J/ApJS/183/295 A K-selected catalog of the ECDFS from MUSYC (Taylor+, 2009)
A public, K-selected, optical-to-near-infrared catalog of the Extended Chandra
Deep Field South (ECDFS) from the Multiwavelength Survey by Yale-Chile (MUSYC).
Taylor E.N., Franx M., Van Dokkum P.G., Quadri R.F., Gawiser E., Bell E.F.,
Barrientos L.F., Blanc G.A., Castander F.J., Damen M., Gonzalez-Perez V.,
Hall P.B., Herrera D., Hildebrandt H., Kriek M., Labbe I., Lira P.,
Maza J., Rudnick G., Treister E., Urry C.M., Willis J.P., Wuyts S.
<Astrophys. J. Suppl. Ser., 183, 295-319 (2009)>
=2009ApJS..183..295T 2009ApJS..183..295T
ADC_Keywords: Surveys ; Photometry, infrared ; Redshifts ; Photometry, UBVRI
Keywords: catalogs - galaxies: distances and redshifts - surveys
galaxies: fundamental parameters - galaxies: high-redshift
galaxies: photometry
Abstract:
We present a new, K-selected, optical-to-near infrared photometric
catalog of the Extended Chandra Deep Field South (ECDFS), making it
publicly available to the astronomical community. The data set is
founded on publicly available imaging, supplemented by original z'JK
imaging data collected as part of the MUltiwavelength Survey by
Yale-Chile (MUSYC). The final photometric catalog consists of
photometry derived from UU38BVRIz'JK imaging covering the full
1/2x1/2° of the ECDFS, plus H-band photometry for approximately
80% of the field. The 5σ flux limit for point sources is
K(AB)tot=22.0. This is also the nominal completeness and
reliability limit of the catalog: the empirical completeness for
21.75<K<22.00 is ≳85%. We have verified the quality of the catalog
through both internal consistency checks, and comparisons to other
existing and publicly available catalogs. As well as the photometric
catalog, we also present catalogs of photometric redshifts and
rest-frame photometry derived from the 10-band photometry. We have
collected robust spectroscopic redshift determinations from published
sources for 1966 galaxies in the catalog. Based on these sources, we
have achieved a (1σ) photometric redshift accuracy of
Δz/(1+z)=0.036, with an outlier fraction of 7.8%. Most of these
outliers are X-ray sources. Finally, we describe and release a utility
for interpolating rest-frame photometry from observed spectral energy
distributions, dubbed InterRest available via
http://www.strw.leidenuniv.nl/~ent/InterRest
Description:
Hildebrandt et al. (2006A&A...452.1121H 2006A&A...452.1121H) have collected all (up until
2005 December) archival UU38BRVI imaging data taken using the Wide
Field Imager (WFI) on the ESO MPG 2.2m telescope. We have supplemented
the WFI optical data with original z'-band imaging taken using
Mosaic-II camera on the CTIO 4m Blanco telescope. The ECDFS data were
taken in 2005 January. The new MUSYC NIR imaging consists of two
mosaics in the J and K bands obtained using the Infrared Sideport
Imager (ISPI) on the CTIO Blanco 4m telescope. The data were taken
over the course of 15 nights, in 4 separate observing runs between
2003 January and 2004 February.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
photcat.dat 514 16910 Photometric catalog, V3.0
zphot.dat 134 16910 Photometric redshift catalog, V3.0
restfr.dat 292 16910 Rest-frame photometry catalog, V3.0
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See also:
J/MNRAS/328/150 : KX redshift survey (Croom+, 2001)
J/A+A/392/395 : Ks-band magnitudes of the K20 sample (Cimatti+, 2002)
J/ApJS/155/271 : Chandra Deep Field-South: Optical spectros. (Szokoly+ 2004)
J/A+A/428/1043 : Redshifts from VIMOS VLT Deep Survey (Le Fevre+, 2004)
J/A+A/437/883 : K20 survey: spectroscopic catalogue (Mignoli+, 2005)
J/A+A/434/53 : GOODS-South Field redshifts (Vanzella+, 2005)
