J/ApJ/756/72 IRAC identifications for 510 AEGIS20 radio sources (Willner+, 2012)
A fully identified sample of AEGIS20 microjansky radio sources.
Willner S.P., Ashby M.L.N., Barmby P., Chapman S.C., Coil A.L.,
Cooper M.C., Huang J.-S., Ivison R., Koo D.C.
<Astrophys. J., 756, 72 (2012)>
=2012ApJ...756...72W 2012ApJ...756...72W
ADC_Keywords: Active gal. nuclei ; Photometry, infrared ; Radio continuum ;
Redshifts ; Photometry, RI ; Cross identifications ; Surveys
Keywords: galaxies: active; galaxies: high-redshift; galaxies: photometry;
infrared: galaxies; radio continuum: galaxies
Abstract:
Infrared 3.6-8µm images of the Extended Groth Strip yield plausible
counterpart identifications for all but one of 510 radio sources in
the AEGIS20 S(1.4GHz)>50µJy sample. This is the first such deep
sample that has been effectively 100% identified. Achieving the same
identification rate at R band would require observations reaching
RAB>27. Spectroscopic redshifts are available for 46% of the sample
and photometric redshifts for an additional 47%. Almost all of the
sources with 3.6µm AB magnitudes brighter than 19 have
spectroscopic redshifts z<1.1, while fainter objects predominantly
have photometric redshifts with 1≲z≲3. Unlike more powerful radio
sources that are hosted by galaxies having large stellar masses within
a relatively narrow range, the AEGIS20 counterparts have stellar
masses spanning more than a factor of 10 at z∼1. The sources are
roughly 10%-15% starbursts at z≲0.5 and 20%-25% active galactic
nuclei mostly at z>1 with the remainder of uncertain nature.
Description:
The initial radio catalog (Ivison et al. 2007ApJ...660L..77I 2007ApJ...660L..77I) contains
1122 sources with S(1.4GHz)>50µJy. Of these, 511 are in the area of
IRAC coverage, defined by at least five independent images in each of
the four IRAC channels. These 511 radio positions, within an area of
∼950arcmin2, are the ones we have attempted to match to IRAC
sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 511 20cm radio sources with IRAC coverage
table3.dat 123 511 IRAC counterparts of EGS 20cm radio sources
table4.dat 59 511 R magnitudes and redshifts of radio source
counterparts
table5.dat 50 511 (Spitzer) IRAC magnitudes
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See also:
III/268 : DEEP2 Redshift Survey, Data Release 4 (Matthews+ 2013)
II/317 : The CFHTLS Survey (T0007 release) (Hudelot+ 2012)
II/301 : The DEEP2-DR1 Photometric Catalog (Coil+ 2004)
J/ApJ/735/86 : NEWFIRM MBS: photometric catalogs (Whitaker+, 2011)
J/ApJS/193/30 : UV-to-FIR analysis of sources in the EGS. II. (Barro+, 2011)
J/ApJS/193/14 : DEEP3 Galaxy Redshift Survey: GOODS-N field (Cooper+, 2011)
J/ApJS/193/13 : Spitzer/IRAC sources in the EGS I. SEDs (Barro+, 2011)
J/A+A/526/A72 : Early-type galaxies in the EGS (Fernandez Lorenzo+, 2011)
J/ApJ/717/1181 : Spitzer power-law galaxies in EGS (Park+, 2010)
J/AJ/137/179 : AGNs in the EGS Survey (Ramos Almeida+, 2009)
J/ApJS/180/102 : AEGIS-X: Chandra deep survey (Laird+, 2009)
J/ApJS/177/431 : Mid-IR sources in EGS (Barmby+, 2008)
J/MNRAS/382/109 : Massive galaxies in Extended Groth Strip (Trujillo+, 2007)
J/ApJ/642/126 : MIR observations in the extended Groth strip (Barmby+, 2006)
J/AJ/132/2159 : IRAC counterparts of 6cm galaxies in EGS (Willner+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I03 --- Seq [1/511] Running sequence number
5- 23 A19 --- AEGIS20 AEGIS20 identifier (JHHMMSS.ss+DDMMSS.s)
25- 30 F6.3 mJy Sp [0.04/61.62] 20cm flux density
32- 36 F5.3 mJy e_Sp [0.009/0.04] The 1σ uncertainty in Sp
38- 44 F7.3 mJy Sint [0.04/135.4] Integrated 20 cm flux density
46- 51 F6.3 mJy e_Sint [-1/0.2] The 1σ uncertainty in Sint (1)
53- 56 F4.1 arcsec a [0/79] Major axis (2)
58- 61 F4.1 arcsec b [-1/6.5]? Minor axis (2)
63- 67 F5.1 deg PA [0/180] Position Angle
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Note (1): A value of -1 in the integrated uncertainty indicates that the
source was poorly fit by a Gaussian. In these cases, integrated flux
density was measured in a polygon that included the entire source, and
minor axis sizes are not given.
Note (2): A value of -1 indicates a radio source well fit by a pair of
Gaussians. In these cases, major size is the separation between
components.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I03 --- Seq [1/511] Running source number (G2)
4 A1 --- m_Seq [ENSW] Component identification
6- 14 F9.5 deg RAdeg Right Ascension of IRAC source (J2000)
16- 23 F8.5 deg DEdeg Declination of IRAC source (J2000)
25- 43 A19 --- EGSIRAC EGSIRAC identifier (1)
45- 47 F3.1 arcsec off.r [0/8.5] Radial offset from IRAC to radio
position (1)
49- 50 I2 --- Exp [2/68] Minimum number of useful images (2)
52- 59 A8 --- IRAC ? Source name in Rainbow database (3)
61- 64 F4.2 arcsec off.d ? Radial offset from IRAC to Rainbow database
66-123 A58 --- Com Additional comments
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Note (1): Where a source name is shown, IRAC names and positions are from
the published catalog (Barmby et al. 2008, Cat. J/ApJS/177/431). For
counterparts not in the published catalog, source positions were
measured on the published images.
