J/ApJS/220/10 AEGIS-X Deep survey of EGS (AEGIS-XD) (Nandra+, 2015)
AEGIS-X: deep Chandra imaging of the central Groth Strip.
Nandra K., Laird E.S., Aird J.A., Salvato M., Georgakakis A., Barro G.,
Perez-Gonzalez P.G., Barmby P., Chary R.-R., Coil A., Cooper M.C.,
Davis M., Dickinson M., Faber S.M., Fazio G.G., Guhathakurta P., Gwyn S.,
Hsu L.-T., Huang J.-S., Ivison R.J., Koo D.C., Newman J.A., Rangel C.,
Yamada T., Willmer C.
<Astrophys. J. Suppl. Ser., 220, 10 (2015)>
=2015ApJS..220...10N 2015ApJS..220...10N (SIMBAD/NED BibCode)
ADC_Keywords: X-ray sources ; Surveys ; Photometry, ugriz ; Redshifts
Photometry, infrared ; Photometry, ultraviolet
Keywords: galaxies: active; galaxies: nuclei; surveys
Abstract:
We present the results of deep Chandra imaging of the central region
of the Extended Groth Strip, the AEGIS-X Deep (AEGIS-XD) survey. When
combined with previous Chandra observations of a wider area of the
strip, AEGIS-X Wide (AEGIS-XW), these provide data to a nominal
exposure depth of 800ks in the three central ACIS-I fields, a region
of approximately 0.29deg2. This is currently the third deepest X-ray
survey in existence; a factor ∼2-3 shallower than the Chandra Deep
Fields (CDFs), but over an area ∼3 times greater than each CDF. We
present a catalog of 937 point sources detected in the deep Chandra
observations, along with identifications of our X-ray sources from
deep ground-based, Spitzer, GALEX, and Hubble Space Telescope imaging.
Using a likelihood ratio analysis, we associate multiband counterparts
for 929/937 of our X-ray sources, with an estimated 95% reliability,
making the identification completeness approximately 94% in a
statistical sense. Reliable spectroscopic redshifts for 353 of our
X-ray sources are available predominantly from Keck (DEEP2/3) and MMT
Hectospec, so the current spectroscopic completeness is ∼38%. For the
remainder of the X-ray sources, we compute photometric redshifts based
on multiband photometry in up to 35 bands from the UV to mid-IR.
Particular attention is given to the fact that the vast majority the
X-ray sources are active galactic nuclei and require hybrid templates.
Our photometric redshifts have mean accuracy of σ=0.04 and an
outlier fraction of approximately 5%, reaching σ=0.03 with less
than 4% outliers in the area covered by CANDELS.
Description:
The new AEGIS-XD Chandra data were taken at three nominal pointing
positions, which we have designated AEGIS-1, AEGIS-2, and AEGIS-3.
These observations were all taken in the time period 2007 December 11
to 2009 June 26 using the ACIS-I instrument.
