J/A+A/590/A31 ASTRODEEP Frontier Fields Catalogues (Merlin+, 2016)
The ASTRODEEP Frontier Fields Catalogues:
I - Multiwavelength photometry of Abell-2744 and MACS-J0416.
Merlin E., Amorin R., Castellano M., Fontana A., Buitrago F., Dunlop J.S.,
Elbaz D., Boucaud A., Bourne N., Boutsia K., Brammer G., Bruce V.A.,
Capak P., Cappelluti N., Ciesla L., Comastri A., Cullen F., Derriere S.,
Faber S.M., Ferguson H.C., Giallongo E., Grazian A., Lotz J.,
Michalowski M., Paris D., Pentericci L., Pilo S., Santini P., Schreiber C.,
Shu X., Wang T.
<Astron. Astrophys. 590, A30 (2016)>
=2016A&A...590A..30M 2016A&A...590A..30M
II - Photometric redshifts and rest-frame properties in Abell-2744 and
MACS-J0416.
Castellano M., Amorin R., Merlin E., Fontana A., McLure R.J.,
Marmol-Queralto E., Mortlock A., Parsa S., Dunlop J.S., Elbaz D.,
Balestra I., Boucaud A., Bourne N., Boutsia K., Brammer G., Bruce V.A.,
Buitrago F., Capak P., Cappelluti N., Ciesla L., Comastri A., Cullen F.,
Derriere S., Faber S.M., Giallongo E., Grazian A., Grillo C., Mercurio A.,
Michalowski M.J., Nonino M., Paris D., Pentericci L., Pilo S., Rosati P.,
Santini P., Schreiber C., Shu X., Wang T.
<Astron. Astrophys. 590, A31 (2016)>
=2016A&A...590A..31C 2016A&A...590A..31C
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Cross identifications ;
Redshifts
Keywords: catalogs - methods: data analysis - galaxies: photometry -
galaxies: high-redshift - galaxies: distances and redshifts
Abstract:
We present multiwavelength photometric catalogues (HST, Spitzer and
Hawk-I K band) for the first two of the Frontier Fields, Abell2744 and
MACSJ0416 (plus their parallel fields). To detect faint sources even
in the central regions of the clusters, we develop a robust and
repeatable procedure that uses the public codes Galapagos and Galfit
to model and remove most of the light contribution from both the
brightest cluster members as well as the ICL. We perform the detection
on the HST H160 processed image to obtain a pure H-selected sample. We
also add a sample of sources which are undetected in the H160 image
but appear on a stacked infrared image. Photometry in the other HST
bands is obtained using SExtractor, performed again on residual images
after the Galfit procedure for foreground light removal. Photometry on
the Hawk-I and IRAC bands has been obtained using our PSF-matching
deconfusion code T-PHOT. A similar procedure, but without the need for
the foreground light removal, is adopted for the Parallel fields. The
procedure allows for the detection and the photometric measurements of
∼2500 sources per field. We deliver and release complete photometric
H-detected catalogues, with the addition of a complementary sample of
infrared-detected sources. All objects have multiwavelength coverage
including B to H HST bands, plus K band from Hawk-I, and 3.6 - 4.5
µm from Spitzer. Full and detailed treatment of photometric errors
is included. We perform basic sanity checks on the reliability of our
results. The multiwavelength catalogues are publicly available and are
ready to be used for scientific purposes. Our procedures allows for
the detection of outshined objects near the bright galaxies, which,
coupled with the magnification effect of the clusters, can reveal
extremely faint high redshift sources. Full analysis on photometric
redshifts is presented in a companion Paper II.
