A Chinese Dragon and a Knotted Galactic Embrace (Forwarded)
- From: Andrew Yee <ayee@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 31 Aug 2005 21:33:54 -0400
Gemini Observatory Hilo, Hawaii
Contact: Peter Michaud Desk: 808/974-2510
Friday, 26 August 2005
A Chinese Dragon and a Knotted Galactic Embrace
The Gemini Observatory released a pair of images today that capture the dynamics of two very different interactions in space. One is a cold, dark dust cloud that resembles an ethereal-looking Chinese dragon. The other shows a distant duo of galaxies locked in a knot-like embrace that could portend the long-term future of our own Milky Way galaxy.
The processes shown in these views occur on a tremendous range of size scales. NGC 6559 is a relatively small, nearby dust cloud in our Milky Way galaxy that measures about seven light-years across, while NGC 520 features two completely entwined galaxies that stretch across 150,000 light-years. While both images hint at how dynamic and active these objects can be, their evolution occurs on astronomical timescales. According to Ian Robson, Director of the UK's Astronomy Technology Center, "If we could see either of these objects as an extreme time-lapse movie made over millions of years, the galaxy pair would dance in a graceful orbital embrace that is likely similar to the fate between our Milky Way and the great Andromeda Galaxy, while the dusty cloud would probably resemble waving smoke from an extinguished candle."
Together, these Gemini images illustrate another point about the universe: it's dusty. The main features of NGC 6559 that lend this nebula its Chinese dragon appearance are dark clouds of backlit dust. The merging galaxies also show a prominent dust lane running diagonally across the image. In both cases this dust is visible because it blocks the light from behind it much like a cloud obscures sunlight here on Earth.
The two images were selected based on observations made during the first half of 2005 at each of the twin Gemini telescopes.
"I coordinated observations in Chile when the dragon-like images of NGC 6559 were obtained," said Gemini South Astronomer Rodrigo Carrasco. "I could tell this was going to make a fantastic color image with lots of details never resolved before in this cloud of dust. Other astronomers will appreciate this data now that it is in the Gemini Data Archive."
Gemini North on Mauna Kea captured the image of NGC 520, showing two interacting galaxies against a backdrop of dimmer much more distant galaxies. Gemini Astronomer Kathy Roth oversaw the observations and shared her reactions. "Watching images like these come off the telescope is always a thrill. It is very satisfying to have everything working perfectly and to be able to take advantage of the great conditions on Mauna Kea," she said. "This particular image not only makes a pretty picture but I expect will it be useful to astronomers who model interacting galaxies and how these interactions trigger star formation."
The pair of images were obtained using the Gemini Multi-Object Spectrograph (GMOS). It provides high-resolution imaging on both of the twin Gemini 8-meter telescopes. The observations are part of the ongoing Gemini Legacy Imaging program that shares striking views of the universe made possible with the new generation of large ground-based telescopes. Travis Rector of the University of Alaska combined the raw data to create the color images. Additional technical and background information and full-resolution image downloads are provided at
http://www.gemini.edu/index.php?option=content&task=view&id=150&Itemid=42&limit=1&limitstart=1 .
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