J/A+A/488/417 XMM-Newton survey of the ELAIS-S1 field. II. (Feruglio+, 2008)
The XMM-Newton survey of the ELAIS-S1 field.
II. Identifications and multiwavelength catalogue of X-ray sources.
Feruglio C., Fiore F., La Franca F., Sacchi N., Puccetti S., Comastri A.,
Berta S., Gruppioni C., Mathur S, Matute I., Mignoli M., Vignali C.,
Zamorani G.
<Astron. Astrophys. 488, 417 (2008)>
=2008A&A...488..417F 2008A&A...488..417F
ADC_Keywords: Surveys ; X-ray sources ; Active gal. nuclei ;
Cross identifications
Keywords: galaxies: active - surveys - X-ray: diffuse background -
X-rays: galaxies - X-rays: general
Abstract:
We present the optical identifications and a multi-band catalogue of a
sample of 478 X-ray sources detected in the XMM-Newton and Chandra
surveys of the central 0.6deg2 of the ELAIS-S1 field. The most
likely optical/infrared counterpart of each X-ray source was
identified using the chance coincidence probability in the R and IRAC
3.6 micron bands.This method was complemented by the precise positions
obtained through Chandra observations. We were able to associate a
counterpart to each X-ray source in the catalogue. Approximately 94%
of them are detected in the R band, while the remaining are blank
fields in the optical down to R∼24.5, but have a near-infrared
counterpart detected by IRAC within 6 arcsec from the XMM-Newton
centroid. The multi-band catalogue, produced using the positions of
the identified optical counterparts, contains photometry in ten
photometric bands, from B to the MIPS 24 micron band. The
spectroscopic follow-up allowed us to determine the redshift and
classification for 237 sources (∼50% of the sample) brighter than
R=24. The spectroscopic redshifts were complemented by reliable
photometric redshifts for 68 sources.
We classified 47% of the sources with spectroscopic redshift as
broad-line active galactic nuclei (BL AGNs) with z=0.1-3.5, while
sources without broad-lines (NOT BL AGNs) are about 46% of the
spectroscopic sample and are found up to z=2.6. The remaining
fraction is represented by extended X-ray sources and stars. We
spectroscopically identified 11 type 2 QSOs among the sources with
X/O>8, with redshift between 0.9 and 2.6, high 2-10keV luminosity
(logLx≥43.8erg/s) and hard X-ray colors suggesting large absorbing
columns at the rest frame (logNH up to 23.6cm-2). BL AGNs show on
average blue optical-to-near-infrared colors, softer X-ray colors and
X-ray-to-optical colors typical of optically selected AGNs.
Conversely, narrow-line sources show redder optical colors, harder
X-ray flux ratio and span a wider range of X-ray-to-optical colors.
On average the Spectral Energy Distributions (SEDs) of high-luminosity
BL AGNs resemble the power-law typical of unobscured AGNs.
The SEDs of NOT BLAGNs are dominated by the galaxy emission in the
optical/near-infrared, and show a rise in the mid-infrared which
suggests the presence of an obscured active nucleus. We study the
infrared-to-optical colors and near-infrared SEDs to infer the
properties of the AGN host galaxies.
