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J/AJ/109/2318 Extragalactic IRAS sources (Condon+ 1995)
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Radio identifications of extragalactic IRAS sources
Condon J.J., Anderson E., Broderick J.J.
<Astron. J. 109, 2318 (1995)>
=1995AJ....109.2318C
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ADC_Keywords: Infrared sources ; Radio sources
Abstract:
Extragalactic sources detected at lambda=60um were selected from the
IRAS Faint Source Catalog, Version 2 <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 [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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 97 354 Infrared and radio data
table2.dat 96 354 Optical data and derived quantities
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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
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Bytes Format Units Label Explanations
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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)
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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.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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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.
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Origin: AAS CD-ROM series, Volume 5, 1995 Lee Brotzman [ADS] 17-Jul-1995
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(End) [CDS] 23-Oct-1996