The ESO Slice Project (ESP) is a galaxy redshift survey we have recently completed as an ESO Key-Project. The ESP covers 23.3 square degrees in a region close to the South Galactic Pole. The survey is nearly complete (85%) to the limiting magnitude b(J) = 19.4 and consists of 3342 galaxies with reliable redshift determination. In this paper, the first in a series that will present the results of the ESP survey, we describe the main characteristics of the survey and briefly discuss the properties of the galaxy sample. From a preliminary spectral analysis of a large sub-sample of 2550 galaxies we find that the fraction of actively star-forming galaxies increases from a few percent for the brightest galaxies up to about 40% for the galaxies fainter than M = -16.5 +5 log h. The most outstanding feature in the ESP redshift distribution is a very significant peak at z similar or equal to 0.1. The detection of similar peaks, at the same distance, in other surveys in the same region of the sky, suggests the presence of a large bidimensional structure perpendicular to the line of sight. The minimum size of this structure would be of the order of 100 x 50 h(-1) Mpc, comparable with the size of the Great Wall.
The ESO slice project (ESP) galaxy redshift survey I. Description and first results / G. Vettolani, E. Zucca, G. Zamorani, A. Cappi, R. Merighi, M. Mignoli, G.M. Stirpe, H. MacGillivray, C. Collins, C. Balkowski, V. Cayatte, S. Maurogordato, D. Proust, G. Chincarini, L. Guzzo, D. Maccagni, R. Scaramella, A. Blanchard, M. Ramella. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 325:3(1997), pp. 954-960.
The ESO slice project (ESP) galaxy redshift survey I. Description and first results
L. Guzzo;
1997
Abstract
The ESO Slice Project (ESP) is a galaxy redshift survey we have recently completed as an ESO Key-Project. The ESP covers 23.3 square degrees in a region close to the South Galactic Pole. The survey is nearly complete (85%) to the limiting magnitude b(J) = 19.4 and consists of 3342 galaxies with reliable redshift determination. In this paper, the first in a series that will present the results of the ESP survey, we describe the main characteristics of the survey and briefly discuss the properties of the galaxy sample. From a preliminary spectral analysis of a large sub-sample of 2550 galaxies we find that the fraction of actively star-forming galaxies increases from a few percent for the brightest galaxies up to about 40% for the galaxies fainter than M = -16.5 +5 log h. The most outstanding feature in the ESP redshift distribution is a very significant peak at z similar or equal to 0.1. The detection of similar peaks, at the same distance, in other surveys in the same region of the sky, suggests the presence of a large bidimensional structure perpendicular to the line of sight. The minimum size of this structure would be of the order of 100 x 50 h(-1) Mpc, comparable with the size of the Great Wall.File | Dimensione | Formato | |
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