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J/ApJS/180/102           AEGIS-X: Chandra deep survey             (Laird+, 2009)

AEGIS-X: the Chandra Deep Survey of the Extended Groth Strip. Laird E.S., Nandra K., Georgakakis A., Aird J.A., Barmby P., Conselice C.J., Coil A.L., Davis M., Faber S.M., Fazio G.G., Guhathakurta P., Koo D.C., Sarajedini V., Willmer C.N.A. <Astrophys. J. Suppl. Ser., 180, 102-116 (2009)> =2009ApJS..180..102L
ADC_Keywords: X-ray sources ; Surveys ; Cross identifications ; Photometry Keywords: galaxies: active - galaxies: nuclei - surveys - X-rays: galaxies Abstract: We present the EGIS-X survey, a series of deep Chandra ACIS-I observations of the Extended Groth Strip. The survey comprises pointings at eight separate positions, each with nominal exposure of 200ks, covering a total area of approximately 0.67deg2 in a strip of length 2 degrees. We describe in detail an updated version of our data reduction and point-source-detection algorithms used to analyze these data. A total of 1325 band-merged sources have been found to a Poisson probability limit of 4x10-6, with limiting fluxes of 5.3x10-21W/m2 in the soft (0.5-2keV) band and 3.8x10-19W/m2 in the hard (2-10keV) band. We present simulations verifying the validity of our source-detection procedure and showing a very small, <1.5%, contamination rate from spurious sources. Optical/NIR counterparts have been identified from the DEEP2, CFHTLS, and Spitzer/Infrared Array Camera (IRAC) surveys of the same region. Using a likelihood ratio method, we find optical counterparts for 76% of our sources, complete to RAB=24.1, and, of the 66% of the sources that have IRAC coverage, 94% have a counterpart to a limit of 0.9uJy at 3.6um (mAB=23.8). After accounting for (small) positional offsets in the eight Chandra fields, the astrometric accuracy of Chandra positions is found to be 0"8rms; however, this number depends both on the off-axis angle and the number of detected counts for a given source. All data products described in this paper are made available via a public Web site. Description: The data used in this paper were obtained during two Chandra observation cycles. An initial Chandra observation in the EGS region was taken in 2002 August during Cycle 3. These observations of the "Groth-Westphal Strip" (GWS) region have been reported by Nandra et al. (2005, Cat. J/MNRAS/356/568). The majority of the AEGIS-X data were obtained over the period 2005 March-December as part of Chandra Cycle 6. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table9.dat 118 1325 Chandra AEGIS-X source catalog: basic source properties table10.dat 187 1325 Chandra AEGIS-X source catalog: source fluxes and hardness ratios table11.dat 109 1325 Optical and IR counterparts to the AEGIS-X sources
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) J/ApJS/177/431 : Mid-IR sources in EGS (Barmby+, 2008) J/ApJ/642/126 : Mid-IR observations in the extended Groth strip (Barmby+, 2006) J/AJ/132/2159 : IRAC counterparts of 6cm galaxies in EGS (Willner+, 2006) J/ApJ/625/6 : Galaxy groups in the DEEP2 Galaxy Redshift Survey (Gerke+, 2005) J/MNRAS/356/568 : Deep Chandra survey of the Groth Strip (Nandra+, 2005) J/MNRAS/371/221 : Deep Chandra survey of the Groth Strip. II. (Georgakakis+, 2006) : CFHTLS data releases : DEEP2 redshift survey Home Page Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [egs_] (Extended Groth Strip) 5- 8 I4 --- egs [1,1325] Source ID (G1) 10- 12 A3 --- --- [egs] 13- 17 A5 --- Field Field ID identifying individual field in which the source was detected 19- 34 A16 --- CXOEGS CXO Object name (JHHMMSS.s+DDMMSS) 36- 45 F10.6 deg RAdeg X-ray Right Ascension in decimal degrees (J2000) 47- 55 F9.6 deg DEdeg X-ray Declination in decimal degrees (J2000) 57- 60 F4.2 arcsec e_Pos Positional error 62- 66 F5.2 arcmin OAA Off-axis angle 68- 71 I4 ct Fcts Full (0.5-7keV) band, total counts 73- 76 F4.1 ct Fbkg Full (0.5-7keV) band, background cts 78- 81 I4 ct Scts Soft (0.5-2keV) band, total counts 83- 86 F4.1 ct Sbkg Soft (0.5-2keV) band, background cts 88- 91 I4 ct Hcts Hard (2-7keV) band, total counts 93- 96 F4.1 ct Hbkg Hard (2-7keV) band, background cts 98-100 I3 ct Ucts Ultra hard (4-7keV) band, total counts 102-105 F4.1 ct Ubkg Ultra hard (4-7keV) band, background cts 107-110 A4 --- Band Band(s) in which source is detected (1) 112-118 E7.2 --- badProb Lowest false detection probability found for the four bands
Note (1): Band is: f = Full band (0.5-7keV); s = Soft band (0.5-2keV); h = Hard band (2-7keV); u = Ultra hard band (4-7keV).
