HUBBLE FRONTIER FIELDS FIRST COMPLETE CLUSTER DATA: FAINT GALAXIES AT z ∼ 5–10 FOR UV LUMINOSITY FUNCTIONS AND COSMIC REIONIZATION
By M. Ishigaki, Ryota Kawamata, M. Ouchi, M. Oguri, K. Shimasaku, Yoshiaki Ono. 2014
136 citations recorded by the source corpus.
We present comprehensive analyses of faint dropout galaxies up to z ∼ 10 with the first full-depth data set of the A2744 lensing cluster and parallel fields observed by the Hubble Frontier Fields (HFF) program. We identify 54 dropouts at z ∼ 5–10 in the HFF fields and enlarge the size of the z ∼ 9 galaxy sample obtained to date. Although the number of highly magnified (μ ∼ 10) galaxies is small because of the tiny survey volume of strong lensing, our study reaches the galaxies' intrinsic luminosities comparable to the deepest-field HUDF studies. We derive UV luminosity functions with these faint dropouts, carefully evaluating by intensive simulations the combination of observational incompleteness and lensing effects in the image plane, including magnification, distortion, and multiplication of images, with the evaluation of mass model dependencies. Our results confirm that the faint-end slope, α, is as steep as −2 at z ∼ 6–8 and strengthen the evidence for the rapid decrease of UV luminosity densities, ρUV, at z > 8 from the large z ∼ 9 sample. We examine whether the rapid ρUV decrease trend can be reconciled with the large Thomson scattering optical depth, τe, measured by cosmic microwave background experiments, allowing a large space of free parameters, such as an average ionizing photon escape fraction and a stellar-population-dependent conversion factor. No parameter set can reproduce both the rapid ρUV decrease and the large τe. It is possible that the ρUV decrease moderates at z ≳ 11, that the free parameters significantly evolve toward high z, or that there exist additional sources of reionization such as X-ray binaries and faint active galactic nuclei.
Subfields: Astronomy and Astrophysics, Electrical and Electronic Engineering, Instrumentation
View Paper: https://www.semanticscholar.org/paper/63d9b2a00aee9ffd12741147718640c9b37067d4
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Citations in the corpus
- The Dearth of z ∼ 10 Galaxies in All HST Legacy Fields—The Rapid Evolution of the Galaxy Population in the First 500 Myr (2017, background): “Several authors have already exploited the HFF dataset for high-redshift searches extending out to z ∼ 10 (Zitrin et al. 2014; Oesch et al. 2015; Infante et al. 2015; Ishigaki et al. 2015, 2017; McLeod et al. 2016).”
- Full-data Results of Hubble Frontier Fields: UV Luminosity Functions at z ∼ 6–10 and a Consistent Picture of Cosmic Reionization (2017, methodology): “The total 6 http://www.stsci.edu/hst/campaigns/frontier-fields/ magnitudes of galaxiesmtot are defined with the equation mtot = mAP − 0.82, where the offset 0.82 corresponds to the aperture correction and was derived in Ishigaki et al. (2015).”
- Radiation Backgrounds at Cosmic Dawn: X-Rays from Compact Binaries (2016, unknown): “…in Figure 1, this is an updated version of the formula given in Equation (15) of Madau & Dickinson (2014) that better reproduces a number of recent 4 ∼ < z ∼< 10 results (Bowler et al. 2015; Finkelstein et al. 2015; Ishigaki et al. 2015; McLeod et al. 2015; Oesch et al. 2015; McLeod et al. 2016).”
- New redshift z ≃ 9 galaxies in the Hubble Frontier Fields: implications for early evolution of the UV luminosity density (2014, methodology): “…completed in early 2014 and has been explored by several authors (Zheng et al. 2014; Zitrin et al. 2014a; Ishigaki et al. 2014; Atek et al. 2014; Oesch et al. 2014), while the Abell-2744 parallel field has also been interrogated for high-redshift galaxies (Ishigaki et al. 2014; Oesch et al. 2014b).”