J/A+A/590/A102 VIPERS Multi-Lambda Survey (Moutard+, 2016)
The VIPERS Multi-Lambda Survey.
I. UV and NIR observations, multi-colour catalogues, and photometric redshifts.
Moutard T., Arnouts S., Ilbert O., Coupon J., Hudelot P., Vibert D.,
Comte V., Conseil S., Davidzon I., Guzzo L., Llebaria A., Martin C.,
McCracken H.J., Milliard B., Morrison G., Schiminovich D., Treyer M.,
Van Werbaeke L.
<Astron. Astrophys. 590, A102 (2016)>
=2016A&A...590A.102M 2016A&A...590A.102M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Galaxies, photometry ; Redshifts
Keywords: galaxies: photometry - galaxies: distances and redshifts -
galaxies: evolution
Abstract:
We present observations collected in the CFHTLS-VIPERS region in the
ultraviolet with the GALEX satellite (far- and near-ultraviolet
channels) and in the near-infrared with the CFHT/WIRCam camera (Ks
band) over an area of 22 and 27deg2, respectively. The depth of the
photometry was optimised to measure the physical properties (e.g.,
star formation rate, stellar masses) of all the galaxies in the VIPERS
spectroscopic survey. The large volume explored by VIPERS will enable
a unique investigation of the relationship between the galaxy
properties and their environment (density field and cosmic web) at
high redshift (0.5≤z≤1.2).
In this paper, we present the observations, the data reductions, and
the build-up of the multi-colour catalogues. The CFHTLS-T0007
(gri-χ2) images are used as reference to detect and measure the
Ks -band photometry, while the T0007 u*-selected sources are used as
priors to perform the GALEX photometry based on a dedicated software
(EMphot). Our final sample reaches NUVAB∼25 (at 5σ) and
KAB∼22 (at 3σ). The large spectroscopic sample (∼51,000
spectroscopic redshifts) allows us to highlight the robustness of our
star/galaxy separation and the reliability of our photometric
redshifts with a typical accuracy of {sigma]z≤0:04 and a fraction
of catastrophic failures η≤2% down to i∼23. We present various
tests on the Ks -band completeness and photometric redshift accuracy
by comparing our results with existing overlapping deep photometric
catalogues. Finally, we discuss the BzK sample of passive and active
galaxies at high redshift and the evolution of galaxy morphology in
the (NUV-r) vs (r-Ks) diagram at low redshift (z≤0.25) based on the
high image quality of the CFHTLS. The images, catalogues, and
photometric redshifts for 1.5 million sources (down to NUV≤25 ∪
Ks≤22) are released and available at this URL:
http://cesam.lam.fr/vipers-mls/.
Description:
The Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) is an
imaging survey performed with Mega-Cam in five optical bands u*, g, r,
i, z. we use the images and photometric catalogues of the W1 and W4
fields from the worldwide T00073 release produced by TERAPIX4.
Since 2010, we have conducted a Ks-band follow-up of the VIPERS fields
with the WIRCam instrument at CFHT. The original motivation was to
guarantee an almost complete detection in Ks band of the VIPERS
spectroscopic galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
vipmlsw1.dat 415 1728149 VIPERS-MLS-W1 master catalogue
vipmlsw4.dat 415 1244252 VIPERS-MLS-W4 master catalogue
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See also:
II/317 : The CFHTLS Survey (T0007 release) (Hudelot+ 2012)
J/A+A/562/A23 : VIMOS Public Extragalactic Survey (VIPERS) DR1 (Garilli+ 2014)
J/A+A/563/A92 : VIPERS: galaxy colours and luminosity function (Fritz+, 2014)
J/A+A/570/A106 : VIPERS. Searching for cosmic voids (Micheletti+, 2014)
Byte-by-byte Description of file: vipmlsw1.dat vipmlsw4.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- VIPERS-MLS Running number in the considered
CFHTLS field
9- 24 A16 --- TileT07 CFHTLS T0007 Tile
26- 36 F11.7 deg RAdeg Right ascension (J2000)
38- 48 F11.8 deg DEdeg Declination (J2000)
50- 56 F7.3 mag FUV ?=-99 GALEX FUV magnitude
(based on EMphot total flux)
58- 64 F7.3 mag NUV ?=-99 GALEX NUV magnitude
(based on EMphot total flux)
66- 72 F7.3 mag umag ?=-99 CFHTLS u magnitude (AB)
(TOTAL= ISO + delta_m)
74- 80 F7.3 mag gmag ?=-99 CFHTLS g magnitude (AB)
(TOTAL= ISO + delta_m)
82- 88 F7.3 mag rmag ?=-99 CFHTLS r magnitude (AB)
(TOTAL= ISO + delta_m)
90- 96 F7.3 mag imag ?=-99 CFHTLS i magnitude (AB)
(TOTAL= ISO + delta_m)
98-104 F7.3 mag ymag ?=-99 CFHTLS y magnitude (AB)
(TOTAL= ISO + delta_m)
106-112 F7.3 mag zmag ?=-99 CFHTLS z magnitude (AB)
(TOTAL= ISO + delta_m)
114-120 F7.3 mag Ksmag ?=-99 WIRCam Ks (2146nm) magnitude, AB
(TOTAL= ISO + delta_m)
122-146 F25.22 mag deltamag Weighted mean rescaling factor (from ISO
to AUTO pseudo-total fluxes) (delta_m)
148-157 F10.2 arcsec r2 Half-light radius (see T0007 doc.)