Byte-by-byte Description of file: table10.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [egs_] (Extended Groth Strip) 5- 8 I4 --- egs [1,1325] Source ID (G1) 10 A1 --- n_egs [a] Note about Bayesian fluxes (1) 12 A1 --- l_FBay Limit flag on FBBay 14- 19 F6.2 aW/m2 FBay Bayesian method full band (0.5-10keV) flux 21- 24 F4.2 aW/m2 E_FBay ? Upper 1σ error in FBBay 26- 29 F4.2 aW/m2 e_FBay ? Lower 1σ error in FBBay 31 A1 --- l_SBay Limit flag on SBBay 33- 38 F6.2 aW/m2 SBay Bayesian method soft band (0.5-2keV) flux 40- 43 F4.2 aW/m2 E_SBay ? Upper 1σ error in SBBay 45- 48 F4.2 aW/m2 e_SBay ? Lower 1σ error in SBBay 50 A1 --- l_HBay Limit flag on HBBay 52- 57 F6.2 aW/m2 HBay Bayesian method hard band (2-10keV) flux 59- 62 F4.2 aW/m2 E_HBay ? Upper 1σ error in HBBay 64- 67 F4.2 aW/m2 e_HBay ? Lower 1σ error in HBBay 69 A1 --- l_UBay Limit flag on UBBay 71- 76 F6.2 aW/m2 UBay Bayesian method ultra hard band (5-10keV) flux 78- 81 F4.2 aW/m2 E_UBay ? Upper 1σ error in UBBay 83- 86 F4.2 aW/m2 e_UBay ? Lower 1σ error in UBBay 88 A1 --- l_Fclas Limit flag on FBclas 90- 95 F6.2 aW/m2 Fclas Classical method full band (0.5-10keV) flux (2) 97-100 F4.2 aW/m2 E_Fclas ? Upper 1σ error in FBclas (2) 102-105 F4.2 aW/m2 e_Fclas ? Lower 1σ error in FBclas 107 A1 --- l_Sclas Limit flag on SBclas 109-114 F6.2 aW/m2 Sclas Classical method soft band (0.5-2keV) flux (2) 116-119 F4.2 aW/m2 E_Sclas ? Upper 1σ error in SBclas (2) 121-124 F4.2 aW/m2 e_Sclas ? Lower 1σ error in SBclas 126 A1 --- l_Hclas Limit flag on HBclas 128-133 F6.2 aW/m2 Hclas Classical method hard band (2-10keV) flux (2) 135-138 F4.2 aW/m2 E_Hclas ? Upper 1σ error in HBclas (2) 140-143 F4.2 aW/m2 e_Hclas ? Lower 1σ error in HBclas 145 A1 --- l_Uclas Limit flag on UBclas 147-152 F6.2 aW/m2 Uclas Classical method ultra hard band (5-10keV) flux 154-157 F4.2 aW/m2 E_Uclas ? Upper 1σ error in UBclas (2) 159-162 F4.2 aW/m2 e_Uclas ? Lower 1σ error in UBclas 164-168 F5.2 --- HRb Hardness ratio (HR) using Bayesian method 170-173 F4.2 --- E_HRb Upper 1σ error in HR-Bay 175-178 F4.2 --- e_HRb Lower 1σ error in HR-Bay 180-184 F5.2 --- HRc ?=-9.99 Hardness ratio using classical method 187 I1 --- Q [0/2] Photometry quality flag (3)
Note (1): a = Bayesian fluxes in the detected bands were calculated from 70% EEF (Enclosed Energy Fraction). Note (2): or 99% upper limit if the lower 1σ column (e_Xclas) is blank. Unit is 10-15erg/cm2/s = 10-18W/m2 Note (3): Photometry quality flag 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 (OK).
Byte-by-byte Description of file: table11.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [egs_] (Extended Groth Strip) 5- 8 I4 --- egs [1,1325] Source ID (G1) 10 A1 --- f_egs ? [ab] Flag for source matching details (1) 12 A1 --- l_Rmag ? Limit flag on Rmag 14- 18 F5.2 mag Rmag ? DEEP2 R-band AB magnitude 20- 23 F4.2 arcsec DEEP2-X ? DEEP2 optical and X-ray position offset 25- 30 F6.2 --- LR-DEEP2 ? Likelihood ratio for DEEP2 counterpart 32- 39 I8 --- DEEP2-ID ? DEEP2 source ID, (2) 41 A1 --- l_imag ? Limit flag on i' mag 43- 47 F5.2 mag imag ? CFHTLS i'-band AB magnitude 49- 52 F4.2 arcsec CFHT-X ? CFHTLS optical and X-ray position offset 54- 59 F6.2 --- LR-CFHT ? Likelihood ratio for CFHTLS counterpart 61- 69 A9 --- CFHT-ID ? CFHTLS source ID (3) 71 A1 --- l_3.6mag ? Limit flag on IRAC 3.6micron mag 73- 77 F5.2 mag 3.6mag ? IRAC 3.6micron AB magnitude 79- 82 F4.2 arcsec IRAC-X ? IRAC 3.6micron and X-ray position offset 84- 89 F6.2 --- LR-IRAC ? Likelihood ratio for IRAC 3.6micron counterpart 91-109 A19 --- EGSIRAC ? IRAC 3.6micron source ID ( (4)
Note (1): Flag as follows: a = Bright, resolved galaxies that are clearly present in the CFHTLS i' imaging but have been excluded from CFHTLS catalog for unknown reason. b = Bright IRAC sources, without secure optical counterpart listed in the table, that have been excluded from Figure 9. Clear, very bright optical counterparts exist, but are excluded from DEEP2 catalog. Note (2): DEEP2 optical photometry catalog reference: Coil et al., 2004ApJ...617..765C. Note (3): CFHT Legacy Survey (CFHTLS) T0003 release catalog reference: Note (4): IRAC catalog reference: Barmby et al., 2008, Cat. J/ApJS/177/431
Global Notes: Note (G1): Sources are listed in order of increasing right ascension. <[LNG2009] egs-NNNN> in Simbad.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Oct-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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