We present the first public release of photometric redshifts, galaxy
rest-frame properties and associated magnification values in the
cluster and parallel pointings of the first two Frontier Fields,
Abell-2744 and MACS-J0416. We exploit a multi-wavelength catalogue
ranging from HST to ground-based K and Spitzer IRAC which is
specifically designed to enable detection and measurement of accurate
fluxes in crowded cluster regions. The multi-band information is used
to derive photometric redshifts and physical properties of sources
detected either in the H-band image alone or from a stack of four WFC3
bands. To minimize systematics median photometric redshifts are
assembled from six different approaches to photo-z estimates. Their
reliability is assessed through a comparison with available
spectroscopic samples. State of the art lensing models are used to
derive magnification values on an object-by-object basis by taking
into account sources positions and redshifts. We show that photometric
redshifts reach a remarkable ∼3-5% accuracy. After accounting for
magnification the H band number counts are found in agreement at
bright magnitudes with number counts from the CANDELS fields, while
extending the presently available samples to galaxies intrinsically as
faint as H160∼32-33 thanks to strong gravitational lensing. The
Frontier Fields allow to probe the galaxy stellar mass distribution at
0.5-1.5dex lower masses, depending on magnification, with respect to
extragalactic wide fields, including sources at
Mstar∼107-108^M☉ at z>5. Similarly, they allow the detection
of objects with intrinsic SFRs>1dex lower than in the CANDELS fields
reaching 0.1-1M☉/yr at z∼6-10.
Description:
For Paper I:
The tables correspond to 4 distinct fields : Abell 2744 (cluster and
parallel field) and MCS J0416.1-2403 (cluster and parallel field). For
each field, there are three tables. Table A contains AB magnitudes.
Table B corresponding fluxes. Table C contains useful diagnostic data.
For Paper II:
The tables correspond to 4 distinct fields : Abell 2744 (cluster and
parallel field) and MCS J0416.1-2403 (cluster and parallel field).
Objects:
-------------------------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------------------------
00 14 20.03 -30 23 17.8 Abell 2744 = MCS J0014.3-3022
04 16 10.0 -24 03 58 MCS J0416.1-2403 = MCS J0416.1-2403
-------------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
a2744cla.dat 236 3587 Magnitudes for Abell 2744 cluster field
a2744clb.dat 231 3587 Fluxes for Abell 2744 cluster field
a2744clc.dat 105 3587 Diagnostics for Abell 2744 cluster field
a2744clz.dat 246 3572 Abell 2744 cluster field
a2744pfa.dat 236 3411 Magnitudes for Abell 2744 parallel field
a2744pfb.dat 231 3411 Fluxes for Abell 2744 parallel field
a2744pfc.dat 105 3411 Diagnostics for Abell 2744 parallel field
a2744pfz.dat 246 3411 Abell 2744 parallel field
m0416cla.dat 236 3408 Magnitudes for MCS J0416.1-2403 cluster field
m0416clb.dat 231 3408 Fluxes for MCS J0416.1-2403 cluster field
m0416clc.dat 105 3408 Diagnostics for MCS J0416.1-2403 cluster field
m0416clz.dat 246 3388 MCS J0416.1-2403 cluster field
m0416pfa.dat 236 3732 Magnitudes for MCS J0416.1-2403 parallel field
m0416pfb.dat 231 3732 Fluxes for MCS J0416.1-2403 parallel field