159-165 F7.4 mag/arcsec+2 mumaxi i-band maximum surface brightness
167 I1 --- flagpls [0/1] Point-Like Source (PLS) flag (1)
169 I1 --- flagfake [0/1] Potential fake object flag (2)
171-176 F6.2 --- zsec Redshift at the second significant PDF peak
178-183 F6.2 --- zqso Best Redshift for the QSO
185-188 I4 --- Classks Classification (3)
190-197 F8.4 --- zphot ?=-99 Most reliable photo-z based on
marginalized PDFz (Z_ML in LePhare)
199-207 F9.5 --- E_zphot ?=-99 zphot upper error (delimiting the 32%
of the PDFz above zphot)
209-216 F8.4 --- e_zphot ?=-99 zphot lower error (delimiting the 32%
of the PDFz below ZPHOT)
218 I1 --- mopt [0/1] CFHTLenS Masks (mask_opt) (4)
220 I1 --- mgalex [0/1] GALEX Masks (mask_galex) (4)
222 I1 --- lfuv [0/1] FUV observed region (layout_fuv) (5)
224 I1 --- lnuv [0/1] NUV observed region (layout_nuv) (5)
226 I1 --- lks [0/1] WIRCam observed region
(layout_ks) (5)
228-235 F8.4 mag e_FUV ?=-99 rms uncertainty on FUV
237-246 F10.4 mag e_NUV ?=-99 rms uncertainty on FUV
248-257 F10.4 mag e_umag ?=-99 rms uncertainty on umag
259-267 F9.4 mag e_gmag ?=-99 rms uncertainty on gamg
269-277 F9.4 mag e_rmag ?=-99 rms uncertainty on rmag
279-286 F8.4 mag e_imag ?=-99 rms uncertainty on imag
288-296 F9.4 mag e_ymag ?=-99 rms uncertainty on ymag
298-304 F7.3 mag i+ymag ?=-99 CFHTLS combined i-bands
(i.e. i and y)
306-314 F9.4 mag e_i+ymag ?=-99 rms uncertainty on i+ymag
316-325 F10.4 mag e_zmag ?=-99 rms uncertainty on zmag
327-336 F10.4 mag e_Ksmag ?=-99 rms uncertainty on Ksmag
338-342 F5.1 --- Context Selected bands for SED fitting
(LePhare definition)
344 I1 --- Nband [1/8] Number of bands used in the SED
fitting
346-357 F12.6 --- chibest ?=99999 Minimum Chi-square for the galaxy
template library
359-362 I4 --- modbest ?=-999 Best model from the galaxy
template library
364-371 F8.4 --- zbest ?=-99 Redshift at minimum
chi-square/maximum PDF(z)
373-379 F7.3 --- pdzbest Integrated PDF(z) in between
zbest±0.1(1+z): sharpness of the PDF
381-392 F12.6 --- chistar ?=99999 Minimum Chi-square for the STAR
template library
394-397 I4 --- modstar ?=-999 Best model from the STAR
template library
399-410 F12.6 --- chiqso ?=99999 Minimum Chi-square for the QSO
template library
412-415 I4 --- modqso ?=-999 Best model from the QSO
template library
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Note (1): Point-Like Source (PLS) flag as follows:
0 = Extended
1 = Point-like source in at least two detection bands OR saturated
Note (2): Potential fake object flag as follows:
0 = Good object
1 = Fake object
Note (3): Classification:
GALAXY [0-9] / STAR [10-19] / QSO [20-29]
Note (4): CFHTLenS and GALEX masks codes as follows:
0 = Outside (good object)
1 = Inside (bad object)
Note (5): Layout flags as follows:
0 = Inside (good object)
1 = Outside (bad object)
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History:
Copied at http://cesam.lam.fr/vipers-mls/
(End) Patricia Vannier [CDS] 20-May-2016