J/MNRAS/516/2162 Lensing/SED-fit of 78 high-z RELICS galaxies (Neufeld+, 2022)
RELICS small lensed z => 5.5 galaxies selected as potential Lyman continuum
leakers.
Neufeld C., Strait V., Bradac M., Lemaux B.C., Coe D., Yang L., Treu T.,
Zitrin A., Nonino M., Bradley L., Sharon K.
<Mon. Not. R. Astron. Soc. 516, 2162-2170 (2022)>
=2022MNRAS.516.2162N 2022MNRAS.516.2162N (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Gravitational lensing ; Photometry ; Infrared ;
Optical ; Magnitudes, absolute ; Ultraviolet ; Redshifts ;
Positional data ; Stars, masses ; Galaxies, radius ;
Equivalent widths ; Spectroscopy ; Star Forming Region
Keywords: gravitational lensing: strong - galaxies: evolution -
galaxies: fundamental parameters - galaxies: high-redshift
Abstract:
We present size measurements of 78 high-redshift (z => 5.5) galaxy
candidates from the Reionization Lensing Cluster Survey (RELICS).
These distant galaxies are well resolved due to the gravitational
lensing power of foreground galaxy clusters, imaged by the Hubble
Space Telescope and the Spitzer Space Telescope. We compute sizes
using the forward-modelling code lenstruction and account for
magnification using public lens models. The resulting size-magnitude
measurements confirm the existence of many small galaxies with
effective radii Reff < 200 pc in the early Universe, in agreement
with previous studies. In addition, we highlight compact and highly
star-forming sources with star formation rate surface densities
ΣSFR > 10M☉yr-1kpc-2 as possible Lyman continuum
leaking candidates that could be major contributors to the process of
reionization. Future spectroscopic follow-up of these compact galaxies
(e.g. with the James Webb Space Telescope) will further clarify their
role in reionization and the physics of early star formation.
Description:
In this work, we use data from the 188-orbit Hubble Treasury Program
RELICS which originally was identified using HST imaging. Here, we
focus on the high-redshift candidates with reliable Spitzer fluxes as
defined by Strait et al. (2020ApJ...888..124S 2020ApJ...888..124S). Thus all targets are
observed by HST WFC3 infrared, ACS optical and also Spitzer 3.6 and
4.5µm IRAC falicities (i.e see section 2.1 for extraction and
reduction data processes). Next, we model high-z galaxies in their
source planes with magnification maps giving us the opprtunity to
retreive intrinsic morphologies, sizes and lensing properties of 78
selected sources having good S/N data (i.e see section 2.2 and 2.3).
As explained in the section 3, we follow the lenstruction method to
measure size properties as Sersic radius. More, we MCMC process to
contruct statistical uncertainties on sizes (i.e section 3.1). We also
provide physical parameters redshifts, stellar masses and SFR obtained
by SED fitting using methods from Strait et al. (2020ApJ...888..124S 2020ApJ...888..124S).
Then, lensing, photometric and spectrsocpic fitting data are presented
for the 78 galaxy sources in table.dat (i.e section 4 for properties
comparison with previous studies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 464 78 Size measurements and other selected properties
of high-redshift galaxy sources
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See also:
J/MNRAS/501/1028 : Galaxies at z=1-3 lensed by six HFF clusters (Yang+, 2021)
J/MNRAS/428/1460 : Massive early-type galaxies (Buitrago+, 2013)
J/ApJ/927/81 : HFF cluster observations of z∼4-8 galaxies (Bouwens+, 2022)
J/ApJ/855/4 : Lyman break galaxies at z∼6-9 from HFF (Kawamata+, 2018)
J/ApJ/884/85 : RELICS: Reionization Lensing Cluster Survey (Coe+, 2019)
J/ApJ/910/135 : RELICS 6≲z≤8 galaxies with Spitzer & HST obs.