The centers of the 3 AEGIS fields correspond fairly closely to those
of the EGS-3, EGS-4, and EGS-5 fields of Laird+, 2009, J/ApJS/180/102
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table11.dat 114 937 Chandra AEGIS-XD source catalog: basic source
properties
table12.dat 108 937 Chandra AEGIS-XD source catalog: source fluxes
and HRs
table13.dat 84 937 Optical and IR counterparts to the AEGIS-X sources
table14.dat 535 937 AEGIS-XD photometric catalog
table15.dat 95 937 AEGIS-XD redshift catalog
--------------------------------------------------------------------------------
See also:
III/268 : DEEP2 Redshift Survey, Data Release 4 (Matthews+ 2013)
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
VII/225 : The Canada-France Redshift Survey (CFRS) (Lilly+, 1995)
J/ApJ/802/89 : Luminosity function of X-ray-selected AGNs (Buchner+, 2015)
J/MNRAS/443/1999 : X-ray spectral analysis of AGNs (Brightman+, 2014)
J/ApJ/765/117 : X-ray group of galaxies in AEGIS (Erfanianfar+, 2013)
J/MNRAS/428/3089 : X-ray properties of BzK-selected galaxies (Rangel+, 2013)
J/ApJS/202/6 : XDEEP2 survey catalog (Goulding+, 2012)
J/ApJS/201/30 : The Chandra COSMOS survey. III. (Civano+, 2012)
J/ApJS/198/1 : Photometry catalogs for the Lockman Hole (Fotopoulou+, 2012)
J/ApJ/742/61 : Phot. redshift of AGNs from XMM- & C-COSMOS (Salvato+ 2011)
J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011)
J/ApJ/735/86 : NEWFIRM MBS: photometric catalogs (Whitaker+, 2011)
J/ApJ/728/38 : AEGIS: demographics of X-ray and optical AGN (Yan+, 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/ApJS/189/270 : MUSYC optical imaging in ECDF-S (Cardamone+, 2010)
J/ApJS/187/560 : Photometric redshifts of the 2Ms CDF-S (Luo+, 2010)
J/ApJS/184/158 : Chandra COSMOS survey I. (Elvis+, 2009)
J/ApJS/180/102 : AEGIS-X: Chandra deep survey (Laird+, 2009)
J/ApJS/179/1 : The OPTX project: CLANS, CLASXS and CDF-N (Trouille+, 2008)
J/ApJS/177/431 : Mid-IR sources in EGS (Barmby+, 2008)
J/ApJ/680/130 : Mid-IR colors of AGNs in the MUSYC ECDF-S (Cardamone+, 2008)
J/ApJ/675/234 : Stellar mass functions for galaxies (Perez-Gonzalez+, 2008)
J/MNRAS/382/279 : XMM-LSS catalogue. Version I. (Pierre+, 2007)
J/ApJ/669/765 : Chandra X-ray sources in LALA Cetus field (Wang+, 2007)
J/ApJS/172/29 : XMM-Newton survey in COSMOS field. I. (Hasinger+, 2007)
J/ApJS/169/401 : ChaMP X-ray point source catalog (Kim+, 2007)
J/ApJ/642/126 : MIR observations in the extended Groth strip (Barmby+, 2006)
J/A+A/451/457 : X-ray properties of AGN in CDFS (Tozzi+, 2006)
J/ApJS/161/9 : X-ray survey of the NDWFS Bootes field (Kenter+, 2005)
J/MNRAS/356/568 : Deep Chandra survey of the Groth Strip (Nandra+, 2005)
J/ApJS/155/271 : CDF-South: Optical spectroscopy (Szokoly+, 2004)
J/AJ/128/1501 : CLASXS: X-ray catalog (Yang+, 2004)
J/ApJ/592/728 : Lyman break galaxies at redshift z∼3 (Steidel+, 2003)
J/AJ/126/632 : UBVRIz'HK' phot. of 2Ms CDFN X-ray sources (Barger+, 2003)
J/AJ/126/539 : The Chandra Deep Fields North and South (Alexander+, 2003)
J/A+A/398/901 : VLA survey at 6 cm in the Lockman Hole (Ciliegi+, 2003)
J/ApJS/139/369 : Chandra Deep Field South. 1 Ms catalog (Giacconi+, 2002)
J/ApJ/554/742 : Chandra Deep Survey of the HDF-N (Hornschemeier+, 2001)
http://www.mpe.mpg.de/XraySurveys/ : X-ray Surveys at MPE
http://rainbowx.fis.ucm.es/Rainbow_Database : Rainbow database
Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [aegis_]
7- 9 I3 --- XID [001/937] AEGIS X-ray Object ID
11- 29 A19 --- AEGISXD Object IAU name (JHHMMSS.ss+DDMMSS.s)
31- 40 F10.6 deg RAdeg X-ray Right Ascension in decimal degrees (J2000)
42- 50 F9.6 deg DEdeg X-ray Declination in decimal degrees (J2000)
52- 55 F4.2 arcsec ePos [0.1/1.4] X-ray positional error
57- 61 F5.2 deg OAA Off-axis angle
63- 67 I5 ct Fcts Full (0.5-7keV) band, total counts (1)
69- 74 F6.2 ct Fbkg Full (0.5-7keV) band, background cts (2)
76- 79 I4 ct Scts Soft (0.5-2keV) band, total counts (1)
81- 85 F5.2 ct Sbkg Soft (0.5-2keV) band, background cts (2)
87- 90 I4 ct Hcts Hard (2-7keV) band, total counts (1)
92- 97 F6.2 ct Hbkg Hard (2-7keV) band, background cts (2)
99-102 I4 ct Ucts Ultra hard (4-7keV) band, total counts (1)
104-109 F6.2 ct Ubkg Ultra hard (4-7keV) band, background cts (2)
111-114 A4 --- Band Band(s) in which source is detected (3)
--------------------------------------------------------------------------------
Note (1): Counts extracted at the source position within the 90% EEF radius.
