Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.8905f&link_type=abstract
American Astronomical Society Meeting 203, #89.05; Bulletin of the American Astronomical Society, Vol. 35, p.1349
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present Hα -derived star-formation rates (SFRs) for the galaxy cluster CL J0023+0423B at z = 0.845. Our 3σ flux limits corresponds to a star-formation rate of 0.24 h100-2 M&sun; yr-1, and our minimum reliable Hα + [N II] equivalent width is > 10 Å, demonstrating that near-infrared narrow-band imaging can sample the star-forming galaxy population in distant clusters. Comparison with spectroscopy shows that the number of false detections is low (9 ± 6%) and that our Hα equivalent widths are correlated with spectroscopically determined [O II] equivalent widths. A magnitude-limited spectroscopic survey conducted over the same area missed 70% of the star-forming galaxies and 65% of the integrated star formation. Using Hubble Space Telescope Wide Field Planetary Camera 2 Archive images, we fit Sersic profiles to all galaxies with significant narrow-band equivalent widths and find that equivalent width decreases as the steepness of galaxy profile increases. We find no significant population of early type galaxies with ongoing star formation. The integrated SFR per cluster mass of CLJ0023+0423B is a factor of ten higher than that of the three z ˜ 0.2 clusters in the literature with available Hα observations. A larger sample of z ˜ 0.8 clusters spanning a range of cluster masses is needed to determine whether this variation is due to a difference in cluster mass or redshift.
RAF acknowledges support from the NASA Graduate Student Researchers Program through NASA Training Grant NGT5-50283 and from an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-0301328. DZ acknowledges support from the David and Lucile Packard Fellowship.
Finn Rose A.
McCarthy Donald W. Jr.
Zaritsky Dennis
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