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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 575 478 Multiband catalog
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
Bytes Format Units Label Explanations
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
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
Acknowledgements: Chiara Feruglio, chiara.feruglio(at)cea.fr
(End) Chiara Feruglio [CEA, France], Patricia Vannier [CDS] 29-Jul-2008
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