(Strait+, 2021)
J/ApJ/889/189 : Brightest high-z galaxies in RELICS clusters (Salmon+, 2020)
J/ApJ/835/113 : Galaxies ≳6 from the Hubble Frontier Fields
(Livermore+, 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/ApJ/843/41 : HST/WFC3 obs. of z∼2-8 galaxies in 4 HFF clusters
(Bouwens+, 2017)
J/ApJ/839/L11 : HST strong lensing analysis of PLCKG287.0+32.9
(Zitrin+, 2017)
J/ApJS/219/15 : Morphologies of z=0-10 galaxies with HST data
(Shibuya+, 2015)
J/ApJS/199/25 : CLASH sources for MACS1149.6+2223 (Postman+, 2012)
Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Object name identifier (id)
19- 37 F19.15 deg RAdeg Right ascension (J2000) (ra)
39- 57 F19.15 deg DEdeg Declination (J2000) (dec)
59- 63 F5.2 --- zpeak The peak redshift from the PDF of
redshift distribution (zpeak) (1)
65- 70 F6.3 --- zmed The median redshift also from PDF of
redshift distribution (z_med)
72- 90 F19.15 mag UVMag Intrinsic dereshifted absolute UV
AB magnitude (absmag)
92-111 F20.8 Msun M* Median stellar mass obtained from method
A of Strait et al. 2020ApJ...888..124S 2020ApJ...888..124S
(smass)
113-132 F20.9 Msun B_M* [] Upper 68 percent confidence limits of
M* corresponding to 84th percentile of
the posterior (smass_u68)
134-153 F20.9 Msun b_M* Lower 68 percent confidence limits of M*
corresponding to 16th percentile of the
posterior (smass_l68)
155-172 F18.16 kpc R* Measured Sersic radius as the semimajor
half-light or effective radius (r_eff)
174-191 F18.16 kpc B_R* Upper 68 percent confidence limits of R*
corresponding to 84th percentile of the
posterior (reffu68)
193-210 F18.16 kpc b_R* Lower 68 percent confidence limits of R*
corresponding to 16th percentile of the
posterior (reffl68)
212-229 F18.16 kpc Rc Circularized effective radii (reffcirc)
(2)
231-248 F18.16 kpc B_Rc Upper 68 percent confidence limits of
Rcirc corresponding to 84th percentile of
the posterior (reffcirc_u68)
250-267 F18.16 kpc b_Rc Lower 68 percent confidence limits of
Rcirc corresponding to 16th percentile of
the posterior (reffcirc_l68)
269-287 F19.16 Msun/yr SFR Star formation rate computed with method
described in Strait et al.
2020ApJ...888..124S 2020ApJ...888..124S (sfr)
289-307 F19.16 Msun/yr B_SFR [] Upper 68 percent confidence limits of
SFR corresponding to 84th percentile of
the posterior (sfr_u68)
309-327 F19.16 Msun/yr b_SFR Lower 68 percent confidence limits of SFR
corresponding to 84th percentile of the
posterior (sfr_l68)
329-350 F22.16 Msun/yr/kpc2 SSFR SFR surface density as ΣSFR =
SFR/2πRcirc (sfrd)
352-374 F23.16 Msun/yr/kpc2 B_SSFR [] Upper 68 percent confidence limits of
SigmaSFR corresponding to 84th percentile
of the posterior (sfrd_u68)
376-397 F22.17 Msun/yr/kpc2 b_SSFR Lower 68 percent confidence limits of
SigmaSFR corresponding to 84th percentile
of the posterior (sfrd_l68)
399-403 F5.2 --- mu Magnification factor µ computed from
glafic and lenstool lens model by relics
team to contruct magnification maps (mu)
405-424 F20.16 0.1nm EW ? The [OIII] + Hβ lines combined
equivalent width in rest-frame for IRAC
S/N > 3 detections (EW_OIII+Hb) (3)
426-444 F19.15 0.1nm B_EW ? Upper 68 percent confidence limits of
EW[OIII]+Hb corresponding to 84th percent
of the posterior (EWOIII+Hbu68)
446-464 F19.15 0.1nm b_EW ? Lower 68 percent confidence limits of
EW[OIII]+Hb corresponding to 16th percent
of the posterior (EWOIII+Hbl68)
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Note (1): Calculated from the SED fitting method described in
Strait et al. 2020ApJ...888..124S 2020ApJ...888..124S.
Note (2): As Reff*sqrt(1-e) with ellipticity e = 1-sqrt(1-c2) and
eccentricity c determined by best-fitting parameters output by
LENSTRUCTION algorithm.
Note (3): As measured with method B from Strait et al. 2020ApJ...888..124S 2020ApJ...888..124S.
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History:
From electronic version of the journal
(End) Luc Trabelsi [CDS] 21-Jul-2025