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J/ApJS/133/77 VLA radio continuum survey of Seyfert galaxies (Ho+, 2001)
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Radio continuum survey of an optically selected sample of nearby
Seyfert galaxies.
Ho L.C., Ulvestad J.S.
<Astrophys. J. Suppl. Ser. 133, 77 (2001)>
=2001ApJS..133...77H
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ADC_Keywords: Galaxies, Seyfert ; Galaxies, nearby ; Radio lines
Keywords: galaxies: active - galaxies: jets - galaxies: nuclei -
galaxies: Seyfert - galaxies: structure - radio continuum: galaxies
Abstract:
We have used the Very Large Array (VLA) to conduct a survey for radio
continuum emission in the sample of 52 Seyfert nuclei selected from
the optical spectroscopic galaxy catalog of Ho, Filippenko, & Sargent
(1995, Cat. <J/ApJS/98/477>. This Seyfert sample is the most complete
and least biased available, and, as such, it will be useful for a
variety of statistical analyses. Here we present the observations,
measurements, and an atlas of radio maps. The observations were made
at 6 cm in the B array and at 20 cm in the A array, yielding matched
angular resolutions of ~1". We detected 44 objects (85%) at 6 cm and
37 objects (71%) at 20 cm above a 3{sigma} threshold of 0.12mJy/beam.
The sources have a wide range of radio powers (P~10^19^-10^25^W/Hz),
spectral indices ({alpha}^20^_6_~+0.5 to 1), and linear sizes (L~few
tens pc - 15kpc). The morphology of the radio emission is
predominantly that of a compact core, either unresolved or slightly
resolved, occasionally accompanied by elongated, jetlike features.
Linearly polarized emission was detected at 6 cm in 12 sources, nine
of which were also detected at 20 cm.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 90 54 The Galaxy Sample
table3.dat 147 132 Radio Measurements
table4.dat 43 134 Background Sources
table5.dat 90 52 Summary
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See also:
J/ApJS/98/477 : Optical spectral atlas of Seyfert nuclei (Ho+ 1995)
J/ApJS/112/315 : Spectroscopic parameters of Seyfert nuclei (Ho+ 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Galaxy name
10 A1 --- f_Name [a] Indicates not formally part of the
Seyfert sample
12- 20 A9 --- Class AGN Class (1)
22- 31 A10 --- HType Hubble type
33- 36 F4.1 --- TType Morphological type index
38- 42 F5.2 mag Bmag Total B band magnitude
44- 47 F4.1 Mpc Dist Adopted distance
49- 50 I2 h RAh Right Ascension (J2000)
52- 53 I2 min RAm Right Ascension (J2000)
55- 60 F6.3 s RAs Right Ascension (J2000)
62- 66 F5.3 s e_RAs Uncertainty in RAs
68 A1 --- DE- Sign of the Declination (J2000)
69- 70 I2 deg DEd Declination (J2000)
72- 73 I2 arcmin DEm Declination (J2000)
75- 79 F5.2 arcsec DEs Declination (J2000)
81- 84 F4.2 arcsec e_DEs Uncertainty in DEs
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Note (1): Classifications deemed to be uncertain or highly uncertain are
followed by a single and double colon, respectively. The symbols have
the following meaning:
L = LINER,
T = ``transition object'' (LINER + H II nucleus), and
S = Seyfert.
