#Canada france hawaii telescope alan series#

Galaxies with low Hα/ ratios are very rare at the brighter fluxes that future near-infrared grism surveys will probe our survey finds no galaxies with Hα/ < 0.95 that have Hα flux greater than 3 × 10-16 erg s -1 cm-2. Hα-emitting galaxies with comparable flux are roughly five times less common than galaxies with just Hα emission at those flux levels. Cumulative number counts of 0.7 < z < 1.5 galaxies reach 10,000 deg-2 above an Hα flux of 2 × 10-16 erg s-1 cm-2. The WISP survey is sensitive to fainter flux levels ((3-5) × 10-17 erg s-1 cm-2) than the future space near-infrared grism missions aimed at baryonic acoustic oscillation cosmology ((1-4) × 10-16 erg s-1 cm-2), allowing us to probe the fainter emission line galaxies that the shallower future surveys may miss. We use simulations to correct for significant (>20%) incompleteness introduced in part by the non-dithered, non-rotated nature of the grism parallels. Altogether we identify 1048 emission line galaxies with observed equivalent widths greater than 40 Å, 467 of which have multiple detected emission lines. We present near-infrared emission line counts and luminosity functions from the Hubble Space Telescope Wide Field Camera 3 Infrared Spectroscopic Parallels (WISP) program for 29 fields (0.037 deg2) observed using both the G102 and G141 grism.

#Canada france hawaii telescope alan series#

This is the first in a series of papers based on FastSound data, and we describe the details of the survey design, target selection, observations, data reduction, and emission line detections. Emission lines were detected from ∼4,000 star forming galaxies by an automatic line detection algorithm applied to 2D spectral images. In total, we achieved 121 pointings of FMOS (each pointing has a 30 arcmindiameter circular footprint) covering 20.6^2 by tiling the four fields of the CFHTLS Wide in a hexagonal pattern. The survey started in March 2012, and all the observations were completed in July 2014. The target galaxies were selected based on photometric redshifts and Hα flux estimates calculated by fitting spectral energy distribution (SED) models to the five optical magnitudes of the Canada France Hawaii Telescope Legacy Survey (CFHTLS) Wide catalog. The primary goal of the survey is to detect redshift space distortions (RSD), to test General Relativity by measuring the growth rate of large scale structure and to constrain modified gravity models for the origin of the accelerated expansion of the universe.

FastSound is a galaxy redshift survey using the near-infrared Fiber Multi-Object Spectrograph (FMOS) mounted on the Subaru Telescope, targeting Hα emitters at z∼1.18–1.54 down to the sensitivity limit of Hα flux ∼2×10^(−16) erg cm^(−2) s^(−1).