II/255 SWIRE ELAIS N1 Source Catalogs (Surace+, 2004)
The SWIRE ELAIS N1 Image Atlas and Source Catalogs.
Surace J.A., Shupe D.L., Fang F., Lonsdale C.J., Gonzalez-Solares E.,
Baddedge T., Frayer D., Evans T., Jarrett T., Padgett D.L., Castro S.,
Masci F., Domingue D., Fox M., Rowan-Robinson M., Perez-Fournon I.,
Olivier S., Poletta M., Berta S., Rodighiero G., Vaccari M., Stacey G.,
Hatziminaoglou E., Farrah D., Siana B., Smith H.E., Franceschini A.,
Owen F., Pierre M., Xu C., Afonso-Luis A., Davoodi P., Dole H., Pozzi F.,
Salaman M., Waddington I.
<Spitzer Science Center, California Institute of Technology (2004)>
ADC_Keywords: Surveys ; Galaxies, IR ; Photometry, infrared
Mission_Name: Spitzer
Description:
The Spitzer Wide-area InfraRed Extragalactic survey (SWIRE; Lonsdale
et al., 2003PASP..115..897L 2003PASP..115..897L) Version 1.0 data products release
includes an image atlas and a source catalogs from the first of the
6 SWIRE fields to be observed by Spitzer, the ELAIS-N1 field. The
release includes both Spitzer IRAC and MIPS mid/far-infrared data
products and also Ug'r'i'Z optical data covering the same regions
of the sky from the Isaac Newton Telescope (INT) Wide-Field Survey
(WFS; McMahon et al., 2001NewAR..45...97M 2001NewAR..45...97M; Gonzalez-Solares et al.,
2004, MNRAS, in press).
The Version 1.0 SWIRE ELAIS-N1 Source Catalogs have three parts:
(1) a catalog including IRAC and MIPS 24µm sources which have
been band-merged together. The Spitzer source list has been
positionally matched to the optical source list and we report
optical position and 5-band magnitude data for each successful
match. This catalog contains only sources lying with the region
which has full coverage in all four IRAC bands;
(2) a 70µm catalog; and
(3) a 160µm catalog. The longer wavelength catalogs have not been
band-merged with the IRAC+24µm catalog or the optical source
list at this time because of complex source confusion issues.
The two MIPS-Ge catalogs cover the full area scanned by each
MIPS-array, except for areas of low coverage around each edge,
and are not restricted to the full IRAC coverage area.
All data are available at
http://data.spitzer.caltech.edu/popular/swire/20041027_enhanced_v1_EN1
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
iraccat.dat 402 187467 Optical Source Catalog. IRAC-24micron
(Version 1.0, 22 Oct. 2004)
mips70.dat 63 559 *SWIRE EN1 70um Point Source Catalog
(Version 1.0, 30mJy cut, Oct. 2004)
mips160.dat 64 178 *SWIRE EN1 160um Point Source Catalog
(Version 1.0, 200mJy cut, Oct. 2004)
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Note on mips70.dat: Catalog cut using flux>30mJy and S/N>5. Noise is
variable across the image. Average point source noise: rms=3mJy.
Note on mips160.dat: Catalog cut using flux>200mJy. Noise is variable
across the image. Average point source noise: rms=25mJy.
