J/ApJ/609/564 Blazar counterparts for 3EG sources (Sowards-Emmerd+, 2004)
Blazar counterparts for 3EG sources at -40°<Decl.<0°: pushing south through the bulge. Sowards-Emmerd D., Romani R.W., Michelson P.F., Ulvestad J.S. <Astrophys. J., 609, 564-575 (2004)> =2004ApJ...609..564S
ADC_Keywords: BL Lac objects ; Active gal. nuclei ; Redshifts ; Radio sources ; Gamma rays Keywords: BL Lacertae objects: general - galaxies: active - gamma rays: observations - radio continuum: galaxies - surveys Abstract: Supplementing existing survey data with Very Large Array (VLA) observations, we have extended γ-ray counterpart identifications down to decl.=-40° using our "figure-of-merit" approach. We find blazar counterparts for 70% of EGRET sources above decl.=-40° away from the Galaxy. Spectroscopic confirmation is in progress, and spectra for 24 sources are presented here. We find evidence that increased exposure in the bulge region allowed EGRET to detect relatively faint blazars; a clear excess of nonblazar objects in this region, however, argues for an additional (new) source class. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 114 139 3EG Objects table2.dat 84 102 VLA A-Array 8.4GHz Observations
See also: 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 Name (3EG designation, Cat. J/ApJS/123/79) 17 A1 --- n_3EG Note on 3EG (1) 25- 39 A15 --- RName Radio name 40- 44 I5 mJy S8.4GHz ? Flux density at 8.4GHz 45 A1 --- f_S8.4GHz [)] Flag on S8.4GHz (2) 47- 51 F5.2 --- Sp-Index ? Spectral Index 52 A1 --- f_Sp-Index [)] Flag on Sp-Index (2) 55- 59 F5.2 --- DelTS ? Statistical test value, ΔTS (3) 62- 66 F5.2 --- FoM ? Figure of Merit (4) 67 A1 --- f_FoM [)] Flag on FoM (2) 71- 75 F5.3 --- z ? Redshift (from optical observations) 78- 80 A3 --- PID PID, remarks on Redshift (5) 86 I1 --- RID ? Radio data origin (6) 94 A1 --- Mattox [±] Mattox et al. (2001, Cat. J/ApJS/135/155) selected blazars (7) 102 A1 --- EGRET [Aa] Third EGRET catalog (1999, Cat. J/ApJS/123/79) blazars (8) 110-111 A2 --- Class Classification of the source (9) 112 A1 --- f_Class [)] Flag on Class (2)
Note (1): The γ-ray source classification is defined as follows: N = nonblazar, b = plausible blazar ID, B = high-confidence blazar ID, G = likely Galactic. Note (2): A ")" indicates that the preceding entry is a predicted value extrapolating from 1.4/4.8 to 8.4GHz. Note (3): The TS (test statistic) is the maximum likelihood estimator used in the EGRET source catalog to quantify the probability that an EGRET point source is at a given location ; contours of ΔTS from the maximum define the source uncertainty region: ΔTS = TSmax-TS(α,δ) where (α,δ) is the counterpart candidate position. Note (4): The fractional excesses for each of the counterpart candidate's properties are combined with the estimate of the positional probability to compute a total "figure of merit" (FoM) for the source as a radio/X-ray counterpart: FoM=n8.4GHz*nα*nX-ray*L(α,δ) Note (5): New associations and/or redshifts: * indicates new spectral identification d indicates archival classification Note (6): Radio data origin is defined as follows: 0 = not observed, 1 = this VLA campaign, 2 = VLA calibrator survey, 3 = both (1+2). Note (7): Mattox et al. (2001, Cat. J/ApJS/135/155) selected blazars: + = high probability, - = plausible. Note (8): Third EGRET catalog (1999, Cat.J/ApJS/123/79) blazars: A = high confidence, a = lower confidence. Note (9): The classification of the source is defined as follows: b = BL Lac object, f = FSRQ (flat-spectrum radio quasars), r = NLRG (narrow-line radio galaxies), p = pulsar/plerion, G = likely Galactic, PN = planetary nebula.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- VLA VLA name (based on J2000 position) 15- 21 F7.2 mJy S8.4GHz ? VLA Flux at 8.4GHz 24- 29 F6.2 mJy e_S8.4GHz ? Error on S8.4GHz 33- 34 I2 h RAh ? Hour of right ascension (J2000.0) 36- 37 I2 min RAm ? Minute of right ascension (J2000.0) 39- 44 F6.3 s RAs ? Second of right ascension (J2000.0) 49 A1 --- DE- Sign of the declination (J2000.0) 50- 51 I2 deg DEd ? Degree of declination (J2000.0) 53- 54 I2 arcmin DEm ? Arcminute of declination (J2000.0) 56- 60 F5.2 arcsec DEs ? Arcsecond of declination (J2000.0) 65- 84 A20 --- Morph Source morphology (1)
Note (1): The source morphology is defined as follows: Jet = distinct jet Jet? = possible jet PN = planetary nebula A few known nonblazar sources are also indicated.
History: From electronic version of the journal References: Sowards-Emmerd et al., 2003ApJ...590..109S
(End) Marianne Brouty [CDS] 15-Mar-2005
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