J/MNRAS/382/1552 Multiwavelength study of nearby galaxy nuclei (Lira+, 2007)
Multiwavelength study of the nuclei of a volume-limited sample of galaxies.
II. Optical, infrared and radio observations.
Lira P., Johnson R.A., Lawrence A., Cid Fernandes R.
<Mon. Not. R. Astron. Soc., 382, 1552-1590 (2007)>
=2007MNRAS.382.1552L 2007MNRAS.382.1552L
ADC_Keywords: Galaxies, nearby ; Radio sources
Keywords: galaxies: active - galaxies: general - galaxies: nuclei
Abstract:
We present optical and infrared broad-band images, radio maps, and
optical spectroscopy for the nuclear region of a sample of nearby
galaxies. The galaxies have been drawn from a complete volume-limited
sample for which we have already presented X-ray imaging. We modelled
the stellar component of the spectroscopic observations to determine
the star formation history of our targets. Diagnostic diagrams were
used to classify the emission-line spectra and determine the ionizing
mechanism driving the nuclear regions. All those sources classified as
active galactic nuclei present small Eddington ratios (∼10-3-10-6),
implying a very slow growth rate of their black holes. We finally
investigate the relative numbers of active and normal nuclei as a
function of host galaxy luminosity and find that the fraction of
active galaxies slowly rises as a function of host absolute magnitude
in the MB~-12 to -22 range.
Description:
Broad-band optical images of the galaxies were obtained at the 1-m
Jacobus Kapteyn Telescope in La Palma in 1994 February and August. The
UBVRI images had a pixel scale of ∼0.3arcsec and the total field of
view (FOV) was of ∼6arcmin. Near-infrared (NIR) images were taken at
the 2.1-m telescope of the Observatorio Astronomico Nacional in Baja
California in 1994 October and 1995 March and October. JHK images were
obtained with a pixel scale of ∼0.5arcsec and an FOV of ∼2arcmin.
Radio observations at 1.4GHz were taken with the Very Large Array
(VLA) in B configuration in 1994 August.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 37 The volume-limited sample of galaxies
table2.dat 52 79 Nuclear radio sources
table5.dat 61 67 Coordinates and classification for the sources
refs.dat 80 40 References
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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- 9 A9 --- Galaxy Galaxy name
11- 12 I2 h RAh Right ascension (J2000)
14- 15 I2 min RAm Right ascension (J2000)
17- 18 I2 s RAs Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 28 I2 arcsec DEs Declination (J2000)
30- 34 F5.1 mag BMAG Absolute B magnitude
36- 43 A8 --- HType Hubble type
44- 48 F5.2 Mpc Dist Revised distance
49 A1 --- n_Dist [ab] Note on Dist (1)
51- 54 A4 --- Ref References, in refs.dat file
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Note (1): Notes as follows:
a = M 32 is assumed to be at the same distance as M 31
b = Distance very uncertain, in the range 7-13Mpc
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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- 9 A9 --- Galaxy Galaxy name
11- 12 A2 --- l_Flux [<> ] Limit flag on Flux (2)
13- 19 F7.3 mJy Flux Flux at W wavelength
21 I1 mJy e_Flux ? rms uncertainty on Flux
24- 27 F4.1 cm W Wavelength corresponding to flux
28 A1 --- n_W [abcde] Note on W1 (3)
30- 34 A5 --- Ref Reference, in refs.dat file
37- 52 A16 --- Atlas Atlas information (4)
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Note (2): Upper limits correspond to 5σ values, except for NGC 185
(10σ)
Note (3): Notes as follows:
a = Total flux; unclear if source is compact or extended
b = Extended source, peak flux
c = Extended source; no dominant peak; total flux
d = Mean value - strongly variable
e = Estimate of peak flux at an optical nucleus
Note (4): For sources that had spectroscopic follow-up, the name of the
spectrum shown in Fig. 2, and whether the radio sources are coincident
with the galaxy nucleus (N).
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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- 9 A9 --- Galaxy Galaxy name
11- 20 A10 --- [LJL2007] Object name
23- 24 I2 h RAh ? Right ascension (J2000)
26- 27 I2 min RAm ? Right ascension (J2000)
29- 33 F5.2 s RAs ? Right ascension (J2000)
35 A1 --- DE- Declination sign (J2000)
36- 37 I2 deg DEd ? Declination (J2000)
39- 40 I2 arcmin DEm ? Declination (J2000)
42- 45 F4.1 arcsec DEs ? Declination (J2000)
46 A1 --- n_DEs [a] a: NED Coordinates
48- 60 A13 --- Class Classification (1)
61 A1 --- n_Class [b] b: Classification adopted from the
literature (see Appendix A)
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Note (1): The source classification corresponds to foreground star (FS),
stellar (A) (i.e. with total absence of emission lines), star forming
(SF), LINER (L) and Seyfert (Sy). An A-SF classification corresponds
to a stellar spectrum with very faint superimposed emission lines. For
details on the spectral classification, see Section 6.2. When the
source corresponds to the galaxy nucleus, this is noted in this column.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Ref Reference code
7- 25 A19 --- BibCode BibCode
27- 56 A30 --- Aut Author's name
60- 80 A21 --- Com Comments
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History:
From electronic version of the journal
References:
Lira et al., Paper I 2000MNRAS.319...17L 2000MNRAS.319...17L
(End) Patricia Vannier [CDS] 10-Jun-2008