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Absorption-line redshifts of galaxies in remote clusters obtained with a sky-subtraction spectrograph using an SIT television detector

Westphal, J. A. and Kristian, Jerome and Sandage, Allan (1975) Absorption-line redshifts of galaxies in remote clusters obtained with a sky-subtraction spectrograph using an SIT television detector. Astrophysical Journal, 197 . L95-L98. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20150218-102050266

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Abstract

A prism spectrograph with an associated SIT television camera, operating as a two-dimensional detector with digital readout, has been used at the 5-m Hale telescope. The system was tested for its ability to subtract the sky spectrum, and was found to produce difference spectra that are essentially photon noise limited. Redshifts of 14 galaxies in clusters with 0.01 ≤ z ≤ 0.4 were obtained, each with exposure times of 90 minutes or less. Nine of the redshifts are new. Redshifts for the remaining five agree with previous values to within the measuring errors. The speed and sky-subtraction capabilities of the instrument are sufficient to begin routine measurement of absorption-line redshifts for remote cluster galaxies in an effort to extend the Hubble diagram.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/ 10.1086/181786DOIArticle
http://adsabs.harvard.edu//abs/1975ApJ...197L..95WADSArticle
Additional Information:© 1975 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1975 January 24. This work was supported in part by the National Science Foundation, under grant GP-364S0X to the Carnegie Institution of Washington.
Funders:
Funding AgencyGrant Number
NSFGP-364S0X
Subject Keywords:galaxies, clusters of - redshifts
Record Number:CaltechAUTHORS:20150218-102050266
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150218-102050266
Official Citation: Absorption-line redshifts of galaxies in remote clusters obtained with a sky-subtraction spectrograph using an SIT television detector Westphal, J. A.; Kristian, J.; Sandage, A. Astrophysical Journal, vol. 197, May 1, 1975, pt. 2, p. L95-L98.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54940
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:18 Feb 2015 18:42
Last Modified:13 Feb 2019 18:06

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