J/A+A/399/469 Parkes Quarter-Jansky Flat-Spectrum Sample. II. (Hook+, 2003)
The Parkes Quarter-Jansky Flat-Spectrum Sample.
2. New optical spectra and redshift measurements.
Hook I.M., Shaver P.A., Jackson C.A., Wall J.V., Kellermann K.I.
<Astron. Astrophys. 399, 469 (2003)>
=2003A&A...399..469H 2003A&A...399..469H
ADC_Keywords: QSOs ; Redshifts
Keywords: quasars: general
Abstract:
We present optical spectra and redshift measurements for 178
flat-spectrum objects from the Parkes quarter-Jansky flat-spectrum
sample. These spectra were obtained in order to compile a complete
sample of quasars for use in a study of quasar evolution. We present a
composite optical spectrum made from the subset of 109 quasars that
have flux densities in the range 0.25Jy<S(2.7GHz)<0.5Jy, and make a
comparison with a composite spectrum for radio-quiet QSOs from the
Large Bright Quasar Survey. Our large sample of radio-loud quasars
allows us to strengthen previous reports that the Ly and CIV emission
lines have larger equivalent width in radio-loud quasars than
radio-quiet QSOs to greater than the 3σ level. However we see no
significant difference in the equivalent widths of CIII] or MgII. We
also show that the flux decrements across the Lyman-α line (DA)
measured from these spectra show the same trend with redshift as for
optically selected QSOs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 31 178 Redshifts for the Parkes quarter-Jansky
flat-spectrum sample
notes.dat 80 28 Individual notes
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See also:
VIII/34 : Parkes Half-Jansky Flat-Spectrum Sample (Drinkwater + 1997)
J/A+A/386/97 : Parkes Quarter-Jansky Flat-Spectrum Sample. I. (Jackson+, 2002)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name QSO name (BHHMM-DDd)
10 A1 --- n_Name [*] for a note detailed in notes.dat file
12- 16 F5.3 --- z ? Redshift
18 I1 --- Conf [0/2] Level of confidence of the redshift (1)
20- 22 A3 --- Class Classification, reproduced from Jackson et al.
(2002, Cat. J/A+A/386/97) (2)
24- 30 A7 "MM/YYYY" Date Observation date
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Note (1): Level of confidence in the redshift
0 = no lines for redshift determination
1 = secure redshift
2 = single line or weak lines
Note (2): These classifications are based on both the spectrum and images
of the source and their meanings are as follows:
Q = confirmed quasar by spectroscopy or UVX photometry
BL = spectroscopically-confirmed BL Lac object
G = Galaxy with morphological or spectroscopic confirmation
NCS = Non-compact radio source (the source is either a steep-spectrum
or extended radio source)
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name
11- 80 A70 --- Note Text of the note
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History:
From electronic version of the journal
(End) Patricia Bauer [CDS] 11-Feb-2003