J/A+A/566/A60 Optical-NIR catalog of AKARI NEP Deep Field (Oi+, 2014)
Optical-near-infrared catalogue for the AKARI North Ecliptic Pole Deep Field.
Oi N., Matsuhara H., Murata K., Goto T., Wada T., Takagi T., Ohyama Y.,
Malkan M., Im M., Shim H., Serjeant S., Pearson C.
<Astron. Astrophys. 566, A60 (2014)>
=2014A&A...566A..60O 2014A&A...566A..60O
ADC_Keywords: Surveys ; Galaxies, IR ; Photometry, SDSS ; Photometry, infrared
Keywords: methods: data analysis - catalogues - surveys - Galaxies: photometry -
optical: galaxies - infrared: galaxies
Description:
We present an 8-band (u*, g', r', i', z', Y, J, Ks) optical to
near-infrared deep photometric catalogue based on the observations
made with MegaCam and WIRCam at CFHT, and compute photometric
redshifts, zph in the North Ecliptic Pole (NEP) region, where AKARI
infrared satellite carried out deep survey at near to mid infrared
wavelength.
We designed the catalogue to include sources detected in z' band
with counterparts in at least one of the other bands, and found
85797 sources in the NEP field. Comparing with galaxy spectroscopic
redshifts, photometric redshift dispersion σ(Δz/(1+z))
is 0.032 and catastrophic failure rate Δz/(1+z)>0.15 is 5.8%
at z<1. Our redshifts are highly accurate with z'<22 at zph<2.5 and
for fainter sources with z'<24 at z<1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7.dat 223 85797 A optical-NIR band-merged catalog at the AKARI
NEP-Deep field
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See also:
J/A+A/559/A132 : AKARI NEP Deep Survey revised catalog (Murata+, 2013)
J/ApJS/207/37 : IR sources spectroscopy in the AKARI NEP (Shim+, 2013)
II/317 : The CFHTLS Survey (T0007 release) (Hudelot+ 2012)
Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- OBJID [1/85797] Internal Source ID
7- 14 F8.4 deg RAdeg Right ascension (J2000) (1)
16- 23 F8.4 deg DEdeg Declination (J2000) (1)
25- 31 F7.3 mag umag ?=-99 u* magnitude [CFHT/MegaCam]
33- 39 F7.3 mag e_umag ?=-99 u* magnitude error
41- 42 I2 --- f_umag [0/1]?=-1 u* magnitude flag, 0=ok (2)
44- 50 F7.3 mag gmag ?=-99 g' magnitude [CFHT/MegaCam]
52- 58 F7.3 mag e_gmag ?=-99 g' magnitude error
60- 61 I2 --- f_gmag [0/2]?=-1 g magnitude flag, 0=ok (2)
63- 69 F7.3 mag rmag ?=-99 r' magnitude [CFHT/MegaCam]
71- 77 F7.3 mag e_rmag ?=-99 r' magnitude error
79- 80 I2 --- f_rmag [0/2]?=-1 r magnitude flag, 0=ok (2)
82- 88 F7.3 mag imag ?=-99 i' magnitude [CFHT/MegaCam]
90- 96 F7.3 mag e_imag ?=-99 i' magnitude error
98- 99 I2 --- f_imag [0/2]?=-1 i' magnitude flag, 0=ok (2)
101-107 F7.3 mag zmag ?=-99 z' magnitude [CFHT/MegaCam]
109-115 F7.3 mag e_zmag ?=-99 z' magnitude error
117-123 F7.3 mag Ymag ?=-99 Y magnitude [CFHT/WIRCam]
125-131 F7.3 mag e_Ymag ?=-99 Y magnitude error
133-134 I2 --- f_Ymag [0/2]?=-1 Y magnitude flag, 0=ok (2)
136-142 F7.3 mag Jmag ?=-99 J magnitude [CFHT/WIRCam]
144-150 F7.3 mag e_Jmag ?=-99 J magnitude error
152-153 I2 --- f_Jmag [0/2]?=-1 J magnitude flag, 0=ok (2)
155-161 F7.3 mag Kmag ?=-99 Ks magnitude [CFHT/WIRCam]
163-169 F7.3 mag e_Kmag ?=-99 Ks magnitude error
171-172 I2 --- f_Kmag [0/2]?=-1 Ks magnitude flag, 0=ok (2)
