J/MNRAS/443/725 Optical-UV-IR survey of North Celestial Cap (Gorbikov+, 2014)
An optical-UV-IR survey of the North Celestial Cap. I. The catalogue.
Gorbikov E., Brosch N.
<Mon. Not. R. Astron. Soc., 443, 725-737 (2014)>
=2014MNRAS.443..725G 2014MNRAS.443..725G
ADC_Keywords: Surveys ; Photometry, VRI ; Photometry, infrared
Keywords: methods: data analysis - methods: statistical - catalogues surveys
Abstract:
We describe the final product of the North Celestial Cap Survey (NCCS)
- the optical-UV-IR merged catalogue for the region within 10° of
the North Celestial Pole. The North Celestial Cap (NCC) region at
δ≥80° is poorly covered by modern CCD-based surveys. The
optical part of the survey was observed in V, R and I with the
Wide-field Infrared Survey Explorer (WISE) Observatory telescopes and
was merged with GALEX UV and WISE IR data, producing the catalogue.
More than four million objects were observed in at least one optical
band. The final catalogue contains ∼1.6 million sources observed in
all three optical bands, of which some 1.4 million have WISE
counterparts and ∼300000 have GALEX counterparts. The astrometric
accuracy of the optical NCCS data, derived from a comparison with the
UCAC3 catalogue, is better than 0.2-arcsec and the photometry, when
compared with Sloan Digital Sky Survey, is good to ∼0.15mag for
sources brighter than V=20.3, R=21.0 and I=19.2mag. The Sloan Digital
Sky Survey point-extended source separation is reproduced with >92 per
cent efficiency.
Description:
For optical catalog, Cousins R and I images were collected with the
1-m Ritchey-Chretien telescope and the Large Area Imager for the
Wise Observatory. R and I data were collected on 83 nights, from 2009
January 10 to 2011 May 2. Johnson V-band images were obtained with the
0.46-m Centurion 18 (C18) prime-focus telescope of the Wise
Observatory. The V data were collected on 102 nights from 2011 June 24
to 2012 May 4.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 110 4097106 *Full optical uncleaned NCCS catalogue
(catalog_final.dat)
cleancat.dat 253 1569292 Cleaned and matched optical-UV-IR catalogue
(catalogcleanwise_galex.dat)
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Note on catalog.dat: 10 sources were removed at CDS, which originally
contain invalid positions and huge positional errors, see Note (1) below.
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See also:
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- Seq [1/4102998] Catalogue object name (1)
9 I1 --- St [1/3] Object status (G1)
11- 19 F9.5 deg RAdeg Right ascension (J2000.0)
21- 25 F5.3 arcsec e_RAdeg [0/0.7] rms uncertainty on RAdeg
27- 35 F9.5 deg DEdeg Declination (J2000.0)
37- 41 F5.3 arcsec e_DEdeg [0/0.9] rms uncertainty on DEdeg
43- 48 F6.3 mag Vmag ?=0 Johnson V magnitude
50- 55 F6.3 mag e_Vmag ? rms uncertainty on Vmag
57- 62 F6.3 mag Rmag ?=0 Cousins R magnitude
64- 69 F6.3 mag e_Rmag ? rms uncertainty on Rmag
71- 76 F6.3 mag Imag ?=0 Cousins I magnitude
78- 83 F6.3 mag e_Imag ? rms uncertainty on Imag
85- 90 F6.3 --- ewV ? Relative εFWHM in V band
92- 97 F6.3 --- ewR ? Relative εFWHM in R band
99-104 F6.3 --- ewI ? Relative εFWHM in I band
106 I1 --- fV [0/7] Sextractor internal flag in V band
108 I1 --- fR [0/7] Sextractor internal flag in R band
110 I1 --- fI [0/7] Sextractor internal flag in I band
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Note (1): 5 sources with invalid positions and huge positional errors were
removed, corresponding to Seq numbers 68573, 499554, 1250528, 1272591,
1688136, 1688195, 2390308, 2405287, 2915268, and 2915268.