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See also:
http://data.spitzer.caltech.edu/popular/swire/20041027_enhanced_v1_EN1 :
SWIRE ELAIS-N1 Home Page
J/MNRAS/351/1290 : ELAIS: final band-merged catalogue (Rowan-Robinson+, 2004)
Byte-by-byte Description of file: iraccat.dat
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Bytes Format Units Label Explanations
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2- 7 A6 --- --- [SWIRE1]
8 A1 --- --- [_]
9- 27 A19 --- SWIRE SWIRE designation, based on J2000 positions
(Version 1.0)
31- 36 I6 --- CNTR Internal record number
38- 46 F9.5 deg RAdeg Right ascension in decimal degrees (J2000.0)
48- 56 F9.5 deg DEdeg Declination in decimal degrees (J2000.0)
60- 61 I2 --- Tile Numerical label denoting the IRAC ∼1x1 square
degree tile which the source is found in (1)
66- 73 F8.2 uJy F3.6um IRAC 3.6um aperture-corrected aperture flux (2)
79- 85 F7.2 uJy e_F3.6um rms uncertainty on F3.6um
89- 97 F9.2 uJy F4.5um IRAC 4.5um aperture-corrected aperture flux (2)
102-109 F8.2 uJy e_F4.5um rms uncertainty on F4.5um
113-121 F9.2 uJy F5.8um ?=-99. IRAC 5.8um aperture-corrected
aperture flux (2)
126-133 F8.2 uJy e_F5.8um ?=-99. rms uncertainty on F5.8um
137-145 F9.2 uJy F8.0um ?=-99. IRAC 8.0um aperture-corrected
aperture flux (2)
150-157 F8.2 uJy e_F8.0um ?=-99. rms uncertainty on F8.0um
161-169 F9.2 uJy F24um ?=-99. MIPS 24um aperture-corrected
aperture flux (2)
176-181 F6.2 uJy e_F24um ?=-99. rms uncertainty on F24um
185-190 F6.2 --- S/G3.6um ?=-99. SExtractor stellarity index for 3.6um
band (0:gal; 1:star)
194-199 F6.2 --- S/G4.5um ?=-99. SExtractor stellarity index for 4.5um
band (0:gal; 1:star)
203-208 F6.2 --- S/G5.8um ?=-99. SExtractor stellarity index for 5.8um
band (0:gal; 1:star)
212-217 F6.2 --- S/G8.0um ?=-99. SExtractor stellarity index for 8.0um
band (0:gal; 1:star)
221-226 F6.2 --- S/G24um ?=-99. SExtractor stellarity index for 24um
band (0:gal; 1:star)
229-237 F9.5 deg RAodeg ?=-99. Optical right ascension in decimal
degrees (J2000.0)
240-248 F9.5 deg DEodeg ?=-99. Optical declination in decimal
degrees (J2000.0)
250-255 F6.2 mag Umag ?=-99. INT WFS U aperture-corrected
aperture magnitude (3)
257-262 F6.2 mag e_Umag ?=-99. rms uncertainty on Umag
264-269 F6.2 mag g'mag ?=-99. INT WFS g' aperture-corrected
aperture magnitude (3)
271-276 F6.2 mag e_g'mag ?=-99. rms uncertainty on g'mag
278-283 F6.2 mag r'mag ?=-99. INT WFS r' aperture-corrected
aperture magnitude (3)
285-290 F6.2 mag e_r'mag ?=-99. rms uncertainty on r'mag
292-297 F6.2 mag i'mag ?=-99. INT WFS i' aperture-corrected
aperture magnitude (3)
299-304 F6.2 mag e_i'mag ?=-99. rms uncertainty on i'mag
306-311 F6.2 mag Zmag ?=-99. INT WFS Z aperture-corrected
aperture magnitude (3)
313-318 F6.2 mag e_Zmag ?=-99. rms uncertainty on Zmag
321-326 F6.2 mag Umagi ?=-99. Integrated INT WFS U magnitude (3)
329-334 F6.2 mag g'magi ?=-99. Integrated INT WFS g' magnitude (3)
337-342 F6.2 mag r'magi ?=-99. Integrated INT WFS r' magnitude (3)
345-350 F6.2 mag i'magi ?=-99. Integrated INT WFS i' magnitude (3)
353-358 F6.2 mag Zmagi ?=-99. Integrated INT WFS Z magnitude (3)
361-363 I3 --- f_Umag ?=-99 CASU stellarity flag on U band (4)
366-368 I3 --- f_g'mag ?=-99 CASU stellarity flag on g' band (4)
371-373 I3 --- f_r'mag ?=-99 CASU stellarity flag on r' band (4)
376-378 I3 --- f_i'mag ?=-99 CASU stellarity flag on i' band (4)
381-383 I3 --- f_Zmag ?=-99 CASU stellarity flag on Z band (4)
387-392 F6.2 arcsec Dist ?=-99. Distance of the optical match from the
Spitzer source. The search radius was 1.5".
