J/ApJS/251/2 CDWFS: Chandra survey in Bootes. I. X-ray cat. (Masini+, 2020)
The Chandra Deep Wide-Field Survey: a new Chandra Legacy Survey in the Bootes
Field.
I. X-ray point source catalog, number counts, and multiwavelength counterparts.
Masini A., Hickox R.C., Carroll C.M., Aird J., Alexander D.M., Assef R.J.,
Bower R., Brodwin M., Brown M.J.I., Chatterjee S., Chen C.-T.J., Dey A.,
DiPompeo M.A., Duncan K.J., Eisenhardt P.R.M., Forman W.R., Gonzalez A.H.,
Goulding A.D., Hainline K.N., Jannuzi B.T., Jones C., Kochanek C.S.,
Kraft R., Lee K.-S., Miller E.D., Mullaney J., Myers A.D., Ptak A.,
Stanford A., Stern D., Vikhlinin A., Wake D.A., Murray S.S.
<Astrophys. J. Suppl. Ser., 251, 2 (2020)>
=2020ApJS..251....2M 2020ApJS..251....2M
ADC_Keywords: X-ray sources; Cross identifications; Photometry, infrared;
Redshifts; Surveys
Keywords: Catalogs ; X-ray active galactic nuclei ; X-ray astronomy ;
Active galactic nuclei ; AGN host galaxies
Abstract:
We present a new, ambitious survey performed with the Chandra X-ray
Observatory of the 9.3deg2 Bootes field of the NOAO Deep Wide-Field
Survey. The wide field probes a statistically representative volume of
the universe at high redshift. The Chandra Deep Wide-field Survey
exploits the excellent sensitivity and angular resolution of Chandra
over a wide area, combining 281 observations spanning 15yr, for a
total exposure time of 3.4Ms, and detects 6891 X-ray point sources
down to limiting fluxes of 4.7x10-16, 1.5x10-16, and
9x10-16erg/cm2/s in the 0.5-7, 0.5-2, and 2-7keV bands,
respectively. The robustness and reliability of the detection strategy
are validated through extensive, state-of-the-art simulations of the
whole field. Accurate number counts, in good agreement with previous
X-ray surveys, are derived thanks to the uniquely large number of
point sources detected, which resolve 65.0%±12.8% of the cosmic
X-ray background between 0.5 and 2keV and 81.0%±11.5% between 2 and
7keV. Exploiting the wealth of multiwavelength data available on the
field, we assign redshifts to ∼94% of the X-ray sources, estimate
their obscuration, and derive absorption-corrected luminosities.
Description:
The NOAO Deep Wide-Field Survey (NDWFS) Bootes field
(Jannuzi & Dey 1999ASPC..191..111J 1999ASPC..191..111J), centered on coordinates
of RAJ2000=14:32:05.712, DEJ2000=+34:16:47.496, has been extensively
observed by Chandra over more than 15yr of operations. Many additional
pointings complemented the two most intensive runs of observations,
the XBootes survey performed during Chandra's Cycle 3
(Kenter+ 2005, J/ApJS/161/9 and Murray+ 2005ApJS..161....1M 2005ApJS..161....1M) and the
recent large program in Cycle 18 (PI: R. Hickox).