J/AJ/131/2373 : Extended Chandra Deep Field-South survey (Virani+, 2006)
J/ApJS/162/1 : MUSYC: optical source catalog (Gawiser+, 2006)
J/AJ/134/1103 : MUSYC deep near-infrared imaging (Quadri+, 2007)
J/A+A/465/1099 : Redshift catalog of 691 objects in CDFS (Ravikumar+, 2007)
http://www.astro.yale.edu/MUSYC : MUSYC Public Data Release webpage
Byte-by-byte Description of file: photcat.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq [1,16910]+ Object identifier number
7- 16 F10.7 deg RAdeg [52.8547,53.432] Right ascension in degrees
(J2000)
18- 28 F11.7 deg DEdeg [-28.0668,-27.5507] Declination in degrees
(J2000)
30 I1 --- Field [8] Internal MUSYC field identifier (ECDFS=8)
32- 39 F8.3 pix Xpix X center of light position
41- 48 F8.3 pix Ypix Y center of light position
50- 54 F5.2 arcsec diam1 [2.5,78.23] Effective diameter (1)
56- 67 E12.6 0.363mJy FU [-0.384,32365.4] Observed flux in U-band (2)
69- 77 E9.4 0.363mJy e_FU [0.04957,3.294] FU measurement uncertainty
79- 90 E12.6 0.363mJy FU38 [-0.681,35010] Observed flux in U38 band (2)
92-100 E9.5 0.363mJy e_FU38 [0.083,7.711] FU38 measurement uncertainty
102-113 E12.6 0.363mJy FB [-0.6,30406] Observed flux in B-band (2)
115-123 E9.6 0.363mJy e_FB [0.03,3.08] FB measurement uncertainty
125-136 E12.6 0.363mJy FV [-0.8,61857] Observed flux in V-band (2)
138-146 E9.6 0.363mJy e_FV [0.04,4.551] FV measurement uncertainty
148-159 E12.6 0.363mJy FR [-1.3,114880] Observed flux in R-band (2)
161-169 E9.6 0.363mJy e_FR [0.05,6.221] FR measurement uncertainty
171-182 E12.6 0.363mJy FI [-2.6,282972] Observed flux in I-band (2)
184-192 E9.7 0.363mJy e_FI [0.24,23.61] FI measurement uncertainty
194-205 E12.6 0.363mJy Fz' [-116,574102] Observed flux in z' band (2)
207-215 E9.5 0.363mJy e_Fz' [0.49,52.52] Fz' measurement uncertainty
217-228 E12.6 0.363mJy FJ [-35,1.273e+6] Observed flux in J-band (2)
230-238 E9.4 0.363mJy e_FJ [0.633,137.5] FJ measurement uncertainty
240-251 E12.6 0.363mJy FH [-2e+8,8.23e+9] Observed flux in H-band (2)
253-261 E9.4 0.363mJy e_FH [1.1,30.3] FH measurement uncertainty
263-274 E12.6 0.363mJy FK [-2,2.115e+6] Observed flux in K-band (2)
276-284 E9.4 0.363mJy e_FK [1.37,96.41] FK measurement uncertainty
286-290 F5.2 arcsec diam2 [2.5,69.6] Effective diameter of the AUTO
aperture, on which the total K flux
measurement is based
292-311 F20.13 --- FKtot [-29,760570] Total K flux-based on
SExtractor's AUTO measurement (3)
313-321 E9.4 --- e_FKtot [1.5,18.95] FK_tot measurement uncertainty (3)
323-332 E10.4 --- FK4ap [-47,492100] K flux, as measured in a
4" aperture
334-342 E9.4 --- e_FK4ap [0,2.301] FK_4ap measurement uncertainty
344-363 F20.13 --- FKSEx [-28,760570] K flux within SExtractor's
AUTO aperture
365-373 E9.4 --- e_FKSEx [1.3,92.3] FK_auto measurement uncertainty
375-384 F10.6 arcsec R50 [-10,119.113] K-band half-light radius
(where the "total" light here is the AUTO
flux) (4)
386-390 F5.3 --- Ell [0,0.788] K band ellipticity (4)
392-397 F6.2 deg PA [-90,90] K band position angle (4)
399-402 F4.2 --- Uw [0,1.51] Relative weight in the U-band
normalized to Int.Time=21.91h (5)
404-407 F4.2 --- U38w [0,1.01] Relative weight in the U38-band
normalized to Int.Time=13.75h (5)
409-412 F4.2 --- Bw [0,1.77] Relative weight in the B-band
normalized to Int.Time=19.29h (5)
414-417 F4.2 --- Vw [0,2.64] Relative weight in the V-band
normalized to Int.Time=29.06h (5)
419-422 F4.2 --- Rw [0,1.91] Relative weight in the R-band
normalized to Int.Time=24.35h (5)
424-427 F4.2 --- Iw [0,1.33] Relative weight in the I-band
normalized to Int.Time=9.60h (5)
429-432 F4.2 --- z'w [0,1] Relative weight in the z' band
normalized to Int.Time=1.30h (5)
434-438 F5.2 --- Jw [0,2.64] Relative weight in the J-b
