J/MNRAS/465/1831 SDSS-IV eBOSS ELG UgrizW photometry (Delubac+, 2017)
The SDSS-IV eBOSS: emission line galaxy catalogues at z ~= 0.8 and study of
systematic errors in the angular clustering.
Delubac T., Raichoor A., Comparat J., Jouvel S., Kneib J.-P., Yeche C.,
Zou H., Brownstein J.R., Abdalla F.B., Dawson K., Jullo E., Myers A.D.,
Newman J.A., Percival W.J., Prada F., Ross A.J., Schneider D.P., Zhou X.,
Zhou Z., Zhu G.
<Mon. Not. R. Astron. Soc., 465, 1831-1846 (2017)>
=2017MNRAS.465.1831D 2017MNRAS.465.1831D (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; Photometry, SDSS ;
Photometry, infrared
Keywords: methods: data analysis - catalogues; galaxies -
distances and redshifts - galaxies: general - galaxies: photometry -
cosmology: observations
Abstract:
We present two wide-field catalogues of photometrically selected
emission line galaxies (ELGs) at z~=0.8 covering about 2800deg2 over
the south galactic cap. The catalogues were obtained using a Fisher
discriminant technique described in a companion paper. The two
catalogues differ by the imaging used to define the Fisher
discriminant: the first catalogue includes imaging from the Sloan
Digital Sky Survey and the Wide-field InfraredSurvey Explorer, the
second also includes information from the South Galactic Cap U-band
Sky Survey. Containing respectively 560045 and 615601 objects, they
represent the largest ELG catalogues available today and were designed
for the ELG programme of the extended Baryon Oscillation Spectroscopic
Survey (eBOSS). We study potential sources of systematic variation in
the angular distribution of the selected ELGs due to fluctuations of
the observational parameters. We model the influence of the
observational parameters using a multivariate regression and implement
a weighting scheme which allows effective removal of all of the
systematic errors induced by the observational parameters. We show
that fluctuations in the imaging zero-points of the photometric bands
have minor impact on the angular distribution of objects in our
catalogues. We compute the angular clustering of both catalogues and
show that our weighting procedure effectively removes spurious
clustering on large scales. We fit a model to the small-scale angular
clustering, showing that the selections have similar biases of
1.35/Da(z) and 1.28/Da(z). Both catalogues are publicly available.
Description:
The UgrizW and griW selections both use combined information from
different photometric catalogues. The griW selection uses SDSS g, r
and i bands as well as WISE infrared W1 information, while the UgrizW
also includes SDSS z band as well as SCUSS U band. This section
introduces the different photometric catalogues used as well as the
algorithms defining the selections
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
griw.dat 221 2000795 eBOSS ELG griW catalog
ugriw.dat 221 615601 eBOSS ELG UgriW catalog
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See also:
J/A+A/592/A121 : SDSS-IV eBOSS emission-line galaxy pilot survey
(Comparat+, 2016)
Byte-by-byte Description of file: griw.dat ugriw.dat
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Bytes Format Units Label Explanations
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1- 20 I20 --- objID SDSS objID
22- 31 F10.6 deg RAdeg Right ascension (J2000)
33- 42 F10.6 deg DEdeg Declination (J2000)
44- 50 F7.4 mag Umag ?=0 SCUSS U magnitude (SCUSS_modeladd)
52- 61 F10.4 mag umag ?=-9999 SDSS u magnitude (modelmag_u)
63- 69 F7.4 mag gmag SDSS g magnitude (modelmag_g)
71- 77 F7.4 mag rmag SDSS r magnitude (modelmag_r)
79- 85 F7.4 mag imag SDSS i magnitude (modelmag_i)
87- 93 F7.4 mag zmag SDSS z magnitude (modelmag_z)
95-101 F7.4 mag W1mag WISE W1 magnitude
103-109 F7.4 mag e_Umag ?=0 rms uncertainty on Umag
111-120 F10.4 mag e_umag ?=-9999 rms uncertainty on umag
122-127 F6.4 mag e_gmag rms uncertainty on gmag
129-134 F6.4 mag e_rmag rms uncertainty on rmag
136-141 F6.4 mag e_imag rms uncertainty on imag
143-149 F7.4 mag e_zmag rms uncertainty on zmag
151-156 F6.4 mag e_W1mag rms uncertainty on W1mag
158-165 F8.6 mag Extu Extinction in u band
167-174 F8.6 mag Extg Extinction in g band
176-183 F8.6 mag Extr Extinction in r band
185-192 F8.6 mag Exti Extinction in i band
194-201 F8.6 mag Extz Extinction in z band
203-210 F8.6 mag ExtW1 Extinction in W1 band
212-219 F8.6 --- Weight Weight
221 I1 --- Mask [0/1] Mask
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History:
Copied at https://data.sdss.org/sas/dr13/eboss/target/elg/fisher-selection
(End) Patricia Vannier [CDS] 04-Sep-2018