To fully exploit the huge amount of information on the same area of
the sky, we collected all 281 Chandra pointings in the Bootes field
conducted between 2003 and 2018, all in VFAINT mode (see Table 1).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 43 281 Chandra observations
tableb1.dat 164 394 Excluded XBootes sources
tableb2.dat 936 6891 The main source catalog
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-2014)
VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)
VIII/103 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)
VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/AJ/123/1784 : 1.4 GHz imaging of the Bootes field (de Vries+, 2002)
J/A+A/409/79 : HELLAS2XMM survey. IV. (Fiore+, 2003)
J/AJ/127/213 : LALA Bootes field X-ray source catalog (Wang+, 2004)
J/A+A/432/69 : Extremely Red Objects XMM-Newton observations (Brusa+, 2005)
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/ApJ/641/140 : Opt. counterparts in the NDWFS Bootes field (Brand+, 2006)
J/ApJS/169/401 : ChaMP X-ray point source catalog (Kim+, 2007)
J/ApJ/701/428 : The Spitzer Deep, Wide-Field Survey (SDWFS) (Ashby+, 2009)
J/ApJS/184/158 : Chandra COSMOS survey I. (Elvis+, 2009)
J/ApJS/180/102 : AEGIS-X: Chandra deep survey (Laird+, 2009)
J/ApJ/716/348 : The XMM-Newton survey of the COSMOS field (Brusa+, 2010)
J/ApJ/716/530 : Mid-IR variability from the SDWFS (Kozlowski+, 2010)
J/ApJ/727/20 : The Megamaser Cosmology Project (MCP). III. (Kuo+, 2011)
J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011)
J/ApJS/200/8 : AGES: the AGN and Galaxy Evolution Survey (Kochanek+, 2012)
J/A+A/549/A55 : GMRT 153MHz (2m) Radio Mini Survey I. (Williams+, 2013)
J/ApJ/793/82 : LOFAR Bootes and 3C295 field sources (van Weeren+, 2014)
J/MNRAS/450/1477 : VLA 352MHz image of the Bootes field. I. (Coppejans+, 2015)
J/ApJS/220/10 : AEGIS-X Deep survey of EGS (AEGIS-XD) (Nandra+, 2015)
J/ApJ/819/62 : The COSMOS-Legacy Survey (CLS) catalog (Civano+, 2016)
J/ApJ/817/119 : Spitzer/IRAC variability in Bootes field (Kozlowski+, 2016)
J/ApJ/817/172 : X-ray Observations of Stripe 82 (LaMassa+, 2016)
J/ApJ/817/34 : C-COSMOS Legacy multiwavelength catalog (Marchesi+, 2016)
J/ApJS/228/2 : Chandra Deep Field-South survey: 7Ms sources (Luo+, 2017)
J/A+A/620/A74 : Bootes field LOFAR 150MHz imaging (Retana-Montenegro+, 2018)
J/MNRAS/473/4937 : AllWISE ctp to ROSAT/2RXS & XMMSLEW2 (Salvato+, 2018)
J/ApJ/877/5 : Chandra DF obscured & Compton-thick AGNs. I. (Li+, 2019)
http://cda.harvard.edu/chaser/ : Chandra data archive home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- obsID [3130/19781] Chandra observation identifier
7- 13 F7.3 deg RAdeg [216.3/219.8] Right ascension (J2000) (RA_PNT)
15- 20 F6.3 deg DEdeg [32.4/35.8] Declination (J2000) (DEC_PNT)
22- 26 F5.1 --- Roll [0.2/358] Roll angle (ROLL_ANGLE)
28- 32 F5.1 ks Exp [4.2/119.9] Exposure time (EXPOSURE)
34- 40 F7.1 d MJD [52380.1/58314.1] Modified Julian Date
42- 43 I2 --- Cycle [3/18] Cycle number
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Byte-by-byte Description of file: tableb1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- CXOXB Name of the source (JHHMMSS.s+DDMMSS)
18- 21 I4 --- K05 [1/3289] Number of the source in Kenter+
(2005, J/ApJS/161/9 ;
in Simbad
-- see column CXOXB)
23- 33 F11.7 deg RAdeg [216/219.8] Right ascension (J2000) (RA)
35- 44 F10.7 deg DEdeg [32.3/35.9] Declination (J2000) (DEC)
46- 55 E10.5 --- Fprob [2.4e-5/1] F-band Poissonian probability that the
