Hα survey of Abell 1689 (Balogh+, 2002)

Details Hα survey of Abell 1689 (Balogh+, 2002) Hα survey of Abell 1689 (Balogh+, 2002)

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ycat..73350010b&link_type=abstract

VizieR On-line Data Catalog: J/MNRAS/335/10. Originally published in: 2002MNRAS.335...10B

Computer Science

Clusters: Galaxy, Spectroscopy, Redshifts, Magnitudes

Scientific paper

We present results of an Hα survey in the rich cluster A 1689 at z=0.18, using the LDSS++ spectrograph on the Anglo-Australian Telescope (AAT). We obtained spectra covering redshifted Hα at z=0.16-0.22, for 522 galaxies brighter than I=22.5, covering a field of 8.7x8.7arcmin2 (~1.1x1.1h-1Mpc at z=0.18). We securely detect Hα emission in 46 of these galaxies; accounting for selection effects arising from sampling and cluster membership, we determine that 24+/-4 per cent of cluster members brighter than MR=-16.5+5logh are detected with Hα flux greater than 4h-2x1038erg/s. From a Hubble Space Telescope mosaic covering 7.5x10.0arcmin, we determine morphologies for 199 galaxies brighter than I=21, and find that ~20 per cent of the cluster members are of type Sa or later. More than 90 per cent of cluster spirals show Hα emission, compared with less than 10 per cent of E and S0 galaxies.
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