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From YubaNet.com Sci/Tech
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, AZ 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) --- 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 "cintracluster 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 telescopes 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. 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, AZ 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) --- 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 "cintracluster 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 telescopes 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. © Copyright YubaNet.com |