source is a background fluctuation (PROB_F)
57- 62 F6.3 arcsec Fr90 [1/15.7] F-band exposure-weighted average r90
(R90_F) (1)
64- 68 F5.2 ct Ftot [0/30] F-band total counts within a circle
of radius r90 (TOT_F)
70- 76 F7.4 ct Fbkg [0.016/22.4] F-band background counts within
a circle of radius r90 (BKG_F)
78- 84 F7.1 s Fexp [1821/98605] Full (0.5-7keV) exposure time (EXP_F)
86- 95 E10.5 --- Sprob [3e-5/1] S-band Poissonian probability that the
source is a background fluctuation (PROB_S)
97- 102 F6.3 arcsec Sr90 [1/15.7] S-band exposure-weighted average r90
(R90_S) (1)
104- 108 F5.2 ct Stot [0/11] S-band total counts within a circle
of radius r90 (TOT_S)
110- 115 F6.4 ct Sbkg [0.0046/6.4] S-band background counts within
a circle of radius r90 (BKG_S)
117- 123 F7.1 s Sexp [1746/94126] Soft (0.5-2keV) exposure time (EXP_S)
125- 134 E10.5 --- Hprob [4.7e-5/1] H-band Poissonian probability that the
source is a background fluctuation (PROB_H)
136- 141 F6.3 arcsec Hr90 [1.8/16.5] H-band exposure-weighted average r90
(R90_H) (1)
143- 147 F5.2 ct Htot [0/24] H-band total counts within a circle
of radius r90 (TOT_H)
149- 155 F7.4 ct Hbkg [0.036/18.2] H-band background counts within
a circle of radius r90 (BKG_H)
157- 164 F8.1 s Hexp [1837/100125] Hard (2-7keV) exposure time (EXP_H)
--------------------------------------------------------------------------------
Note (1): F-, S- and H-band exposure-weighted average r90, the approximate
circular radius encompassing 90% of Chandra's PSF (in arcseconds).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableb2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/6891] Sequential number of the X-ray
source (ID)
6- 16 F11.7 deg RAdeg [216/220] X-ray source right ascension (J2000)
(RAJ2000)
18- 27 F10.7 deg DEdeg [32.3/36] X-ray source declination (J2000)
(DEJ2000)
29- 32 F4.2 arcsec ePos [0.1/4.3] Positional error of the X-ray source
(POS_ERR)
34- 44 E11.5 --- Fprob F-band Poissonian probability that the
source is a background fluctuation (PROB_F)
46- 51 F6.3 arcsec Fr90 [1/15] F-band exposure-weighted average r90
(R90_F) (1)
53- 60 F8.2 ct Ftot [0/13221] F-band total counts within a circle
of radius r90 (TOT_F)
62- 68 F7.4 ct Fbkg [0.003/39.2] F-band background counts within
a circle of radius r90 (BKG_F) (2)
70- 77 F8.2 ct Fnet [2/13217] F-band net counts within a circle of
radius r90 or 3σ upper limit (NET_F) (3)
79- 84 F6.2 ct E_Fnet [3/117]?=- Positive error on Fnet (ENETF_P)
86- 91 F6.2 ct e_Fnet [1/115]?=- Negative error on Fnet (ENETF_N)
93-100 F8.1 s Fexp [1265/171082] F-band total exposure (EXP_F)
102-111 E10.5 ct/s FCR [4.9e-5/0.3] F-band net count rate or
3σ upper limit (CR_F) (3)
113-123 E11.5 ct/s E_FCR [3e-5/0.006]?=- Positive error on FCR (ECRF_P)
125-135 E11.5 ct/s e_FCR [2e-5/0.005]?=- Negative error on FCR (ECRF_N)
137-146 E10.5 mW/m2 FFlux [4.6e-16/3.3e-12] F-band (0.5-7keV) flux or
3σ upper limit (FLUX_F) (3) (4)
148-158 E11.5 mW/m2 E_FFlux [2.9e-16/5e-14]?=- Positive error on FFlux
(EFLUXF_P)
160-170 E11.5 mW/m2 e_FFlux [1.9e-16/4.6e-14]?=- Negative error on FFlux
(EFLUXF_N)
172-182 E11.5 --- Sprob S-band Poissonian probability that the
source is a background fluctuation (PROB_S)
184-189 F6.3 arcsec Sr90 [1/15] S-band exposure-weighted average r90
(R90_S) (1)
191-198 F8.2 ct Stot [0/10730] S-band total counts within a circle
of radius r90 (TOT_S)
200-206 F7.4 ct Sbkg [0.001/11.5] S-band background counts within
a circle of radius r90 (BKG_S) (2)
