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A Statistical Approach to Recognizing Source Classes for Unassociated Sources in the First FERMI-LAT CatalogThe Fermi Large Area Telescope (LAT) First Source Catalog (1FGL) provided spatial, spectral, and temporal properties for a large number of gamma -ray sources using a uniform analysis method. After correlating with the mostcomplete catalogs of source types known to emit gamma rays, 630 of these sources are "unassociated" (i.e., have no obvious counterparts at other wavelengths). Here, we employ two statistical analyses of the primary gamma-ray characteristics for these unassociated sources in an effort to correlate their gamma-ray properties with the active galactic nucleus (AGN) and pulsar populations in 1FGL. Based on the correlation results, we classify 221 AGN-like and 134 pulsar-like sources in the 1FGL unassociated sources. The results of these source "classifications" appear to match the expected source distributions, especially at high Galactic latitudes. While useful for planning future multiwavelength follow-up observations, these analyses use limited inputs, and their predictions should not be considered equivalent to "probable source classes" for these sources. We discuss multiwavelength results and catalog cross-correlations to date, and provide new source associations for 229 Fermi-LAT sources that had no association listed in the 1FGL catalog. By validating the source classifications against these new associations, we find that the new association matches the predicted source class in approximately 80% of the sources.
Document ID
20140010245
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1088/0004-637X/753/1/83
Authors
Ackermann, M. (Deutsches Elektronen-Synchrotron Zeuthen, Germany)
Ajello, M. (Kavli Inst. for Particle Astrophysics and Cosmology Stanford, CA, United States)
Allafort, A. (Kavli Inst. for Particle Astrophysics and Cosmology Stanford, CA, United States)
Antolini, E. (Istituto Nazionale di Fisica Nucleare Perugia, Italy)
Baldini, L. (Istituto Nazionale di Fisica Nucleare Pisa, Italy)
Ballet, J. (CEA Saclay, Service d'Astrophysique Gif-sur-Yvette, France)
Barbiellini, G. (Istituto Nazionale di Fisica Nucleare Trieste, Italy)
Bastieri, D. (Istituto Nazionale di Fisica Nucleare Padova, Italy)
Bellazzini, R. (Istituto Nazionale di Fisica Nucleare Pisa, Italy)
Berenji, B. (Kavli Inst. for Particle Astrophysics and Cosmology Stanford, CA, United States)
Blandford, R. D. (Kavli Inst. for Particle Astrophysics and Cosmology Stanford, CA, United States)
Bloom, E. D. (Kavli Inst. for Particle Astrophysics and Cosmology Stanford, CA, United States)
Bonamente, E. (Istituto Nazionale di Fisica Nucleare Perugia, Italy)
Borgland, A. W. (Kavli Inst. for Particle Astrophysics and Cosmology Stanford, CA, United States)
Bouvier, A. (California Univ. Santa Cruz, CA, United States)
Brandt, T. J. (Institut de Recherche en Astrophysique et Planetologie (UMR) Toulouse, France)
Celik, O. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
DeCesar, M. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ferrara, E. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gehrels, N. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Harding, A.K. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hays, E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
McEnery, J. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Thompson, D. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Troja, E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
July 29, 2014
Publication Date
June 15, 2012
Publication Information
Publication: The Astrophysical Journal
Publisher: THE AMERICAN ASTRONOMICAL SOCIETY
Volume: 753
Issue: 1
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN9282
Funding Number(s)
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
SOURCES
CLASSES
STATISTICAL

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