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Astronomers Search For Orphan Stars Using Newly Upgraded Telescope

Date:
May 21, 2008
Source:
Case Western Reserve University
Summary:
Using new charge coupled device instrumentation, astronomers can now view the night sky wider and deeper than before.

Image of partial moon light up by Earthshine, showing extremely wide field of view of the camera.
Credit: Image courtesy of Case Western Reserve University

Using new charge coupled device (CCD) 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, Ariz., 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 CCD -- a larger and more sensitive version of the imaging technology found in everyday digital cameras -- will 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.

Originally discovered in the Virgo cluster three 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 degrees 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."

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 explained. 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.


Story Source:

The above story is based on materials provided by Case Western Reserve University. Note: Materials may be edited for content and length.


Cite This Page:

Case Western Reserve University. "Astronomers Search For Orphan Stars Using Newly Upgraded Telescope." ScienceDaily. ScienceDaily, 21 May 2008. <www.sciencedaily.com/releases/2008/05/080519155133.htm>.
Case Western Reserve University. (2008, May 21). Astronomers Search For Orphan Stars Using Newly Upgraded Telescope. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2008/05/080519155133.htm
Case Western Reserve University. "Astronomers Search For Orphan Stars Using Newly Upgraded Telescope." ScienceDaily. www.sciencedaily.com/releases/2008/05/080519155133.htm (accessed July 23, 2014).

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