Hα Star Formation Rates of IRAC-selected Clusters in the Early Universe

Details Hα Star Formation Rates of IRAC-selected Clusters in the Early Universe Hα Star Formation Rates of IRAC-selected Clusters in the Early Universe

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21910706z&link_type=abstract

American Astronomical Society, AAS Meeting #219, #107.06

Astronomy and Astrophysics

Astronomy

Scientific paper

Galaxy clusters in the local universe consist of mostly massive, red galaxies with little or no recent star formation. To understand the stellar mass build-up of such massive galaxies requires a statistical sample of the progenitors of these galaxy clusters covering a redshift range when the star formation rates were near their peak. Using the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope, we obtained low-resolution near-IR grism spectroscopy (G141, 1.10 - 1.65 μm) to identify Hα emitters in a sample of 17 IRAC-selected, 1 ≤ z ≤ 1.5 galaxy clusters. We used Hα emission as our star formation indicator and were able to study the star formation properties of cluster galaxies in the core. The accompaniment of high-resolution WFC3 images (F160W) provided morphologies of many of the star forming galaxies and showed that a large fraction, ∼ 60%, of these galaxies are spiral in type. Also, we measured an increasing star formation rate density toward the cluster center for higher redshift clusters, z ≥ 1.37, possibly indicating a reversal of the relation at lower redshift. This is consistent with our MIPS star formation measurements of the same cluster sample.

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