208-215 F8.2 ct Snet [1.9/10729] S-band net counts within a circle
of radius r90 or 3σ upper limit
(NET_S) (3)
217-222 F6.2 ct E_Snet [3/105]?=- Positive error on Snet (ENETS_P)
224-229 F6.2 ct e_Snet [1/104]?=- Negative error on Snet (ENETS_N)
231-238 F8.1 s Sepx [1267/170328] S-band total exposure (EXP_S)
240-249 E10.5 ct/s SCR [3e-5/0.3] S-band net count rate or
3σ upper limit (CR_S) (3)
251-261 E11.5 ct/s E_SCR [2.6e-5/0.005]?=- Positive error on SCR
(ECRS_P)
263-273 E11.5 ct/s e_SCR [1.4e-5/0.005]?=- Negative error on SCR
(ECRS_N)
275-284 E10.5 mW/m2 SFlux [1.4e-16/1.6e-12] S-band (0.5-2keV) flux or
3σ upper limit (FLUX_S) (3) (4)
286-296 E11.5 mW/m2 E_SFlux [1e-16/2.2e-14]?=- Positive error on SFlux
(EFLUXS_P)
298-308 E11.5 mW/m2 e_SFlux [6.6e-17/2e-14]?=- Negative error on SFlux
(EFLUXS_N)
310-320 E11.5 --- Hprob H-band Poissonian probability that the
source is a background fluctuation (PROB_H)
322-327 F6.3 arcsec Hr90 [1.8/16] H-band exposure-weighted average r90
(R90_H) (1)
329-335 F7.2 ct Htot [0/2592] H-band total counts within a circle
of radius r90 (TOT_H)
337-343 F7.4 ct Hbkg [0.005/31.5] H-band background counts within
a circle of radius r90 (BKG_H) (2)
345-351 F7.2 ct Hnet [1.8/2588] H-band net counts within a circle of
radius r90 or 3σ upper limit (NET_H) (3)
353-358 F6.2 ct E_Hnet [3/53]?=- Positive error on Hnet (ENETH_P)
360-365 F6.2 ct e_Hnet [1/51]?=- Negative error on Hnet (ENETH_N)
367-374 F8.1 s Hexp [1350/169367] H-band total exposure (EXP_H)
376-385 E10.5 ct/s HCR [3.7e-5/0.06] H-band net count rate
or 3σ upper limit (CR_H)
387-397 E11.5 ct/s E_HCR [2.9e-5/0.004]?=- Positive error on HCR
(ECRH_P)
399-409 E11.5 ct/s e_HCR [1.8e-5/0.003]?=- Negative error on HCR
(ECRH_N)
411-420 E10.5 mW/m2 HFlux [7.3e-16/1.1e-12] H-band (2-7keV) flux or
3σ upper limit (FLUX_H) (3) (4)
422-432 E11.5 mW/m2 E_HFlux [5.8e-16/6.2e-14]?=- Positive error on Hflux
(EFLUXH_P)
434-444 E11.5 mW/m2 e_HFlux [3.7e-16/5.5e-14]?=- Negative error on Hflux
(EFLUXH_N)
446-452 F7.4 --- HR [-0.99/0.99] Hardness ratio computed with
Bayesian estimation (BEHR;
Park+ 2006ApJ...652..610P 2006ApJ...652..610P)
454-459 F6.4 --- E_HR [0.006/0.8] Positive error on HR (EHRP)
461-466 F6.4 --- e_HR [0.007/0.9] Negative error on HR (EHRN)
468-471 I4 --- K05 [/3293]?=-99 Index of the XBootes counterpart
in Kenter+ (2005, J/ApJS/161/9) (XB_ID)
473-488 A16 --- CXOXB Name of the XBootes counterpart in
Kenter+ (2005, J/ApJS/161/9) (XB_NAME)
490-497 F8.4 arcsec SepK05 [0/11.1]?=- Distance between the CDWFS source
and its XBootes counterpart (XBCDWFSD)
499 I1 --- Nxb [0/2] Number of XBootes counterparts
(XB_HOWMANY) (5)
501-511 F11.7 deg RANdeg [216.1/219.8]?=- Right ascension (J2000) for
the I-band NDWFS counterpart (NDWFS_RAJ2000)
513-523 F11.7 deg DENdeg [32.3/35.9]?=- Declination (J2000) for the
I-band NDWFS counterpart (NDWFS_DEJ2000)
525-532 F8.4 mag Imag [12.4/99]?=- Vega I-band automatic magnitude
("MAG_AUTO") as computed by SExtractor
(NDWFSIMAG_AUTO) (6)
534-544 F11.7 deg RASdeg [216.1/219.9]?=- Right ascension (J2000) for
[3.6]-band SDWFS counterpart (SDWFS_RAJ2000)
546-556 F11.7 deg DESdeg [32.3/35.9]?=- Declination (J2000) for
[3.6]-band SDWFS counterpart (SDWFS_DEJ2000)
558-565 F8.4 mag 3.6mag [7.7/20.2]?=- SDWFS Spitzer/IRAC 3.6um Vega
magnitude (SDWFSCH1MAG)
567-574 F8.4 mag 4.5mag [7.3/99]?=- SDWFS Spitzer/IRAC 4.5um Vega
magnitude (SDWFSCH2MAG)
576-583 F8.4 mag 5.8mag [6/99]?=- SDWFS Spitzer/IRAC 5.8um Vega
magnitude (SDWFSCH3MAG)