Note (2): Background scaled to the area that corresponds to the 90% EEF radius.
Note (3): Spectral bands that the source is detected with Poisson
background fluctuation probability <4e-6 (F = Full band;
S = Soft band; H = Hard band; U = Ultra hard band).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table12.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [aegis_]
7- 9 I3 --- XID [001/937] AEGIS X-ray Object ID
11- 17 F7.3 10-18W/m2 FBBay [0/283.1] Full band (0.5-10keV) flux (4)
19- 23 F5.3 10-18W/m2 E_FBBay [0.05/3]? Upper 1σ error in FBBay (4)
25- 29 F5.3 10-18W/m2 e_FBBay [0/2.8]? Lower 1σ error in FBBay (4)
31- 36 F6.3 10-18W/m2 SBBay [0/93.1] Soft band (0.5-2keV) flux (4)
38- 42 F5.3 10-18W/m2 E_SBBay [0.01/1.1]? Upper 1σ error in SBBay (4)
44- 48 F5.3 10-18W/m2 e_SBBay [0/1.1]? Lower 1σ error in SBBay (4)
50- 56 F7.3 10-18W/m2 HBBay [0/134.3] Hard band (2-10keV) flux (4)
58- 62 F5.3 10-18W/m2 E_HBBay [0.08/3.4]? Upper 1σ error in HBBay (4)
64- 68 F5.3 10-18W/m2 e_HBBay [0/3.1]? Lower 1σ error in HBBay (4)
70- 75 F6.3 10-18W/m2 UBBay [0/79.4] Ultra hard band (5-10 keV) flux (4)
77- 81 F5.3 10-18W/m2 E_UBBay [0.1/3.5]? Upper 1σ error in UBBay (4)
83- 87 F5.3 10-18W/m2 e_UBBay [0/3]? Lower 1σ error in UBBay (4)
89- 94 F6.3 --- HRBay Hardness ratio (HR) (5)
96-100 F5.3 --- E_HRBay Upper 1σ error in HRBay (5)
102-106 F5.3 --- e_HRBay Lower 1σ error in HRBay (5)
108-108 I1 --- P [0/1]? Photometry quality flag (6)
--------------------------------------------------------------------------------
Note (4): All fluxes estimated using the Bayesian methodology of
Laird et al. 2009, J/ApJS/180/102
Note (5): Hardness ratio determined by BEHR (Bayesian Estimation of Hardness
Ratios) from Park et al. (2006ApJ...652..610P 2006ApJ...652..610P) using the
counts in the 0.5-2 and 2-7keV spectral bands.