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Byte-by-byte Description of file: cleancat.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- Seq [1/3848648] Catalogue object name
9 A1 --- St [3] Object status (G1)
11- 19 F9.5 deg RAdeg Right ascension (J2000.0)
21- 25 F5.3 arcsec e_RAdeg [0.008/0.09] rms uncertainty on RAdeg
27- 35 F9.5 deg DEdeg Declination (J2000.0)
37- 41 F5.3 arcsec e_DEdeg [0.01/0.29] rms uncertainty on DEdeg
43- 48 F6.3 mag Vmag Johnson V magnitude
50- 55 F6.3 mag e_Vmag rms uncertainty on Vmag (0/699)
57- 62 F6.3 mag Rmag Cousins R magnitude
64- 69 F6.3 mag e_Rmag rms uncertainty on Rmag (0/442)
71- 76 F6.3 mag Imag Cousins I magnitude
78- 83 F6.3 mag e_Imag rms uncertainty on Imag (0/598)
85- 90 F6.3 --- ewV [0/39] Relative εFWHM in V band
92- 97 F6.3 --- ewR [0.4/38] Relative εFWHM in R band
99-104 F6.3 --- ewI [0.4/53] Relative εFWHM in I band
106 I1 --- fV [0/7] Sextractor internal flag in V band
108 I1 --- fR [0/7] Sextractor internal flag in R band
110 I1 --- fI [0/7] Sextractor internal flag in I band
112 I1 --- PESS [0/3] PESS score: 0/1=star, 2/3=galaxy (1)
114-122 F9.5 deg RAWdeg ?=0 Matched WISE source right
ascension (J2000)
124-132 F9.5 deg DEWdeg ?=0 Matched WISE source declination (J2000)
134-138 F5.3 arcsec e_RAWdeg ?=0 rms uncertainty on RAWdeg
140-144 F5.3 arcsec e_DEWdeg ?=0 rms uncertainty on DEWdeg
146-151 F6.3 --- Ct [-1/1]? Cross-term of WISE coordinate errors
σαδ
153-158 F6.3 mag W1mag ?=0 WISE source W1 magnitude
160-164 F5.3 mag e_W1mag ?=0 rms uncertainty on W1mag
166-171 F6.3 mag W2mag ?=0 WISE source W2 magnitude
173-177 F5.3 mag e_W2mag ?=0 rms uncertainty on W2mag
179-184 F6.3 mag W3mag ?=0 WISE source W3 magnitude
186-190 F5.3 mag e_W3mag ?=0 rms uncertainty on W3mag
192-197 F6.3 mag W4mag ?=0 WISE source W4 magnitude
199-203 F5.3 mag e_W4mag ?=0 rms uncertainty on W4mag
205-213 F9.5 deg RAGdeg ?=0 Matched GALEX source right
ascension (J2000)
215-223 F9.5 deg DEGdeg ?=0 Matched GALEX source declination (J2000)
225-230 F6.3 mag NUV ?=0 GALEX source NUV magnitude
232-237 F6.3 mag e_NUV ?=-9.999 rms uncertainty on NUV
239-244 F6.3 mag FUV ?=0 GALEX source FUV magnitude
246-251 F6.3 mag e_FUV ?=-9.999 rms uncertainty on FUV
253 A1 --- AGN [0/1] AGN candidate flag
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Note (1): The PESS score is (see section 3.5):
0 = object is defined as 'star' in all the three optical bands
1 = object is defined as 'galaxy' in one of the bands
2 = object is defined as 'galaxy' in two bands
3 = object is defined as 'galaxy' in all the bands
Bin 0 of the PESS score was found to contain almost exclusively SDSS stars,
bin 1 contains mostly SDSS stars, bin 2 contains mostly SDSS galaxies and
bin 3 contains almost exclusively SDSS galaxies.
Therefore, all NCCS sources with a PESS 0 or 1 are defined as
'point-like objects', while those with PESS 2 or 3 are classified as
'extended objects', accepting a small fraction of cross-contamination.
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Global notes:
Note (G1): Status is:
3 = object observed in all three optical filters, thus its V, R and I
magnitudes are calibrated and colour-corrected (38.3%)
2 = object was observed in R and I only and lacks a V counterpart; the R and I
magnitudes are calibrated and colour-corrected while V is missing (16.8%)
1 = object was not observed in either R or I or in both bands, thus all its
magnitudes are neither calibrated nor colour-corrected (44.9%)
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History:
Copied at ftp://wise-gate.tau.ac.il/pub/evgenyg/
(End) Patricia Vannier [CDS] 24-Mar-2015