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Paper: Estimates of the Star Formation Rate Density Between 0.7<z<1.8
Volume: 240, Gas and Galaxy Evolution: A Conference in Honor of the 20th Anniversary of the VLA
Page: 127
Authors: Hopkins, A. M.; Connolly, A. J.; Szalay, A. S.
Abstract: We present an analysis of the star formation rate in galaxies between 0.7<z<1.8 using Near Infrared Camera and Multi-Object Spectrograph (NICMOS) grism spectral observations. We detect 163 galaxies in an area of ~ 4.4 arcmin2, 37 of which show possible Hα emission. We extend the observed Hα luminosity function (LF) in this redshift range to luminosities a factor of two fainter than earlier work, and are consistent in the region of overlap. Using the Hα LF, we estimate a star formation rate (SFR) density in this redshift range of 0.166 Msolar yr-1 Mpc-3 (H0=75 km s-1 Mpc-1), consistent with other estimates based on emission lines, and supporting the order-of-magnitude increase in SFR density between z=0 and z=1. Our measurement of the SFR density is a factor of ≈ 2-3 greater than that estimated from UV data, comparable to the factor observed locally, implying little evolution in the relative extinctions between UV and Hα out to z≈1.3.
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