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 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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 485 2566 QSO candidates in the LMC fields
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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)
http://wwwmacho.anu.edu.au/ : MACHO Project Home Page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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)
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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 2012ApJ...746...27K.
For details, see paper.
Note (6): Using newly confirmed non-QSOs from Kozlowski et al.,
2012ApJ...746...27K 2012ApJ...746...27K). For details, see paper.
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Acknowledgements:
Dae-Won Kim, dakim(at)cfa.harvard.edu,
Harvard-Smithsonian Center for Astrophysics
References:
Kim et al., Quasi-stellar object selection algorithm using time variability
and machine learning 2011ApJ...735...68K 2011ApJ...735...68K
(End) Dae-Won Kim [H-SCA], Patricia Vannier [CDS] 24-Feb-2012