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J/ApJ/747/107       QSO Candidates in the MACHO LMC database (Kim+, 2012)

A refined QSO selection method using diagnostics tests: 663 QSO candidates in the Large Magellanic Cloud. Kim D.W., Protopapas P., Trichas M., Rowan-Robinson M., Khardon R., Alcock C., Byun Y.-I. <Astrophys. J. 747, 107 (2012)> =2012ApJ...747..107K
ADC_Keywords: QSOs ; Active gal. nuclei ; Magellanic Clouds ; Photometry, CCD ; X-ray sources ; Surveys Keywords: Magellanic Clouds - methods: data analysis - quasars: general Description: We present a catalog the 2566 QSO candidates in the MACHO LMC database. In these catalogs, we complied number of properties of the objects including RA, Dec, crossmatched IDs with several catalogs, magnitudes, photometric redshifts, etc. See Kim et al. (2011ApJ...735...68K) for the SVM (a.k.a. Support Vector Machine, a supervised machine learning algorithm) QSO classification model based on the time variability of lightcurves. We used the model to select the 2566 QSO candidates. In this work, we employed multiple diagnostics such as X-ray flux, mid-IR color and AGN SED fitting in order to select 663 promising QSO candidates among the 2,566 candidates. These candidates are flagged in the catalog. We calibrated the MACHO RA and Dec of the candidates using the UCAC3 catalog and improved the average astrometric accuracy from ∼3" to ∼0.5". File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 485 2566 QSO candidates in the LMC fields
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) I/284 : The USNO-B1.0 Catalog (Monet+ 2003) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) IX/41 : XMM-Newton Serendipitous Source Catalogue 2XMMi-DR3 (XMM-SSC, 2010) IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000) : MACHO Project Home Page Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 13 A13 --- MACHO MACHO ID (FFF.NNNNN.NNNN) 15- 22 F8.5 deg RAdeg Right Ascension (J2000) 24- 32 F9.5 deg DEdeg Declination (J2000) 34- 38 F5.2 mag VmagM MACHO apparent V magnitude 40- 44 F5.2 mag RmagM MACHO apparent R magnitude 46- 50 F5.2 --- Prob product of SVM probability of B and R bands 52- 56 F5.2 --- ProbB ? SVM probability of MACHO B band lightcurve 58- 62 F5.2 --- ProbR ? SVM probability of MACHO R band lightcurve 64- 72 F9.6 deg RA1deg ? USNOB1.0 Right Ascension (J2000) 74- 83 F10.6 deg DE1deg ? USNOB1.0 Declination (J2000) 85- 89 F5.2 mag RmagU ? USNOB1.0 apparent R magnitude 91-102 A12 --- USNOB1.0 USNOB1.0 ID (NNNN-NNNNNNNN) 104-109 F6.3 mag Umag ? Apparent U magnitude 111-115 F5.3 mag e_Umag ? Mean error on Umag 117-122 F6.3 mag Bmag ? Apparent B magnitude 124-128 F5.3 mag e_Bmag ? Mean error on Bmag 130-135 F6.3 mag Vmag ? Apparent V magnitude 137-141 F5.3 mag e_Vmag ? Mean error on Vmag 143-148 F6.3 mag Imag ? Apparent I magnitude 150-154 F5.3 mag e_Imag ? Mean error on Imag 156-171 A16 --- 2MASS 2MASS ID (HHMMSSss+DDMMSSs) 173-178 F6.3 mag Jmag ? 2MASS J magnitude 180-185 F6.3 mag e_Jmag ? Mean error on Jmag 187-192 F6.3 mag Hmag ? 2MASS H magnitude 194-199 F6.3 mag e_Hmag ? Mean error on Hmag 201-206 F6.3 mag Kmag ? 2MASS Ks magnitude 208-213 F6.3 mag e_Kmag ? Mean error on Kmag 215-224 I10 --- SAGE ? SAGE ID 226-231 F6.3 mag 3.6mag ? SAGE Spitzer/IRAC 3.6 magnitude 233-238 F6.3 mag e_3.6mag ? Mean error on 3.6mag 240-245 F6.3 mag 4.5mag ? SAGE Spitzer/IRAC 4.5 magnitude 247-252 F6.3 mag e_4.5mag ? Mean error on 4.5mag 254-259 F6.3 mag 5.8mag ? SAGE Spitzer/IRAC 5.8 magnitude 261-266 F6.3 mag e_5.8mag ? Mean error on 5.8mag 268-273 F6.3 mag 8.0mag ? SAGE Spitzer/IRAC 8.0 magnitude 275-280 F6.3 mag e_8.0mag ? Mean error on 8.0mag 282-297 A16 --- Chandra Chandra ID (JHHMMSS.s+DDMMSS) 299-308 E10.4 mW/m2 Flux1 ? Chandra flux in 0.5-2keV band 310-318 E9.3 mW/m2 Flux2 ? Chandra flux in 2-7keV band 320-340 A21 --- XMM XMM ID (2XMMJHHMMSS.s+DDMMSS, 2XMMiJHHMMSS.s+DDMMSS) 342-353 E12.4 mW/m2 Flux3 ? XMM flux in 0.5-2keV band 355-364 E10.4 mW/m2 Flux4 ? XMM flux in 2-4.5keV band 366-375 E10.4 mW/m2 Flux5 ? XMM flux in 4.5-12keV band 377-392 A16 --- 1RXS ROSAT All-Sky Survey faint source ID (JHHMMSS.s+DDMMSS) 394-397 F4.2 --- zph ? Photometric redshift 399-410 F12.10 10-7W LXChandra ? Chandra luminosity 412-432 E21.16 10-7W LXXMM ? XMM luminosity 434-437 A4 --- fSAGE SAGE flag (1) 439 A1 --- fstellar [ABN] Stellar flag (2) 441 A1 --- fphoto [GNQ] Photometric-redshift flag (3) 443-448 F6.2 --- fchi2 ?=-1 From SED fitting (-1 = No fitting) 450-451 A2 --- fXray X-ray source flag (4) 453 I1 --- fconf [1]? 1: high confidence QSOs 455-468 A14 --- OQSO Crossmatched QSOs (lmc.fff.f.nnnnn) (5) 470-485 A16 --- Onon-QSO Crossmatched QSOs (lmc.fff.f.nnnnn) (6)
Note (1): Combination of QSO, YSO, OUT and A, B, C. OUT and C means outside the AGN regions (Kozlowski & Kochanek, 2009, Cat. J/ApJ/701/508). NOCP means "No Counterparts". Note (2): Stellar flag as follows: A = non-stellar (QSO, AGN, galaxy) B = stellar N = No Counterpart Note (3): Photometric-redshift flag as follows: Q = QSO G = Galaxy S = Star N = No Counterpart Note (4): X-ray source flag is a combination of: X = XMM source C = Chandra source Q = QSO A = AGN G = Galaxy N = No Counterpart Note (5): Using newly confirmed QSOs from Kozlowski et al., 2012ApJ...746...27K. For details, see paper. Note (6): Using newly confirmed non-QSOs from Kozlowski et al., 2012ApJ...746...27K). For details, see paper.
Acknowledgements: Dae-Won Kim, dakim(at), Harvard-Smithsonian Center for Astrophysics References: Kim et al., Quasi-stellar object selection algorithm using time variability and machine learning 2011ApJ...735...68K
(End) Dae-Won Kim [H-SCA], Patricia Vannier [CDS] 24-Feb-2012
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