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Title:
Zpectrometer: an Ultra-wideband Spectrometer for Redshift Searches with the Green Bank Telescope
Authors:
Baker, A. J.; Harris, A. I.; Jewell, P. R.; Rauch, K. P.; Zonak, S. G.; O'Neil, K.; Shelton, A. L.; Norrod, R. D.; Ray, J.; Watts, G.
Affiliation:
AA(National Radio Astronomy Observatory/University of Maryland), AB(Maryland), AC(NRAO), AD(Maryland), AE(Maryland), AF(NRAO), AG(NRAO), AH(NRAO), AI(NRAO), AJ(NRAO)
Publication:
American Astronomical Society Meeting 207, #88.01; Bulletin of the American Astronomical Society, Vol. 37, p.1315
Publication Date:
12/2005
Origin:
AAS
Bibliographic Code:
2005AAS...207.8801B

Abstract

To understand the cosmic histories of star formation and accretion, observers must determine the redshifts of distant galaxies whose central starbursts and/or active nuclei are heavily obscured by dust. Direct spectroscopy of molecular emission lines is the ideal way to meet this challenge, but a suitable instrument must have large instantaneous bandwidth to achieve broad redshift coverage. We describe a new, ultra-wideband "Zpectrometer" now under construction for the Green Bank Telescope that satisfies this need. Using a novel analog lag cross-correlator spectrometer technology in a correlation radiometer architecture, the Zpectrometer will produce stable spectra over the entire 26-40 GHz range of the GBT's Ka-band receiver. The Zpectrometer will enable blind searches for CO(1-0) emission in the redshift range where the cosmic star formation rate density peaks, higher-J CO transitions at earlier epochs, and rotational lines from other molecules at a variety of redshifts.

This project is funded by a National Science Foundation ATI Program grant to the University of Maryland and by contributions from the National Radio Astronomy Observatory.

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