normalized to Int.Time=1.33h and (5)
440-444 F5.2 --- Hw [0,56.98] Relative weight in the H-band (5)
446-449 F4.2 --- Kw [0.21,2.82] Relative weight in the K-band (5)
451-455 I5 --- idSEx [770,24285] The original SExtractor identifier
for use with the SExtractor generated
segmentation map (6)
457 I1 --- f1 [1,1] Deblending flag from SExtractor
indicating whether an object has been
deblended
459 I1 --- f2 [0,1] Deblending flag from SExtractor
indicating whether that object's photometry is
significantly affected by a near neighbor
461-471 F11.8 --- zs ?=-1. Literature spectroscopic redshift
determination (7)
473-479 A7 --- r_zs Source code for zs (7)
481-484 A4 --- q_zs Quality flag for zs, from source
486-491 A6 --- Sptype Spectral classification, from source
493-509 E17.9 --- Qzs ?=-99. Figure of merit for zs, from
photometry (8)
510 A1 --- n_Qzs [I] I for infinity
512 I1 --- n_zs [0,5] Number of corroborating zs
determinations
514 I1 --- f_zs [0,1] Flag indicating wheter zs is considered
"robust"
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Note (1): Effective diameter (i.e., (4πA)0.5, where A is the aperture area)
we use the larger of SExtractor's ISO aperture and a 2.5" diameter
aperture to measure colors (see Section 4.5).
Note (2): All fluxes are given in such a way that they can be transformed to AB
magnitudes using a zero-point of 25; in other words, fluxes are given
in units of 0.363mJy.
Note (3): Total K flux-based on SExtractor's AUTO measurement - with corrections
applied for missed flux and background over-subtraction (see Section
4.3) - and the associated measurement uncertainty, which accounts for
correlated noise, random background subtraction errors, spatial
variations in the noise, Poisson shot noise, etc. (see Section 4.6)
Note (4): Morphological parameters from SExtractor, measured from the 1" FWHM
K image.
Note (5): For all but the z' and H bands, this is essentially the exposure time,
normalized by the nominal values.
For the H band, this value is derived from the mock exposure map
described in Section 3.1;
for the z' band, this is a binary flag indicating whether the z'
photometry is significantly affected by light from a nearby bright
star.
Note (6): Recall that we have excised all detections with an effective exposure
time of less than 12 minutes from the catalog output by SExtractor.
Note (7): Spectroscopic redshifts have been collected from a number of public,
published works. In collacting these redshifts, where multiple
(consistent) redshift determinations are available for a given object,
we have chosen to adopt the first published determination, except
where a later determination includes spectral classification data not
given previously. We also choose Xray selected catalogues (viz.
Szokoly et al. (2004, Cat. J/ApJS/155/271 and Treister et al.,
2009ApJ...693.1713T 2009ApJ...693.1713T) in preference to others,
considering Xray selection as an additional piece of classification
information. Where there is no consensus (e.g. two different redshifts
from two different sources), we have chosen according to the quality
flags. The codes for spectroscopic redshift sources are as follows:
K20 = Cimatti et al. (2002, Cat. J/A+A/392/395), Mignoli et al. (2005,
Cat. J/A+A/437/883)
Xray = Szokoly et al. (2004, Cat. J/ApJS/155/271)
VVDS = Le Fevre et al. (2004, Cat. J/A+A/428/1043)
GDS-F = Vanzella et al. (2005, Cat. J/A+A/434/53,
2006, Cat. J/A+A/454/423, 2008, Cat. J/A+A/478/83)
GDS-V = Popesso et al. (2008, 2009A&A...494..443P 2009A&A...494..443P)
IMAGES = Ravikumar et al. (2007, Cat. J/A+A/465/1099)
MUS-I, MUS-V = Treister et al. (2009ApJ...693.1713T 2009ApJ...693.1713T)
Kopsv = Koposov et al. (in prep.)
