J/ApJ/820/98 Galaxy candidates in the Hubble Frontier Fields (Laporte+, 2016)
Young galaxy candidates in the Hubble Frontier Fields.
III. MACS J0717.5+3745.
Laporte N., Infante L., Troncoso Iribarren P., Zheng W., Molino A.,
Bauer F.E., Bina D., Broadhurst T., Chilingarian I., Garcia S., Kim S.,
Marques-Chaves R., Moustakas J., Pello R., Perez-Fournon I., Shu X.,
Streblyanska A., Zitrin A.
<Astrophys. J., 820, 98 (2016)>
=2016ApJ...820...98L 2016ApJ...820...98L (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; Gravitational lensing ;
Photometry, HST ; Photometry, infrared ; Redshifts
Keywords: cosmology: observations -
galaxies: clusters: individual: MACS J0717.5+3745 -
galaxies: high-redshift - gravitational lensing: strong
Abstract:
In this paper we present the results of our search for and study of
z≳6 galaxy candidates behind the third Frontier Fields (FFs) cluster,
MACS J0717.5+3745, and its parallel field, combining data from Hubble
and Spitzer. We select 39 candidates using the Lyman break technique,
for which the clear non-detection in optical make the extreme mid-z
interlopers hypothesis unlikely. We also take benefit from z≳6
samples selected using the previous FF data sets of Abell 2744 and
MACS 0416 to improve the constraints on the properties of very high
redshift objects. We compute the redshift and the physical properties
such emission lines properties, star formation rate, reddening, and
stellar mass for all FF objects from their spectral energy
distribution using templates including nebular emission lines. We
study the relationship between several physical properties and confirm
the trend already observed in previous surveys for evolution of star
formation rate with galaxy mass and between the size and the UV
luminosity of our candidates. The analysis of the evolution of the UV
luminosity function with redshift seems more compatible with an
evolution of density. Moreover, no robust z≥8.5 object is selected
behind the cluster field and few z∼9 candidates have been selected
in the two previous data sets from this legacy survey, suggesting a strong
evolution in the number density of galaxies between z∼8 and 9. Thanks
to the use of the lensing cluster, we study the evolution of the star
formation rate density produced by galaxies with L>0.03 L*, and
confirm the strong decrease observed between z∼8 and 9.
Description:
The Frontier Field (FF) project is carried out using HST Director's
Discretionary Time and will use 840 orbits during Cycles 21, 22, and
23 with six strong-lensing galaxy clusters as the main targets. For each
cluster, the final data set is composed of three images from ACS/HST
(F435W, F606W, and F814W) and four images from WFC3/HST (F105W, F125W,
F140W, and F160W) reaching depths of ∼29 mag at 5σ in a 0.4"
diameter aperture. In this study, we used the final data release on
MACS J0717.5+3745 (z=0.551, Ebeling et al. 2004ApJ...609L..49E 2004ApJ...609L..49E;
Medezinski et al. 2013ApJ...777...43M 2013ApJ...777...43M) made public on 2015 April 1.
This third cluster in the FF list has been observed by HST through
several observing programs, mainly those related to CLASH (ID: 12103,
PI: M. Postman) and the FFs (ID: 13498, PI: J. Lotz).
We matched the HST data with deep Spitzer/IRAC images obtained from
observations (ID: 90259) carried out from 2013 August to 2015 January
combined with archival data from 2007 November to 2013 June.
Objects:
-----------------------------------------------------------------------
RA (ICRS) DE Designation(s)
-----------------------------------------------------------------------
07 17 36.50 +37 45 23.0 MACS J0717.5+3745 = ClG J0717+3745
00 14 20.03 -30 23 17.8 Abell 2744 = ACO 2744
04 16 08.38 -24 04 20.8 MACS J0416.1-2403 = 1RXS J041609.9-240358
-----------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 120 28 6≤z≤8 Objects Selected on the Cluster Field
table3.dat 120 8 z≳8 Objects Selected in the Parallel Field
table4.dat 120 34 6≤z≤8 Objects Selected in the Parallel Field
table5.dat 47 39 Photometric Redshift Computed in two Ways:
χ2 Minimization and Bayesian Approach
table6.dat 108 39 Physical Properties of Candidates Selected
on MACS 0717 Data
table7.dat 108 61 Physical Properties of all Candidates Selected
in the First Three Frontier Fields
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See also:
J/A+A/500/947 : Spectroscopy and photometry in A2744 and A2537
(Braglia+, 2009)