401 I1 ---- f_2MASS [0/1] 1 = source which lies close to a
bright 2MASS star (5)
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Note (1): The tile labeling is illustrated in Figure 5 of the paper:
the first digit of the label refers to the row number and the second
refers to column within the tile layout. Thus, for example, the
lower-left-most tile is labelled as tile "11".
Note (2): Null values for fluxes and their uncertainties are denoted by
"-99.00". A null flux value does not necessarily mean a source has a
flux below the SWIRE sensitivity limit in this band.
There are three reasons a null value may exist: (1) non-detection to
the limits of source extraction; or (2) failure of the detected source
to meet the CSNR threshold criterion; or (3) lack of coverage in this
band. The third criterion should not apply to null IRAS values since
we have attempted to limit the IRAS-24um-Optical Catalog to the full
IRAC coverage area, but we do not guarantee this to be the case.
Note (3): INT WFS stands for Isaac Newton Telescope Wide-Field Survey.
Null values are denoted by "-99.00". A null magnitude value does not
necessarily mean a source has a flux below the plate limit in this
band. Instead there may be lack of coverage in this band. There are
optical coverage gaps within the full coverage IRAC field not only due
to the overall mismatch between the optical and IRAC coverage, but due
to gaps between the chips.
Note (4): Stellarity index generated by CASU pipeline is as follows.
-1 = star
0 = noise source
1 = extended object such as a galaxy
-2 = possible non-stellar but too faint to be sure
-3 = possible stellar but too faint to be sure
-8 = possible cross-match problem between bands
-9 = saturation
Note (5): If a source is found to lie within a given radius of a bright
star then there is a possibility that in one or more bands its flux
may be affected by artifacts from the star, or it may have missed
detection altogether due to the exclusion zone of the SExtractor
software. The radius used for setting the flag varies by star brightness.
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Byte-by-byte Description of file: mips70.dat
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Bytes Format Units Label Explanations
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2- 11 A10 --- --- [SWIRE170]
12- 24 A13 --- SWIRE70 SWIRE 70um designation (Version 1.0)
28- 36 F9.5 deg RAdeg Right ascension in decimal degrees (J2000.0) (1)
39- 47 F9.5 deg DEdeg Declination in decimal degrees (J2000.0) (1)
50- 55 F6.1 mJy F70um 70um flux (Flux uncertainties ∼20%)
58- 63 F6.4 --- PFP PSF fitting parameter (correlation coefficient) (2)
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Note (1): Positional uncertainties ∼3arcsec.
Note (2): Point sources well fitted by the PSF have PFP∼0.99, while sources
with PFP≲0.9 are not well fitted with the PSF so users may want to
re-measure with big apertures. Sources with PFP<0.85 are not tabulated.
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Byte-by-byte Description of file: mips160.dat
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Bytes Format Units Label Explanations
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2- 12 A11 --- --- [SWIRE1160]
13- 25 A13 --- SWIRE160 SWIRE 160um designation (Version 1.0)
28- 36 F9.5 deg RAdeg Right ascension in decimal degrees (J2000.0) (1)
39- 47 F9.5 deg DEdeg Declination in decimal degrees (J2000.0) (1)
50- 55 F6.1 mJy F160um 160um flux (Flux uncertainties ∼30%)
58- 63 F6.4 --- PFP PSF fitting parameter (correlation
coefficient) (2)
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Note (1): Positional uncertainties ∼8arcsec.
Note (2): Point sources well fitted by the PSF have PFP∼0.99, while sources
with PFP≲0.9 are not well fitted with the PSF so users may want to
re-measure with big apertures. Sources with PFP<0.85 are not tabulated.
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History: Copied on 25-Nov-2004 at
http://data.spitzer.caltech.edu/popular/swire/20041027_enhanced_v1_EN1
References:
Lonsdale et al., 2003PASP..115..897L 2003PASP..115..897L
Lonsdale et al., 2004ApJS..154...54L 2004ApJS..154...54L
(End) Patricia Vannier [CDS] 25-Nov-2004