J/ApJ/927/81 HFF cluster observations of z∼4-8 galaxies (Bouwens+, 2022)
Sizes of lensed lower-luminosity z=4-8 galaxies from the Hubble Frontier Field
Program.
Bouwens R.J., Illingworth G.D., van Dokkum P.G., Oesch P.A., Stefanon M.,
Ribeiro B.
<Astrophys. J., 927, 81 (2022)>
=2022ApJ...927...81B 2022ApJ...927...81B
ADC_Keywords: Clusters, galaxy; Gravitational lensing; Magnitudes, absolute;
Ultraviolet; Galaxies, radius
Keywords: Gravitational lensing ; Dwarf galaxies
Abstract:
We constrain the rest-UV size-luminosity relation for star-forming
galaxies at z∼4 and z∼6, 7, and 8 identified behind clusters from the
Hubble Frontier Fields (HFF) program. The size-luminosity relation is
key to deriving accurate luminosity functions (LF) for faint galaxies.
Making use of the latest lensing models and full data set for these
clusters, lensing-corrected sizes and luminosities are derived for
68 z∼4, 184 z∼6, 93 z ∼7, and 53 z∼8 galaxies. We show that size
measurements can be reliably measured up to linear magnifications of
∼30x, where the lensing models are well calibrated. The sizes we
measure span a >1dex range, from <50pc to ≳500pc. Uncertainties are
based on both the formal fit errors and systematic differences between
the public lensing models. These uncertainties range from ∼10pc for
the smallest sources to 100pc for the largest. Using a
forward-modeling procedure to model the impact of incompleteness and
magnification uncertainties, we characterize the size-luminosity
relation at both z∼4 and z∼6-8. We find that the source sizes of
star-forming galaxies at z∼4 and z∼6-8 scale with luminosity L as
L0.54±0.08 and L_0.40±0.04^, respectively, such that
lower-luminosity (≳-18mag) galaxies are smaller than expected from
extrapolating the size-luminosity relation at high luminosities
(≲-18mag). The new evidence for a steeper size-luminosity relation
(3σ) adds to earlier evidence for small sizes based on the
prevalence of highly magnified galaxies in high-shear regions,
theoretical arguments against upturns in the LFs, and other
independent determinations of the size-luminosity relation from the
HFF clusters.
Description:
In our analysis, we make use of the v1.0 reductions of the HST
observations over all six clusters that make up the HFF program (Coe+
2015ApJ...800...84C 2015ApJ...800...84C ; Lotz+ 2017ApJ...837...97L 2017ApJ...837...97L). These reductions
include all 140 orbits of HST imaging observations obtained over each
cluster (70 optical/ACS, 70 near-IR/WFC3/IR) plus all additional
archival observations taken over each cluster as a result of other
programs, e.g., CLASH (Postman+ 2012ApJS..199...25P 2012ApJS..199...25P) or GLASS
(Schmidt+ 2014ApJ...786...57S 2014ApJ...786...57S).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 106 409 Properties of the present compilation z=6-8 and
z∼4 sources over the HFF clusters
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/AJ/127/2856 : Brown dwarfs in the 2MASS Survey (Burgasser+, 2004)
J/AJ/132/1729 : HUDF BVI-dropout sources (Beckwith+, 2006)
J/ApJ/728/27 : Chandra & AAOmega observations of Abell 2744 (Owers+, 2011)
J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)
J/ApJS/199/25 : CLASH sources for MACS1149.6+2223 (Postman+, 2012)
J/ApJ/762/L30 : 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/444/268 : HST Frontier Fields clusters (Richard+, 2014)
