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A Cluster or Filament of Galaxies at Redshift z = 2.5?

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Published 1998 December 9 • © 1999. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, , Citation Ana Campos et al 1999 ApJ 511 L1 DOI 10.1086/311824

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Author affiliations

1 Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation

2 Instituto de Matemáticas y Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 113bis, E-28006 Madrid, Spain

3 Department of Physics and Astronomy, State University of New York, Stony Brook, NY 11794-3800

4 Visiting Scholar, Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA 92093-0424

5 Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287-1504

6 University of Virginia and National Radio Astronomy Observatory

7 Steward Observatory, University of Arizona, Tucson, AZ 85721

8 Optical observations were obtained in part at the Multiple Mirror Telescope Observatory, a joint facility of the University of Arizona and the Smithsonian Institution

Dates

  1. Received 1998 February 17
  2. Accepted 1998 November 19
  3. Published
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1538-4357/511/1/L1

Abstract

We report the discovery of 56 new Lyα-emitting candidates (LECs) at redshift z ≈ 2.5 in a field of 8' × 14' around two previously known weak radio QSOs and a cosmic microwave background decrement (CMBD) that is plausibly due to the Sunyaev-Zeldovich effect. Broadband and medium-band imaging at the redshifted Lyα wavelength have allowed us to identify the LECs at the redshift of the QSOs. Three of the brightest LECs have been confirmed spectroscopically, with redshifts between z = 2.501 and z = 2.557; one of them is another QSO. Excluding the third QSO, the four spectroscopically confirmed objects form a 3' filament with a rest-frame velocity dispersion of 1000 km s-1 lying adjacent to the CMBD, and there is a significant concentration of LECs at the northwest end of the filament around the brightest QSO. If confirmed, a velocity dispersion ~1000 km s-1 on a proper scale of ~1 Mpc at redshift z = 2.5 would, in and of itself, constrain the cosmological model to low Ω.

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10.1086/311824