Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344826k&link_type=abstract
American Astronomical Society, AAS Meeting #213, #448.26; Bulletin of the American Astronomical Society, Vol. 41, p.339
Astronomy and Astrophysics
Astronomy
Scientific paper
We present star formation rates (SFR), colors, morphologies, and locations of actively star forming galaxies in high redshift clusters in order to understand the impact of environment on star formation evolution in cluster galaxies. We use three, newly-identified, redshift one clusters selected from the IRAC dark field; the deepest ever mid-IR survey with accompanying, 14 band multi-wavelength data including deep HST imaging and deep wide-area Spitzer MIPS 24 micron imaging. Using our MIPS data, we find that the mass-normalized SFR for a composite of our three clusters is suggestive of a larger amount of star formation at higher redshifts when compared to similar measurements in clusters at lower redshifts. Roughly 60% of these star forming galaxies are on the red sequence while the rest are mainly bluer galaxies. Studying the morphologies we find that the majority of the MIPS detected member galaxies are spirals or starburst galaxies based on SED fitting, roughly 40% of them show irregular or interacting morphologies based on their rest-frame B-band light. Lastly the distribution of star forming galaxy distance from cluster center does not statistically significantly differ from the distribution of non-MIPS detected member galaxies, implying that they are not preferentially located either in the centers or on the outskirts of the clusters. We analyze these results in the context of the effect of environment on star formation at high redshift.
Ashby Matthew
Gorjian Varoujan
Hora Joe
Krick Jessica
Surace Jason
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