J/ApJS/177/431 Mid-IR sources in EGS (Barmby+, 2008)
A catalog of mid-infrared sources in the Extended Groth Strip.
Barmby P., Huang J.-S., Ashby M.L.N., Eisenhardt P.R.M., Fazio G.G.,
Willner S.P., Wright E.L.
<Astrophys. J. Suppl. Ser., 177, 431-445 (2008)>
=2008ApJS..177..431B 2008ApJS..177..431B
ADC_Keywords: Infrared sources ; Photometry, infrared ; Surveys
Keywords: catalogs - galaxies: high-redshift - infrared: galaxies - surveys
Abstract:
The Extended Groth Strip (EGS) is one of the premier fields for
extragalactic deep surveys. Deep observations of the EGS with the
Infrared Array Camera (IRAC) on the Spitzer Space Telescope cover an
area of 0.38deg2 to a 50% completeness limit of 1.5uJy at 3.6um.
The catalog comprises 57434 objects detected at 3.6um, with 84%,
28%, and 24% also detected at 4.5, 5.8, and 8.0um, respectively.
Number counts are consistent with results from other Spitzer surveys.
Color distributions show that the EGS IRAC sources comprise a mixture
of populations: low-redshift star-forming galaxies, quiescent galaxies
dominated by stellar emission at a range of redshifts, and
high-redshift galaxies and AGNs.
Description:
The IRAC observations of the EGS were performed in two epochs, 2003
December and 2004 June/July.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 573 57434 Extended Groth Strip 3.6 micron selected catalog
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See also:
J/AJ/132/2159 : IRAC counterparts of 6cm galaxies in EGS (Willner+, 2006)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- --- [EGSIRAC]
9- 27 A19 --- EGSIRAC Source identification (Jhhmmss.ss+ddmmss.s)
29- 39 F11.7 deg RAdeg Right Ascension in decimal degrees (J2000) (1)
41- 50 F10.7 deg DEdeg Declination in decimal degrees (J2000) (1)
52- 56 F5.3 --- S/G [0,1] SExtractor 3.6um classification (2)
58- 59 I2 --- Flag SExtractor 3.6um image flags (3)
61- 62 I2 --- Cov Minimum 4-band coverage at source (4)
64- 71 F8.3 pix rad Radius containing 50% 3.6um enclosed flux
73- 81 F9.3 pix X3.6 Source 3.6um X pixel barycenter
83- 90 F8.3 pix Y3.6 Source 3.6um Y pixel barycenter
92- 95 I4 pix A3.6 ?=0 Isophotal 3.6um area (5)
97-103 F7.3 pix Rad3.6 ?=0 Kron 3.6um radius (6)
105-110 F6.3 pix Maj3.6 ?=0 Semi-major 3.6um axis
112-117 F6.3 pix Min3.6 ?=0 Semi-minor 3.6um axis
119-125 F7.3 deg PA3.6 [-90/90]? Position angle of 3.6um image (7)
127-132 F6.3 mag 3.6Kmag ?=0 Kron 3.6um AB magnitude
134-141 F8.3 mag e_3.6Kmag ?=0 Uncertainty in 3.6Kmag
143-148 F6.3 mag 3.6imag ?=0 3.6um AB magnitude in isophote (5)
150-154 F5.3 mag e_3.6imag ?=0 Uncertainty in imag3.6
156-161 F6.3 mag 3.6a1mag ?=0 1.53" aperture 3.6um AB magnitude (8)
163-168 F6.3 mag 3.6a2mag ?=0 2.14" aperture 3.6um AB magnitude (8)
170-175 F6.3 mag 3.6a3mag ?=0 3.06" aperture 3.6um AB magnitude (8)
177-181 F5.3 mag e_3.6a1mag ?=0 Uncertainty in 3.6a1mag
183-188 F6.3 mag e_3.6a2mag ?=0 Uncertainty in 3.6a2mag
190-202 F13.3 mag e_3.6a3mag ?=0 Uncertainty in 3.6a3mag
204-212 F9.3 pix X4.5 ?=0 Source 4.5um X pixel barycenter
214-221 F8.3 pix Y4.5 ?=0 Source 4.5um Y pixel barycenter
223-226 I4 pix A4.5 ?=0 Isophotal 4.5um area (5)
228-234 F7.3 pix Rad4.5 ?=0 Kron 4.5um radius (6)
236-241 F6.3 pix Maj4.5 ?=0 Semi-major 4.5um axis
243-248 F6.3 pix Min4.5 ?=0 Semi-minor 4.5um axis
250-256 F7.3 deg PA4.5 [-90/90]? Position angle of 4.5um image (7)
258-263 F6.3 mag 4.5Kmag ?=0 Kron 4.5um AB magnitude
265-271 F7.3 mag e_4.5Kmag ?=0 Uncertainty in 4.5Kmag
273-278 F6.3 mag 4.5imag ?=0 4.5um AB magnitude in isophote (5)