KX = Croom et al. (2001, Cat. J/MNRAS/328/150)
SNe = Strolger et al. (2004, Cat. J/ApJ/613/200)
vdWel = Van der Wel et al. (2004ApJ...601L...5V 2004ApJ...601L...5V, 2005ApJ...631..145V 2005ApJ...631..145V)
Daddi = Daddi et al. (2005ApJ...626..680D 2005ApJ...626..680D)
LCIRS = Doherty et al. (2005, Cat. J/MNRAS/361/525)
Kriek = Kriek et al. (2006ApJ...649L..71K 2006ApJ...649L..71K).
Note (8): For each spectroscopic redshift determination, we have evaluated a
"figure of merit", characterising the consistency of the photometry
with that redshift, using the recipe described by Brammer et al.
(2008ApJ...686.1503B 2008ApJ...686.1503B).
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Byte-by-byte Description of file: zphot.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq [1,16910]+ Object identifier as in the
photometric catalog
7- 16 F10.6 --- --- [-99] Spectroscopic redshift determination as
given in the photometric catalog
18- 24 F7.3 --- za ?=-99 Maximum likelihood redshift, allowing
non-negative combinations of all six of the
default EAZY templates
26- 32 F7.3 --- zm1 ?=-99 Probability-weighted mean redshift
without the inclusion of a K luminosity prior
34- 45 E12.6 --- chia ?=-99.000 Chi2 value associated with each fit
47- 53 F7.3 --- zp ?=-99 Maximum likelihood redshift, allowing
non-negative combinations of all six of the
default EAZY templates with the inclusion of a
K luminosity prior
55- 66 E12.6 --- chip ?=-99 Chi2 value associated with each fit
68- 74 F7.3 --- zm2 ?=-99 Probability-weighted mean redshift with
the inclusion of a K luminosity prior;
recommended as redshift estimator
76- 82 F7.3 --- odds ?=-99 The fraction of the total integrated
probability within ±0.2 of the zm2 value
84- 90 F7.3 --- z68l ?=-99 Lower limit on redshift at 68% confidence
92- 98 F7.3 --- z68u ?=-99 Upper limit on redshift at 68% confidence
100-106 F7.3 --- z95l ?=-99 Lower limit on redshift at 95% confidence
108-114 F7.3 --- z95u ?=-99 Upper limit on redshift at 95% confidence
116-122 F7.3 --- z99l ?=-99 Lower limit on redshift at 99% confidence
124-130 F7.3 --- z99u ?=-99 Upper limit on redshift at 99% confidence
132-134 I3 --- Npt ?=-99 The number of photometric points used to
calculate all of the above
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Byte-by-byte Description of file: restfr.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq [1,16910]+ Object identifier as in the
photometric catalog
7- 13 F7.3 --- z ?=-99.000 Assumed redshift; we use either the
zm2 value output by EAZY, or the spectroscopic
redshift, where available
15- 24 E10.4 --- RFBU ?=-99.000 Rest-frame photometry for
Bessel U filter
26- 27 I2 --- extrapnf [-1,1] Extrapn flag from InterRest (1)
29 I1 --- wigapnf [0,3] Widegapn flag from InterRest (2)
31- 40 E10.4 --- RFBB ?=-99.000 Rest-frame photometry for
Bessel B filter
42- 43 I2 --- exBBf [-1,1] Extrapn flag (1)
45 I1 --- wiBBf [0,3] Widegapn flag (2)
47- 56 E10.4 --- RFBV ?=-99.000 Rest-frame photometry for
Bessel V filter
58- 59 I2 --- exBVf [-1,1] Extrapn flag (1)
61 I1 --- wiBVf [0,3] Widegapn flag (2)
63- 72 E10.4 --- RFBR ?=-99.000 Rest-frame photometry for
Bessel R filter
