J/MNRAS/458/3479 SVM selection of WISE YSO Candidates (Marton+, 2016)
An all-sky support vector machine selection of WISE YSO Candidates.
Marton G., Toth L. V., Paladini R., Kun M., Zahorecz S., McGehee P., Kiss C.
<Mon. Not. R. Astron. Soc. 458, 3479 (2016)>
=2016MNRAS.458.3479M 2016MNRAS.458.3479M (SIMBAD/NED BibCode)
ADC_Keywords: Protostars ; YSOs ; Photometry
Keywords: methods: data analysis - methods: statistical -
stars: pre-main-sequence - stars: protostars - infrared: general -
infrared: stars
Abstract:
We explored the AllWISE catalogue of the Wide-field Infrared Survey
Explorer mission and identified Young Stellar Object candidates.
Reliable 2MASS and WISE photometric data combined with Planck dust
opacity values were used to build our dataset and to find the best
classification scheme. A sophisticated statistical method, the Support
Vector Machine (SVM) is used to analyse the multi-dimensional data
space and to remove source types identified as contaminants
(extragalactic sources, main sequence stars, evolved stars and sources
related to the interstellar medium). Objects listed in the SIMBAD
database are used to identify the already known sources and to train
our method. A new all-sky selection of 133,980 Class I/II YSO
candidates is presented. The estimated contamination was found to be
well below 1% based on comparison with our SIMBAD training set. We
also compare our results to that of existing methods and catalogues.
The SVM selection process successfully identified >90% of the Class
I/II YSOs based on comparison with photometric and spectroscopic YSO
catalogues. Our conclusion is that by using the SVM, our
classification is able to identify more known YSOs of the training
sample than other methods based on colour-colour and magnitude-colour
selection. The distribution of the YSO candidates well correlates with
that of the Planck Galactic Cold Clumps in the
Taurus-Auriga-Perseus-California region.
Description:
Two tables containing information on 133,980 Class I/II YSO candidates
and 608,606 Class III+ candidates, selected with Support Vector
Machine from the AllWISE data release. Data are photometry and quality
indicators as listed in the AllWISE catalogue and used during the
classification process. Additional columns are the SIMBAD identifiers,
the SIMBAD main type of the objects (where a counterpart was found
within 5" radius with respect to the AllWISE position) and the
distance between the AllWISE position and the SIMBAD position. The
last column lists the Planck R1.2 dust optical depth value (Planck
Collaboration, 2014) estimated at the position of each source.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
clasi-ii.dat 354 133980 Class I/II YSO candidates
clasiii.dat 354 608606 Class III and more evolved YSO candidates
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Byte-by-byte Description of file: clasi-ii.dat clasiii.dat
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Bytes Format Units Label Explanations
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1- 20 A20 --- Name AllWISE Identifier
22- 32 F11.7 deg RAdeg Right ascension (J2000.0)
34- 44 F11.7 deg DEdeg Declination (J2000.0)
46- 56 F11.7 deg GLON Galactic longitude
58- 68 F11.7 deg GLAT Galactic latitude
70- 75 F6.3 mag W1mag Instrumental profile-fit photometry
magnitude, band 1
77- 81 F5.3 mag e_W1mag Instrumental profile-fit photometry flux
uncertainty in mag units, band 1
83- 87 F5.1 --- W1snr Instrumental profile-fit photometry
S/N ratio, band 1
89-100 F12.7 --- w1rchi2 Instrumental profile-fit photometry reduced
chi2, band 1
102-107 F6.3 mag W2mag Instrumental profile-fit photometry
magnitude, band
109-113 F5.3 mag e_W2mag Instrumental profile-fit photometry
flux uncertainty in mag units, band 2
115-120 F6.1 --- W2snr Instrumental profile-fit photometry
S/N ratio, band 2
122-133 F12.7 --- W2rchi2 Instrumental profile-fit photometry
reduced chi^2, band 2
135-140 F6.3 mag W3mag Instrumental profile-fit photometry
magnitude, band 3
142-146 F5.3 mag e_W3mag Instrumental profile-fit photometry
flux uncertainty in mag units, band 3
148-152 F5.1 --- W3snr Instrumental profile-fit photometry
S/N ratio, band 3
154-165 F12.7 --- W3rchi2 Instrumental profile-fit photometry
reduced chi^2, band 3
167-172 F6.3 mag W4mag Instrumental profile-fit photometry
magnitude, band 4
174-178 F5.3 mag e_W4mag Instrumental profile-fit photometry
flux uncertainty in mag units, band 4
180-185 F6.1 --- W4snr Instrumental profile-fit photometry
S/N ratio, band 4
187-198 F12.7 --- W4rchi2 ?=- Instrumental profile-fit photometry
reduced chi^2, band 4
200-211 F12.7 --- rchi2 ?=- Instrumental profile-fit photometry
reduced chi squared, total
213 I1 --- extflag Probability that source morphology is not
consistent with single PSF
215-218 A4 --- phQual Photometric quality of each band
(A=highest, U=upper limit)
220-222 I3 --- W1nm Number of profile-fit flux measurements for
source with SNR ≥ 3, band 1
224-226 I3 --- W1m Number of profile-fit flux measurements for
source, band 1
228-230 I3 --- W2nm Number of profile-fit flux measurements for
source with SNR ≥ 3, band 2
232-234 I3 --- W2m Number of profile-fit flux measurements for
source, band 2
236-238 I3 --- W3nm Number of profile-fit flux measurements for
source with SNR ≥ 3, band 3
240-242 I3 --- W3m Number of profile-fit flux measurements for
source, band 3
244-246 I3 --- W4nm Number of profile-fit flux measurements for
source with SNR ≥ 3, band
248-250 I3 --- W4m Number of profile-fit flux measurements for
source, band 4
252-261 I10 --- 2MASSKey Closest associated 2MASS All-Sky Release
PSC key
263-268 F6.3 mag Jmag J magnitude entry of the associated
2MASS All-Sky PSC source
270-274 F5.3 mag e_Jmag J photometric uncertainty of the associated
2MASS All-Sky PSC source
276-281 F6.3 mag Hmag H magnitude entry of the associated
2MASS All-Sky PSC source
283-287 F5.3 mag e_Hmag H photometric uncertainty of the associated
2MASS All-Sky PSC source
289-294 F6.3 mag Ksmag Ks magnitude entry of the associated
2MASS All-Sky PSC source
296-300 F5.3 mag e_Ksmag Ks photometric uncertainty of the associated
2MASS All-Sky PSC source
302-334 A33 --- SName Source identifier as listed in SIMBAD (1)
336-338 A3 --- SType SIMBAD maintype of the identified source (1)
340-344 F5.3 arcsec SDist ?=0 Angular distance between AllWISE position
and the SIMBAD counterpart (1)
346-354 F9.7 --- tau Optical depth at 353GHz from Planck
HFICompMapThermalDustModel2048R1.20.fits
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Note (1): SIMBAD identification of the AllWISE sources for this table was
done on 22/02/2016.
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Acknowledgements:
Gabor Marton, marton.gabor(at)csfk.mta.hu
(End) G. Marton [MTA CSFK, Budapest, Hungary], P. Vannier [CDS] 24-Feb-2016