J/ApJ/599/116 UV properties of absorbed quasars (Vestergaard+, 2003)
Occurrence and global properties of narrow C IV λ1549Å
absorption lines in moderate-redshift quasars.
Vestergaard M.
<Astrophys. J., 599, 116-139 (2003)>
=2003ApJ...599..116V 2003ApJ...599..116V
ADC_Keywords: QSOs ; Ultraviolet ; Equivalent widths ; Redshifts
Keywords: galaxies: active - quasars: absorption lines -
quasars: emission lines - ultraviolet: galaxies
Abstract:
A statistical study is presented of (1) the frequency of narrow C IV
λ1549 absorption lines in 1.5≤z≲3.6 radio-quiet and
radio-loud quasars and (2) the UV and radio properties of the absorbed
quasars. The quasar sample is unbiased with respect to absorption
properties, and the radio-quiet and radio-loud subsamples are well
matched in redshift and luminosity.
Description:
The quasar sample under study comprises 66 RLQs and 48 RQQs located at
redshifts between 1.5 and 3.5; it has already been studied by
Vestergaard (2000PASP..112.1504V 2000PASP..112.1504V, 2004ApJ...601..676V 2004ApJ...601..676V), Vestergaard,
Wilkes, & Barthel (2000ApJ...538L.103V 2000ApJ...538L.103V), and Paper I (Vestergaard,
2002, ASP Conf. Ser. 255, 143).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 88 86 Properties of Absorbed Quasars and Their Absorbers
table2.dat 54 53 Properties of Unabsorbed Quasars
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Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Quasar name (QHHMM+DDd)
11- 13 A3 --- RType Radio type
15- 19 F5.3 --- z Quasar redshift
21- 26 F6.2 mag VMAG Absolute V magnitude (1)
28- 33 F6.3 [10-7W] logL1550 Monochromatic continuum luminosity at 1550Å
35- 39 F5.2 --- Sp+Index UV spectral slope, α_λ
41- 44 F4.2 --- E_Sp+Index Error on Sp+Index (Upper limit)
46- 49 F4.2 --- e_Sp+Index Error on Sp+Index (Lower limit)
51- 56 F6.1 0.1nm lambdaObs ? Wavelength position of the narrow absorber
in the observed frame of reference (2)
58- 63 F6.4 --- zabs ? Redshift of the absorber (2)
65- 70 I6 km/s Vel ? Absorber velocity (2) (3)
72- 78 F7.4 --- beta ? Velocity/c (2) (3)
80- 83 F4.2 0.1nm EWabs ? Rest-frame equivalent width of the
narrow absorber (2)
85- 88 F4.2 0.1nm e_EWabs ? rms uncertainty on EWabs (2) (4)
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Note (1): α=-0.7 was adopted for the K-correction,
Fλ∝λαλ
Note (2): In table1.dat only.
Note (3): The absorber velocity is defined as Vel=-β*c ; that is,
negative velocities denote blueshifted absorbers relative to the
emission-line redshift. Since UV broad emission lines can be
blueshifted relative to the systemic redshift, redshifted absorption
need not indicate infall toward the central engine.
β=(r2-1)/(r2+1), where r=(1+zem)/(1+zabs), and c is the speed
of light.
Note (4): The 1σ EWabs uncertainty was measured from the continuum rms
across a resolution element at the position of the absorber
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 05-Feb-2004