Far-Ultraviolet Number Counts of Field Galaxies

Abstract

The far-ultraviolet (FUV) number counts of galaxies constrain the evolution of the star-formation rate density of the universe. We report the FUV number counts computed from FUV imaging of several fields including the Hubble Ultra Deep Field, the Hubble Deep Field North, and small areas within the GOODS-North and -South fields. These data were obtained with the Hubble Space Telescope Solar Blind Channel of the Advance Camera for Surveys. The number counts sample a FUV AB magnitude range from 21-29 and cover a total area of 15.9 arcmin^2, ~4 times larger than the most recent HST FUV study. Our FUV counts intersect bright FUV GALEX counts at 22.5 mag and they show good agreement with recent semi-analytic models based on dark matter "merger trees" by Somerville et al. (2011). We show that the number counts are ~35% lower than in previous HST studies that use smaller areas. The differences between these studies are likely the result of cosmic variance; our new data cover more lines of sight and more area than previous HST FUV studies. The integrated light from field galaxies is found to contribute between 65.9 +/-8 - 82.6 +/-12 photons/s/cm^2/sr/angstrom to the FUV extragalactic background. These measurements set a lower limit for the total FUV background light.

Accepted for publication in ApJ, including 34 pages, 6 figures, and 2 tables

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• Very high energy gamma-ray emission beyond 10 TeV from GRB 221009A
• Measurement of the Extragalactic Background Light using MAGIC and Fermi-LAT gamma-ray observations of blazars up to z = 1
• MAGIC observations of the February 2014 flare of 1ES 1011+496 and ensuing constraint of the EBL density
• A GeV-TeV Measurement of the Extragalactic Background Light
• The Diffuse Galactic Far-Ultraviolet Sky
• The Diffuse Radiation Field at High Galactic Latitudes
• Gamma-rays as probes of the Universe
• Components of the Diffuse Ultraviolet Radiation at High Latitudes
• Galaxy Cluster Contribution to the Diffuse Extragalactic Ultraviolet Background
• Dust Scattered Radiation in the Galactic Poles