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J/ApJ/835/113  Galaxies ≳6 from the Hubble Frontier Fields  (Livermore+, 2017)

Directly observing the galaxies likely responsible for reionization. Livermore R.C., Finkelstein S.L., Lotz J.M. <Astrophys. J., 835, 113-113 (2017)> =2017ApJ...835..113L (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Redshifts Keywords: galaxies: high-redshift; galaxies: luminosity function, mass function; dark ages, reionization, first stars Abstract: We report a new analysis of the Hubble Frontier Fields clusters Abell2744 and MACS 0416 using wavelet decomposition to remove the cluster light, enabling the detection of highly magnified (>50x) galaxies a factor of 10x fainter in luminosity than previous studies. We find 167 galaxies at z≳6, and with this sample we are able to characterize the UV luminosity function to MUV=-12.5 at z∼6, -14 at z∼7, and -15 at z∼8. We find a steep faint-end slope (α< -2), and with our improved statistics at the faint end we reduce the fractional uncertainty on α to <2% at z∼6-7 and 4% at z∼8. We also investigate the systematic uncertainty due to the lens modeling by using every available lens model individually and comparing the results; this systematic fractional uncertainty on α is <4% at all redshifts. We now directly observe galaxies in the luminosity regime where some simulations predict a change in the faint-end slope of the luminosity function, yet our results provide statistically very strong evidence against any turnover in the luminosity range probed, more consistent with simulations in which stars form in lower-mass halos. Thus, we find strong support for the extension of the steep luminosity function to MUV=-13 at z>6, consistent with the number of faint galaxies needed to reionize the universe under standard assumptions. Description: The data comprise two lensing clusters observed with the Advanced Camera for Surveys (ACS) and WFC3 on HST as part of the Hubble Frontier Fields (HFF) program. The clusters are observed in seven filters (F435W, F606W, F814W, F105W, F125W, F140W and F160W) and the drizzled science images and inverse variance weight maps were publicly released on the HFF Web site. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table7.dat 85 105 Catalog of the z∼6 sample table8.dat 85 40 Catalog of the z∼7 sample table9.dat 85 16 Catalog of the z∼8 sample
See also: J/ApJ/756/164 : UV galaxies in CANDELS from z=8 to z=4 (Finkelstein+, 2012) J/ApJ/762/L30 : CLASH: MCS J0416.1-2403 strong lensing analysis (Zitrin+, 2013) J/ApJ/793/115 : UV-continuum slopes beta for z∼4-8 galaxies (Bouwens+, 2014) J/MNRAS/443/1549 : MACSJ0416.1-2403 strong-lensing analysis (Jauzac+, 2014) J/MNRAS/444/268 : HST Frontier Fields clusters (Richard+, 2014) J/ApJ/800/18 : HST/WFC3 observations of z∼7-8 galaxies in A2744 (Atek+, 2015) J/ApJ/803/34 : z∼4-10 galaxies from HST legacy fields (Bouwens+, 2015) J/ApJ/810/71 : UV mag of candidate galaxies at 3~<z~<8.5 (Finkelstein+, 2015) J/MNRAS/452/1437 : Abell 2744 strong-lensing analysis (Jauzac+, 2015) J/ApJ/811/29 : GLASS. IV. Lensing cluster Abell 2744 (Wang+, 2015) J/A+A/590/A31 : ASTRODEEP Frontier Fields Catalogues (Merlin+, 2016) http://archive.stsci.edu/pub/hlsp/frontier/ : Hubble Frontier Field data http://www.stsci.edu/hst/campaigns/frontier-fields/Lensing-Models : Frontier Field lensing models Byte-by-byte Description of file: table[789].dat
Bytes Format Units Label Explanations
1- 15 A15 --- ID Identifier 17- 25 F9.6 deg RAdeg Right ascension in decimal degrees (J2000) 27- 36 F10.6 deg DEdeg Declination in decimal degrees (J2000) 38- 41 F4.2 --- z [5.3/8.9] Photometric redshift 43- 46 F4.2 --- e_z [0.09/3.1] Negative error in z (1) 48- 51 F4.2 --- E_z [0.04/2]? Positive error in z (1) 53- 57 F5.1 --- mu [1.2/110] Magnification (2) 59- 62 F4.1 --- e_mu [0.1/58] Negative error in mu 64- 68 F5.1 --- E_mu [0/690] Positive error in mu 70- 75 F6.2 mag M1500 [-20.4/-12.4] Intrinsic rest-frame UV AB magnitude 77- 80 F4.2 mag e_M1500 [0.1/4.1] Negative error in M1500 (3) 82- 85 F4.2 mag E_M1500 [0.2/0.8] Positive error in M1500 (3)
Note (1): The errors given encompass the 68% confidence interval of the photo-z. Note (2): The magnification given is the median and interquartile range from all lens models of the clusters updated after the Frontier Fields data were obtained. Note (3): The errors on the intrinsic magnitudes incorporate the errors on the measured fluxes and the magnification uncertainty.
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 06-Oct-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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