Note (2): Number of useful images in whichever IRAC wavelength has the
fewest in units of 200s (one image at 3.6-5.8 micron; 4 images at 8.0
micron; see Barmby et al. (2008, Cat. J/ApJS/177/431).
Note (3): Barro et al. (2011, Cat. J/ApJS/193/13; <[BPG2011] iracNNNNNN> or
<[BPG2011] iracNNNNNN N> in Simbad).
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I03 --- Seq [1/511] Running sequence number (G2)
4 A1 --- m_Seq [ENSW] Component identification
6- 14 F9.5 deg RARdeg ? Right Ascension of R-band counterpart (5)
16- 23 F8.5 deg DERdeg ? Declination of R-band counterpart (5)
25- 28 F4.2 arcsec off.R [0.03/1]? Distance from R to IRAC position of
counterpart
30 I1 --- mtR [1/7] Red-band magnitude type (G1)
32- 36 F5.2 mag Rmag [15/27]? SExtractor R band AB magnitude
38- 42 F5.2 mag e_Rmag [-5/0.4]? Uncertainty in Rmag (6)
44- 49 F6.4 --- z [0.001/3.8]? Redshift
51 I1 --- r_z [1/9]?=0 Source of z (7)
53- 59 E7.1 W/Hz Lum ? The 3GHz luminosity
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Note (5): J2000 position of counterpart if measured independently on R image.
Note (6): Magnitude uncertainties given here are statistical only, estimated
from sky fluctuations. See text for discussion of systematic uncertainties.
"-5" indicates magnitude given is 5σ upper limit.
Note (7): In priority order if more than one redshifts exists as follows:
1 = DEEP3 (Cooper et al. 2011, Cat. J/ApJS/193/14; 2012MNRAS.419.3018C 2012MNRAS.419.3018C);
2 = DEEP2 (Davis et al. 2003SPIE.4834..161D 2003SPIE.4834..161D,
Newman et al. 2013ApJS..208....5N 2013ApJS..208....5N, http://deep.berkeley.edu/DR3/);
3 = MMT Hectospec (Coil et al. 2009ApJ...701.1484C 2009ApJ...701.1484C);
4 = Spitzer/IRS (Huang et al. 2009ApJ...700..183H 2009ApJ...700..183H,2013ApJ...766...21H 2013ApJ...766...21H);
5 = spectroscopic redshift from Rainbow (Barro et al. 2011,
Cat. J/ApJS/193/13);
6 = photometric redshift from NMBS (Whitaker et al. 2011, Cat. J/ApJ/735/86);
7 = photometric redshift from CFHTLS (Coupon et al. 2009A&A...500..981C 2009A&A...500..981C:
http://terapix.iap.fr/cplt/CFHTLS_deep_ugriz_T0004_zphot_1.4.tgz);
8 = photometric redshift from (Huang et al. 2013ApJ...766...21H 2013ApJ...766...21H);
9 = photometric redshift from Rainbow (Barro et al. 2011, Cat. J/ApJS/193/13).
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I03 --- Seq [1/511] Running sequence number (G2)
4 A1 --- m_Seq [ENSW] Component identification
6 I1 --- mtI [1/7] IRAC magnitude type (G1)
8- 12 F5.2 mag [3.6] Spitzer/IRAC 3.6 micron band AB magnitude
14- 17 F4.2 mag e_[3.6] Uncertainty in [3.6] (4)
19- 23 F5.2 mag [4.5] Spitzer/IRAC 4.5 micron band AB magnitude
25- 28 F4.2 mag e_[4.5] Uncertainty in [4.5] (4)
30- 34 F5.2 mag [5.8] ? Spitzer/IRAC 5.8 micron band AB magnitude
36- 39 F4.2 mag e_[5.8] ? Uncertainty in [5.8] (4)
41- 45 F5.2 mag [8.0] ? Spitzer/IRAC 8.0 micron band AB magnitude
47- 50 F4.2 mag e_[8.0] ? Uncertainty in [8.0] (4)
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Note (4): Uncertainty is statistical only and is based on fluctuations in
the nearby sky. It is shown as 0.00 when less than 0.005mag, but see
text for discussion of systematic errors.
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Global notes:
Note (G1): Magnitude type as follows:
1 = SExtractor aperture magnitude in 1.53" radius;
2 = SExtractor aperture magnitude in 2.14" radius;
3 = SExtractor aperture magnitude in 3.06" radius;
4 = magnitude in Kron aperture as measured by SExtractor,
5 = apphot magnitude with 1.53" radius measured at R position if available
otherwise IRAC position;
6 = apphot magnitude with 2.14" radius measured at R position if available
otherwise IRAC position;
7 = apphot magnitude with 3.06" radius measured at R position if available
otherwise IRAC position; magnitudes are in AB.
Note (G2): 3 radio sources have no IRAC identification:
002 = J141736.35+523135.8: Radio source is hot spot in jet from 003
434 = J142213.25+532817.5: Radio source <5σ, nearest IRAC source is
1.6arcsec away
488 = J142306.17+533351.8: near a saturated star
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 24-Mar-2014