280-284 F5.3 mag e_4.5imag ?=0 Uncertainty in 4.5imag
286-291 F6.3 mag 4.5a1mag ?=0 1.53" aperture 4.5um AB magnitude (8)
293-298 F6.3 mag 4.5a2mag ?=0 2.14" aperture 4.5um AB magnitude (8)
300-305 F6.3 mag 4.5a3mag ?=0 3.06" aperture 4.5um AB magnitude (8)
307-311 F5.3 mag e_4.5a1mag ?=0 Uncertainty in 4.5a1mag
313-325 F13.3 mag e_4.5a2mag ?=0 Uncertainty in 4.5a2mag
327-339 F13.3 mag e_4.5a3mag ?=0 Uncertainty in 4.5a3mag
341-349 F9.3 pix X5.8 ?=0 Source 5.8um X pixel barycenter
351-358 F8.3 pix Y5.8 ?=0 Source 5.8um Y pixel barycenter
360-363 I4 pix A5.8 ?=0 Isophotal 5.8um area (5)
365-370 F6.3 pix Rad5.8 ?=0 Kron 5.8um radius (6)
372-376 F5.3 pix Maj5.8 ?=0 Semi-major 5.8um axis
378-382 F5.3 pix Min5.8 ?=0 Semi-minor 5.8um axis
384-390 F7.3 deg PA5.8 [-90/90]? Position angle of 5.8um image (7)
392-397 F6.3 mag 5.8Kmag ?=0 Kron 5.8um AB magnitude
399-404 F6.3 mag e_5.8Kmag ?=0 Uncertainty in 5.8Kmag
406-411 F6.3 mag 5.8imag ?=0 5.8um AB magnitude in isophote (5)
413-417 F5.3 mag e_5.8imag ?=0 Uncertainty in 5.8imag
419-424 F6.3 mag 5.8a1mag ?=0 1.53" aperture 5.8um AB magnitude (8)
426-431 F6.3 mag 5.8a2mag ?=0 2.14" aperture 5.8um AB magnitude (8)
433-438 F6.3 mag 5.8a3mag ?=0 3.06" aperture 5.8um AB magnitude (8)
440-444 F5.3 mag e_5.8a1mag ?=0 Uncertainty in 5.8a1mag
446-450 F5.3 mag e_5.8a2mag ?=0 Uncertainty in 5.8a2mag
452-456 F5.3 mag e_5.8a3mag ?=0 Uncertainty in 5.8a3mag
458-466 F9.3 pix X8.0 ?=0 Source 8.0um X pixel barycenter
468-475 F8.3 pix Y8.0 ?=0 Source 8.0um Y pixel barycenter
477-480 I4 pix A8.0 ?=0 Isophotal 8.0um area (5)
482-487 F6.3 pix Rad8.0 ?=0 Kron 8.0um radius (6)
489-493 F5.3 pix Maj8.0 ?=0 Semi-major 8.0um axis
495-499 F5.3 pix Min8.0 ?=0 Semi-minor 8.0um axis
501-507 F7.3 deg PA8.0 [-90/90]? Position angle of 8.0um image (7)
509-514 F6.3 mag 8.0Kmag ?=0 Kron 8.0um AB magnitude
516-521 F6.3 mag e_8.0Kmag ?=0 Uncertainty in 8.0Kmag
523-528 F6.3 mag 8.0imag ?=0 8.0um AB magnitude in isophote (5)
530-534 F5.3 mag e_8.0imag ?=0 Uncertainty in 8.0imag
536-541 F6.3 mag 8.0a1mag ?=0 1.53" aperture 8.0um AB magnitude (8)
543-548 F6.3 mag 8.0a2mag ?=0 2.14" aperture 8.0um AB magnitude (8)
550-555 F6.3 mag 8.0a3mag ?=0 3.06" aperture 8.0um AB magnitude (8)
557-561 F5.3 mag e_8.0a1mag ?=0 Uncertainty in 8.0a1mag
563-567 F5.3 mag e_8.0a2mag ?=0 Uncertainty in 8.0a2mag
569-573 F5.3 mag e_8.0a3mag ?=0 Uncertainty in 8.0a3mag
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Note (1): SExtractor's `windowed' parameters for image location and shape
(e.g., ALPHAWIN_IMAGE, AWIN_IMAGE) are used because the extensive
comparison by Becker et al. (2007PASP..119.1462B 2007PASP..119.1462B) showed that these
were superior to the older `isophotal' measurements
(e.g., ALPHA_J2000, A_IMAGE).
Note (2): 0 = non-stellar, 1 = stellar
Note (3): The bitwise sum of values. Flag as follows:
1 = object has near neighbors or bad pixels;
2 = object was originally blended with another one.
Note (4): Minimum was computed as min(C(3.6),C(4.5),C(5.8),C(8.0)/4)
where C(λ) is the number of frames combined in band λ
at the object location.
Note (5): Above detection threshold.
Note (6): SExtractor outputs this parameter in units of semi-major axis;
the value given here is multiplied by A_IMAGE to convert to pixels.
Note (7): east of north.
Note (8): The aperture radii of 1.53", 2.14", 3.06" correspond to
pixel radii of 2.5, 3.5, 3.06 pixels, respectively.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 16-Jul-2009