Note (6): Quality of the X-ray photometry as follows:
1 = the presence of a nearby source that may be contaminating the photometry
2 = another source was detected with the 90% EEF and that the photometry is
likely heavily contaminated and the source position uncertain
0 = All other sources
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table13.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/1686] Running Object number
6- 11 A6 --- --- [aegis_]
12- 14 I3 --- XID [001/937] AEGIS X-ray Object ID
16- 26 A11 --- Rb Object Identification in Rainbow
28- 38 F11.7 deg RAXdeg X-ray Right Ascension (J2000) (7)
40- 49 F10.7 deg DEXdeg X-ray Declination (J2000) (7)
51- 61 F11.7 deg RACdeg Counterpart Right Ascension (J2000)
63- 72 F10.7 deg DECdeg Counterpart Declination (J2000)
74- 82 A9 --- PRIM Counterpart detection survey (8)
84 I1 --- R [0/1] Robustness of Counterpart; 1 is secure.
--------------------------------------------------------------------------------
Note (7): X-ray positions after registration to the counterpart astrometry
in the Rainbow database.
Note (8): Mainly "RAINBOW" and "SubaruR" along with "SubaruK", "PalomarJK",
"MMT", "CFHTLS" or "none".
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table14.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/1686] Running Object number
6- 16 A11 --- Rb Object Identification in Rainbow
18- 29 F12.8 deg RAdeg Counterpart Right Ascension in decimal
degrees (J2000)
31- 41 F11.8 deg DEdeg Counterpart Declination in decimal
degrees (J2000)
43- 48 F6.2 mag Rcmag [14.8/28]? SUBARU Rc (648.64nm) AB magnitude
50- 55 F6.2 mag e_Rcmag [0.02/1.5]? Uncertainty in Rcmag
57- 62 F6.2 mag i'mag [13.6/27.6]? CFHTLS i' (765.91nm) AB magnitude
64- 69 F6.2 mag e_i'mag [0.01/0.8]? Uncertainty in i'mag
71- 76 F6.2 mag r'mag [13.5/28]? CFHTLS r' (623.41nm) AB magnitude
78- 83 F6.2 mag e_r'mag [0.01/0.9]? Uncertainty in r'mag
85- 90 F6.2 mag g'mag [13.8/28]? CFHTLS g' (483.37nm) AB magnitude
92- 97 F6.2 mag e_g'mag [0.01/0.7]? Uncertainty in g'mag
99-104 F6.2 mag z'mag [13/27.8]? CFHTLS z' (882.09nm) AB magnitude
106-111 F6.2 mag e_z'mag [0.01/3.1]? Uncertainty in z'mag
113-118 F6.2 mag u*mag [14.2/27.8]? CFHTLS u* (380.56nm) AB magnitude
120-125 F6.2 mag e_u*mag [0.01/0.7]? Uncertainty in u*mag
127-132 F6.2 mag i'mag2 [13.4/26.4]? MMT i' (777.05nm) AB magnitude
134-139 F6.2 mag e_i'mag2 [0.03/0.6]? Uncertainty in i'mag2
141-146 F6.2 mag g'mag2 [14.2/27.4]? MMT g' (476.35nm) AB magnitude
148-153 F6.2 mag e_g'mag2 [0.03/0.7]? Uncertainty in g'mag2
155-160 F6.2 mag z'mag2 [13/26.2]? MMT z' (903.09nm) AB magnitude
162-167 F6.2 mag e_z'mag2 [0.03/0.4]? Uncertainty in z'mag2
169-174 F6.2 mag u'mag2 [13.4/27.4]? MMT u' (360.41nm) AB magnitude
