J/ApJ/252/102 Radio sources in bright spiral galaxies. II. (Condon+, 1982)
Strong radio sources in bright spiral galaxies. II.
Rapid star formation and galaxy-galaxy interactions.
Condon J.J., Condon M.A., Gisler G., Puschell J.J.
<Astrophys. J. 252, 102 (1982)>
=1982ApJ...252..102C 1982ApJ...252..102C
ADC_Keywords: Radio sources
Keywords: interferometry - galaxies : nuclei - galaxies : structure -
radio sources : galaxies - radio sources : spectra
Abstract:
Statistically complete samples comprising 33 bright spiral galaxies
that are strong radio sources were selected. Sixteen of the galaxies
have integrated radio-to-optical flux ratios greater than 10 times the
median value for normal spirals. The remainder contain radio cores
≤20" in size and stronger than 90mJy at 1415MHz or 60mJy at 2695MHz.
High-resolution (2" at 1413MHz or 0.6" at 4885MHz) maps of these
galaxies were made with the Very Large Array. The radio sources are
usually confined to the central 1kpc of the galaxies, lying within and
extending parallel to their stellar disks. There is no evidence for
ejection from central components. Most of the sources appear to be
coextensive with regions of intense star formation (bolometric
luminosities ∼1010-1011L_☉). The typical radio luminosity,
∼1021W/Hz/sr at 1413MHz, of the resolved sources can be explained by
synchrotron radiation from supernova remnants (SNRs) produced at the
rate of ∼1/yr. Five of the radio sources are ≤1pc in size and
probably are not related to star formation or SNRs. The radio and
10-µm flux densities of the extended sources are roughly
proportional. The bolometric mass-to luminosity ratios in some active
regions are too low to have been maintained for a Hubble time. Nearly
all of the strong, extended radio sources are found in galaxies with
nearby companions, so most of the episodic bursts of star formation
are apparently triggered by galaxy-galaxy interactions.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 75 33 Complete radio-selected sample of galaxies
table2.dat 97 27 Contour map parameters
table3.dat 125 33 Positions
table5.dat 53 34 Radio core spectra
table6.dat 41 19 Infrared-radio flux ratios of radio-selected
galaxies
table7.dat 80 85 Galaxy-galaxy interaction
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- IAU IAU name (based on B1950 position)
10- 17 A8 --- Name NGC or IC name
20- 24 I5 --- UGC ? UGC (Cat. VII/26) number
26- 49 A24 --- OName Other names
52- 58 A7 --- Type Galaxy type, as in RC2 (Cat. VII/112)
61 A1 --- Asample [A] A: in A sample
63 A1 --- Bsample [B] B: in B sample
65 A1 --- Csample [C] C: in C sample
67 A1 --- Dsample [D] D: in D sample
69 A1 --- Esample [E] E: in E sample
71- 75 F5.1 Mpc Dist Distance
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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- 8 A8 --- IAU IAU name
10- 17 A8 --- Name NGC, IC or UGC name
20- 23 I4 MHz Freq Frequency
26- 29 F4.2 arcsec Size1 Clean beam size
31 A1 --- --- [x]
33- 36 F4.2 arcsec Size2 Clean beam size
39- 41 I3 deg PA Clean beam position angle
43- 46 I4 K Interval Coutour interval expressed in surface rightness
49- 97 A49 --- Levels Contour levels plotted
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name NGC, IC or UGC name
10- 13 I4 MHz Freq Frequency of the radio component
15 A1 --- l_Size Limit flag on Size
16- 18 F3.1 arcsec Size ? Size
19 A1 --- u_Size Uncertaitny flag on Size
20 A1 --- --- [x]
21- 23 F3.1 arcsec Size2 ? Size (Size x Size2)
25- 27 I3 deg PA ? Position angle
28- 30 A3 --- Comp Type of component (1)
32- 33 I2 h RAh Right ascension (B1950.0)
35- 36 I2 min RAm Right ascension (B1950.0)
38- 43 F6.3 s RAs Right ascension (B1950.0)
45- 48 F4.3 s e_RAs rms uncertainty on right ascension
50 A1 --- DE- Declination sign (B1950.0)