J/ApJ/803/34 : z∼4-10 galaxies from HST legacy fields (Bouwens+, 2015)
J/MNRAS/452/1437 : Abell 2744 strong-lensing analysis (Jauzac+, 2015)
J/ApJS/219/15 : Morphologies of z=0-10 galaxies with HST (Shibuya+, 2015)
J/ApJ/801/44 : HST lensing analysis of the CLASH sample (Zitrin+, 2015)
J/ApJ/819/114 : Strong lensing mass modeling of 4 HFF cl. (Kawamata+, 2016)
J/ApJ/820/98 : Galaxy cand. in the Hubble Frontier Fields (Laporte+, 2016)
J/A+A/590/A31 : ASTRODEEP Frontier Fields Catalogues (Merlin+, 2016)
J/ApJ/843/41 : HST/WFC3 obs. of z∼2-8 gal. in 4 HFF cl. (Bouwens+, 2017)
J/A+A/600/A90 : MACS J0416.1-2403 redshift catalogue (Caminha+, 2017)
J/MNRAS/469/3946 : Abell 370 MUSE redshifts (Lagattuta+, 2017)
J/ApJ/835/113 : Gal. ≳6 from the Hubble Frontier Fields (Livermore+, 2017)
J/A+A/608/A142 : Fornax Deep Survey with VST. III. LSB gal. (Venhola+, 2017)
J/ApJ/854/73 : Full-data results of HFF: galaxies z∼6-9 (Ishigaki+, 2018)
J/ApJ/855/4 : Lyman break galaxies at z∼6-9 from HFF (Kawamata+, 2018)
J/MNRAS/473/663 : MUSE and HFFs Photometry of A2744 (Mahler+, 2018)
J/A+A/620/A165 : Fornax Deep Survey with VST. IV. dwarf gal. (Venhola+, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- ID Source ID
20- 21 I2 h RAh Hour of Right Ascension (J2000)
23- 24 I2 min RAm Minute of Right Ascension (J2000)
26- 30 F5.2 s RAs Second of Right Ascension (J2000)
32 A1 --- DE- Sign of the Declination (J2000)
33- 34 I2 deg DEd Degree of Declination (J2000)
36- 37 I2 arcmin DEm Arcminute of Declination (J2000)
39- 42 F4.1 arcsec DEs Arcsecond of Declination (J2000)
44- 48 F5.1 mag UVMag [-21.7/-12.5] Absolute AB magnitude
in UV continuum (1)
50- 52 F3.1 mag e_UVMag [0/3]? Lower 1σ uncertainty on UVMag
54- 56 F3.1 mag E_UVMag [0/4]? Upper 1σ uncertainty on UVMag
58- 62 F5.1 --- TMagnf [1.3/235] Total Magnification Factor, µ (2)
64- 68 F5.1 --- e_TMagnf [0/208]? Lower 1σ uncertainty on TMagnf
70- 75 F6.1 --- E_TMagnf [0/5473]? Upper 1σ uncertainty on TMagnf
77- 81 F5.1 --- LMagnf [1.3/153] Linear Magnification Factor,
µ1D (3)
83- 87 F5.1 --- e_LMagnf [0/130]? Lower 1σ uncertainty on LMagnf
89- 93 F5.1 --- E_LMagnf [0/950]? Upper 1σ uncertainty on LMagnf
95- 98 I4 pc re [9/942] Half-Light Radius (1)
100-102 I3 pc e_re [4/239]? Lower 1σ uncertainty on re
104-106 I3 pc E_re [8/676]? Upper 1σ uncertainty on re
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Note (1): In cases where the median total magnification and linear
magnification exceeds 50 and 30, respectively, we quote alternative
estimates for the absolute magnitude UVMag and physical size re with the
total and linear magnification fixed to 50 and 30, respectively. This
alternate estimates of UVMag and re are provided for sources given the
challenges in relying upon magnification factors in excess of these
values (Section 4.2 and Bouwens+ 2017ApJ...843..129B 2017ApJ...843..129B).
Note (2): Derived weighting equally the latest public version 3/4 parametric
models from each lensing methodology (Section 4.1).
Note (3): Along the major shear axis TMagnf0.5S0.5 weighting equally the
parametric models from each lensing methodology. This is the same
quantity as µtang reported by Vanzella+ (2017MNRAS.467.4304V 2017MNRAS.467.4304V).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 15-Nov-2023