Description:
Identifications and photometric parameters for 478 sources detected by
XMM-Newton in the ELAIS-S1 field are given. For each source we give:
X-ray positions and fluxes, optical position and photometry, Spitzer
IRAC and MIPS 24 micron positions and fluxes, spectroscopic redshift
where available, photometric redshift and SED shape classification.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 575 478 Multiband catalog
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See also:
J/A+A/457/501 : XMM-Newton survey of the ELAIS-S1 field (Puccetti+, 2006)
J/A+A/451/881 : ESIS BVR catalog, ELAIS-S1 (Berta+, 2006)
J/A+A/476/151 : SWIRE ELAIS-S1 IR-peak galaxy IR fluxes (Berta+, 2007)
J/A+A/488/533 : ESIS VIMOS I,z photometry of ELAIS-S1 (Berta+, 2008)
J/AJ/127/3075 : Mid-infrared population of ELAIS-S1 sample (La Franca+, 2004)
J/MNRAS/325/1173 : ISO ELAIS 15µm survey (Lari+, 2001)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- XMMES1 [1/479] XMM sequential number
5- 11 F7.5 deg RAdeg XMM Right ascension (J2000.0)
13- 21 F9.5 deg DEdeg XMM Declination (J2000.0)
23- 34 E12.7 mW/m2 FX0.5-10 Flux 0.5-10keV
36- 40 F5.2 --- SN0.5-10 S/N in 0.5-10keV band
42- 53 E12.7 mW/m2 e_FX0.5-10 ?=99.0 Error on Flux 0.5-10keV
55- 66 E12.7 mW/m2 FX2-10 Flux 2-10keV band
68- 72 F5.2 --- SN2-10 S/N in 2-10keV band
74- 85 E12.7 mW/m2 e_FX2-10 ?=99.0 Error on Flux 2-10keV
87- 98 E12.7 mW/m2 FX0.5-2 Flux 0.5-2keV band
100-104 F5.2 --- SNX0.5-2 S/N in 0.5-2keV band
106-117 E12.7 mW/m2 e_FX0.5-2 ?=99.0 Error on Flux 0.5-2keV
119-130 E12.7 mW/m2 FX5-10 Flux 5-10 keV band
132-135 F4.2 --- SNFX5-10 S/N in 5-10keV band
137-148 E12.7 mW/m2 e_FX5-10 ?=99.0 Error on Flux 5-10keV
150-153 I4 --- Chandra ?=-999 Chandra ID
155-163 F9.6 deg RACdeg ?=-9.9999 Chandra Right ascension (J2000.0)
165-173 F9.5 deg DECdeg ?=-99. Chandra Declination (J2000.0)
175 I1 --- covCh [0/1] Flag, if area is covered by Chandra
observations (1=yes, 0=no)
177-182 I6 --- ESIS ?=0 ID in ESIS catalog
184-195 F12.9 deg RAEdeg ?=-9.9999 Right ascension (J2000.0)
in ESIS catalog
199-211 F13.9 deg DEEdeg ?=-99. Declination (J2000.0) in ESIS catalog
213 A1 --- l_BmagE Limit flag on BmagE
214-219 F6.3 mag BmagE ?=99.0 B band magnitude (Vega) from ESIS
catalog
221-227 F7.4 mag e_BmagE ?=99.0 B mag error
229 A1 --- l_VmagE Limit flag on VmagE
230-235 F6.3 mag VmagE ?=99.0 V band magnitude (Vega) from
ESIS catalog
237-243 F7.4 mag e_VmagE ?=99.0 V mag error
245 A1 --- l_RmagE Limit flag on RmagE
246-251 F6.3 mag RmagE ?=99.0 R band magnitude (Vega) from
ESIS catalog
253-259 F7.4 mag e_RmagE ?=99.0 R mag error
261-270 F10.7 deg RAVdeg ?=99. VIMOS/VLT Right ascension (J2000.0)
272-282 F11.7 deg DEVdeg ?=99. VIMOS/VLT Declination (J2000.0)
284 A1 --- l_RmagBest Limit flag on RmagBest
285-289 F5.2 mag RmagBest ?=99. R band magnitude (Vega) from VIMOS
(mag_best)
291-295 F5.2 mag e_RmagBest ?=99.0 R mag error
297-303 F7.4 --- Rell ?=99.0 Ellipticity in R band
305-306 I2 --- Rflg ?=99 Sextractor flags in R band