74- 75 I2 --- exBRf [-1,1] Extrapn flag (1)
77 I1 --- wiBRf [0,3] Widegapn flag (2)
79- 88 E10.4 --- RFBI ?=-99.000 Rest-frame photometry for
Bessel I filter
90- 91 I2 --- exBIf [-1,1] Extrapn flag (1)
93 I1 --- wiBIf [0,3] Widegapn flag (2)
95-104 E10.4 --- RFJU ?=-99.000 Rest-frame photometry for
Johnson-Cousins U filter
106-107 I2 --- exJUf [-1,1] Extrapn flag (1)
109 I1 --- wiJUf [0,3] Widegapn flag (2)
111-120 E10.4 --- RFJB ?=-99.000 Rest-frame photometry for
Johnson-Cousins B filter
122-123 I2 --- exJBf [-1,1] Extrapn flag (1)
125 I1 --- wiJBf [0,3] Widegapn flag (2)
127-136 E10.4 --- RFJV ?=-99.000 Rest-frame photometry for
Johnson-Cousins V filter
138-139 I2 --- exJVf [-1,1] Extrapn flag (1)
141 I1 --- wiJVf [0,3] Widegapn flag (2)
143-152 E10.4 --- RFJR ?=-99.000 Rest-frame photometry for
Johnson-Cousins R filter
154-155 I2 --- exJRf [-1,1] Extrapn flag (1)
157 I1 --- wiJRf [0,3] Widegapn flag (2)
159-168 E10.4 --- RFJI ?=-99.000 ] Rest-frame photometry for
Johnson-Cousins I filter
170-171 I2 --- exJIf [-1,1] Extrapnflag (1)
173 I1 --- wiJIf [0,3] Widegapn flag (2)
175-184 E10.4 --- RFGu ?=-99.000 Rest-frame photometry for
Gunn u filter
186-187 I2 --- exGuf [-1,1] Extrapn flag (1)
189 I1 --- wiGuf [0,3] Widegapn flag (2)
191-200 E10.4 --- RFGg ?=-99.000 Rest-frame photometry for
Gunn g filter
202-203 I2 --- exGgf [-1,1] Extrapn flag (1)
205 I1 --- wiGgf [0,3] Widegapn flag (2)
207-216 E10.4 --- RFGr ?=-99.000 Rest-frame photometry for
Gunn r filter
218-219 I2 --- exGrf [-1,1] Extrapn flag (1)
221 I1 --- wiGrf [0,3] Widegapn flag (2)
223-232 E10.4 --- RFGi ?=-99.000 Rest-frame photometry for
Gunn i filter
234-235 I2 --- exGif [-1,1] Extrapn flag (1)
237 I1 --- wiGif [0,3] Widegapn flag (2)
239-248 E10.4 --- RFGz ?=-99.000 Rest-frame photometry for
Gunn z filter
250-251 I2 --- exGzf [-1,1] Extrapn flag (1)
253 I1 --- wiGzf [0,3] Widegapn flag (2)
255-264 E10.4 --- RFNUV ?=-99.000 Rest-frame photometry for
GALEX NUV filter
266-267 I2 --- exNUVf [-1,0] Extrapn flag (1)
269 I1 --- wiNUVf [0,3] Widegapn flag (2)
271-280 E10.4 --- RFFUV ?=-99.000 Rest-frame photometry for
GALEX FUV filter (3)
282-283 I2 --- exFUVf [-1,0] Extrapnflag (1)
285 I1 --- wiFUVf [0,3] Widegapn flag (2)
287-292 F6.2 --- Dist ?=-99.00 The distance modulus implied by
redshift, assuming a given cosmology (4)
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Note (1): Flag outputs by InteRest, extrapn, where n refers to the
rest-frame filter number, which indicates where it has extrapolated
beyond the observed SED.
Note (2): Flag outputs by InteRest, widegapn, where n refers to the
rest-frame filter number, which indicates where it has not used
neighboring filters due to, for example, missing or negative
photometry.
Note (3): -99 in the RFFUV column means Infinite value.
Note (4): the fluxes are observed fluxes through rest-frame filters:
therefore the conversion to apparent and rest-frame magnitudes using
the appropriate zero-point and distanc modulus should be performed.
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History:
Copied from http://www.astro.yale.edu//MUSYC/
(End) Emmanuelle Perret [CDS] 26-Jan-2010