Access to Astronomical Catalogues

← Click to display the menu
J/MNRAS/424/L64     AGN/pulsar distinction for 2FGL sources  (Mirabal+, 2012)

Fermi's SIBYL: mining the gamma-ray sky for dark matter subhaloes. Mirabal N., Frias-martinez V., Hassan T., Frias-martinez E. <Mon. Not. R. Astron. Soc., 424, L64-L68 (2012)> =2012MNRAS.424L..64M
ADC_Keywords: Gamma rays ; Pulsars ; Active gal. nuclei Keywords: pulsars: general - galaxies: active - dark matter Abstract: Dark matter annihilation signals coming from Galactic subhaloes may account for a small fraction of unassociated point sources detected in the second Fermi-LAT Catalogue (2FGL). To investigate this possibility, we present SIBYL, a Random Forest classifier that offers predictions on class memberships for unassociated Fermi-LAT sources at high Galactic latitudes using gamma-ray features extracted from the 2FGL. SIBYL generates a large ensemble of classification trees that are trained to vote on whether a particular object is an active galactic nucleus (AGN) or a pulsar. After training on a list of 908 identified/associated 2FGL sources, SIBYL reaches individual accuracy rates of up to 97.7 per cent for AGNs and 96.5 per cent for pulsars. Predictions for the 269 unassociated 2FGL sources at |b|≥10° suggest that 216 are potential AGNs and 16 are potential pulsars (with majority votes greater than 70 per cent). The remaining 37 objects are inconclusive, but none is an extreme outlier. These results could guide future quests for dark matter Galactic subhaloes. Description: For our data set, we collected the complete Fermi-LAT 2FGL catalogue that consists of 1873 sources (100MeV-100GeV), of which 1300 are firmly identified/associated and 573 are unassociated sources (Ackermann et al., 2011, Cat. J/ApJ/743/171; Abdo et al., 2012, Cat. J/ApJS/199/31). In total, we consider a list that includes 800 labelled AGNs (BL Lacs and flat-spectrum radio quasars only) and 108 pulsars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 37 269 Predictions and voting percentages for unassociated Fermi sources in the 2FGL, ordered by RA
See also: J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011) J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012) J/MNRAS/428/220 : Gamma-ray AGN type determination (Hassan+, 2013) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [2FGL] 6- 18 A13 --- 2FGL 2FGL name, JHHMM.m+DDMMa 20- 24 F5.3 --- P(AGN) [0/1] Probability for AGN type 26- 30 F5.3 --- P(Psr) [0/1] Probability for Pulsar type 32- 37 A6 --- Pred Prediction (AGN or Pulsar)
History: Copied at
(End) Patricia Vannier [CDS] 06-Apr-2013
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© Université de Strasbourg/CNRS

    • Contact