the same, looking at these galaxies is like looking back in time; the light Herschel has detected was emitted many, many years ago and has been travelling towards us ever since. This means that studying these objects can tell us about what things were like in the Universe when it was young.
This picture compares two images of the same nearby spiral galaxy, M74, one taken with the Spitzer Space Telescope and the other taken with the SPIRE instrument. It illustrates how much more detail Hershchel can see with its larger (3.5 m) mirror and more sensitive detectors.
More images from these first observations can be found here and see here for the UK Herschel Outreach Site which gives a good overview of the mission, including a fun counter showing how far away the satellite currently is along with how fast its now moving.
The quality of these images is amazing given that they were taken before the telescope’s been properly set up. I think it’s like buying a new TV, turning it on for the first time, and being able to start watching it after only half tuning it in. It’s all very exciting!