176-181 F6.2 mag e_u'mag2 [0.05/0.8]? Uncertainty in u'mag2
183-188 F6.2 mag Bmag [14.5/27.1]? CFH DEEP B (440.20nm) AB magnitude
190-195 F6.2 mag e_Bmag [0.04/0.7]? Uncertainty in Bmag
197-202 F6.2 mag Rmag [14.8/27]? CFH DEEP R (659.51nm) AB magnitude
204-209 F6.2 mag e_Rmag [0.03/1]? Uncertainty in Rmag
211-216 F6.2 mag Imag [14.2/26.1]? CFH DEEP I (811.87nm) AB magnitude
218-223 F6.2 mag e_Imag [0.03/1.1]? Uncertainty in Imag
225-230 F6.2 mag Ksmag [13/25.6]? Subaru MOIRCS Ks (2135.44nm) AB
magnitude
232-237 F6.2 mag e_Ksmag [0.04/1.3]? Uncertainty in Ksmag
239-244 F6.2 mag Jmag [11.6/25]? CAHA J (1202.97nm) AB magnitude
246-251 F6.2 mag e_Jmag [0.1/1.2]? Uncertainty in Jmag
253-258 F6.2 mag Jmag2 [13/23.5]? Palomar WIRC J (1243.50nm) AB magnitude
260-265 F6.2 mag e_Jmag2 [0.01/0.5]? Uncertainty in Jmag2
267-272 F6.2 mag Ksmag2 [12/23.2]? Palomar WIRC Ks (2135.30nm) AB
magnitude
274-279 F6.2 mag e_Ksmag2 [0.01/0.5]? Uncertainty in Ksmag2
281-286 F6.2 mag Jmag3 [16/27]? NICMOS "J" F110W (1062.24nm) AB magnitude
288-293 F6.2 mag e_Jmag3 [0.02/1.8]? Uncertainty in Jmag3
295-300 F6.2 mag Hmag3 [16/26]? NICMOS "H" F160W (1581.96nm) AB magnitude
302-307 F6.2 mag e_Hmag3 [0.01/0.4]? Uncertainty in Hmag3
309-314 F6.2 mag Vmag [13/28]? HST/ACS "V" F606W (579.67nm) AB magnitude
316-321 F6.2 mag e_Vmag [0.01/1.4]? Uncertainty in Vmag
323-328 F6.2 mag Imag2 [12.9/28]? HST/ACS "I" F814W (823.40nm) AB
magnitude
330-335 F6.2 mag e_Imag2 [0.01/2]? Uncertainty in Imag2
337-342 F6.2 mag F125 [14.9/27]? HST/WFC3 F125 (1242.58nm) AB magnitude
344-349 F6.2 mag e_F125 [0.01/0.8]? Uncertainty in F125
351-356 F6.2 mag F160 [14.8/28]? HST/WFC3 F160 (1532.47nm) AB magnitude
358-363 F6.2 mag e_F160 [0.01/0.5]? Uncertainty in F160
365-370 F6.2 mag J1mag [13.1/25.3]? NEWFIRM J1 (1044.14nm) AB magnitude
372-377 F6.2 mag e_J1mag [0.01/0.4]? Uncertainty in J1mag
379-384 F6.2 mag J2mag [13.2/26]? NEWFIRM J2 (1193.00nm) AB magnitude
386-391 F6.2 mag e_J2mag [0.01/1.5]? Uncertainty in J2mag
393-398 F6.2 mag J3mag [13.4/25]? NEWFIRM J3 (1276.40nm) AB magnitude
400-405 F6.2 mag e_J3mag [0.01/0.8]? Uncertainty in J3mag
407-412 F6.2 mag H1mag [12.8/24.2]? NEWFIRM H1 (1558.54nm) AB magnitude
414-419 F6.2 mag e_H1mag [0.01/0.4]? Uncertainty in H1mag
421-426 F6.2 mag H2mag [13.1/24.2]? NEWFIRM H2 (1704.88nm) AB magnitude
428-433 F6.2 mag e_H2mag [0.01/0.3]? Uncertainty in H2mag
435-440 F6.2 mag Kmag [12.9/24.3]? NEWFIRM K (2164.39nm) AB magnitude
442-447 F6.2 mag e_Kmag [0.01/0.3]? Uncertainty in Kmag
449-454 F6.2 mag IRAC1 [12.4/25.7]? Spitzer IRAC (3541.66nm) AB magnitude
456-461 F6.2 mag e_IRAC1 [0.02/1.2]? Uncertainty in IRAC1
463-468 F6.2 mag IRAC2 [13/24.7]? Spitzer IRAC (4482.62nm) AB magnitude
470-475 F6.2 mag e_IRAC2 [0.02/1.1]? Uncertainty in IRAC2