174-177 F4.2 --- stl [0/1] Stellarity from the Megacam z' (3)
179-182 A4 --- star Star flag from uJgK colour (4)
184-190 F7.3 --- zsp1 ?=-99 Spectroscoptic redshift
with Keck/DEIMOS (5)
192-194 I3 --- q_zsp1 [-5/5]?=-99 Flag of zsp1, 5=secure (6)
196-202 F7.3 --- zsp2 ?=-99 Spectroscoptic redshift with
MMT/Hectospec and WIYN/HYDRA (7)
204-208 F5.1 --- q_zsp2 [0/4]?=-99 Flag of zsp2,4=secure (8)
210-216 A7 --- Cl2 Source classification from spectra of
MMT/Hectospec and WIYN/HYDRA (7) (9)
217-221 F5.3 --- zph Photometric redshift (10)
223 A1 --- Cl [G/S] Class from χ2 of SED fitting (11)
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Note (1): The coordinates of the objects. It is from MegaCam z' band.
Note (2): Flag is from the ground-based catalogue:
0 = no problem.
1 = multiple counterparts are found in other band (i.e. u*, g', r',i', Y,
J, and Ks). The magnitude is summed of all the candidate magnitudes.
2 = multiple z' band sources have one common counterpart in other band.
-1 = no detection.
Note (3): Stellarity information provided by 'SExtractor' in z' band.
(1=stellar, 0=extended)
Note (4): Flags of stars based on (u*-J) vs (g'-Ks) colour-colour diagram:
STAR = identified as a star
**** = not identified as a star
Note (5): Spectroscopic redshift and flags measured by Takagi et al. (in prep.)
using Keck/DEIMOS.
Note (6): Keck/DEIMOS flag on spectroscopic redshift:
5 = secure redshift with multiple lines, including spectroscopically
resolved [OII] doublet.
3 = redshift from absorption lines only.
2 = redshift from single line, probably [OII].
1 = single line with less confidence.
-1 = problem in data.
-3 = redshift from absorption lines only, with problems in data.
-5 = secure redshift, but problems in data.
-99 = no Keck/DEIMOS spectral data.
Note (7): Spectroscopic redshift, flags and Classifications MMT/Hectospec and
WIYN/HYDRA (Shim et al., 2013, Cat. J/ApJS/207/37).
Note (8): Flag on spectroscopic redshift:
4.0 = the redshift is clearly identified using more than two significant
spectral features.
3.0 = the redshift is very likely identified. Multiple spectral features are
used, but some of the features have low signal-to-noise ratio.
2.5 = objects which seem to be between flags 2 and 3.
2.0 = the redshift is identified based on single, weak spectral features
(including continuum break). Probable, but unreliable.
1.5 = the spectral features are very weak, might be real, but not reliable.
-99.0 = no spectral data taken with MMT/Hectospec and WIYN/HYDRA.
Note (9): There are 5 classifications; GALAXY, STAR, TYPE1, TYPE2, and UNKNOWN.
Note (10): Photometric redshift (zph) for galaxy measured by SED fitting.
Star-flagged sources from (u*-J) vs (g'-Ks) colour-colour diagram and spectra
have a zph value of 0.000.
Note (11): Classes (star/galaxy) from SED fitting χ2 values:
S = χstar < χgal
G = χgal < χstar
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History:
* 26-Mar-2014: Documentation prepared at ISAS/JAXA by Nagisa Oi
Acknowledgements:
Nagisa Oi, nagisaoi(at)ir.isas.jaxa.jp
(End) Nagisa Oi [ISAS/JAXA], Patricia Vannier [CDS] 26-Mar-2014