308-314 F7.2 --- Rs/g ?=99.0 Star/galaxy separation in R band
(0 for galaxy)
316-320 F5.3 --- ProbOpt Chance coincidence probability (R band)
322-326 F5.2 arcsec DXOpt ?=99.0 X-ray to optical position offset
329-337 F9.6 deg RAOdeg ?=-99.0 J-band Right ascension (J2000.0)
339-347 F9.5 deg DEOdeg ?=-99.0 J-band Declination (J2000.0)
349-353 F5.2 mag JmagBest ?=99.0 J band magnitude (Vega)
355-359 F5.2 mag e_JmagBest ?=99.0 J mag error
361 A1 --- l_Kmag Limit flag on Kmag
362-366 F5.2 mag Kmag ?=99.0 K band magnitude (Vega) (mag_best)
368-374 F7.4 mag e_Kmag ?=99.0 K mag error
376-384 F9.4 --- Kell ?=99.0 Ellipticity in K band
386-387 I2 --- Kflg ?=99 Sextractor flags in K band
389-393 F5.2 --- Ks/g ?=99.0 Star/galaxy separation in K band
(0 for galaxy)
395-400 I6 --- IRAC ?=0 Swire IRAC ID
402-411 F10.6 deg RAIdeg ?=-99.0 IRAC Right ascension (J2000.0)
413-421 F9.5 deg DEIdeg ?=-99.0 IRAC Declination (J2000.0)
423-430 F8.2 uJy F3.6um ?=-999.0 IRAC 3.6um flux
432-436 F5.2 uJy e_F3.6um ?=99.0 IRAC 3.6um flux error
437-445 F9.2 uJy F4.5um ?=-999.0 IRAC 4.5um flux
447-451 F5.2 uJy e_F4.5um ?=99.0 IRAC 4.5um flux error
453-460 F8.2 uJy F5.8um ?=-999.0 IRAC 5.8um flux
462-466 F5.2 uJy e_F5.8um ?=99.0 IRAC 5.8um flux error
468-475 F8.2 uJy F8.0um ?=-999.0 IRAC 8.0um flux
478-482 F5.2 uJy e_F8.0um ?=99.0 IRAC 8.0um flux error
484-491 F8.2 uJy F24um ?=-999.0 MIPS 24um flux
494-498 F5.2 uJy e_F24um ?=99.0 MIPS 24um flux error
500-504 F5.2 arcsec DXIR ?=-9.0 X-ray to IRAC position offset
506-511 F6.3 --- ProbIR ?=-9.0 Chance coincidence probability
(IRAC 3.6 micron)
513-515 F3.1 --- Tel Photometry from : 2.2=ESO/WFI 8.0=VIMOS/VLT
517-520 I4 --- SpID Spectrum ID (unexplained)
522-526 I5 --- SpCode Spectrum code (unexplained)
528-534 F7.4 --- z ?=-9.0 or -1.0 Spectroscopic redshift
536-539 F4.1 --- q_z ?=-9.0 Redshift quality flag (1)
541-542 I2 --- Class ?=-9.0 Classification (2)
544-546 I3 --- Inst Instrument (3)
548-549 I2 --- SED ?=0 SED classification (4)
551-557 F7.4 --- zpho ?=-1.0 Best fit Photometric redshift
559-575 E17.8 --- chi2 ?=0.0 Chi squared for Photometric redshift fit
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Note (1): Spectroscopic redshift quality flag as follows:
2 = secure
1 = only 1 emission line
<1 = tentative
Note (2): Classification as follows:
1 = type 1 AGN
2 = emission line galaxy
3 = galaxy without emission lines
4 = star
5 = type 2 AGN
6 = galaxies associated to extended sources (clusters)
Note (3): Instrument code as follows:
15 = spectra of bright sources from La Franca et al. (2004,
Cat. J/AJ/127/3075
73 = VIMOS/VLT
75 = VIMOS/VLT
77 = FORS2/VLT
78 = FORS2/VLT
360 = EFOSC/VLT
Note (4): SED classification as follows:
0 = no classification
2 = early-type-like
3 = infrared excess
4 = infrared excess
5 = dominated by emission features
11 = optically blue power-law
12 = optically red power-law
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Acknowledgements:
Chiara Feruglio, chiara.feruglio(at)cea.fr
(End) Chiara Feruglio [CEA, France], Patricia Vannier [CDS] 29-Jul-2008