J/ApJS/200/8 AGES: the AGN and Galaxy Evolution Survey (Kochanek+, 2012)
AGES: the AGN and Galaxy Evolution Survey.
Kochanek C.S., Eisenstein D.J., Cool R.J., Caldwell N., Assef R.J.,
Jannuzi B.T., Jones C., Murray S.S., Forman W.R., Dey A., Brown M.J.I.,
Eisenhardt P., Gonzalez A.H., Green P., Stern D.
<Astrophys. J. Suppl. Ser., 200, 8 (2012)>
=2012ApJS..200....8K 2012ApJS..200....8K
ADC_Keywords: Active gal. nuclei ; Galaxies, IR ; Photometry, infrared ;
Photometry, ultraviolet ; Redshifts ; QSOs ; Surveys
Keywords: cosmology: observations - galaxies: evolution - galaxies: general -
quasars: general
Abstract:
The AGN and Galaxy Evolution Survey (AGES) is a redshift survey
covering, in its standard fields, 7.7deg2 of the Bootes field of the
NOAO Deep Wide-Field Survey. The final sample consists of 23745
redshifts. There are well-defined galaxy samples in 10 bands (the
BW, R, I, J, K, IRAC 3.6, 4.5, 5.8, and 8.0um, and MIPS 24um bands)
to a limiting magnitude of I<20mag for spectroscopy. For these
galaxies, we obtained 18163 redshifts from a sample of 35200 galaxies,
where random sparse sampling was used to define statistically complete
sub-samples in all 10 photometric bands. The median galaxy redshift is
0.31, and 90% of the redshifts are in the range 0.085<z<0.66. Active
galactic nuclei (AGNs) were selected as radio, X-ray, IRAC mid-IR, and
MIPS 24um sources to fainter limiting magnitudes (I<22.5mag for point
sources). Redshifts were obtained for 4764 quasars and galaxies with
AGN signatures, with 2926, 1718, 605, 119, and 13 above redshifts of
0.5, 1, 2, 3, and 4, respectively. We detail all the AGES selection
procedures and present the complete spectroscopic redshift catalogs
and spectral energy distribution decompositions. Photometric redshift
estimates are provided for all sources in the AGES samples.
Description:
The observations were made with Hectospec, a 300 fiber, 1 degree field
of view, robotic spectrograph for the 6.5m MMT telescope at Mt.
Hopkins, from 2004 April to 2007 July. The wavelength range is
3700-9200Å with a pixel scale of 1.2Å and a spectral resolution
of 6Å (i.e., roughly R∼1000).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 85 133 The spectroscopic observations
table5.dat 61 40810 *Summary of selection codes and flags
table6.dat 103 40810 Magnitudes and fluxes
table7.dat 91 40810 Redshifts
table8.dat 72 40810 Photometric redshifts
table9.dat 53 40810 Completeness and K-corrections for the galaxy
samples
codes.dat 283 33 Sample selection binary code explanations
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Note on table5.dat : Because we select objects using a very broad range of
criteria, the targets are assigned binary selection codes reported as decimal
numbers for compactness. For example, in Table 5, Code05 have 20 selection
criteria. Each selection criterion is assigned a binary number 2n ranging
from 20=1 for SDSS calibration stars to 219=524288 for the main I-band
galaxy sample. The overall code for a target is then the sum of all its
selection codes. For example, an object with code number 96=32+64=25+26
is an AGN candidate selected both as an MIPS point source (code 32) and as an
IRAC mid-IR (code 64) candidate.
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See also:
J/ApJ/713/970 : Low-resolution SED templates for AGNs and galaxies (Assef+,
2010)
J/ApJ/639/816 : The FLAMINGOS Extragalactic Survey (Elston+, 2006)
J/ApJ/641/140 : Optical counterparts in the NDWFS Bootes field (Brand+, 2006)
J/ApJS/161/9 : X-ray survey of the NDWFS Bootes field (Kenter+, 2005)
J/ApJ/634/L1 : 16µm sources in the NOAO Bootes field (Kasliwal+, 2005)
http://www.noao.edu/noao/noaodeep/DR3/dr3-data.html : NDWFS DR3 data
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Pass [0/950] Pass number
4 A1 --- f_Pass [C] C: Co-added spectra
6- 7 I2 --- Field [0/15]? Closest field center (1)
8 A1 --- f_Field [S] S: Spectra from the SDSS survey
10- 19 A10 "YYYY/MM/DD" Date Observation date
21- 22 I2 h RAh ? Pointing hour of right ascension (J2000)
24- 25 I2 min RAm ? Minute of right ascension (J2000)
27- 31 F5.2 s RAs ? Second of right ascension (J2000)
33 A1 --- DE- ? Pointing sign of declination (J2000)
34- 35 I2 deg DEd ? Pointing degree of declination (J2000)
37- 38 I2 arcmin DEm ? Arcminute of declination (J2000)
40- 44 F5.2 arcsec DEs ? Arcsecond of declination (J2000)
46 I1 --- N ? Number of exposure(s)
48- 52 I5 s Exp ? Total exposure time
54- 57 I4 --- Nspec Number of object spectra
59- 63 F5.2 --- Airmass ? Air mass near the middle of the exposures
65- 69 F5.2 --- S/N ? Mean S/N of the object spectra
71- 85 A15 --- Note Comments
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Note (1): Standard sub-field centers (as in table 1):
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Field RA DEC Sample Spectra Redshifts Completeness
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1 216.750000 35.365000 774 772 753 97.3%
2 216.666667 34.578889 751 750 731 97.3%
3 216.766667 33.838333 729 723 710 97.4%
4 216.629167 33.121389 911 902 861 94.5%
5 217.404167 35.402500 688 667 633 92.0%
6 217.416667 34.591389 574 572 566 98.6%
7 217.441667 33.990833 551 546 529 96.0%
8 217.454167 33.283889 865 861 839 97.0%
9 218.245833 35.326667 652 631 602 92.3%
10 218.133333 34.712222 728 720 686 94.2%
11 218.225000 33.922500 614 612 603 98.2%
12 218.395833 33.411389 785 766 749 95.4%
13 219.020833 35.464167 786 717 697 88.7%
14 218.895833 34.618056 748 664 636 88.8%
15 219.091667 33.860833 855 737 711 83.2%
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Number of main I-band (code06=524288) galaxies in the field, the
number for which spectra were obtained, the number of successful
redshift measurements and the resulting completeness.