J/ApJ/762/L30 : CLASH: MCS J0416.1-2403 strong lensing analysis
(Zitrin+, 2013)
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/MNRAS/452/1437 : Abell 2744 strong-lensing analysis (Jauzac+, 2015)
J/ApJ/835/113 : Galaxies ≳6 from the Hubble Frontier Fields
(Livermore+, 2017)
Byte-by-byte Description of file: table2.dat table3.dat table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- ID [802/91692] Galaxy candidate identifier
7- 17 F11.7 deg RAdeg Right Ascension in decimal degrees (J2000)
19- 28 F10.7 deg DEdeg Declination in decimal degrees (J2000)
30 A1 --- l_F814W [>] Limit flag on F814W (not in table3)
31- 35 F5.2 mag F814W ? HST/ACS F814W AB magnitude (not in table3)
37- 40 F4.2 mag e_F814W ? Uncertainty in F814W (not in table3) (1)
42- 46 F5.2 mag F105W HST/WFC3 F105W AB magnitude
48- 51 F4.2 mag e_F105W Uncertainty in F105W (1)
53- 57 F5.2 mag F125W HST/WFC3 F125W AB magnitude
59- 62 F4.2 mag e_F125W Uncertainty in F125W (1)
64- 68 F5.2 mag F140W HST/WFC3 F140W AB magnitude
70- 73 F4.2 mag e_F140W Uncertainty in F140W (1)
75- 79 F5.2 mag F160W HST/WFC3 F160W AB magnitude
81- 84 F4.2 mag e_F160W Uncertainty in F160W (1)
86 A1 --- l_3.6mag [>] Limit flag on 3.6mag
87- 91 F5.2 mag 3.6mag ? Spitzer/IRAC 3.6µm band AB magnitude
93- 96 F4.2 mag e_3.6mag ? Uncertainty in 3.6mag (1)
98 A1 --- n_3.6mag [b] Note on 3.6mag (not in table3),
b for blended
100 A1 --- l_4.5mag [>] Limit flag on 4.5mag
101-105 F5.2 mag 4.5mag ? Spitzer/IRAC 4.5µm band AB magnitude
107-110 F4.2 mag e_4.5mag ? Uncertainty in 4.5mag (1)
112 A1 --- n_4.5mag [b] Note on 4.5mag (not in table3),
b for blended
114-119 F6.2 --- chi2opt Optical χ2 value
120 A1 --- n_chi2opt [n] Note on chi2opt (2)
--------------------------------------------------------------------------------
Note (1): All error bars are computed from noise measured in 0.4" diameter
apertures distributed over each object.
Note (2): Note as follows:
n = Object that has a χopt2 consistent with a non-detection in
optical.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- ID [2035/91692] Galaxy candidate identifier
6 A1 --- n_ID [ab] Note on ID (1)
8- 11 F4.2 --- zH Photometric redshift from Hyperz
(Bolzonella et al. 2000A&A...363..455P 2000A&A...363..455P)
13- 16 F4.2 --- b_zH 1σ error interval on zH, lower value
18- 21 F4.2 --- B_zH 1σ error interval on zH, upper value
23- 26 F4.2 --- zBPZ Photometric redshift from BPZ
(Benitez 2000ApJ...536..561G 2000ApJ...536..561G)
28- 31 F4.2 --- b_zBPZ 1σ error interval on zBPZ, lower value
33- 36 F4.2 --- B_zBPZ 1σ error interval on zBPZ, upper value
38- 42 F5.2 --- mu Amplification (2)
44- 47 F4.2 --- e_mu ? Uncertainty in mu
--------------------------------------------------------------------------------
Note (1): Note as follows:
a = Object confirmed by HST-spectroscopy at z=6.51 in Schmidt et al.
(2016ApJ...818...38S 2016ApJ...818...38S);
b = Objects confirmed by spectroscopy at z=6.39 in Vanzella et al.
(2014ApJ...783L..12V 2014ApJ...783L..12V).
Note (2): For objects selected in a parallel field, we set the amplification at
µ=1.1.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- ID Galaxy candidate identifier
11- 14 F4.2 --- z Photometric redshift
16- 19 F4.1 [Msun] logM* Log of stellar mass
21- 23 F3.1 [Msun] E_logM* Upper 1σ limit uncertainty in logM*
25- 27 F3.1 [Msun] e_logM* Lower 1σ limit uncertainty in logM*
29- 32 F4.1 [Msun/yr] logSFR Log of star formation rate
34- 36 F3.1 [Msun/yr] E_logSFR Upper 1σ limit uncertainty in logSFR
38- 40 F3.1 [Msun/yr] e_logSFR Lower 1σ limit uncertainty in logSFR
42- 44 F3.1 Gyr Age Galaxy candidate age
46- 48 F3.1 Gyr E_Age Upper 1σ limit uncertainty in Age
50- 52 F3.1 Gyr e_Age Lower 1σ limit uncertainty in Age
54- 56 F3.1 --- Av Dust extinction
58- 60 F3.1 --- E_Av Upper 1σ limit uncertainty in Av
62- 64 F3.1 --- e_Av Lower 1σ limit uncertainty in Av
66- 70 A5 --- Cluster Cluster of galaxy identifer (1)
72-108 A37 --- Ref Reference (only in table7)
--------------------------------------------------------------------------------
Note (1): Cluster as follows:
M0717 = MACS J0717.5+3745;
A2744 = Abell 2744;
M0416 = MACS J0416.1-2403.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Zheng et al. Paper I. 2014ApJ...795...93Z 2014ApJ...795...93Z
Infante et al. Paper II. 2015ApJ...815...18I 2015ApJ...815...18I
Zheng et al. Paper IV. 2017ApJ...836..210Z 2017ApJ...836..210Z
(End) Tiphaine Pouvreau [CDS] 07-Feb-2018