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J/AJ/128/1       First Look Survey: NOAO R-band Mosaic            (Fadda+, 2004)

The Spitzer Space Telescope First-Look Survey: KPNO Mosaic-1 R-band images and source catalogs. Fadda D., Jannuzi B.T., Ford A., Storrie-Lombardi L.J. <Astron. J., 128, 1-15 (2004)> =2004AJ....128....1F
ADC_Keywords: Galaxies, photometry Keywords: catalogs - galaxies: photometry Abstract: We present R-band images covering more than 11 square degrees of sky that were obtained in preparation for the Spitzer Space Telescope First-Look Survey (FLS). The FLS was designed to characterize the mid-infrared sky at depths 2 orders of magnitude deeper than previous surveys. The extragalactic component is the first cosmological survey done with Spitzer. Source catalogs extracted from the R-band images are also presented. The R-band images were obtained using the Mosaic-1 camera on the 4m Mayall Telescope of the Kitt Peak National Observatory. Two relatively large regions of the sky were observed to modest depth: the main FLS extragalactic field (17h18m00s, +59°30'00.0"[J2000]; l=88.3°, b=+34.9°) and the ELAIS-N1 field (16h10m01s, +54°30'36.0"; l=84.2°, b=+44.9°). While both these fields were in early plans for the FLS, only a single deep-pointing test observation was made at the ELAIS-N1 location. The larger Legacy program SWIRE will include this region among its surveyed areas. The data products of our KPNO imaging (images and object catalogs) are made available to the community through the World Wide Web (via the Spitzer Science Center and NOAO Science Archive, http://ssc.spitzer.caltech.edu/fls/). The overall quality of the images is high. The measured positions of sources detected in the images have rms uncertainties in their absolute positions on the order of 0.35" with possible systematic offsets on the order of 0.1", depending on the reference frame of comparison. The relative astrometric accuracy is much better than 1/10 of an arcsecond. Typical delivered image quality in the images is 1.1" full width at half-maximum. The images are relatively deep, since they reach a median 5σ depth limiting magnitude of R=25.5 (Vega) as measured within a 1.35 FWHM aperture, for which the signal-to-noise ratio (S/N) is maximal. Catalogs have been extracted with SExtractor, using thresholds in area and flux for which the number of false detections is below 1% at R=25. Only sources with S/N>3 have been retained in the final catalogs. Comparing the galaxy number counts from our images with those of deeper R-band surveys, we estimate that our observations are 50% complete at R=24.5. These limits in depth are sufficient to identify a substantial fraction of the infrared sources that will be detected by Spitzer. Use of the data: Use of these data must be accompanied by citation of the paper and acknowledgment: "The National Optical Astronomy Observatory (NOAO) is operated by the Association of Universities for Research in Astronomy (AURA), Inc. under cooperative agreement with the National Science Foundation." File Summary: File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 35 30 Nominal coordinates of the observed subfields table5.dat 69 32 Properties of images and extracted catalogs fls/* 90 25 *FLS sources elais/* 90 7 *ELAIS field sources
Note on fls/* and elais/*: The first 10 lines (starting by #) enumerate the columns
See also: http://ssc.spitzer.caltech.edu/fls/ : First Look Survey Home Page II/255 : SWIRE ELAIS N1 Source Catalogs (Surace+, 2004) J/A+A/424/371 : 1.4GHz First Look Survey (FLS) (Morganti+, 2004) J/AJ/125/2411 : SIRTF First-Look Survey (Condon+, 2003) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Field Field ID 9- 10 I2 h RAh Hour of Right Ascension (J2000) 12- 13 I2 min RAm Minute of Right Ascension (J2000) 15- 19 F5.2 s RAs Second of Right Ascension (J2000) 22 A1 --- DE- Sign of the Declination (J2000) 23- 24 I2 deg DEd Degree of Declination (J2000) 26- 27 I2 arcmin DEm Arcmin of Declination (J2000) 29- 32 F4.1 arcsec DEs Arcsec of Declination (J2000) 35 I1 --- Nobs Number of 10 minute observations
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Subfield Subfield ID 12- 13 I2 h RAh Hour of Right Ascension (J2000) 15- 16 I2 min RAm Minute of Right Ascension (J2000) 18- 22 F5.2 s RAs Second of Right Ascension (J2000) 24 A1 --- DE- Sign of the Declination (J2000) 25- 26 I2 deg DEd Degree of Declination (J2000) 28- 29 I2 arcmin DEm Arcminute of Declination (J2000) 31- 35 F5.2 arcsec DEs Arcsecond of Declination (J2000) 38- 41 F4.2 arcsec Seeing Seeing of the combined image 44- 48 F5.2 mag Rlim5 5 σ limiting Cousins R magnitude 51- 55 F5.2 mag Rlim3 3 σ limiting Cousins R magnitude 58- 62 I5 --- Ngal Number of galaxies (1) 65- 69 I5 --- Nstar Number of stars (1)
Note (1): With S/N≥3 that are not saturated.
Byte-by-byte Description of file (# headlines): fls/* elais/*
Bytes Format Units Label Explanations
1- 6 A6 --- --- [FLSR] 7- 22 A16 --- Source Source designation (based on J2000 position) 24- 25 I2 h RAh Hour of Right Ascension (J2000) 26 A1 --- --- [:] 27- 28 I2 min RAm Minute of Right Ascension (J2000) 29 A1 --- --- [:] 30- 35 F6.3 s RAs Second of Right Ascension (J2000) 37 A1 --- DE- Sign of the Declination (J2000) 38- 39 I2 deg DEd Degree of Declination (J2000) 40 A1 --- --- [:] 41- 42 I2 arcmin DEm Arcminute of Declination (J2000) 43 A1 --- --- [:] 44- 48 F5.2 arcsec DEs Arcsec of Declination (J2000) 50- 54 F5.2 mag RcmagAp ?=99.00 Aperture (3") R magnitude (Cousins) 56- 60 F5.2 mag e_RcmagAp ?=99.00 Error in RcmagAp 62- 66 F5.2 mag RcmagTot Total R magnitude (Cousins) 69- 72 F4.2 mag e_RcmagTot Error in RcmagTot 74- 78 F5.1 --- S/N ?=* Signal-to-noise ratio of the detection 80- 84 F5.3 --- Class Stellarity index computed by SExtractor (1) 86- 90 F5.3 --- Ext The Galactic extinction, taken from Schlegel et al. (1998ApJ...500..525S)
Note (1): With 0 for a galaxy, and 1 for a star.
History: From electronic version of the journal
(End) Marianne Brouty [CDS] 16-Jun-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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