585-592 F8.4 mag 8mag [6.1/99]?=- SDWFS Spitzer/IRAC 8um Vega
magnitude (SDWFSCH4MAG)
594-601 F8.4 mag e_3.6mag [0/0.4]?=- 3.6mag uncertainty (SDWFSECH1_MAG)
603-610 F8.4 mag e_4.5mag [0/99]?=- 4.5mag uncertainty (SDWFSECH2_MAG)
612-619 F8.4 mag e_5.8mag [0.0002/99]?=- 5.8mag uncertainty
(SDWFSECH3_MAG)
621-628 F8.4 mag e_8mag [0.0002/99]?=- 8mag uncertainty
(SDWFSECH4_MAG)
630-634 F5.1 --- SDWFS [-99/7] SDWFS flag (SDWFS_FLAG) (7)
636-643 F8.6 arcsec SepN [0.006/9.7]?=- Separation between the CDWFS
source and its NDWFS counterpart
(NDWFSCDWFSD)
645-652 F8.6 arcsec SepS [0.002/9.9]?=- Separation between the CDWFS
source and its SDWFS counterpart
(SDWFSCDWFSD)
654-661 F8.6 arcsec SepSN [0.0002/1.8]?=- Separation between the NDWFS
and SDWFS counterparts (SDWFSNDWFSD)
663-670 F8.6 arcsec SepMax [0/9.9] Maximal separation between the
CDWFS and its counterparts (MAX_D) (8)
672 I1 --- Ncat [1/3] Number of catalogs in which the source is
contained, with 1 meaning only CDWFS and
3 meaning CDWFS, NDWFS, and SDWFS
674-683 F10.6 --- PBay [-48.4/24] NWAY logarithm of the ratio between
prior and posterior from distance matching
(DIST_BAYES)
685-692 F8.6 --- PPost [0/1] NWAY distance posterior probability
comparing the association against no
association (DIST_POST)
694-701 F8.6 --- BiasI [0.16/6.6] NWAY bias factors coming from the
additional I-band magnitude information
(BIASNDWFSIMAGAUTO)
703-710 F8.6 --- Bias3.6 [0.18/4.7] NWAY bias factors coming from the
additional [3.6]-band magnitude information
(BIASSDWFSCH1_MAG)
712-719 F8.6 --- Psing [0/1] NWAY distance posterior probability
comparing the association against no
association after adding magnitude of the
counterparts (P_SINGLE)
721-728 F8.6 --- Pany [0/1] NWAY p_any parameter (P_ANY) (9)
730-739 F10.6 --- zsp [-8/4.8]?=- Spectroscopic redshift from
the AGES catalog (Kochanek+ 2012, J/ApJS/200/8)
741-748 F8.4 --- zphot [0.002/7]?=- Photometric redshift (ZPH) (10)
750-757 F8.4 --- b_zphot [0/7]?=- Minimum of the primary peak above
the 80% HPD CI zphot (ZPH_MIN)
759-766 F8.4 --- B_zphot [0/7]?=- Maximum of the primary peak above
the 80% HPD CI zphot (ZPH_MAX)
768-770 I3 --- Deep [-99/1] "FLAG_DEEP" (1=good) (FLAG_DEEP) (11)
772-778 I7 --- D20 [4078/2213084]?=- Index of the source in the
Duncan+ (2020, submitted) catalog (ID_DUNCAN)
780-789 F10.6 --- zbest [0/7]?=- Best redshift: spectroscopic when
available, photometric otherwise
791-795 F5.1 --- f_zbest [-99/1] zbest flag (1=spectroscopic,
0=photometric, -99=no redshift available)
(ZFLAG)
797-802 F6.2 cm-2 logNH [20/24.7]?=- Logarithm of the column density
(LOG_NH) (12)
804-809 F6.2 cm-2 E_logNH [0/3.7]?=- logNH positive uncertainty
(ELOGNH_P)
811-816 F6.2 cm-2 e_logNH [0/3.6]?=- logNH negative uncertainty
(ELOGNH_N)
818-824 F7.3 --- Fkcor [0.2/1]?=- Correction factors k for the F-band
(K_F) (13)
826-832 F7.3 --- b_Fkcor [0.002/1]?=- Minimal value of Fkcor (KFMIN)
834-840 F7.3 --- B_Fkcor [0.2/1]?=- Maximal value of Fkcor (KFMAX)
842-848 F7.3 --- Skcor [0.001/1]?=- Correction factors k for the
S-band (K_S) (13)
850-856 F7.3 --- b_Skcor [0/1]?=- Minimal value of Skcor (KSMIN)
858-864 F7.3 --- B_Skcor [0.004/1]?=- Maximal value of Skcor (KSMAX)
866-872 F7.3 --- Hkcor [0.3/1]?=- Correction factors k for the
H-band (K_H) (13)
874-880 F7.3 --- b_Hkcor [0.004/1]?=- Minimal value of Hkcor (KHMIN)
882-888 F7.3 --- B_Hkcor [0.4/1]?=- Maximal value of Hkcor (KHMAX)
890-900 E11.5 10-7W FLum [4.8e+37/1.2e+48]?=- Deabsorbed rest-frame
