Photometric redshifts for the CFHTLS-Wide
We want to derive bias free, accurate photometric redshifts for those fields of the CFHTLS-Wide data which are covered in the u*, g', r', i' and z' filters and are public on January 2008. These are 37 square degrees in the W1, W3 and W4 fields with photometric data for a total of...
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| creator | Brimioulle, Fabrice Lerchster, Michael Seitz, Stella Bender, Ralf Snigula, Jan |
| description | We want to derive bias free, accurate photometric redshifts for those fields
of the CFHTLS-Wide data which are covered in the u*, g', r', i' and z' filters
and are public on January 2008. These are 37 square degrees in the W1, W3 and
W4 fields with photometric data for a total of 2.597.239 galaxies. We use the
photometric redshift code PHOTO-z of Bender et al. (2001). We compare our
redshifts for the W1, W3 and W4 fields to about 7500 spectroscopic redshifts
from the VVDS therein. For galaxies with 17.5 |
| doi_str_mv | 10.48550/arxiv.0811.3211 |
| format | Article |
| fullrecord | <record><control><sourceid>arxiv_GOX</sourceid><recordid>TN_cdi_arxiv_primary_0811_3211</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>0811_3211</sourcerecordid><originalsourceid>FETCH-LOGICAL-a651-97eca16830f006140cb1a60045917e87e2e0b550bb12e98f92b4c3327427f01b3</originalsourceid><addsrcrecordid>eNotzrGLwjAUgPEsDoe63yRdHVrfS9ImHY9iVSjcgQXHktQXGrBU0nLof6_eOX3bx4-xT4RE6jSFjQk3_5uARkwER_xg659umIaepuDbKNB57LybxsgNIZo6iopyX1fH-OTPtGAzZy4jLd-ds7rc1sU-rr53h-Krik2WYpwrag1mWoADyFBCa9FkADLNUZFWxAnsU2Itcsq1y7mVrRBcSa4coBVztvrf_lGba_C9CffmRW5eZPEAGOg5AA</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Photometric redshifts for the CFHTLS-Wide</title><source>arXiv.org</source><creator>Brimioulle, Fabrice ; Lerchster, Michael ; Seitz, Stella ; Bender, Ralf ; Snigula, Jan</creator><creatorcontrib>Brimioulle, Fabrice ; Lerchster, Michael ; Seitz, Stella ; Bender, Ralf ; Snigula, Jan</creatorcontrib><description>We want to derive bias free, accurate photometric redshifts for those fields
of the CFHTLS-Wide data which are covered in the u*, g', r', i' and z' filters
and are public on January 2008. These are 37 square degrees in the W1, W3 and
W4 fields with photometric data for a total of 2.597.239 galaxies. We use the
photometric redshift code PHOTO-z of Bender et al. (2001). We compare our
redshifts for the W1, W3 and W4 fields to about 7500 spectroscopic redshifts
from the VVDS therein. For galaxies with 17.5 <= i' AB <= 22.5 the accuracies
and outlier rates become sigma=0.033, eta~2 % for W1, sigma=0.037, eta~2% for
W3 and sigma=0.035, eta~2.5 % outliers for W4 fields. For the total galaxy
sample with about 9000 spectroscopic redshifts from VVDS, DEEP2 or SDSS we
obtain a sigma=0.04 and eta~5.7% for the PHOTO-z redshifts. We consider the
photometric redshifts of Erben et al. (2008) which were obtained with exactly
the same photometric catalog using the BPZ-redshift code and compare them with
our computed redshifts. We also merge the subsample with good photometric
redshifts from PHOTO-z with that one from BPZ to obtain a sample which then
contains 'secure' redshifts according to both the PHOTO-z and the BPZ codes.
