J/AJ/121/31 High-redshift quasars in SDSS (Fan+, 2001)
High-redshift quasars found in Sloan Digital Sky Survey commissioning data.
III. A color-selected sample at i*<20 in the fall equatorial stripe.
Fan X., Strauss M.A., Richards G.T., Newman J.A., Becker R.H.,
Schneider D.P., Gunn J.E., Davis M., White R.L., Lupton R.H.,
Anderson J.E.JR, Annis J., Bahcall N.A., Brunner R.J., Csabai I., Doi M.,
Fukugita M., Hennessy G.S., Hindsley R.B., Ivezic Z., Knapp G.R.,
Mckay T.A., Munn J.A., Pier J.R., Szalay A.S., York D.G.
<Astron. J., 121, 31-53 (2001)>
=2001AJ....121...31F 2001AJ....121...31F
ADC_Keywords: QSOs ; Surveys
Keywords: Galaxies: Quasars: General, Surveys
Abstract:
This is the third paper in a series aimed at finding high-redshift
quasars from five-color (u'g'r'i'z') imaging data taken along the
celestial equator by the Sloan Digital Sky Survey (SDSS) during its
commissioning phase. In this paper, we first present the observations
of 14 bright, high-redshift quasars (3.66≤z≤4.77, i*≲20) discovered
in the SDSS fall equatorial stripe, and the SDSS photometry of two
previously known high-redshift quasars in the same region of the sky.
Combined with the quasars presented in Paper I (1999AJ....118....1F 1999AJ....118....1F)
and by Schneider et al. (2001AJ....121.1232S 2001AJ....121.1232S), we define a
color-selected flux-limited sample of 39 quasars at 3.6<z<5.0 and
i*≲20, covering a total effective area of 182deg2. From this
sample, we estimate the average spectral power-law slope in the
rest-frame UV for quasars at z∼4 to be -0.79 with a standard deviation
of 0.34, and the average rest-frame equivalent width of the
Lyα+N V emission line to be 69Å with a standard deviation of
18Å.
Based on observations obtained with the Sloan Digital Sky Survey, with
the Apache Point Observatory 3.5m telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 96 16 Positions and Photometry of Bright SDSS
High-Redshift Quasars
table3.dat 70 16 Continuum Properties of Bright SDSS
High-Redshift Quasars
table4.dat 69 39 Color-selected Sample of 182 deg2 in
the Fall Equatorial Stripe
table7.dat 94 35 Positions and Photometry of Faint SDSS
High-Redshift Quasars
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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- 5 A5 --- --- [SDSSp]
7- 25 A19 --- SDSS SDSS object name (G1)
27 A1 --- n_SDSS Note about previous reports (2)
29- 32 F4.2 --- z Redshift
34- 37 F4.2 --- e_z Uncertainty in z
39- 43 F5.2 mag umag The SDSS u'-band asinh magnitude (G3)
45- 48 F4.2 mag e_umag The uncertainty in umag
50- 54 F5.2 mag gmag The SDSS g'-band asinh magnitude (G3)
56- 59 F4.2 mag e_gmag The uncertainty in gmag
61- 65 F5.2 mag rmag The SDSS r'-band asinh magnitude (G3)
67- 70 F4.2 mag e_rmag The uncertainty in rmag
72- 76 F5.2 mag imag The SDSS i'-band asinh magnitude (G3)
78- 81 F4.2 mag e_imag The uncertainty in imag
83- 87 F5.2 mag zmag The SDSS z'-band asinh magnitude (G3)
89- 92 F4.2 mag e_zmag The uncertainty in zmag
94- 96 I3 --- Run Observational run number
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Note (2):
a = This is the previously known quasar PSS 0059+0003
(Kennefick et al. 1995);
b = This quasar was first reported at
http://astro.caltech.edu/~george/z4.qsos as PSS 0244-0108.
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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- 5 A5 --- --- [SDSSp]
7- 25 A19 --- SDSS SDSS object name (G1)
27- 30 F4.2 --- z Redshift
32- 35 F4.2 --- e_z Uncertainty in z
37- 41 F5.3 mag E(B-V) The E(B-V)
43- 47 F5.2 mag ABmag The continuum magnitude at 1450 Å in the
rest frame corrected for Galactic extinction
49- 52 F4.2 mag e_ABmag The uncertainty in ABmag
54- 59 F6.2 mag ABMag The absolute magnitude at 1450 Å (G2)
61- 65 F5.2 --- Sp-Index Continuum power0law index where
fν ∝ νSp-Index
67- 70 F4.2 --- e_Sp-Index The uncertainty in Sp-Index
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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- 4 A4 --- --- [SDSS]
6- 24 A19 --- SDSS SDSS object name (G1)
26- 29 F4.2 --- z Redshift
31- 35 F5.2 mag ABmag The continuum magnitude at 1450 Å in the
rest frame corrected for Galactic extinction
37- 40 F4.2 mag e_ABmag The uncertainty in ABmag
42- 47 F6.2 mag ABMag The absolute magnitude at 1450 Å (G2)
49- 53 F5.2 --- Sp-Index Continuum power-law index, where
fν ∝ νSp-Index
55- 58 F4.2 --- e_Sp-Index The uncertainty in Sp-Index
60- 64 F5.1 0.1nm EqWid The Lyα+NV (1240Å) equivalent width
66- 69 F4.2 --- Prob Detection probability (3)
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Note (3): The probability that a quasar of a given ABMag, z, and spectral
energy distribution will satisfy the color selection criteria (eqs.
[1] and [2]).
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [SDSSp]
7- 25 A19 --- SDSS SDSS object name (G1)
27- 30 F4.2 --- z Redshift
32- 35 F4.2 --- e_z Uncertainty in z
37- 41 F5.2 mag umag The SDSS u'-band asinh magnitude (G3)
43- 46 F4.2 mag e_umag The uncertainty in umag
48- 52 F5.2 mag gmag The SDSS g'-band asinh magnitude (G3)
54- 57 F4.2 mag e_gmag The uncertainty in gmag
59- 63 F5.2 mag rmag The SDSS r'-band asinh magnitude (G3)
65- 68 F4.2 mag e_rmag The uncertainty in rmag
70- 74 F5.2 mag imag The SDSS i'-band asinh magnitude (G3)
76- 79 F4.2 mag e_imag The uncertainty in imag
81- 85 F5.2 mag zmag The SDSS z'-band asinh magnitude (G3)
87- 90 F4.2 mag e_zmag The uncertainty in zmag
92- 94 I3 --- Run Observational run number
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Global Notes:
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Note (G1): Positional information in Name is in J2000.0 coordinates.
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Note (G2): Magnitude calculated in the rest frame and for the
H0=50 km/s/Mpc, Ω=1 model.
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Note (G3): The asinh magnitudes (Lupton, Gunn, & Szalay 1999) are quoted;
errors are statistical only. For reference, zero flux corresponds to
asinh magnitudes of 23.40, 24.22, 23.98, 23.51, and 21.83 in u*,
g*, r*, i*, and z*, respectively.
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History:
From electronic version of the journal
References:
1999AJ....118....1F 1999AJ....118....1F : Paper I
2000AJ....119....1F 2000AJ....119....1F : Paper II
2001AJ....121...54F 2001AJ....121...54F : Paper IV
(End) Greg Schwarz [AAS], Laurent Cambresy [CDS] 13-Jul-2004