477-482 F6.2 mag IRAC3 [13.5/26.5]? Spitzer IRAC (5645.72nm) AB magnitude
484-489 F6.2 mag e_IRAC3 [0.02/2.5]? Uncertainty in IRAC3
491-496 F6.2 mag IRAC4 [13.9/27.6]? Spitzer IRAC (7826.48nm) AB magnitude
498-503 F6.2 mag e_IRAC4 [0.02/4]? Uncertainty in IRAC4
505-510 F6.2 mag NUV [14.7/26.3]? GALEX NUV (152.81nm) AB magnitude
512-517 F6.2 mag e_NUV [0/0.5]? Uncertainty in NUV
519-524 F6.2 mag FUV [15.9/26.1]? GALEX FUV (227.11nm) AB magnitude
526-531 F6.2 mag e_FUV [0/0.6]? Uncertainty in FUV
533-535 I3 --- XID [001/937] AEGIS X-ray Object ID;
column added by CDS
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table15.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- seq [1/1686] Running Object number
6- 16 A11 --- Rb Object Identification in Rainbow
18- 23 F6.3 --- zsp [-0.001/6.4]?=-1 Spectroscopic redshift (1)
25- 26 I2 --- f_zsp [0/11] Spectroscopic redshift confidence (2)
28- 28 I1 --- r_zsp ? Spectroscopic redshift reference (3)
30- 31 I2 --- Nb [2/31] Number of photometric points
33- 37 F5.3 --- zph1 [0.01/7] Photometric redshift
39- 43 F5.3 --- e_zph1 1 sigma Lower value of photometric redshift
45- 49 F5.3 --- E_zph1 1 sigma Upper value of photometric redshift
51- 55 F5.3 --- ezph190 90% Lower value of photometric redshift
57- 61 F5.3 --- Ezph190 90% Upper value of photometric redshift
63- 69 F7.3 --- PDZ1 Redshift Probability distribution P(z) for
zphot1
71- 73 I3 --- Mod1 Best fitting template for zphot1 (4)
75- 80 F6.2 --- zph2 ?=-99 Second best Photometric Redshift
82- 86 F5.2 --- PDZ2 ?=0 Redshift Probability distribution P(z) for
zphot2
88- 91 I4 --- Mod2 ?=-999 Best fitting template for zphot2 (4)
93- 95 I3 --- XID [001/937] AEGIS X-ray Object ID;
column added by CDS
--------------------------------------------------------------------------------
Note (1): zsp=0.000 correspond to spectroscopically confirmed stars.
Note (2): We consider reliable only spectroscopy for which the confidence
is 3 or higher.
Note (3): Spectroscopic redshift reference
0 = no zspec;
1 = Keck, DEEP2+3; Davis et al. (2003SPIE.4834..161D 2003SPIE.4834..161D),
Cooper et al. (2011, J/ApJS/193/14),
Cooper et al. (2012MNRAS.419.3018C 2012MNRAS.419.3018C),
Newman et al. (2013ApJS..208....5N 2013ApJS..208....5N);
2 = MMT; Coil et al. (2009ApJ...701.1484C 2009ApJ...701.1484C) (first published here);
3 = CFRS; Lilly et al. (1995, VII/225);
4 = SDSS DR9; Ahn et al. 2012, V/139);
5 = LBG; Steidel et al. (2003, J/ApJ/592/728)
Note (4): Best fitting template:
1 -- 31 = From the Salvato et al. (2009ApJ...690.1250S 2009ApJ...690.1250S)
classification scheme;
101 -- 131 = From the Ilbert et al. (2009ApJ...690.1236I 2009ApJ...690.1236I)
galaxy library
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Nov-2015