Other
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19312209s&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #122.09; Bulletin of the American Astronomical Society, Vol. 31, p.665
Other
1
Scientific paper
We report the discovery of two fairly strong serendipitous emission lines at long wavelength (λ 9185 Angstroms). One (A) seems not to be hosted by any galaxy brighter than IAB814 = 26, or VAB555=28, while the slightly offset (4\arcsec, 11 Angstroms) other (B) is associated with a faint (IAB814 = 24.1) red galaxy. Both lines are broad (FWHM=16 Angstroms, σ = 200 km s-1), substantially extended spatially ( 5\arcsec), and have extremely high equivalent widths (Wλ obs(A) 1600 Angstroms; Wλ obs(B) ≈> 100 Angstroms). Blue continuum and the marginal detection of a second weak line in the spectrum of component B solidifies the emission line identification as [O 2] (strong) and Mg 2 (weak) at z = 1.466. By association, component A is likely at z=1.463, implying a rest-frame equivalent width in excess of 600 Angstroms. Conventional wisdom states that emission lines with rest-frame equivalent widths larger than 100 Angstroms are exclusively Lyα . This moderate-redshift discovery therefore compromises recent claims of high-redshift Lyα emitters for which other criteria (i.e., line morphology, associated continuum decrements) are not reported. We also discuss the surface density of line emitters at long wavelength.
Bunker Andrew J.
Dey Arjun
Spinrad Hyron
Stern Daniel
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