THE EVOLUTION of the FAR-UV LUMINOSITY FUNCTION and STAR FORMATION RATE DENSITY of the CHANDRA DEEP FIELD SOUTH from z = 0.2 to 1.2 with SWIFT/UVOT

Lea M.Z. Hagen, Erik A. Hoversten, Caryl Gronwall, Christopher Wolf, Michael H. Siegel, Mathew Page, Alex Hagen

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4 Scopus citations

Abstract

We use deep Swift UV/Optical Telescope (UVOT) near-ultraviolet (1600-4000 Å) imaging of the Chandra Deep Field South to measure the rest-frame far-UV (FUV; 1500 Å) luminosity function (LF) in four redshift bins between z = 0.2 and 1.2. Our sample includes 730 galaxies with u < 24.1 mag. We use two methods to construct and fit the LFs: the traditional Vmax method with bootstrap errors, and a maximum likelihood estimator. We observe luminosity evolution such that M∗ fades by ∼2 mag from z ∼ 1 to z ∼ 0.3, implying that star formation activity was substantially higher at z ∼ 1 than today. We integrate our LFs to determine the FUV luminosity densities and star formation rate densities (SFRDs) from z = 0.2 to 1.2. We find evolution consistent with an increase proportional to (1 + z)1.9 out to z ∼ 1. Our luminosity densities and star formation rates are consistent with those found in the literature but are, on average, a factor of ∼2 higher than previous FUV measurements. In addition, we combine our UVOT data with the MUSYC survey to model the galaxies' ultraviolet-to-infrared spectral energy distributions and estimate the rest-frame FUV attenuation. We find that accounting for the attenuation increases the SFRDs by ∼1 dex across all four redshift bins.

Original languageEnglish (US)
Article number178
JournalAstrophysical Journal
Volume808
Issue number2
DOIs
StatePublished - Aug 1 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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