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National Optical Astronomy Observatory News

For more information:

Douglas Isbell
NOAO Public
Information Officer
(520) 318-8214
disbell@noao.edu

Saswato Das
Lucent Technologies'
Bell Labs
Phone: (908) 582-4824
srdas@lucent.com

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This image from the National Science Foundation's 4-meter Blanco Telescope in Chile was used to detect and locate a cluster of 15 galaxies at a significant distance from Earth, using only the mass properties of the cluster, not its visible light.

The image was taken with an instrument called Big Throughput Camera, looking at a relatively barren portion of the sky in the direction of the constellation Pisces.

The galaxy cluster is enclosed by the circle in the lower right-hand corner of the image. The predicted astronomical redshift of the cluster and its mass properties match precisely with spectroscopic measurements made using the W. M. Keck telescopes on Mauna Kea, HI, at almost exactly the predicted redshift of z = 0.276. This number is equivalent to looking back in time to how the cluster appeared about three billion years ago.

Credit: Lucent Technologies' Bell Labs/NOAO/AURA/NSF

Press Release...


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This map represents the distribution of mass in a portion of the sky in the direction of the constellation Pisces that was imaged by the National Science Foundation's 4-meter Blanco Telescope in Chile.

The bright red spot in the lower right-hand corner identifies a newly discovered cluster of 15 galaxies at a significant distance from Earth, which was found using only the mass properties of the cluster, not its visible light.

The predicted astronomical redshift of the cluster and its mass properties match precisely with spectroscopic measurements made using the W. M. Keck telescopes on Mauna Kea, HI, at almost exactly the predicted redshift of z = 0.276. This number is equivalent to looking back in time to how the cluster appeared about three billion years ago.

Credit: Lucent Technologies' Bell Labs/NOAO/AURA/NSF

Press Release...


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NOAO is operated by the Association of Universities for Research in Astronomy (AURA), Inc. under cooperative agreement with the National Science Foundation. Last updated 14 August, 2001.

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