m0416pfc.dat 105 3732 Diagnostics for MCS J0416.1-2403 parallel field
m0416pfz.dat 246 3732 MCS J0416.1-2403 parallel field
--------------------------------------------------------------------------------
See also:
http://astrodeep.u-strasbg.fr/ff : Dedicated portal
http://www.astrodeep.eu/frontier-fields : ASTRODEEP website
Byte-by-byte Description of file: *a.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Source identifier (G1)
8- 16 F9.6 deg RAdeg Right ascension (J2000) (RA)
18- 27 F10.6 deg DEdeg Declination (J2000) (DEC)
29- 36 F8.3 pix Xpos ? Pixel x position in H160 image (X)
38- 45 F8.3 pix Ypos ? Pixel y position in H160 image (Y)
47 A1 --- l_B435 [-] - for upper limit
48- 54 F7.4 mag B435 [0/38]?=99 AB magnitude B435 (MAG_B435)
56 A1 --- l_V606 [-] - for upper limit
57- 63 F7.4 mag V606 [0/38]?=99 AB magnitude V606 (MAG_V606)
65 A1 --- l_I814 [-] - for upper limit
66- 72 F7.4 mag I814 [0/38]?=99 AB magnitude I814 (MAG_I814)
74 A1 --- l_Y105 [-] - for upper limit
75- 81 F7.4 mag Y105 [0/38]?=99 AB magnitude Y105 (MAG_Y105)
83 A1 --- l_J125 [-] - for upper limit
84- 90 F7.4 mag J125 [0/38]?=99 AB magnitude J125 (MAG_J125)
92 A1 --- l_JH140 [-] - for upper limit
93- 99 F7.4 mag JH140 [0/38]?=99 AB magnitude JH140 (MAG_JH140)
101 A1 --- l_H160 [-] - for upper limit
102-108 F7.4 mag H160 [0/38]?=99 AB magnitude H160 (MAG_H1600)
110 A1 --- l_Ks [-] - for upper limit
111-117 F7.4 mag Ks [0/38]?=99 AB magnitude Ks (MAG_Ks)
119 A1 --- l_IRAC1 [-] - for upper limit
120-126 F7.4 mag IRAC1 [0/38]?=99 AB magnitude IRAC CH1 (MAG_IRAC1)
128 A1 --- l_IRAC2 [-] - for upper limit
129-135 F7.4 mag IRAC2 [0/38]?=99 AB magnitude IRAC CH2 (MAG_IRAC2)
137-145 E9.6 mag e_B435 ?=99 Error on AB magnitude B435 (MAGERR_B435)
147-155 E9.6 mag e_V606 ?=99 Error on AB magnitude V606 (MAGERR_V606)
157-165 E9.6 mag e_I814 ?=99 Error on AB magnitude I814 (MAGERR_I814)
167-175 E9.6 mag e_Y105 ?=99 Error on AB magnitude Y105 (MAGERR_Y105)
177-185 E9.6 mag e_J125 ?=99 Error on AB magnitude J125 (MAGERR_J125)
187-195 E9.6 mag e_JH140 ?=99 Error on AB magnitude JH140 (MAGERR_JH140)
197-206 E10.6 mag e_H160 ?=99 Error on AB magnitude H160 (MAGERR_H160)
208-217 E10.6 mag e_Ks ?=99 Error on AB magnitude Ks (MAGERR_Ks)
219-226 F8.5 mag e_IRAC1 ?=99 Error on AB magnitude IRAC CH1 (MAGERR_IRAC1)
228-236 F9.6 mag e_IRAC2 ?=99 Error on AB magnitude IRAC CH2 (MAGERR_IRAC1)
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Byte-by-byte Description of file: *b.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Source identifier (G1)
8- 17 E10.6 uJy FB435 ?=0 B435 Flux (FLUX_B435)
19- 28 E10.6 uJy FV606 ?=0 V606 Flux (FLUX_V606)
30- 39 E10.6 uJy FI814 ?=0 I814 Flux (FLUX_I814)
41- 50 E10.6 uJy FY105 ?=0 Y105 Flux (FLUX_Y105)
52- 61 E10.6 uJy FJ125 ?=0 J125 Flux (FLUX_J125)
63- 72 E10.6 uJy FJH140 ?=0 JH140 Flux (FLUX_JH140)
74- 83 E10.6 uJy FH160 ?=0 H160 Flux (FLUX_H160)
85- 95 E11.6 uJy FKs ?=0 Ks Flux (FLUX_Ks)
97-107 E11.6 uJy FIRAC1 ?=0 IRAC CH1 Flux (FLUX_IRAC1)
109-119 E11.6 uJy FIRAC2 ?=0 IRAC CH2 Flux (FLUX_IRAC2)
121-130 E10.6 uJy e_FB435 ?=-99 Error on B435 Flux (FLUXERR_B435)
132-141 E10.6 uJy e_FV606 ?=-99 Error on V606 Flux (FLUXERR_V606)
143-152 E10.6 uJy e_FI814 ?=-99 Error on I814 Flux (FLUXERR_I814)
