Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5210k&link_type=abstract
American Astronomical Society, AAS Meeting #211, #52.10; Bulletin of the American Astronomical Society, Vol. 39, p.821
Astronomy and Astrophysics
Astronomy
Scientific paper
We have used GALEX to search for Lyman α blobs in two supercluster regions around z=0.83, where the emission line is near the peak sensitivity of the NUV grism. We chose two target fields containing multiple spectroscopically-confirmed clusters in this redshift range, after rejecting additional candidates for bright-star avoidance. The regions around CL 1054-0321 and CL0023+0423 were each observed in slitless-spectrum mode for 15 ksec, with accompanying direct images of 5 ksec. Using several search techniques, we have found no spatially resolved Lyman α emitters, despite the substantial gain in Tolman surface-brightness dimming compared to the blobs seen, often with many instances per field, at redshifts z=2.4-3.1. We thus directly confirm evolution in this population, which implies that they are produced uniquely by processes in the early history of galaxies and clusters. Image stacking gives mean detections of the brightest members in the richest constituent clusters, at short enough emitted wavelengths to constrain their typical history at lookback times near 7 Gyr.
This work was supported by NASA through grant NNG05GE51G.
Chapman Sandra C.
Keel William C.
White Raymond Edwin III
Windhorst Rogier A.
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