J/MNRAS/251/482 A spectroscopic survey of faint QSOs (Boyle+ 1991)
A spectroscopic survey of faint QSOs
Boyle B.J., Jones L.R., Shanks T.
<Mon. Not. R. Astron. Soc. 251, 482 (1991)>
=1991MNRAS.251..482B 1991MNRAS.251..482B
ADC_Keywords: QSOs; Spectroscopy; Equivalent widths; Positional data; Magnitudes
Summary:
Positions, magnitudes and identifications are presented for a complete
sample of 236 faint (B≲22 mag) stellar objects based on spectroscopic
observations of multicolour selected samples from deep photographic
plates. Similar information is also provided for a further 98 objects
not included in the complete sample. The survey covers an effective
area of 0.85 square degrees and contains 66 newly identified QSOs. In
total, 93 per cent of the complete sample has been identified and
unambiguous redshifts have been obtained for 85 per cent of the QSOs.
The integral surface density of low-redshift (z<2.2) QSOs at B<22 mag
is estimated to be 67.6±8.8 per square degrees, confirming the
strong flattening previously observed in the QSO number-magnitude
relation at B≳19.5 mag. At the same magnitude limit, the integral
surface density of QSOs in the range 2.2<z<2.9 is found to be
9.2±3.7 per square degrees. Broad absorption line systems are
observed in 5-10 per cent of the QSOs in which such systems should be
detectable, a similar percentage to those derived from brighter
samples of QSOs. Emission line equivalent widths measured in this
survey are similar to those derived from optically brighter QSO
samples. The remainder of the survey is principally composed of
galactic subdwarf stars and compact narrow emission line galaxies,
although six DA white dwarfs and height distant (> 35 kpc) blue
horizontal branch stars are also identified.
See also : J/MNRAS/243/1
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6 96 66 The QSO catalogue
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Byte-by-byte Description of file: table6
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Bytes Format Units Label Explanations
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1- 24 A24 --- FC Field Centre
25 A1 --- note [*!]
*: Not included in the complete sample
!: Observed with both FORS and IPCS on the AAT
26- 33 A8 --- Name QSO designation in this survey
35- 36 I2 h RAh Right ascension 1950
38- 39 I2 min RAm Right ascension 1950
41- 44 F4.1 s RAs Right ascension 1950
46 A1 --- DE- Declination sign
47- 48 I2 deg DEd Declination 1950
50- 51 I2 arcmin DEm Declination 1950
53- 54 I2 arcsec DEs Declination 1950
56- 60 F5.2 mag bj bj magnitude (bj = B-0.23(B-V))
62- 66 F5.2 mag U-bj U-bj colour
68- 71 F4.2 mag bj-rf bj-rf colour (rj = R- 0.06(B-R))
73- 77 F5.3 --- z redshift
80 A1 --- q_z [123] Estimate of the redshift quality (1)
83- 85 I3 --- Lyalpha []? Rest equivalent width of the emission
lines of Lyalpha + N V
87- 89 I3 --- CIV []? Rest equivalent width of the emission
lines of CIV
91- 93 I3 --- CIII] []? Rest equivalent width of the emission
lines of CIII]
95- 96 I2 --- MgII []? Rest equivalent width of the emission
lines of Mg II
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Note(1) Redshift quality:
1: good redshift
2: probable redshift
3: uncertain redshift
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Courtesy: Brian Boyle
(End) Patricia Bauer [CDS] 30-Jun-1994