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J/ApJ/707/L56          VLBI and bright Fermi/LAT sources         (Kovalev, 2009)

Identification of the early Fermi/LAT gamma-ray bright objects with extragalactic VLBI sources. Kovalev Y.Y. <Astrophys. J., 707, L56-L59 (2009)> =2009ApJ...707L..56K
ADC_Keywords: Gamma rays ; Radio continuum ; Cross identifications Keywords: catalogs - galaxies: active - gamma rays: observations - radio continuum: galaxies Abstract: A list of 205 γ-ray strong objects was reported recently as a result of a three-month integration with the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope. We attempted identification of these objects, cross-correlating the γ-ray positions with very long baseline interferometry (VLBI) positions of a large all-sky sample of extragalactic radio sources selected on the basis of their parsec-scale flux density. The original associations reported by the Fermi team are confirmed, and six new identifications are suggested. A Monte Carlo analysis shows that the fraction of chance associations in our analysis is less than 5%, and confirms that the vast majority of γ-ray bright extragalactic sources are radio-loud blazars with strong parsec-scale jets. A correlation between the parsec-scale radio and γ-ray flux is supported by our analysis of a complete VLBI flux-density-limited sample of extragalactic jets. The effectiveness of using a VLBI catalog to find associations between γ-ray detections and compact extragalactic radio sources, especially near the Galactic plane, is demonstrated. It is suggested that VLBI catalogs should be used for future identification of Fermi/LAT objects. Description: The full list of the 205 bright γ-ray sources presented by Abdo et al. (2009, Cat. J/ApJS/183/46; superseded by Cat. J/ApJS/188/405) includes both Galactic and extragalactic objects. We have successfully identified 111 VLBI sources out of the 205 Fermi/LAT sources. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 73 111 VLBI associations of the Fermi LAT bright sources
See also: I/251 : VLBI International Celestial Reference Frame (ICRF) (Ma+, 1997) J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010) J/ApJS/183/46 : Fermi/LAT bright gamma-ray source list (0FGL) (Abdo+, 2009) J/AJ/136/580 : Sixth VLBA calibrator survey: VCS6 (Petrov+, 2008) J/AJ/133/1236 : Fifth VLBA calibrator survey: VCS5 (Kovalev+, 2007) J/AJ/131/1872 : Fourth VLBA calibrator survey: VCS4 (Petrov+, 2006) J/AJ/129/1163 : Third VLBA calibrator survey: VCS3 (Petrov+, 2005) J/AJ/127/3587 : VLBI ICRF. II (Fey+, 2004) J/AJ/126/2562 : Second VLBA calibrator survey: VCS2 (Fomalont+, 2003) J/ApJS/141/13 : VLBA calibrator survey: VCS1 catalog (Beasley+, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [0FGL] 6- 17 A12 --- 0FGL Fermi LAT bright source name (JHHMM.m+DDMM) 19- 26 A8 --- VLBI IAU name (HHMM+DDd, B1950) of VLBI association (<IERS BHHMM+DDd> or <IVS BHHMM+DDd> in Simbad) 28- 32 F5.3 deg DP Fermi LAT and VLBI association position difference 34- 38 F5.3 deg R95 Fermi LAT 95% confidence radius 40- 41 I2 h RAh VLBI association Hour of Right ascension (J2000) 43- 44 I2 min RAm VLBI association Minute of Right ascension (J2000) 46- 52 F7.4 s RAs VLBI association Second of Right ascension (J2000) 54 A1 --- DE- VLBI association Sign of the Declination (J2000) 55- 56 I2 deg DEd VLBI association Degree of Declination (J2000) 58- 59 I2 arcmin DEm VLBI association Arcminute of Declination (J2000) 61- 67 F7.4 arcsec DEs VLBI association Arcsecond of Declination (J2000) 69- 73 F5.2 Jy S8 ? Total parsec-scale flux density at 8GHz
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Jan-2012
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

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