J/A+A/632/A34 KiDS+VIKING-450 opt+NIR dataset (Wright+, 2019)
KiDS+VIKING-450: A new combined optical and near-IR dataset for cosmology and
astrophysics.
Wright A.H., Hildebrandt H., Kuijken K., Erben T., Blake R.,
Buddelmeijer H., Choi A., Cross N., de Jong J.T.A., Edge A.,
Gonzalez-Fernandez C., Gonzalez Solares E., Grado A., Heymans C., Irwin M.,
Kupcu Yoldas A., Lewis J.R., Mann R.G., Napolitano N., Radovich, M..,
Schneider P., Sifon C., Sutherland W., Sutorius E., Verdoes Kleijn G.A.
<Astron. Astrophys. 632, A34 (2019)>
=2019A&A...632A..34W 2019A&A...632A..34W (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Photometry, infrared ; Optical ; Stars, masses
Keywords: cosmology: observations - gravitational lensing: weak -
galaxies: photometry - surveys
Abstract:
We present the curation and verification of a new combined optical and
near infrared dataset for cosmology and astrophysics, derived by
combining ugri-band imaging from the Kilo-Degree Survey (KiDS) and
ZYJHKs-band imaging from the VISTA Kilo degree Infrared Galaxy
(VIKING) survey. This dataset is unrivaled in cosmological imaging
surveys due to the combination of its area (458 deg2 before masking),
depth (r≤25), and wavelength coverage (ugriZYJHKs). This
combination of survey depth, area, and (most importantly) wavelength
coverage allows significant reductions in systematic uncertainties
(i.e. reductions of between 10% and 60% in bias, outlier rate, and
scatter) in photometric-to-spectroscopic redshift comparisons,
compared to the optical-only case at photo-z above 0.7. The
complementarity between our optical and near infrared surveys means
that over 80% of our sources, across all photo-z, have significant
detections (i.e. not upper limits) in our eight reddest bands. We have
derived photometry, photo-z, and stellar masses for all sources in the
survey, and verified these data products against existing
spectroscopic galaxy samples. We demonstrate the fidelity of our
higher-level data products by constructing the survey stellar mass
functions in eight volume-complete redshift bins. We find that these
photometrically derived mass functions provide excellent agreement
with previous mass evolution studies derived using spectroscopic
surveys. The primary data products presented in this paper are made
publicly available through the KiDS survey website.
Description:
Stellar mass estimates for KiDS+VIKING-450 sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 105 49275030 LePhare MASS_BEST values for KiDS+VIKING-450 sources
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See also:
II/343 : VIKING catalogue data release 2 (Edge+, 2016)
II/344 : KiDS-ESO-DR2 multi-band source catalog (de Jong+, 2015)
II/347 : KiDS-ESO-DR3 multi-band source catalog (de Jong+, 2017)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Pointing KiDS Tile name in THELI convention (Pointing)
18- 23 I6 --- Seq Per-pointing Object ID (SeqNr)
25- 39 E15.10 deg RAdeg Sky Position Right Ascention (J2000)
(ALPHA_J2000)
41- 56 E16.10 deg DEdeg Sky Position Declination (J2000) (DELTA_J2000)
58- 62 I5 --- Mask Masking bit-flag (MASK) (1)
64- 78 F15.9 pix FrTheli THELI flux radius (FLUXRADIUSTHELI)
80- 83 F4.2 --- zph BPZ maximum likelihood photo-z (Z_B)
85- 93 F9.5 [Msun] MassMed ?=-99 Posterior Median galaxy stellar mass
(MASS_MED)
95-103 F9.5 [Msun] MassBest ?=-99 Best-fit galaxy stellar mass (MASS_BEST)
105 I1 --- LSGFlag [0/1] Star-Galaxy flag (LSGFlag) (2)
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Note (1): MASK has the following bit-values. Generally MASK ≤ 4 is the
recommended selection to apply for science.
MASK bits:
[value (bit)]: description
1(0): manualmaskaggressive (THELI det.band)
2(1): starhalolarge_faint
(THELI det.band; cyan, 10.5<m_r<11.5 of UCAC4 and GSC1 stellar
catalog)
4(2): starhalolarge (THELI det.band; magenta, m_r<10.5 of UCAC4 and
GSC1) + stellar_mask (THELI det.band; green, m_r<14.0 of
UCAC4 and GSC1)
8(3): Currently empty - will be used in DR4 for manual masks
16(4): weight≡0 mask (THELI det.band; masking due to saturation, chip gap,
etc) + void mask (THELI det.band; green) and asteroids (THELI
det.band; red)
32(5): empty
64(6): empty
128(7): empty
256(8): empty
512(9): empty
1024(10): AW halo+stellar mask (AW u mask regions)
+ weight≡0 mask (u masking due to saturation, chip gap, etc)
2048(11): AW halo+stellar mask (AW g mask regions)
+ weight≡0 mask (g masking due to saturation, chip gap, etc)
4096(12): AW halo+stellar mask (AW r mask regions)
+ weight≡0 mask (r masking due to saturation, chip gap, etc)
8192(13): AW halo+stellar mask (AW i mask regions)
+ weight≡0 mask (i masking due to saturation, chip gap, etc)
16384(14): outside the WCS RA/DEC cut (trimming)
32768(15): NA [Reserved by signed 2-byte integer]
Note (2): Star-Galaxy flag determined by combination of LePhare best-fitting
template and r-band flux radius as follows:
1 = star
0 = galaxy
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Acknowledgements:
Angus Wright, awright(at)astro.rub.de
(End) Patricia Vannier [CDS] 19-Nov-2019