154-163 E10.6 uJy e_FY105 ?=-99 Error on Y105 Flux (FLUXERR_Y105)
165-174 E10.6 uJy e_FJ125 ?=-99 Error on J125 Flux (FLUXERR_J125)
176-185 E10.6 uJy e_FJH140 ?=-99 Error on JH140 Flux (FLUXERR_JH140)
187-196 E10.6 uJy e_FH160 ?=-99 Error on H160 Flux (FLUXERR_H160)
198-207 E10.6 uJy e_FKs ?=-99 Error on Ks Flux (FLUXERR_Ks)
209-219 E11.6 uJy e_FIRAC1 ?=-99 Error on IRAC CH1 Flux (FLUXERR_IRAC1)
221-231 E11.6 uJy e_FIRAC2 ?=-99 Error on IRAC CH2 Flux (FLUXERR_IRAC2)
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Byte-by-byte Description of file: *c.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Source identifier (G1)
8- 15 F8.3 pix Xpos ? Pixel x position in H160 image (X)
17- 24 F8.3 pix Ypos ? Pixel y position in H160 image (Y)
26- 29 I4 pix Xmin ? Segmentation x minimum value (XMIN)
31- 34 I4 pix Ymin ? Segmentation y minimum value (YMIN)
36- 39 I4 pix Xmax ? Segmentation x maximum value (XMAX)
41- 44 I4 pix Ymax ? Segmentation y maximum value (YMAX)
46- 50 F5.2 --- S/G [0/1]?=-1 SExtractor stellarity index
(CLASS_STAR)
52- 53 I2 --- fSeX ?=-1 SExtractor flag (SEXFLAG)
55- 60 I6 --- fRes ?=-1 flag applied to residual features
after processing the detection image(RESFLAG)
62- 63 I2 --- fVis [0/1]?=-1 Visual inspection flag (VISFLAG) (2)
65 I1 --- fKs [0/4]? T-PHOT flag for Ks band
(TPHOTFLAG_Ks) (3)
67- 77 E11.6 --- CovKs ? Covariance in Ks band (COVMAX_Ks) (4)
79 I1 --- fIRAC1 [0/4]? T-PHOT flag for IRAC1 band
(TPHOFLAG_IRAC1) (3)
81- 91 F11.6 --- covIRAC1 ? Covariance in IRAC1 band (COVMAX_IRAC1) (4)
93 I1 --- fIRAC2 [0/4]? T-PHOT flag for IRAC2 band
(TPHOTFLAG_IRAC2) (3)
95-105 F11.6 --- covIRAC2 ? Covariance in IRAC2 band
(COVMAX_IRAC2) (4)
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Note (2): A value 1 means probably spurious source.
Note (3): Flag used to identify saturated and blended priors.
Note (4): Ratio of maximum covariance to the variance.
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Byte-by-byte Description of file: *z.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Source identifier (ID) (G1)
8- 17 F10.6 --- zbest Median photo-z (ZBEST) (2)
19- 30 E12.6 --- e_zbest [0/5] Error on photometric redshift
(ZBEST_SIQR) (3)
32- 46 F15.11 --- Magnif Median magnification level (clusters) or
magnification from Merten model
(parallel fields) (MAGNIF)
48 I1 --- fzsp [0/1] Flag on redshift (ZSPECFLAG) (4)
54- 58 I5 --- zspID ?=-1 Spectroscopic counterpart (ZSPECID) (5)
60- 69 E10.7 --- Chi2 ?=0 Chi2 of the SED fitting (Chi2) (6)
71- 80 E10.6 10+9Msun M* ?=0 Stellar mass (MSTAR) (7)
82- 92 E11.6 10+9Msun bM* ?=0 Stellar mass min value (MSTAR_MIN) (7)
94-104 E11.6 10+9Msun BM* ?=0 Stellar mass max value (MSTAR_MAX) (7)
106-127 E22.6 Msun/yr SFR ?=0 Star Formation Rate (SFR) (8)
129-139 E11.6 Msun/yr bSFR ?=0 Star Formation Rate min value
(SFR_MIN) (8)
141-150 E10.6 Msun/yr BSFR ?=0 Star Formation Rate max value
(SFR_MAX) (8)
152-161 E10.7 --- chi2neb ?=0 Chi2 of the SED fitting (Chi2_NEB)
163-173 E11.6 10+9Msun M*neb ?=0 Stellar mass from stellar and nebular
fit (MSTAR_NEB)
175-189 E15.6 10+9Msun bM*neb ?=0 Stellar mass from stellar and nebular
fit min value (MSTARMINNEB)
191-205 E15.6 10+9Msun BM*neb ?=0 Stellar mass from stellar and nebular
fit max value (MSTARMAXNEB)