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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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2- 11 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
13- 21 F9.6 deg DEdeg Declination in decimal degrees (J2000)
23- 29 I7 --- Code06 [-786176/786384] The 06/07 period sample selection
code (1)
31- 36 I6 --- Code05 ?=-1 The 05 period sample selection code (1)
38- 42 I5 --- Code04 ?=-1 The 04 period sample selection code (1)
44- 45 I2 --- rcode [0/19] Random sample code (2)
47- 48 I2 --- field [0/15] Sub-field number; 0=outside standard field
50 I1 --- b* [0/1] Near bright USNO star code: 1=yes
52 I1 --- irac [0/5] IRAC AGN selection sub code in 06/07 season
54 I1 --- gal [0/1] Source counted as a galaxy target: 1=yes
56 I1 --- qso [0/1] Source counted as an AGN target: 1=yes
58 I1 --- ps [0/1] Source counted as a point source: 1=yes
60- 61 I2 --- agn [0/1] Source counted as a faint, I>20mag,
extended AGN candidate: 1=yes
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Note (1): Codes are a combination of binary codes defined in codes.dat file.
In Code06, a negative value of the code is reported in 340 cases
likely to be semi-saturated stars.
Note (2): With each index representing a randomly selected 5% of the sources.
See section 2.2 for further details.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 4 I4 ct Xct ?=-10 XBootes X-ray counts (4)
6- 11 F6.2 mag FUV ?=-10 GALEX/FUV band AB magnitude (5)
13- 18 F6.2 mag NUV ?=-10 GALEX/NUV band AB magnitude (5)
20- 25 F6.2 mag BWmag ?=-10 NDWFS DR3 BW band Vega magnitude (6)
27- 32 F6.2 mag Rmag ?=-10 NDWFS DR3 R band Vega magnitude (6)
34- 39 F6.2 mag Imag ?=-10 NDWFS DR3 I band Vega magnitude (6)
41- 46 F6.2 mag zmag ?=-10 z' band AB magnitude (7)
48- 53 F6.2 mag Jmag ?=-10 FLAMEX J band Vega magnitude (8)
55- 60 F6.2 mag K1mag ?=-10 FLAMEX K1 band Vega magnitude (8)
62- 67 F6.2 mag K2mag ?=-10 NDWFS DR3 K2 band Vega magnitude (6)
69- 74 F6.2 mag [3.6] ?=-10 Spitzer/IRAC 3.6um band Vega magnitude (9)
76- 81 F6.2 mag [4.5] ?=-10 Spitzer/IRAC 4.5um band Vega magnitude (9)
83- 88 F6.2 mag [5.8] ?=-10 Spitzer/IRAC 5.8um band Vega magnitude (9)
90- 95 F6.2 mag [8.0] ?=-10 Spitzer/IRAC 8um band Vega magnitude (9)
97-103 F7.3 mJy F24 ?=-10 Spitzer/MIPS 24 micron flux density (10)
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Note (4): Murray et al. (2005ApJS..161....1M 2005ApJS..161....1M), Kenter et al. (2005,
Cat. J/ApJS/161/9), and Brand et al. (2006, Cat. J/ApJ/641/140).
A "-10" indicates no data or below the survey limit.
Note (5): Martin et al. (2005ApJ...619L...1M 2005ApJ...619L...1M). A "-10" indicates no data or
below the survey limit.
Note (6): Jannuzi & Dey (1999ASPC..193..258J 1999ASPC..193..258J). A "-10" indicates no data or
below the survey limit.
Note (7): Cool (2007ApJS..169...21C 2007ApJS..169...21C). A "-10" indicates no data or below the
survey limit.
Note (8): Elston et al. (2006, Cat. J/ApJ/639/816). A "-10" indicates no data or
below the survey limit.
Note (9): From the IRAC Shallow Survey (Eisenhardt et al. 2004ApJS..154...48E 2004ApJS..154...48E).
