Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19710706p&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #107.06; Bulletin of the American Astronomical Society, Vol. 32, p.1581
Astronomy and Astrophysics
Astronomy
4
Scientific paper
We detect an overdensity of emission-line objects concentrated in a 40x 10 arcmin2 region coincident with the z=2.38 cluster of galaxies toward J2142.4-4420 (also known as the Francis cluster). The Francis cluster consists of a region of a neutral hydrogen extending at least 8' and three strong Lyα emitters. The new emission-line detections suggest that the cluster is embedded in a much larger structure which may correspond to a filament or cross-section of a great wall at least 40x 10 Mpc in transverse extent. The objects were detected in a narrowband filter of bandpass 55 Å using the Mosaic camera on the CTIO 4m telescope. The strong emission at 4110 Å (> 100 Å equivalent width) argue for the objects being Lyα emitters at z=2.38, and thus physically associated with the cluster. The volume probed by the narrowband filter and the [OII] equivalent-widths required argue strongly against a significant contamination of our sample by interlopers at z=0.103. This study was funded by a NASA grant NRA--98--03--UVG--011. NOAO is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.
Francis Paul
Palunas Povilas
Woodgate Bruce
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