207-216 E10.6 Msun/yr SFRneb ?=0 Star Formation Rate from stellar and
nebular fits (SFR_NEB)
218-230 E13.6 Msun/yr bSFRneb ?=0 Star Formation Rate from stellar and
nebular fits min value (SFRMINNEB)
232-244 E13.6 Msun/yr BSFRneb ?=0 Star Formation Rate from stellar and
nebular fits max value (SFRMAXNEB)
246 I1 --- fRel [0/1]? Robustness flag (RELFLAG)
(SFRMAXNEB)(9)
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Note (2): reference (median) photo-z value, except when a match with a publicly
available high-quality spectroscopic source is found within 1 arcsec.
Sources for which the photo-z run did not converge to a solution are set
to ZBEST=-1.0.
Note (3): Error on photometric redshift set to 0 for spectroscopic sources
Note (4): Flag on redshift: 1 if spectroscopic, 0 otherwise
Note (5): identification number of spectroscopic counterpart from public
catalogues.
For Abell2744 the following convention is used:
- sources from Owers et al. (2011, Cat. J/ApJ/728/27) have ZSPECID equal
to the row index in the original file;
- sources from Johnson et al. (2014ApJ...797...48J 2014ApJ...797...48J) have ZSPECID equal
to 3000+row index from Table 2 in the paper,
- objects from the GLASS survey (Wang et al., 2015, Cat. J/ApJ/811/29)
have ZSPECID=10000+original ID.
For MACS0416 the following convention is used:
- sources from Ebeling, Ma Barrett, (2014, Cat. J/ApJS/211/21) have ZSPECID
equal to the original ID
- the strongly lensed galaxies made available by STSci for FF lensing
modeling (from Grillo et al. 2015ApJ...800...38G 2015ApJ...800...38G; Christensen et al.,
2012MNRAS.427.1953C 2012MNRAS.427.1953C) have ZSPECID=3000+row index from the original file
- objects from the GLASS survey (Treu et al., 2015, in prep.)
have ZSPECID=10000+original ID
Note (6): chi2 of the SED fitting with stellar only templates at redshift
fixed to ZBEST
Note (7): stellar mass in units of 109M☉_ (assuming Salpeter IMF) and
relevant uncertainty range. Uncertainties on physical parameters are defined
from the range where P(chi2)>32% estimated in a Δz=0.2 redshift bin
around the reference photometric redshift
Note (8): chi2 of the SED fitting with stellar plus nebular models at
redshift fixed to ZBEST.
Note (9): This flag is meant to provide a combined indication of the robustness
of photometric and photo-z estimates.
Sources with RELFLAG=1 have enough reliable photometric information for
estimating photometric redshifts. Instead, the value is=0 for sources
either: falling close to the border of the images; close to strong
residual features of the Galfit image pre-processing; found to be spurious
(mostly stellar spikes) from visual inspection; having SExtractor FLAG≥16;
having unphysical flux in the detection band; having less than 5 HST bands
with reliable flux measurement available for photo-z procedures.
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Global notes:
Note (G1): H-detected objects have IDs starting from 1;
IR-detected objects have IDs starting from 20000;
the bright cluster objects, modeled and subtracted from the HST images,
have IDs starting with 100000
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Acknowledgements:
Sebastien Derriere, sebastien.derriere(at)astro.unstra.fr
(End) Sebastien Derriere, Patricia Vannier [CDS] 08-Apr-2016