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Date and Time of the Query: 2019-04-21 T17:19:21 PDT
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For refcode 2000ApJ...537...73S:
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2000ApJ...537...73S One-Line Redshifts and Searches for High-Redshift Ly{alpha} Emission1 Daniel Stern, Andrew Bunker, and Hyron Spinrad Department of Astronomy, University of California at Berkeley, Berkeley, CA 94720 and Arjun Dey KPNO/NOAO, 950 North Cherry Avenue, P.O. Box 26732, Tucson, AZ 85726 Received 1999 June 30; accepted 2000 February 9 ABSTRACT We report the serendipitous discovery of two objects close in projection with fairly strong emission lines at long wavelength ({lambda} ~ 9190 A). One (A) seems not to be hosted by any galaxy brighter than V_555_ = 27.5, or I_814_ = 26.7 (Vega-based 3 {sigma} limits in 1.0" diameter apertures), while the other line is associated with a faint (I_814_ ~= 24.4) red galaxy (B) offset by 2.7" and 7 A spectrally. Both lines are broad (FWHM ~ 700 km s^-1^), are extended spatially, and have high equivalent widths [W_{lambda}_^Obs^ (A) > 1225 A, 95% confidence limit; W_{lambda}_^Obs^(B) ~ 150 A]. No secondary spectral features are detected for galaxy A. Blue continuum and the marginal detection of a second weak line in the spectrum of galaxy B is consistent with [O II] (the strong line) and Mg II (the weak line) at z = 1.466. By association, galaxy A is likely at z = 1.464, implying a rest-frame equivalent width of the [O II] emission line in excess of 600 E and a projected separation of 30 h_50_^-1^ kpc for the galaxy pair. Conventional wisdom states that isolated emission lines with rest-frame equivalent widths larger than ~200 A are almost exclusively Ly{alpha}. This moderate-redshift discovery therefore compromises recent claims of high-redshift Ly{alpha} emitters for which other criteria (i.e., line profile, associated continuum decrements) are not reported. We discuss observational tests to distinguish Ly{alpha} emitters at high redshift from foreground systems. Subject headings: early universe-galaxies: distances and redshifts - galaxies: evolution-galaxies: formation
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