This sample contains about 6100 spectra and the photometric redshift qualities
become sigma=0.037 and eta~1.0% for our PHOTO-z redshifts. We conclude that
this work provides a bias free, low dispersion photometric redshift catalog,
that we have criteria at hand to select a 'robust' subsample with fewer
outliers. Such a subsample is very useful to study the redshift dependent
growth of the dark matter fluctuations with weak lensing cosmic shear analyses
or to investigate the redshift dependent weak lensing signal behind clusters of
galaxies in the framework of dark energy equation of state constraints.</description><identifier>DOI: 10.48550/arxiv.0811.3211</identifier><language>eng</language><subject>Physics - Astrophysics of Galaxies ; Physics - Cosmology and Nongalactic Astrophysics ; Physics - Earth and Planetary Astrophysics ; Physics - High Energy Astrophysical Phenomena ; Physics - Instrumentation and Methods for Astrophysics ; Physics - Solar and Stellar Astrophysics</subject><creationdate>2008-11</creationdate><rights>http://arxiv.org/licenses/nonexclusive-distrib/1.0</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,780,885</link.rule.ids><linktorsrc>$$Uhttps://arxiv.org/abs/0811.3211$$EView_record_in_Cornell_University$$FView_record_in_$$GCornell_University$$Hfree_for_read</linktorsrc><backlink>$$Uhttps://doi.org/10.48550/arXiv.0811.3211$$DView paper in arXiv$$Hfree_for_read</backlink></links><search><creatorcontrib>Brimioulle, Fabrice</creatorcontrib><creatorcontrib>Lerchster, Michael</creatorcontrib><creatorcontrib>Seitz, Stella</creatorcontrib><creatorcontrib>Bender, Ralf</creatorcontrib><creatorcontrib>Snigula, Jan</creatorcontrib><title>Photometric redshifts for the CFHTLS-Wide</title><description>We want to derive bias free, accurate photometric redshifts for those fields
of the CFHTLS-Wide data which are covered in the u*, g', r', i' and z' filters
and are public on January 2008. These are 37 square degrees in the W1, W3 and
W4 fields with photometric data for a total of 2.597.239 galaxies. We use the
photometric redshift code PHOTO-z of Bender et al. (2001). We compare our
redshifts for the W1, W3 and W4 fields to about 7500 spectroscopic redshifts
from the VVDS therein. For galaxies with 17.5 <= i' AB <= 22.5 the accuracies
and outlier rates become sigma=0.033, eta~2 % for W1, sigma=0.037, eta~2% for
W3 and sigma=0.035, eta~2.5 % outliers for W4 fields. For the total galaxy
sample with about 9000 spectroscopic redshifts from VVDS, DEEP2 or SDSS we
obtain a sigma=0.04 and eta~5.7% for the PHOTO-z redshifts. We consider the
photometric redshifts of Erben et al. (2008) which were obtained with exactly
the same photometric catalog using the BPZ-redshift code and compare them with
our computed redshifts. We also merge the subsample with good photometric
redshifts from PHOTO-z with that one from BPZ to obtain a sample which then
contains 'secure' redshifts according to both the PHOTO-z and the BPZ codes.
This sample contains about 6100 spectra and the photometric redshift qualities
become sigma=0.037 and eta~1.0% for our PHOTO-z redshifts. We conclude that
this work provides a bias free, low dispersion photometric redshift catalog,
that we have criteria at hand to select a 'robust' subsample with fewer
outliers. Such a subsample is very useful to study the redshift dependent
growth of the dark matter fluctuations with weak lensing cosmic shear analyses
or to investigate the redshift dependent weak lensing signal behind clusters of
galaxies in the framework of dark energy equation of state constraints.