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J/AJ/122/518 Large Bright Quasar Survey (LBQS) VII (Hewett+, 2001)
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The Large Bright Quasar Survey. VII. The LBQS and FIRST surveys.
Hewett P.C., Foltz C.B., Chaffee F.H.
<Astron. J. 122, 518 (2001)>
=2001AJ....122..518H
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ADC_Keywords: QSOs ; Surveys
Keywords: quasars: general - surveys
Abstract:
The source catalog for the Large Bright Quasar Survey (LBQS) and the
FIRST Survey are compared in their regions of overlap to assess the
efficiency of the LBQS selection algorithms. In the 270 deg^2^ common
to both surveys, the LBQS contains ~100,000 stellar and ~40,000
nonstellar objects, while the FIRST catalog contains ~25,000 sources.
Cross-correlation of these lists yields 67 positional coincidences
between known LBQS quasars and FIRST sources and an additional 19
stellar and 149 nonstellar positional coincidences with the radio
catalog. Spectroscopy of all the stellar matches and two-thirds of the
nonstellar matches using the Keck I Telescope and the 6.5 m MMT
produces eight new quasars. One BL Lac object, previously
misclassified during the LBQS survey is also identified. The
straightforward fractional incompleteness of the LBQS determined from
this sample is 13%+/-4%, in good agreement with the published estimate
of 10%.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 12 New LBQS quasars
table2.dat 94 75 LBQS/FIRST Quasars
table3.dat 89 21 LBQS-FIRST stellar matches
table4.dat 79 153 LBQS-FIRST non-stellar matches
table5.dat 102 9 Additional LBQS-FIRST quasars
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See also:
J/AJ/109/1498 : Large Bright Quasar Survey VI (LBQS) (Hewett+, 1995)
VII/182 : Catalogue of high-redshift QSOs, z>=2.2, in SGP & F401 (Warren+ 1991)
VIII/59 : The FIRST Survey, version 1999Jul (White+ 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- LBQS LBQS name
13- 14 I2 h RA1h Right ascension (B1950)
16- 17 I2 min RA1m Right ascension (B1950)
19- 23 F5.2 s RA1s Right ascension (B1950)
25 A1 --- DE1- Declination sign (B1950)
26- 27 I2 deg DE1d Declination (B1950)
29- 30 I2 arcmin DE1m Declination (B1950)
32- 35 F4.1 arcsec DE1s Declination (B1950)
38- 39 I2 h RAh Right ascension (J2000)
41- 42 I2 min RAm Right ascension (J2000)
44- 48 F5.2 s RAs Right ascension (J2000)
50 A1 --- DE- Declination sign (J2000)
51- 52 I2 deg DEd Declination (J2000)
54- 55 I2 arcmin DEm Declination (J2000)
57- 60 F4.1 arcsec DEs Declination (J2000)
62- 66 F5.3 --- z Redshift
68- 72 F5.2 mag Bjmag B_J_ magnitude
74- 77 A4 --- Field Field
79 A1 --- Notes [a-f] Individual notes (1)
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Note (1): Individual notes:
a: Obvious candidate. Observed in 1991 November but not included in
Paper VI (Hewett et al., 1995, Cat. <J/AJ/109/1498>) because of a
bookkeeping error.
See also Cristiani et al. 1995, Cat. <J/A+AS/112/347>
b: Obvious candidate. Not observed because of erroneous information,
via private communication, that the object was a star.
Redshift from Cristiani et al. 1995, Cat. <J/A+AS/112/347>
c: Candidate. Redshift from Warren et al., 1991, Cat. <VII/182>
d: Candidate. See also Boyle et al. 1990.
e: Obvious candidate. Not in Paper VI (Hewett et al., 1995,
Cat. <J/AJ/109/1498>) sample because of a bookkeeping error
(in Goldschmidt, 1993, Ph.D. thesis, Univ. Edinburgh).
f: Obvious candidate. Redshift from Hawkins & Veron,
1995, Cat. <J/MNRAS/275/1102>.
