J/MNRAS/424/2832 Pulsars in γ-ray sources (Lee+, 2012)
Application of the Gaussian mixture model in pulsar astronomy. Pulsar
classification and candidates ranking for the Fermi 2FGL catalogue.
Lee K.J., Guillemot L., Yue Y.L., Kramer M., Champion D.J.
<Mon. Not. R. Astron. Soc., 424, 2832-2840 (2012)>
=2012MNRAS.424.2832L 2012MNRAS.424.2832L
ADC_Keywords: Models ; Pulsars ; Photometry, classification ; Gamma rays
Keywords: methods: statistical - pulsars: general - gamma-rays: stars
Abstract:
Machine learning, algorithms designed to extract empirical knowledge
from data, can be used to classify data, which is one of the most
common tasks in observational astronomy. In this paper, we focus on
Bayesian data classification algorithms using the Gaussian mixture
model and show two applications in pulsar astronomy. After reviewing
the Gaussian mixture model and the related expectation-maximization
algorithm, we present a data classification method using the
Neyman-Pearson test. To demonstrate the method, we apply the
algorithm to two classification problems.
First, it is applied to the well-known period-period derivative
diagram. Our second example is to calculate the likelihood of
unidentified Fermi point sources being pulsars.
Description:
In table3, we list the 2FGL sources, where the pulsar likelihood is
presented and related parameters from 2FGL catalog are also given. The
sources are ranked according to the pulsar likelihood.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 145 1873 The source list sorted according to our likelihood
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See also:
J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [2FGL]
6- 18 A13 --- 2FGL 2FGL name, JHHMM.m+DDMMa (1)
21- 22 I2 h RAh Right ascension (J2000)
24- 25 I2 min RAm Right ascension (J2000)
27- 28 I2 s RAs [0/60] Right ascension (J2000)
31 A1 --- DE- Declination sign (J2000)
32- 33 I2 deg DEd Declination (J2000)
35- 36 I2 arcmin DEm Declination (J2000)
38- 39 I2 arcsec DEs Declination (J2000)
41- 48 F8.4 deg GLON Galactic longitude
51- 58 F8.4 deg GLAT Galactic latitude
61- 66 F6.4 deg emaj Semimajor axis of error ellipse at 68%
confidence level
71- 76 F6.4 deg emin Semiminor axis of error ellipse at 68%
confidence level
81- 88 E8.3 ph/cm+2/s Flux Photon flux for 1-100GeV
91- 95 F5.2 --- Sc Significance of the fit improvement using a
curved spectrum
100-108 E9.3 --- Var Variability index of the γ emission
111-117 F7.2 [-] logRs [-181/56] Likelihood ratio of being a pulsar
121-145 A25 --- ID Identified or likely associated source
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Note (1): 2FGL JHHMM.m+DDMM[c/e]. "c" indicates that based on the region of the
sky the source is considered to be potentially confused with Galactic diffuse
emission; "e" indicates a source that was modeled as spatially extended.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 13-May-2013