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Title:
A Measurement of the Contamination in [O III] λ5007 Surveys of Intracluster Stars and the Surface Density of z=3.13 Lyα Galaxies
Authors:
Ciardullo, Robin; Feldmeier, John J.; Krelove, Kara; Jacoby, George H.; Gronwall, Caryl
Affiliation:
AA(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802; ), AB(Department of Astronomy, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106-1712 ), AC(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802; ), AD(Wisconsin-Indiana-Yale-NOAO Observatory, P.O. Box 26732, Tucson, AZ 85726; ), AE(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; )
Publication:
The Astrophysical Journal, Volume 566, Issue 2, pp. 784-793. (ApJ Homepage)
Publication Date:
02/2002
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, Galaxies: Clusters: General, Galaxies: Evolution, Galaxies: Formation, Galaxies: Interactions, ISM: Planetary Nebulae: General
DOI:
10.1086/338230
Bibliographic Code:
2002ApJ...566..784C

Abstract

We present two pieces of evidence supporting the hypothesis that the bright [O III] λ5007 sources found in Virgo's intracluster space are intracluster planetary nebulae rather than [O II] λ3727 galaxies at z~0.35 or Lyα sources at z~3.13. First, we confirm the nature of five ``overluminous'' [O III] sources that are postulated to lie in front of M87: by examining the composite spectrum of these objects, we show that the weaker [O III] line at λ4959 is definitely present at a strength ~1/3 that of [O III] λ5007. The ratio demonstrates that, at most, only one of the five objects is a background galaxy. We then estimate the surface density of background emission-line objects by conducting a wide-field (0.13 deg2) search at λ5019 for faint emission-line sources in a ``blank field'' located well away from any galaxy or cluster. We show that the density of blank-field emission-line sources is significantly lower than the density of sources detected between the galaxies of Virgo but in good agreement with the density of Lyα galaxies found by Hu, Cowie, & McMahon. The implication is that background galaxies account for only ~20% of the planetary nebula candidates in Virgo's intracluster fields.
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