TY - JOUR
T1 - The ASTRODEEP Frontier Fields catalogues. II. Photometric redshifts and rest frame properties in Abell-2744 and MACS-J0416
AU - Castellano, M.
AU - Amorín, R.
AU - Merlin, E.
AU - Fontana, A.
AU - McLure, R. J.
AU - Mármol-Queraltó, E.
AU - Mortlock, A.
AU - Parsa, S.
AU - Dunlop, J. S.
AU - Elbaz, D.
AU - Balestra, I.
AU - Boucaud, A.
AU - Bourne, N.
AU - Boutsia, K.
AU - Brammer, G.
AU - Buitrago, F.
AU - Capak, P.
AU - Cappelluti, N.
AU - Ciesla, L.
AU - Comastri, A.
AU - Cullen, F.
AU - Derriere, S.
AU - Faber, S. M.
AU - Giallongo, E.
AU - Grazian, A.
AU - Grillo, C.
AU - Mercurio, A.
AU - Michałowski, M. J.
AU - Nonino, M.
AU - Paris, D.
AU - Pentericci, L.
AU - Pilo, S.
AU - Rosati, P.
AU - Santini, P.
AU - Schreiber, C.
AU - Shu, X.
PY - 2016/5/1
Y1 - 2016/5/1
N2 - Aims: 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. The released catalogues aim to
provide a reference for future investigations of extragalactic
populations in these legacy fields: from lensed high-redshift galaxies
to cluster members themselves. Methods: We exploit a
multiwavelength catalogue, ranging from Hubble Space Telescope (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 multiband 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. Results: We show that photometric redshifts reach
a remarkable ~3-5% accuracy. After accounting for magnification, the
H-band number counts are found to be in agreement at bright magnitudes
with number counts from the CANDELS fields, while extending the
presently available samples to galaxies that, intrinsically, are as
faint as H ~ 32-33, thanks to strong gravitational lensing. The Frontier
Fields allow the galaxy stellar mass distribution to be probed,
depending on magnification, at 0.5-1.5 dex lower masses 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 star formation rates
(SFRs) >1 dex lower than in the CANDELS fields reaching 0.1-1
M⊙/yr at z ~ 6-10.
The catalogues, together with the final processed images for all HST
bands (as well as some diagnostic data and images), are publicly
available and can be downloaded from the Astrodeep website at http://www.astrodeep.eu/frontier-fields/
and from a dedicated CDS webpage (http://astrodeep.u-strasbg.fr/ff/index.html).
The catalogues are also available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/590/A31
AB - Aims: 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. The released catalogues aim to
provide a reference for future investigations of extragalactic
populations in these legacy fields: from lensed high-redshift galaxies
to cluster members themselves. Methods: We exploit a
multiwavelength catalogue, ranging from Hubble Space Telescope (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 multiband 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. Results: We show that photometric redshifts reach
a remarkable ~3-5% accuracy. After accounting for magnification, the
H-band number counts are found to be in agreement at bright magnitudes
with number counts from the CANDELS fields, while extending the
presently available samples to galaxies that, intrinsically, are as
faint as H ~ 32-33, thanks to strong gravitational lensing. The Frontier
Fields allow the galaxy stellar mass distribution to be probed,
depending on magnification, at 0.5-1.5 dex lower masses 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 star formation rates
(SFRs) >1 dex lower than in the CANDELS fields reaching 0.1-1
M⊙/yr at z ~ 6-10.
The catalogues, together with the final processed images for all HST
bands (as well as some diagnostic data and images), are publicly
available and can be downloaded from the Astrodeep website at http://www.astrodeep.eu/frontier-fields/
and from a dedicated CDS webpage (http://astrodeep.u-strasbg.fr/ff/index.html).
The catalogues are also available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/590/A31
KW - catalogs
KW - galaxies: high-redshift
KW - methods: data analysis
KW - galaxies: distances and redshifts
U2 - 10.1051/0004-6361/201527514
DO - 10.1051/0004-6361/201527514
M3 - Article
SN - 0004-6361
VL - 590
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
M1 - A31
ER -