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J/AJ/109/2318 Extragalactic IRAS sources (Condon+ 1995) ============================================================================ Radio identifications of extragalactic IRAS sources Condon J.J., Anderson E., Broderick J.J. <Astron. J. 109, 2318 (1995)> 1995AJ....109.2318C ============================================================================ ADC_Keywords: Infrared sources ; Radio sourcesAbstract: Extragalactic sources detected at lambda=60um were selected from the IRAS Faint Source Catalog, Version 2 by the criterion S(60um)>=S(12um). They were identified by position coincidence with radio sources stronger than 25mJy at 4.85GHz in the 6.0sr declination band 0deg<Dec.<+75deg (excluding the 0.05sr region 12h40m<R.A.<14h40m, 0deg<Dec.<+5deg) and with radio sources stronger than 80mJy in the 3.4sr area 0h<R.A.<20h, -40deg<Dec.<0deg (plus the region 12h40m<R.A.<14h40m, 0deg<Dec.<+5deg). Fields containing new candidate identifications were mapped by the VLA at 4.86GHz with about 15" FWHM resolution. Difficult cases were confirmed or rejected with the aid of accurate (sigma~1") radio and optical positions. The final sample of 354 identifications in Omega=9.4sr is reliable and large enough to contain statistically useful numbers of radio-loud FIR galaxies and quasars. The logarithmic FIR/radio flux ratio parameter q can be used to distinguish radio sources powered by "starbursts" from those powered by "monsters." Starbursts and normal spiral galaxies in a lambda=60um flux-limited sample have a narrow (sigma_q=0.14+/-0.01) q distribution with mean <q>=2.74+/-0.01, and none have "warm" FIR spectra [alpha(25um, 60um)<1.5]. The absence of radio-quiet (but not completely silent) blazars indicates that nearly all blazars become optically thin at frequencies nu<~100GHz. Nonthermal sources with steep FIR/optical spectra and dust-embedded sources visible only at FIR and radio wavelengths must be very rare.
File Summary: ---------------------------------------------------------------------------- FileName Lrecl Records Explanations ---------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 97 354 Infrared and radio data table2.dat 96 354 Optical data and derived quantities ---------------------------------------------------------------------------- See also: II/156 : IRAS Faint Source Catalog, |b| > 10, Version 2.0 (Moshir+ 1989) VIII/14 : 87GB Catalog of radio sources (Gregory et al., 1991) Byte-by-byte Description of file: table1.dat ---------------------------------------------------------------------------- Bytes Format Units Label Explanations ---------------------------------------------------------------------------- 1- 11 A11 --- IRAS IRAS FSC2 name FHHMM.M+DDMM 13- 14 I2 h RAh IRAS FSC2 B1950 right ascension 16- 17 I2 min RAm IRAS FSC2 B1950 right ascension 19- 22 F4.1 s RAs IRAS FSC2 B1950 right ascension 24 A1 --- DE- IRAS FSC2 B1950 Declination sign 25- 26 I2 deg DEd IRAS FSC2 B1950 Declination 28- 29 I2 arcmin DEm IRAS FSC2 B1950 Declination 31- 32 I2 arcsec DEs IRAS FSC2 B1950 Declination 34 A1 --- l_S12 [< ] S12 upper limit symbol 35- 41 F7.3 Jy S12 IRAS 12 um flux density (1) 43 A1 --- l_S25 [< ] S25 upper limit symbol 44- 50 F7.3 Jy S25 IRAS 25 um flux density (1) 52 A1 --- l_S60 [< ] S60 upper limit symbol 53- 60 F8.3 Jy S60 IRAS 60 um flux density (1) 62 A1 --- l_S100 [< ] S100 upper limit symbol 63- 70 F8.3 Jy S100 IRAS 100 um flux density (1) 72- 73 I2 h RAh2 []? Radio B1950 right ascension 75- 76 I2 min RAm2 []? Radio B1950 right ascension 78- 81 F4.1 s RAs2 []? Radio B1950 right ascension 83 A1 --- DE-2 Radio B1950 Declination sign 84- 85 I2 deg DEd2 []? Radio B1950 Declination 87- 88 I2 arcmin DEm2 []? Radio B1950 Declination 90- 91 I2 arcsec DEs2 []? Radio B1950 Declination 92- 97 I6 mJy S4.85GHz []? 4.85 GHz flux density (2) ---------------------------------------------------------------------------- Note (1): Flux densities at 12, 25, 60, and 100um from (in descending order of preference) the IRAS Catalog of Large Optical Galaxies (Rice et al. VII/109) the revised IRAS Bright Galaxy Sample (Soifer et al. 1989AJ.....98..766S) the IRAS Small Scale Structures Catalog (Helou & Walker VII/73) and the FSC2 itself (Moshir et al. II/156) Note (2): 4.85GHz flux density from the 87GB source catalog (Gregory & Condon 1991 VIII/14) or measured from the 87GB or 90GB sky maps, and corrected for strong confusing sources visible in the 4.86GHz VLA maps. ---------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat ---------------------------------------------------------------------------- Bytes Format Units Label Explanations ---------------------------------------------------------------------------- 1- 11 A11 --- IRAS IRAS FSC2 name FHHMM.M+DDMM 13- 25 A13 --- Name Common name 27- 28 I2 h RAh []? Optical B1950 right ascension 30- 31 I2 min RAm []? Optical B1950 right ascension 33- 37 F5.2 s RAs []? Optical B1950 right ascension 39 A1 --- DE- Optical B1950 Declination sign 40- 41 I2 deg DEd []? Optical B1950 Declination 43- 44 I2 arcmin DEm []? Optical B1950 Declination 46- 49 F4.1 arcsec DEs []? Optical B1950 Declination 51- 58 A8 --- Type Identification morphology from the UGC 60- 63 F4.1 mag mp []? Apparent photographic magnitude 65- 70 F6.1 Mpc Dist []? Distance for H_0=50km/s/Mpc (1) 72 A1 --- l_q [<] Upper limit symbol for q 73- 77 F5.2 --- q Log FIR/radio flux-ratio parameter, 4.85 GHz 79- 83 F5.2 --- alp []? Radio spectral index between 1.4 and 5GHz 85 A1 --- l_alp_IR [>] Lower limit symbol for alp_IR 86- 90 F5.2 --- alp_IR FIR spectral index between 25-60 um 92- 96 A5 --- ES Energy source, S = stars, M = monster ---------------------------------------------------------------------------- Note (1): Distance from the Revised Shapley-Ames Catalog (Sandage & Tammann 1981 VII/51) or the Hubble distance based on H_0=50km/s/Mpc, q0=1/2. ---------------------------------------------------------------------------- Origin: AAS CD-ROM series, Volume 5, 1995 Lee Brotzman [ADS] 17-Jul-1995 ================================================================================ (End) [CDS] 23-Oct-1996 CDS Catalogue Service