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Title:
A photometric search for forbidden O II lines in MG II quasar absorption systems
Authors:
Nelson, Brant O.; Malkan, Matthew A.
Affiliation:
AA(California Univ., Los Angeles), AB(California Univ., Los Angeles)
Publication:
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 82, no. 2, p. 447-469. (ApJS Homepage)
Publication Date:
10/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Absorption Spectra, Astronomical Photometry, Line Spectra, Magnesium, Quasars, Astronomical Spectroscopy, Emission Spectra, Red Shift, Spectral Line Width, Star Formation
DOI:
10.1086/191724
Bibliographic Code:
1992ApJS...82..447N

Abstract

A search has been conducted in 22 quasar fields of forbidden O II emission from foreground objects through imaging at two different bandpasses. Excesses are found in all of the emission-line test objects and the ones without a line are not incorrectly detected. Out of 336 objects for which photometry was obtained 34 emission-line candidates with continuum minus line excesses above 2 sigma are found at a sensitivity for most fields on the order of 10 exp -16 ergs/sq cm s. Six are at a projected distance of less than 65 kpc, the distance within which 78 percent of the previously known z = z(abs) galaxies have been found. Spectroscopy of 13 field objects reveals three stars near zero redshift, seven galaxies, an extreme halo star, and a new quasar.

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