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J/ApJS/134/35 Large Bright Quasar Survey emission lines (Forster+, 2001)
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Emission line properties of the large bright quasar survey.
Forster K., Green P.J., Aldcroft T.L., Vestergaard M., Foltz C.B.,
Hewett P.C.
<Astrophys. J. Suppl. Ser. 134, 35 (2001)>
=2001ApJS..134...35F (SIMBAD/NED BibCode)
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ADC_Keywords: QSOs ; Surveys ; Line Profiles ; Ultraviolet
Keywords: galaxies: active - quasars: emission lines - quasars: general -
ultraviolet: galaxies
Abstract:
We present measurements of the optical/UV emission lines for a large
homogeneous sample of 993 quasars from the Large Bright Quasar Survey.
Our largely automated technique accounts for continuum breaks and
galactic reddening, and we perform multicomponent fits to emission
line profiles, including the effects of blended iron emission, and of
absorption lines both galactic and intrinsic. Here we describe the
fitting algorithm and present the results of line fits to the LBQS
sample, including upper limits to line equivalent widths when
warranted. The distribution of measured line parameters, principally
W_{lambda}_ and FWHM, are detailed for a variety of lines, including
upper limits. We thus initiate a large-scale investigation of
correlations between the high-energy continuum and emission lines in
quasars, to be extended to complementary samples using similar
techniques. High-quality, reproducible measurements of emission lines
for uniformly selected samples will advance our understanding of
active galaxies, especially in a new era of large surveys selected by
a variety of complementary methods.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 30 65 LBQS quasars excluded from emission line
measurements
table5.dat 105 29760 Representative emission line measurements
table6.dat 104 992 Representative continuum measurements
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See also:
J/AJ/109/1498 : Large Bright Quasar Survey VI (LBQS) (Hewett+, 1995)
J/ApJ/450/51 : ROSAT observations of LBQS (Green+ 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- LBQS Designation in LBQS (Cat. <J/AJ/109/1498>)
12- 16 F5.3 --- z Redshift
18- 20 A3 --- Ref References (1)
23- 29 A7 --- Notes Notes (2)
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Note (1): References:
Original LBQS paper that identified
broad absorption line (upper case)
or associated narrow absorption (lower case)
I, i: Foltz et al., 1987AJ.....94.1423F
II, ii: Foltz et al., 1989AJ.....98.1959F
III, iii: Hewett et al., 1991AJ....101.1121H
IV, iv: Chaffee et al., 1991AJ....102..461C
V, v: Morris et al., 1991AJ....102.1627M
Note (2): Notes:
1: narrow absorption line (NAL) on Ly{alpha}
2: narrow absorption line (NAL) on C IV
3: broad absorption line (BAL) near Ly{alpha}
4: broad absorption line (BAL) near C IV
5: narrow absorption line (NAL) on Mg II
6: broad absorption line (BAL) near Mg II
7: narrow absorption line (NAL) on N V
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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- 10 A10 --- LBQS Designation in LBQS (Cat. <J/AJ/109/1498>)
12- 16 F5.3 --- z Redshift
18- 35 A18 --- Line Emission line name
36- 40 I5 km/s FWHM Full width at half maximum of Line
43- 47 I5 km/s E_FWHM Positive error on FWHM
50- 54 I5 km/s e_FWHM Negative error on FWHM
58- 61 I4 km/s Offset Gaussian emission line model peak offset from
the expected position (1)
64- 68 I5 km/s E_Offset Positive error on Offset
71- 75 I5 km/s e_Offset Negative error on Offset
79- 84 F6.2 0.1nm EW Rest frame equivalent width of line (in {AA})
88- 93 F6.2 0.1nm E_EW Positive error on EW (2)
97-102 F6.2 0.1nm e_EW Negative error on EW (2)
105 I1 --- Num Number of narrow absorption features used in
modeling the emission lines (3)
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Note (1): Note that no peak offset measurements appear for the iron emission
line measurements.
Note (2): Based in the 2{sigma} uncertainties in the amplitude and FWHM of the
Gaussian model and do not include an error from an uncertainty in the
underlying continuum flux level.
Note (3): Tabulated in the row of the closest emission line to the position of
the absorption feature.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- LBQS Designation in LBQS
(Cat. <J/AJ/109/1498>)
12- 16 F5.3 --- z Redshift
18- 22 F5.3 10+20/cm2 NHGal Galactic neutral hydrogen column density
25- 29 F5.2 --- Sp+Index Power law continuum slope
33- 36 F4.2 --- E_Sp+Index Positive error on Sp+Index
39- 42 F4.2 --- e_Sp+Index Negative error on Sp+Index
45- 48 I4 0.1nm Wave Normalized rest frame wavelength
52- 59 F8.5 10-13mW/m2/nm Flux Continuum flux at Wave
(in 10^-14^ergs/cm^2^/s/{AA})
63- 70 F8.5 10-13mW/m2/nm E_Flux Positive error on Flux
73- 80 F8.5 10-13mW/m2/nm e_Flux Negative error on Flux
83- 87 F5.2 --- Sp+Index2 Second power law continuum slope
90- 94 F5.2 --- E_Sp+Index2 Positive error on Sp+Index2
97-101 F5.2 --- e_Sp+Index2 Negative error on Sp+Index2
104 I1 --- Poly Polynomial order required to model
the blue region of the spectrum
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History:
From electronic version of the journal
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(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 19-Jun-2001