51- 52 I2 deg DEd Declination (B1950.0)
54- 55 I2 arcmin DEm Declination (B1950.0)
57- 61 F5.2 arcsec DEs Declination (B1950.0)
63- 65 F3.2 arcsec e_DEs rms uncertainty on DEs
67- 71 F5.2 s oRA ? Optical-minus-radio right ascension
difference
73- 76 F4.1 arcsec oDE ? Optical-minus-radio declination difference
77 A1 --- n_oRA [*] * = see text for oRA/oDE
78-127 A50 --- Ref References
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Note (1): Type of component:
C: centroid
P: peak
CP: central peak
CC: compact component
NWP: north-west peak
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Table 4: Major-axis orientations
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Galaxy D Position angle (deg)
deg Optical Radio
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NGC 253 3.8 51 47-58
NGC 520 2.5 95 91
NGC 660 2.2 37 45
NGC 2992 2.4 15 175-26
NGC 3034 2.2 65 72
NGC 3079 5.4 165 159
NGC 3628 3.6 104 103
NGC 4536 2.5 130 130
NGC 6240 2.4 20: 20
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name NGC or IC name
11- 12 I2 arcsec Size ? Region size
15- 18 I4 mJy S1413MHz ? Flux density at 1413MHz
20- 23 I4 mJy e_S1413MHz ? rms uncertainty on S1413MHz
26- 29 I4 mJy S4885MHz ? Flux density at 4885MHz
31- 32 I2 mJy e_S4885MHz ? rms uncertainty on S4885MHz
35- 39 A5 --- OFlux References to other fluxes (1)
41- 45 F5.2 --- Sp-Index ? Spectral index (-d(lnS)/d(lnν))
46 A1 --- u_Sp-Index Uncertainty flag on Sp-Index
47- 52 F6.2 10+21W/Hz/sr L1413 ? Radio spectral luminosity at 1413MHz
53 A1 --- u_L1413 Uncertainty flag on L1413
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Note (1): References to other fluxes densities used to determine the
spectral indices:
a: Dressel and Condon, 1978ApJS...36...53D 1978ApJS...36...53D
b: Condon and Dressel, 1978ApJ...221..456C 1978ApJ...221..456C
c: Condon, 1980ApJ...242..894C 1980ApJ...242..894C
d: Van der Kruit, 1973A&A....29..249V 1973A&A....29..249V
e: Becklin et al., 1980ApJ...236..441B 1980ApJ...236..441B
f: Hummel, 1980A&AS...41..151H 1980A&AS...41..151H
g: De Bruyn & Willis, 1974A&A....33..351D 1974A&A....33..351D
h: Seaquist, Davis & Bignell, 1978A&A....63..199S 1978A&A....63..199S
i: De Bruyn and Wilson, 1976A&A....53...93D 1976A&A....53...93D
j: Stocke, Tifft & Kaftan-Kassim, 1978AJ.....83..322S 1978AJ.....83..322S
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name NGC or IC name
11- 12 I2 arcsec Aper ? Aperture
14 A1 --- l_S10um Limit flag on S10um
15- 19 I5 mJy S10um Flux density at 10um
21 A1 --- r_S10um Reference for S10um (1)
24- 27 I4 mJy S1413MHz ? Flux density at 1413MHz
28 A1 --- u_S1413MHz Uncertainty flag on S1413MHz
30 A1 --- l_IR/Rad Limit flag on IR/Rad
31- 34 F4.1 --- IR/Rad ? Infrared-to-radio flux ratio
35 A1 --- u_IR/Rad Uncertainty flag on IR/Rad
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Note (1): References for S10um:
a: Rieke and Low, 1972ApJ...176L..95R 1972ApJ...176L..95R
b: Rieke and Low, 1975ApJ...197...17R 1975ApJ...197...17R
c: Becklin et al., 1980ApJ...236..441B 1980ApJ...236..441B
d: Rieke and Lebofsky, 1978ApJ...220L..37R 1978ApJ...220L..37R
e: Rieke, 1978, in Infrared Astronomy, ed. G. Setti & G. Fazio
(Dordrecht: Reidel), p. 159.
f: Puschell et al., 1983ApJ...265..625P 1983ApJ...265..625P
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Galaxy name
10 A1 --- ERS [V] V for extended radio source
12- 25 A14 --- Comp Companion(s)
27-100 A74 --- Note Evidence for interaction
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History:
Prepared via OCR.
Acknowledgements:
From Heinz A. Andernach (R143 in his list)
References:
Condon, Paper I 1980ApJ...242..894C 1980ApJ...242..894C
Condon, Paper III 1983ApJS...53..459C 1983ApJS...53..459C
(End) Patricia Bauer [CDS] 20-Nov-2003