J/ApJS/150/181 Redshifts of 110 radio-loud AGNs (Eracleous+, 2004)
Accurate redshifts and classifications for 110 radio-loud active galactic nuclei
Eracleous M., Halpern J.P.
<Astrophys. J. Suppl. Ser., 150, 181 (2004)>
=2004ApJS..150..181E 2004ApJS..150..181E
ADC_Keywords: Active gal. nuclei ; Galaxies, radio ; Redshifts
Keywords: galaxies: active - galaxies: distances and redshifts -
galaxies: nuclei
Abstract:
We report accurate redshifts of 110 active galaxies (mostly radio-loud
objects at z<0.4) observed in the course of a survey to find broad,
double-peaked emission lines. These redshifts are measured from the
narrow emission lines of these objects and are accurate to at least
one part in 104. For each object we determine a redshift from high-
and low-ionization lines separately, as well as an average redshift
from all the available lines. We find that in about 15% of cases, the
low-ionization lines yield a slightly higher redshift than the
high-ionization lines; the average redshift difference amounts to
a velocity difference of approximately 80km/s. In addition to the
redshift measurements we also report revised redshifts for two objects
as well as new classifications for three narrow-line objects.
Description:
The spectra used for redshift determination were obtained during
several observing runs between 1988 and 2000 at the Kitt Peak National
Observatory's and Cerro Tololo Inter-American Observatory's 4m
telescopes, the Lick Observatory's 3m telescope, the MDM Observatory's
2.4m telescope, and the Kitt Peak National Observatory's 2.1m
telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 72 110 Measured Redshifts
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See also:
J/ApJ/599/886 : Emission lines of radio-loud AGN (Eracleous+, 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Galaxy name
18 A1 --- n_Name [bcde] Individual notes (1)
20- 26 F7.5 --- z Redshift derived from all available lines
28- 30 I3 10-5 e_z rms uncertainty on z
32- 38 F7.5 --- zLIL Redshfit derived from low-ionization lines only
40- 42 I3 10-5 e_zLIL rms uncertainty on e_zLIL
44- 51 F8.6 --- zHIL ? Redshift derived from high-ionization lines
only
53- 56 I4 10-6 e_zHIL ? rms uncertainty on e_zHIL
58- 59 I2 --- Nsp ? Number of spectra
61- 62 I2 --- LIL ? Number of low-ionization lines
64- 65 I2 --- HIL ? Number of high-ionization lines
67- 72 A6 --- Notes Remarks (2)
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Note (1): Individual notes as follows:
b = The redshift is based on the measured wavelength of the Mg II
doublet only, whose peak is often broad and asymmetric and also
affected by associated absorption lines. Therefore, the
uncertainty is larger than usual.
c = The only available low-ionization lines are the Balmer lines,
whose peaks are rather broad. This suggests that the narrow
Balmer lines are extremely weak, and hence the measured LIL
redshift refers to the broad lines.
d = The redshift of OX 169 was measured using all the spectra from
Halpern & Eracleous (2000ApJ...531..647H 2000ApJ...531..647H).
e = The lines used for the determining the redshift of PKS 2312-319
are C IV λ1549, N III] λ1750, C III] λ1909,
Mg II λ2798, and [O II] λ3727. The signal-to-noise
ratio is low, and therefore the uncertainty in the redshift is
larger than usual.
Note (2): Notes as follows:
NLRG = narrow-line object,
New z = revised redshift (from Paper I (Eracleous & Halpern,
1994ApJS...90....1E 1994ApJS...90....1E or Paper II, Halpern & Eracleous,
2003, Cat. J/ApJ/599/886).
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History:
* 26-Mar-2006: From electronic version of the journal
* 06-Jan-2009: Some positions corrected
References:
Eracleous & Halpern, Paper I 1994ApJS...90....1E 1994ApJS...90....1E
Eracleous & Halpern, Paper II 2003ApJ...599..886E 2003ApJ...599..886E, Cat. J/ApJ/599/886
(End) James Marcout, Patricia Vannier [CDS] 30-Jan-2004