</description><subject>Physics - Astrophysics of Galaxies</subject><subject>Physics - Cosmology and Nongalactic Astrophysics</subject><subject>Physics - Earth and Planetary Astrophysics</subject><subject>Physics - High Energy Astrophysical Phenomena</subject><subject>Physics - Instrumentation and Methods for Astrophysics</subject><subject>Physics - Solar and Stellar Astrophysics</subject><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><sourceid>GOX</sourceid><recordid>eNotzrGLwjAUgPEsDoe63yRdHVrfS9ImHY9iVSjcgQXHktQXGrBU0nLof6_eOX3bx4-xT4RE6jSFjQk3_5uARkwER_xg659umIaepuDbKNB57LybxsgNIZo6iopyX1fH-OTPtGAzZy4jLd-ds7rc1sU-rr53h-Krik2WYpwrag1mWoADyFBCa9FkADLNUZFWxAnsU2Itcsq1y7mVrRBcSa4coBVztvrf_lGba_C9CffmRW5eZPEAGOg5AA</recordid><startdate>20081119</startdate><enddate>20081119</enddate><creator>Brimioulle, Fabrice</creator><creator>Lerchster, Michael</creator><creator>Seitz, Stella</creator><creator>Bender, Ralf</creator><creator>Snigula, Jan</creator><scope>GOX</scope></search><sort><creationdate>20081119</creationdate><title>Photometric redshifts for the CFHTLS-Wide</title><author>Brimioulle, Fabrice ; Lerchster, Michael ; Seitz, Stella ; Bender, Ralf ; Snigula, Jan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a651-97eca16830f006140cb1a60045917e87e2e0b550bb12e98f92b4c3327427f01b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Physics - Astrophysics of Galaxies</topic><topic>Physics - Cosmology and Nongalactic Astrophysics</topic><topic>Physics - Earth and Planetary Astrophysics</topic><topic>Physics - High Energy Astrophysical Phenomena</topic><topic>Physics - Instrumentation and Methods for Astrophysics</topic><topic>Physics - Solar and Stellar Astrophysics</topic><toplevel>online_resources</toplevel><creatorcontrib>Brimioulle, Fabrice</creatorcontrib><creatorcontrib>Lerchster, Michael</creatorcontrib><creatorcontrib>Seitz, Stella</creatorcontrib><creatorcontrib>Bender, Ralf</creatorcontrib><creatorcontrib>Snigula, Jan</creatorcontrib><collection>arXiv.org</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Brimioulle, Fabrice</au><au>Lerchster, Michael</au><au>Seitz, Stella</au><au>Bender, Ralf</au><au>Snigula, Jan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Photometric redshifts for the CFHTLS-Wide</atitle><date>2008-11-19</date><risdate>2008</risdate><abstract>We want to derive bias free, accurate photometric redshifts for those fields
of the CFHTLS-Wide data which are covered in the u*, g', r', i' and z' filters
and are public on January 2008. These are 37 square degrees in the W1, W3 and
W4 fields with photometric data for a total of 2.597.239 galaxies. We use the
photometric redshift code PHOTO-z of Bender et al. (2001). We compare our
redshifts for the W1, W3 and W4 fields to about 7500 spectroscopic redshifts
from the VVDS therein. For galaxies with 17.5 <= i' AB <= 22.5 the accuracies
and outlier rates become sigma=0.033, eta~2 % for W1, sigma=0.037, eta~2% for
W3 and sigma=0.035, eta~2.5 % outliers for W4 fields. For the total galaxy
sample with about 9000 spectroscopic redshifts from VVDS, DEEP2 or SDSS we
obtain a sigma=0.04 and eta~5.7% for the PHOTO-z redshifts. We consider the
photometric redshifts of Erben et al. (2008) which were obtained with exactly
the same photometric catalog using the BPZ-redshift code and compare them with
our computed redshifts. We also merge the subsample with good photometric
redshifts from PHOTO-z with that one from BPZ to obtain a sample which then
contains 'secure' redshifts according to both the PHOTO-z and the BPZ codes.
This sample contains about 6100 spectra and the photometric redshift qualities
become sigma=0.037 and eta~1.0% for our PHOTO-z redshifts. We conclude that
this work provides a bias free, low dispersion photometric redshift catalog,
that we have criteria at hand to select a 'robust' subsample with fewer
outliers. Such a subsample is very useful to study the redshift dependent
growth of the dark matter fluctuations with weak lensing cosmic shear analyses
or to investigate the redshift dependent weak lensing signal behind clusters of
galaxies in the framework of dark energy equation of state constraints.</abstract><doi>10.48550/arxiv.0811.3211</doi><oa>free_for_read</oa></addata></record> |
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| identifier | DOI: 10.48550/arxiv.0811.3211 |
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| subjects | Physics - Astrophysics of Galaxies Physics - Cosmology and Nongalactic Astrophysics Physics - Earth and Planetary Astrophysics Physics - High Energy Astrophysical Phenomena Physics - Instrumentation and Methods for Astrophysics Physics - Solar and Stellar Astrophysics |
| title | Photometric redshifts for the CFHTLS-Wide |
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