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 sources Abstract: Extragalactic sources detected at lambda=60um were selected from the IRAS Faint Source Catalog, Version 2 (Cat. II/156) 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 [α(25um, 60um)<1.5]. The absence of radio-quiet (but not completely silent) blazars indicates that nearly all blazars become optically thin at frequencies ν≲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 RA2h ? Radio B1950 right ascension 75- 76 I2 min RA2m ? Radio B1950 right ascension 78- 81 F4.1 s RA2s ? Radio B1950 right ascension 83 A1 --- DE2- Radio B1950 Declination (sign) 84- 85 I2 deg DE2d ? Radio B1950 Declination 87- 88 I2 arcmin DE2m ? Radio B1950 Declination 90- 91 I2 arcsec DE2s ? 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., Cat. VII/109) the revised IRAS Bright Galaxy Sample (Soifer et al. 1989AJ.....98..766S) the IRAS Small Scale Structures Catalog (Helou & Walker, Cat. VII/73) and the FSC2 itself (Moshir et al., Cat. II/156) Note (2): 4.85GHz flux density from the 87GB source catalog (Gregory & Condon 1991, Cat. 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 assuming Ho=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_alpIR [>] Lower limit symbol for alpIR 86- 90 F5.2 --- alpIR 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, Cat. 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
|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|