luminosities in the F-band (0.5-7keV)
(LINT_F) (14)
902-912 E11.5 10-7W SLum [1.9e+37/5.6e+47]?=- Deabsorbed rest-frame
luminosities in the S-band (0.5-2keV)
(LINT_S) (14)
914-924 E11.5 10-7W HLum [8.7e+37/3.9e+47]?=- Deabsorbed rest-frame
luminosities in the H-band (2-7keV)
(LINT_H) (14)
926-936 E11.5 10-7W L2-10 [1.1e+38/5.1e+47]?=- Deabsorbed rest-frame
luminosity in the 2-10keV band (LINT_2-10) (15)
--------------------------------------------------------------------------------
Note (1): F-, S- and H-band exposure-weighted average r90, the approximate
circular radius encompassing 90% of Chandra's PSF (in arcseconds).
This radius was used to extract aperture photometry.
Note (2): Background counts within a circle of radius r90, extracted from
our background maps at the position of the source.
Note (3): 3σ upper limit if the probability of the source being spurious
is higher than the threshold; in that case, positive and negative errors
are NULL values.
Note (4): The flux is obtained from the count rate (or its upper limit) by
applying an aperture correction and the appropriate exposure-weighted
ECF assuming Γ=1.4.
Note (5): Number of XBootes counterparts associated within 1.1xr90 with
the CDWFS source. Zero if no counterpart is found. If more than one
XBootes counterpart is found, the closest one was chosen.
Note (6): 99 if I-band photometry is unreliable (see also the "FLAG_DEEP"
entry).
Note (7): SDWFS (the Spitzer Deep Wide-field survey; Ashby+ 2009ApJ...701..428A 2009ApJ...701..428A
and Kozlowski+ 2010, J/ApJ/716/530 and 2016, J/ApJ/817/119) flag
Note (8): Maximal separation in arcseconds between the CDWFS and its
counterparts, 0.0 if no counterpart is found in either of the two bands.
Note (9): For each CDWFS entry, it represents the probability that one of the
associations is the correct one. As stated in the NWAY manual, a low
value of this parameter does not rule out the associated counterpart;
it can simply mean that there is not enough information to declare it
secure.
Note (10): Photometric redshift estimate from the Duncan+ (2020, submitted)
catalog, obtained through fitting of the spectral energy distribution
(SED) with a hybrid template + machine-learning technique.
Specifically, we provide the median of the primary redshift peak above
the 80% highest probability density (HPD) credible interval (CI) for
the photometric redshift posterior.
Note (11): "FLAG_DEEP" = 1 indicates that the NDWFS source has good data that
can go to the full depth of the BwRI optical images. This flag
excludes bad pixels, bleed trails, bright star halos, and bright
galaxies; "-99" if no counterpart is found.
Note (12): Logarithm of the column density estimated from fitting the HR-z plane
using the best redshift. Note that the uncertainties reflect the HR
ones only, while the redshift is fixed. The minimum value is 20.
Note (13): Correction factors k with their maximal and minimal values for the
three Chandra bands. The correction factor is defined as the ratio
between the observed (obscured) flux and the unobscured one.
Unity values mean that the source has log(NH/cm-2)≤20 and is
considered unobscured.
Note (14): Obtained from the absorption-corrected fluxes and assuming
Γ=1.8; blank if no redshift is available or z=0.
Note (15): Obtained from the absorption-corrected H-band luminosity and assuming
Γ=1.8; blank if no redshift is available or z=0.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 01-Feb-2021