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J/ApJS/135/155      Radio identification of 3EG EGRET sources (Mattox+, 2001)

A quantitative evaluation of potential radio identifications for 3EG EGRET sources. Mattox J.R., Hartman R.C., Reimer O. <Astrophys. J. Suppl. Ser. 135, 155 (2001)> =2001ApJS..135..155M
ADC_Keywords: Gamma rays ; Radio sources ; Cross identifications Keywords: galaxies: active - gamma rays: observations - quasars: general Abstract: The method of Mattox et al. (1996ApJ...461..396M) for identifying EGRET sources with 5GHz radio sources has been applied to the 3EG EGRET catalog of Hartman et al. (1999, Cat. J/ApJS/123/79). Complete results are tabulated. We tabulate separately 46 EGRET sources with radio identifications which we expect to have a high probability of being correct. We suggest that these sources are appropriate for most studies of the properties of γ-ray blazars as a class. All but one of these 46 sources were classified by Hartman et al. (1999, Cat. J/ApJS/123/79) as high-confidence identifications; and the additional source was classified by Hartman et al. (1999, Cat. J/ApJS/123/79) as a plausible identification. We also tabulate separately 37 additional "plausible identifications of EGRET sources with radio sources." These less secure possibilities include the remaining 21 "high-confidence identifications" of Hartman et al. (1999, Cat. J/ApJS/123/79), three of the 27 "lower confidence potential blazar identifications" of Hartman et al. (1999, Cat. J/ApJS/123/79), and an additional 15 plausible identifications which have not been suggested previously. Many of these sources require new radio and optical observations to establish them as blazars. We suggest that the 23 "lower-confidence potential blazar identifications" of Hartman et al. (1999, Cat. J/ApJS/123/79) which we do not find plausible should not be used in studies of the properties of the EGRET blazars. For this analysis, we have made elliptical fits to the 95% confidence contours of the position uncertainty regions of the 3EG sources. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 141 366 Complete EGRET Identification Results table2.dat 91 46 EGRET Identifications with a High Probability of Being Correct table3.dat 96 39 Plausible EGRET Identifications table4.dat 64 271 Elliptical fits to the 95% confidence position contours of all 3EG EGRET sources
See also: VIII/13 : A new catalog of 53522 4.85GHz sources (Becker+ 1991) J/ApJ/481/95 : Radio identification of EGRET sources (Mattox+ 1997) J/ApJS/101/259 : The second EGRET catalog (Thompson+ 1995) J/ApJS/107/227 : Supplement to Second EGRET Catalog (Thompson+ 1996) J/ApJS/123/79 : Third EGRET catalog (3EG) (Hartman+, 1999) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- 3EG The J2000 3EG EGRET position name 12 A1 --- f_BName [aA] Flag on BName (1) 14- 34 A21 --- BName 3EG Blazar identification 36 A1 --- n_BName [bde] Note on BName (2) 38- 52 A15 --- RName Position name of potential radio counterpart 54 A1 --- f_RName [acfg] Flag on RName (3) 56- 69 A14 --- OName Other or common name for RName 71- 76 I6 mJy S4.85GHz ? Flux density at 4.85GHz from catalog of Becker et al., VIII/13 78- 81 F4.1 --- Sp+Index ? Radio spectral index (4) 83- 88 F6.1 arcmin R0 ? Characteristic angle (5) 90- 99 E10.4 --- eta ? Probability radio source is a γ-ray source (see equ. 6) 101-105 F5.1 arcmin Rad ? Angle between the EGRET position estimate and the radio position 107-111 F5.1 arcmin R95% ? The 95% confidence contour radius in the direction of the radio source 113 A1 --- l_Cont Limit flag on Cont 114-119 F6.3 % Cont ? EGRET position confidence contour at the radio position (6) 121-130 E10.4 --- LR ? Likelihood ratio (7) 132-141 E10.4 --- Prob ? The a posteriori probability that the identification is correct as determined with equ. 4