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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 Galaxy name
10 A1 --- f_Name Indicates archival data (1)
12- 17 A6 --- Fig Figure number for maps
19- 20 A2 --- Obs Indicates what the observation is of (2)
22- 25 F4.2 arcsec aBeam ? FWHM major axis of elliptical Gaussian
restoring beam
26 A1 --- --- [x]
27- 30 F4.2 arcsec bBeam ? FWHM minor axis of elliptical Gaussian
restoring beam
32- 34 I3 deg PA ? Position Angle of the restoring beam
36- 40 F5.3 mJy RMS6cm ? The rms noise of the 6cm map (mJy/beam)
42- 46 F5.3 mJy RMS20cm ? The rms noise of the 20cm map (mJy/beam)
48- 49 I2 h RAh ? Right Ascension (J2000)
51- 52 I2 min RAm ? Right Ascension (J2000)
54- 59 F6.3 s RAs ? Right Ascension (J2000)
61 A1 --- DE- Sign of the Declination (J2000)
62- 63 I2 deg DEd ? Declination (J2000)
65- 66 I2 arcmin DEm ? Declination (J2000)
68- 72 F5.2 arcsec DEs ? Declination (J2000)
74 A1 --- l_Sp6cm Limit flag on Sp6cm
75- 82 F8.2 mJy Sp6cm ? Peak flux density at 6cm (mJy/beam)
84- 91 F8.2 mJy Si6cm ? Integrated flux density at 6cm
93 A1 --- l_Sp20cm Limit flag on Sp20cm
94-101 F8.2 mJy Sp20cm ? Peak flux density at 20cm (mJy/beam)
103-110 F8.2 mJy Si20cm ? Integrated flux density at 20cm
112-116 F5.2 --- S+Index ? Spectral index between 6 and 20cm (3)
118 A1 --- l_aFWHM Limit flag on FWHM dimensions
119-122 F4.2 arcsec aFWHM ? Deconvolved FWHM major axis of the
fitted source
123 A1 --- --- [x]
124-127 F4.2 arcsec bFWHM ? Deconvolved FWHM minor axis of the
fitted source
129-131 I3 deg PAfit ? Position Angle of fitted source
133 A1 --- l_Splp6cm Limit flag on Splp6cm
134-138 F5.3 mJy Splp6cm ? 6cm peak linearly-polarized flux density
(mJy/beam)
140 A1 --- l_Splp20cm Limit flag on Splp20cm
141-146 F6.3 mJy Splp20cm ? 20cm peak linearly-polarized flux density
(mJy/beam)
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Note (1): Archival data:
c = Based on observations by Kaufman et al., 1996AJ....112.1021K
d = Based on 6cm C-array observations by Wrobel & Heeschen,
1991AJ....101..148W, and 20cm A-array observations by
Nagar et al., 1999ApJS..120..209N
Note (2): Part observed:
s = source
c = core
cl = core+lobe
a = "arc"
cN = core-N
cS = core-S
Note (3): Defined such that S^I^_{nu}_ {prop.to} {nu}^+{alpha}^,
where S^I^_{nu}_ is the integrated flux density at frequency {nu}.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Galaxy name
10- 14 F5.1 mJy Si6cm ? Integrated flux density at 6cm
16- 21 F6.1 mJy Si20cm ? Integrated flux density at 20cm
23- 24 I2 h RAh Right Ascension (J2000) (1)
26- 27 I2 min RAm Right Ascension (J2000) (1)
29- 32 F4.1 s RAs Right Ascension (J2000) (1)
34 A1 --- DE- Sign of the Declination (J2000) (1)
35- 36 I2 deg DEd Declination (J2000) (1)
38- 39 I2 arcmin DEm Declination (J2000) (1)
41- 42 I2 arcsec DEs Declination (J2000) (1)
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Note (1): Objects are identified as [HU2001] JHHMMSS.s+DDMMSS in Simbad
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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 Galaxy name
10 A1 --- l_C6cm Limit flag on C6cm
11- 15 F5.2 [W/Hz] C6cm Log of the peak core power at 6cm
17 A1 --- l_T6cm Limit flag on T6cm
18- 22 F5.2 [W/Hz] T6cm Log of the integrated total power at 6cm
24 A1 --- l_C20cm Limit flag on C20cm
25- 29 F5.2 [W/Hz] C20cm Log of the peak core power at 20cm
31 A1 --- l_T20cm Limit flag on T20cm
32- 36 F5.2 [W/Hz] T20cm Log of the integrated total power at 20cm
38 A1 --- l_Theta Limit flag on Theta
39- 43 F5.2 arcsec Theta ? Largest angular size
45 A1 --- l_Size Limit flag on Size
46- 50 I5 pc Size ? Largest linear size
52- 54 I3 deg PArad ? Position angle of radio major axis
56- 58 A3 --- Morph Radio morphology class (1)
60 A1 --- f_Morph Flag on Morph (2)
62- 67 F6.2 mag BMag Absolute B band magnitude
69- 71 I3 deg PAopt ? Position angle of optical major axis
73 A1 --- l_[OIII] Limit flag on [OIII]
74- 78 F5.2 [10-7W] [OIII] Log luminosity of [OIII] 5007{AA} emission
line (in ergs/s)
80- 84 F5.2 [10-7W] Ha Log luminosity of H{alpha} emission
line (in ergs/s)
86 A1 --- l_FWHM Limit flag on FWHM
87- 89 I3 km/s FWHM ? The FWHM of [NII] 6583{AA} emission line
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Note (1): Definitions of Ulvestad & Wilson (1984ApJ...278..544U)
U = single, unresolved,
S = single, slightly resolved
D = diffuse,
L = linear structure or multiply aligned components, and
A = ambiguous.
Note (2): Extended emission not included in the morphological classification
because it is thought to be associated with the host galaxy rather
than the AGN.
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History:
From electronic version of the journal
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(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 24-Apr-2001