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New camera sees first light

Astronomers search for orphan stars using a newly upgraded telescope.
Provided by Case Western Reserve University, Cleveland, Ohio
CCD
This image shows the new CCD sitting in the cryogenic dewar.
Case Western Reserve University
May 20, 2008
Using new instrumentation, Case Western Reserve University astronomers can now view the night sky wider and deeper than before.

While the vast reaches of intergalactic space may appear dark and empty, a new camera installed on the university's Burrell Schmidt telescope at Kitt Peak National Observatory in Tucson, will bring into clear view the faint sea of orphan stars strewn throughout the nearby Virgo cluster of galaxies.

The design and installation of the new camera system was led by Case Western Reserve astronomer Paul Harding, who also serves as the observatory manager. A new charge coupled device (CCD)&#8212a larger and more sensitive version of the imaging technology found in everyday digital cameras&#8212will enable the astronomers to determine the ages of these stars and unravel the secrets of their origins.

This faint orphan starlight, dubbed "intracluster light," is formed when galaxies collide with one another inside titanic clusters of galaxies. During these collisions, stars are ripped away from their parent galaxies and strewn throughout the cluster by the gravitational forces at work.
Moon
This image of the partial Moon lit up by Earthshine shows the extremely wide field of view of the camera.
Case Western Reserve University
Originally discovered in the Virgo cluster 3 years ago by Case astronomer Chris Mihos and his collaborators, this intracluster light holds the key to understanding how galaxy clusters form and evolve.

The primary reason for upgrading the telescope's camera is to determine the color of these stars, according to Mihos and Harding. "Typically younger stars are bluer," Harding says, "so if we can measure the color of the intracluster light, we can learn about its age."

Younger ages for the stars would suggest that the Virgo cluster formed relatively recently, over the past few billion years. But because the stars are very faint in the blue, to measure the stellar colors the existing camera needed to be upgraded to be image a wider portion of the sky with even greater sensitivity.

The telescope's upgraded camera images an area of the sky 1.5° on a side — twice as big as the old camera, and enough to fit nine full Moons in the field of view. "By imaging twice as much sky, we can collect twice as much light at once," Mihos says, "and that lets us detect this faint starlight even in the blue where it is extremely faint."
Virgo
This is an image of the Virgo cluster, from a mosaic of images from the new camera. The total field of view here is 3.2° on a side.
Case Western Reserve University
Harding likens the new CCD to a camera that has been retrofitted to increase its film size from 35 mm to a large format film size of several inches. "It's the same camera but bigger film," Harding explains. The CCD itself, a thin wafer of silicon measuring three inches on a side, was fabricated by the Imaging Technology Laboratory at the University of Arizona and cost approximately $100,000.

Harding worked with astronomy graduate student Craig Rudick and undergraduate student Colin Slater to install the CCD onto Case's wide-field telescope at Kitt Peak. Funding for the new camera came from a combination of research grants from the National Science Foundation and Research Corporation to Mihos and fellow Case astronomer Heather Morrison, as well as from departmental endowment funds.
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