Note (1): A = Indicates that H-EG3 designated this as a high-confidence AGN identification. a = Indicates that H-EG3 designated this as a ``lower-confidence potential'' AGN identification. Note (2): b = The poor resolution of the single dish PMN survey does not provide for definitive results for radio sources near the LMC. d = The Cen A region is not resolved in the single dish PMN survey. Therefore, this study is not useful for judging the claim that EGRET source J1324-4314 is Cen A. e = EGRET source J1627-2419 is indicated by H-3EG as a possible artifact due to improper modeling of diffuse γ-ray emission of the ρ Oph cloud. Note (3): a = B0220+4245 is an extended radio source, making it an unlikely counterpart. c = EGRET sources J1308+8744 and J1621+8203 lie outside of a 5 GHz survey region. f = Radio source J1631-4015 corresponds to a planetary nebula. g = Radio source B2226+6122 corresponds to a Galactic H II region. Note (4): S(ν) ∝ να. Note (5): Angle between potentially confusing radio sources which are at least as bright and flat as this radio source (equation 3 of Mattox et al., 1997, Cat. J/ApJ/481/95). Note (6): See equation 6 of Mattox et al. 1997, Cat. J/ApJ/481/95. Ranges from 0% at the EGRET position estimate to 100% far away. Note (7): Indicating the strength of the indication for the identification (see equation 5).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- RName Radio name, as in table1. 17- 24 A8 --- Name Radio source name based on 1950 position 26- 29 F4.1 mag Omag ? Optical magnitude from NED 31- 35 I5 mJy S4.85GHz Flux density at 4.85GHz from catalog of Becker et al., VIII/13 37- 40 F4.1 --- Sp+Index Radio spectral index (2) 42 A1 --- l_SVLBI Limit flag on a SVLBI 43- 46 I4 mJy SVLBI ? VLBI flux density at 2.29 GHz 48- 50 I3 mJy e_SVLBI ? Uncertainty in SVLBI 52- 58 F7.5 --- Prob The a posteriori probability of a correct identification (3) 60- 64 F5.2 10-6ct/cm2/s Flux The γ-ray flux (E>100MeV) in units of 10-6cm-2s-1 66- 69 F4.2 10-6ct/cm2/s e_Flux Uncertainty in Flux 71 A1 --- l_z Limit flag on z 72- 77 F6.4 --- z ? Redshift 79- 90 A12 --- n_Name Further notes on Name
Note (2): S(ν) ∝ να. Note (3): See equation 10 of Mattox et al. 1997, Cat. J/ApJ/481/95)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 12 A12 --- RName Radio name, as in table1. 17- 25 A9 --- Name Radio source name, based on 1950 position 27 A1 --- f_Name [gh] Flag on Name (2) 29- 33 F5.2 mag Omag ? Optical magnitude from NED 35- 36 I2 h RAh Right Ascension (J2000) 38- 39 I2 min RAm Right Ascension (J2000) 41- 47 F7.4 s RAs Right Ascension (J2000) 50 A1 --- DE- Sign of the Declination (J2000) 51- 52 I2 deg DEd Declination (J2000) 54- 55 I2 arcmin DEm Declination (J2000) 57- 62 F6.3 arcsec DEs Declination (J2000) 65- 68 I4 mJy S4.85GHz Flux density at 4.85GHz from catalog of Becker et al., VIII/13 70- 73 F4.1 --- Sp+Index ? Radio spectral index (3) 75- 79 F5.3 --- Prob The a posteriori probability of a correct identification (eq. 4). 81 A1 --- f_Prob [f] Flag on Prob (4) 83- 94 A12 --- Morph The ``Morphological Type'' from NED 96 A1 --- f_Morph [aA] Flag on Morph (5)
Note (2): g = Both 1930-397 and 1933-400 are potential identifications of 3EG J1935-4022. h = Both 1936-155 and 1938-155 are potential identifications of 3EG J1937-1529. Note (3): S(ν) ∝ να. Note (4): f = The high confidence identification of 1219+285 by H-3EG is based on the E>1 GeV position of Lamb & Macomb (1997). Using their position result, we find Prob=0.04 for 1219+285. Note (5): A = Indicates that H-EG3 designated this source as a high-confidence EGRET identification. a = Indicates that H-EG3 designated this source as a ``lower-confidence potential'' EGRET identification.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 10 A10 --- 3EG The 3EG EGRET γ-ray position name 12- 17 F6.2 deg RAdeg Right Ascension expressed in degrees (J2000) 19- 24 F6.2 deg DEdeg Declination expressed in degrees (J2000) 26- 31 F6.2 deg GLON Galactic longitude 33- 38 F6.2 deg GLAT Galactic latitude 40- 44 F5.1 arcmin MajAxis Semi-major axis length 46- 50 F5.1 arcmin MinAxis Semi-minor axis length 52- 54 I3 deg PA Position angle of MajAxis 56- 57 A2 --- f_PA Flag on PA (1)
Note (1): a = A poor elliptical fit, a fit to a compromised map, or an anomalous error region. The elliptical fits should only be used with caution for these sources. b = The 68% contour is not centered in the 95% contour, causing an offset from the position of H-3EG.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 10-Sep-2001
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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