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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- 11 A11 --- LBQS The LBQS name (1)
13- 14 I2 h RAh Right Ascension (J2000)
16- 17 I2 min RAm Right Ascension (J2000)
19- 23 F5.2 s RAs Right Ascension (J2000)
25 A1 --- DE- Sign of the Declination (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 35 F4.1 arcsec DEs Declination (J2000)
37- 41 F5.3 --- z ? Redshift
43 A1 --- f_z [?] Indicates an unknown redshift
45- 49 F5.2 mag Bjmag The B_J_ band magnitude
51- 66 A16 --- FIRST The FIRST source name and position
68- 74 F7.2 mJy Flux FIRST integrated radio flux at 1.4GHz
76- 80 F5.3 mJy e_Flux The rms uncertainty in Flux
82- 84 F3.1 arcsec Sep Angular separation between LBQS and FIRST
sources
86- 90 F5.2 [-] LogR ? Log of the k-corrected radio to optical flux
ratio
92- 93 A2 --- Notes Other notes (2)
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Note (1): Derived from the B1950.0 coordinates.
Note (2): Notes:
N = Optical-radio separation > 2.1 arcsec. Object not included in
LBQS-FIRST statistical sample.
ns = Classified as a non-stellar source on the UKST direct plate
a = BL Lac candidate without confirmed redshift. Redshift z = 0.75
adopted in calculation of LogR.
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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- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 23 F4.1 arcsec DEs Declination (J2000)
25- 29 F5.2 mag Bjmag B_J_ magnitude
31- 46 A16 --- FIRST FIRST source designation
48- 53 F6.2 mJy Flux FIRST integrated radio flux at 1.4GHz
55- 59 F5.3 mJy e_Flux rms uncertainty on Flux
61- 63 F3.1 arcsec Sep Angular separation between LBQS and FIRST
sources
65- 69 A5 --- QSO LBQS classification
71- 76 A6 --- SpClass Spectroscopic classification
78- 82 F5.3 --- z ? Redshift
84- 89 A6 --- Obs Origin of the spectroscopy
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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- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 23 F4.1 arcsec DEs Declination (J2000)
25- 28 F4.1 mag Bjmag B_J_ magnitude
29 A1 --- u_Bjmag [)] Uncertainty flag on Bjmag
31- 46 A16 --- FIRST FIRST source designation
48- 53 F6.2 mJy Flux FIRST integrated radio flux at 1.4GHz
55- 59 F5.3 mJy e_Flux rms uncertainty on Flux
61- 63 F3.1 arcsec Sep Angular separation between LBQS and FIRST
sources
65- 69 F5.3 --- z ? Redshift
70 A1 --- n_z [S] S: star
72- 77 A6 --- Obs Origin of the spectroscopic classification
79 A1 --- Notes [a-d] Individual notes (1)
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Note (1): Individual notes:
a: From Clements et al., 1996, Cat. <J/MNRAS/279/459>
b: From Wills & Wills, 1974ApJ...190..271W
c: From Suntzeff et al., 1996IAUC.6490....1S
d: From Shectman et al., 1996, Cat. <VII/203>
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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- 11 A11 --- JName Name derived from the J2000 coordinates
13- 14 I2 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 23 F5.2 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 35 F4.1 arcsec DEs Declination (J2000)
37- 41 F5.3 --- z ? Redshift
42 A1 --- f_z [?] ? when redshift unknown
44- 48 F5.2 mag Bjmag B_J_ magnitude
49 A1 --- n_Bjmag [a] a: Magnitude estimated using peak intensity
from APM scan of UKST plate
51- 66 A16 --- FIRST First source designation
68- 73 F6.2 mJy Flux FIRST integrated radio flux at 1.4GHz
75- 79 F5.3 mJy e_Flux rms uncertainty on Flux
81- 83 F3.1 arcsec Sep Angular separation between LBQS and FIRST sources
85- 88 F4.2 --- logR* k-corrected ratio of radio-to-optical flux for
each optical-radio association
89 A1 --- n_logR* [b] b: Individual note (1)
91- 95 A5 --- QSO LBQS classification
97-102 A6 --- SpClas Spectroscopic classification
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Note (1): b: BL Lac candidate without confirmed redshift. A redshift of
z=0.75 was adopted in calculation of log R*.
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History:
From electronic version of the journal
References:
Foltz et al., Paper I 1987AJ.....94.1423F
Foltz et al., Paper II 1989AJ.....98.1959F
Hewett et al., Paper III 1991AJ....101.1121H
Chaffee et al., Paper IV 1991AJ....102..461C
Morris et al., Paper V 1991AJ....102.1627M
Hewett et al., Paper VI 1995AJ....109.1498H, Cat. <J/AJ/109/1498>
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(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 12-Nov-2001