H$\alpha$ Star Formation Rates of $z$ > 1 Galaxy Clusters in the IRAC Shallow Cluster Survey
| Autor: | Zeimann, Gregory, Stanford, S. A., Brodwin, Mark, Gonzalez, Anthony H., Mancone, Conor, Snyder, Gregory F., Stern, Daniel, Eisenhardt, Peter, Dey, Arjun, Moustakas, John |
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| Rok vydání: | 2013 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0004-637X/779/2/137 |
| Popis: | We present Hubble Space Telescope near-IR spectroscopy for 18 galaxy clusters at 1.0 < $z$ < 1.5 in the IRAC Shallow Cluster Survey. We use Wide Field Camera 3 grism data to spectroscopically identify H$\alpha$ emitters in both the cores of galaxy clusters as well as in field galaxies. We find a large cluster-to-cluster scatter in the star formation rates within a projected radius of 500 kpc, and many of our clusters (~60%) have significant levels of star formation within a projected radius of 200 kpc. A stacking analysis reveals that dust reddening in these star-forming galaxies is positively correlated with stellar mass and may be higher in the field than the cluster at a fixed stellar mass. This may indicate a lower amount of gas in star-forming cluster galaxies than in the field population. Also, H$\alpha$ equivalent widths of star-forming galaxies in the cluster environment are still suppressed below the level of the field. This suppression is most significant for lower mass galaxies (log M$_{*}$ < 10.0 M$_{\odot}$). We therefore conclude that environmental effects are still important at 1.0 < $z$ < 1.5 for star-forming galaxies in galaxy clusters with log M$_{*}$ < 10.0 M$_{\odot}$. Comment: 44 page, 10 figures, 2 tables, and accepted for publication in ApJ |
| Databáze: | arXiv |
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