Machine Measurements of the Objective Prism Spectra of Faint Galaxies - Part Two - Interactive Redshift Measurements

Details Machine Measurements of the Objective Prism Spectra of Faint Galaxies - Part Two - Interactive Redshift Measurements Machine Measurements of the Objective Prism Spectra of Faint Galaxies - Part Two - Interactive Redshift Measurements

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..251b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 219, NO.2/MAR15, P. 251, 1986

Astronomy and Astrophysics

Astronomy

15

Scientific paper

A sample of spectra from a UK Schmidt Telescope objective-prism plate covering a region of 4.7° × 5.2× of sky centred at 21h 32m - 60° 00' (1950) in the Indus supercluster has been extracted by means of the COSMOS measuring machine using the method described in Paper I. The objective-prism spectra were separated by eye into stellar and galaxian type. Galaxy spectra were subsequently passed through an interactive redshift-determining procedure, which resulted in 2294 redshifts. This galaxy sample was checked by comparison with a sample obtained from the direct plate of the field. The results indicated that the star-galaxy separation using spectra from the prism plate is reliable to about Mj °18.5, but that the redshifts can only be obtained reliably by the interactive procedure to Mj 17.8. The galaxies brighter than this limit provided 496 redshifts, from which it was deduced that an rms accuracy of ˜2000km s-1 possible from the method to the above depth. The data are used to examine the existence and structure of the Indus supercluster in this field. The results indicate that the indus supercluster is indeed present, and extends at least 4° to the south and west of the rich clusters 2151-5805 and 2143-5732, and a 'bridge' connecting these rich clusters is revealed. No connection between the Indus supercluster and the foreground cluster 2131-6215 is found.

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