A "-10" indicates no data or below the survey limit.
Note (10): Soifer & Spitzer/NOAO Team (2004AAS...204.4805S 2004AAS...204.4805S). A "-10" indicates
no data or below the survey limit.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
12- 20 F9.6 deg DEdeg Declination in decimal degrees (J2000)
22 I1 --- N [0/7] Number of spectra taken (11)
24- 29 F6.3 --- z1 ? Spectrum 1 redshift (12)
31- 37 F7.3 --- S/N1 ? Spectrum 1 signal-to-noise ratio
39- 41 I3 --- Pass1 [0/950]? Spectrum 1 pass code (13)
43- 45 I3 --- ap1 [1/700]? Spectrum 1 aperture code (14)
47- 52 F6.3 --- z2 ? Spectrum 2 redshift (12)
54- 60 F7.3 --- S/N2 ? Spectrum 2 signal-to-noise ratio
62- 64 I3 --- Pass2 [0/950]? Spectrum 2 pass code (13)
66- 68 I3 --- ap2 [1/700]? Spectrum 2 aperture code (14)
70- 75 F6.3 --- z3 ? Spectrum 3 redshift (12)
77- 83 F7.3 --- S/N3 ? Spectrum 3 signal-to-noise ratio
85- 87 I3 --- Pass3 [0/950]? Spectrum 3 pass code (13)
89- 91 I3 --- ap3 [1/694]? Spectrum 3 aperture code (14)
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Note (11): Up to the first 3 spectra in order of decreasing S/N.
Note (12): Pipeline redshifts that did not pass visual inspection are
reported as -1-z, where z was the pipeline redshift estimate.
Note (13): Observations are described by a three digit pass number ABB
where, in general, A indicates the sequential pass over the fields and
BB indicates the field. So, pass 203 would be the second pointing at
sub-field 3.
Note (14): Explanation in section 4 according to the datafile, but not
supplied in the published paper.
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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2- 11 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
13- 21 F9.6 deg DEdeg Declination in decimal degrees (J2000)
24- 25 I2 --- Nb ? Number of bands used to derive zph
27- 30 F4.2 --- zph ? Photometric redshift (15)
31 A1 --- --- [0]
33- 39 F7.3 --- chi2 ? The χ2 goodness of fit at zph
41- 46 F6.3 10+10Lsun E ? E template SED contribution (16)
48- 53 F6.3 10+10Lsun Sbc ? Sbc template SED contribution (16)
55- 60 F6.3 10+10Lsun Im ? Im template SED contribution (16)
62- 66 F5.3 10+10Lsun AGN ? AGN template SED contribution (16)
68- 72 F5.3 mag E(B-V) ? Extinction applied to AGN template
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Note (15): Following Assef et al. (2010, Cat. J/ApJ/713/970).
Note (16): The SED is fit as a combination of an early-type, late-type,
star forming, and (obscured) AGNs for the full range of available
UV/optical/near-IR/far-IR photometry, and we report the luminosities
associated with each component. By definition the contributions are
always ≥0, and they are calculated for the spectroscopic redshift
if it is known. The AGN luminosity is only calculated redward of the
Lyman limit.
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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2- 11 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
13- 21 F9.6 deg DEdeg Declination in decimal degrees (J2000)
23- 27 F5.3 --- Spec ? Spec completeness correction factor (17)
29- 33 F5.3 --- Sparse ? Sparse completeness correction factor (18)
35- 39 F5.3 --- Fiber ? Fiber completeness correction factor (19)
41- 45 F5.3 --- zmax ? Maximum redshift (20)
47- 53 F7.3 10+6Mpc3 Vmax ? Maximum volume (21)
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Note (17): Corrects for the failure to determine a redshift when a spectrum
was obtained.
Note (18): Corrects for the target sparse sampling weighting. The sparse
sampling weights are non-zero only for galaxies in the main statistical
samples, meaning sources in one of the 15 standard fields with at least
one galaxy selection code other than "Other I-band" (262144). The sparse
sampling weight is then simply the inverse of the largest sampling
rate used for any of the valid selection codes (100%, 30% or 20%).
Note (19): Corrects for how the local target density affects the assignment
of fibers.
Note (20): At which the source would have included the target.
Note (21): In units of 106h-3Mpc3 for an Ω=0.3, Λ=0.7
cosmological model and the survey area of 7.60deg2 used by Cool et
al. (2012ApJ...748...10C 2012ApJ...748...10C). These are calculated using kcorrect v4_2
(Blanton & Roweis 2007AJ....133..734B 2007AJ....133..734B) based on the BW RI photometry
and reported for all galaxies with redshift measurements.
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Byte-by-byte Description of file: codes.dat
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Bytes Format Units Label Explanations
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1- 36 A36 --- Criterion Selection criterion
38- 42 I5 --- Code04 ? 2004 sample selection binary code
44- 49 I6 --- Code05 ? 2005 sample selection binary code
52- 57 I6 --- Code06 ? 2006 and 2007 sample selection binary code
59-283 A225 --- Comm Explanation of the criterion
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 30-Jul-2012