J/ApJS/171/1 Census of QSOs Narrow Absorption Lines (Misawa+, 2007)
A census of intrinsic narrow absorption lines in the spectra of quasars
at z=2-4.
Misawa T., Charlton J.C., Eracleous M., Ganguly R., Tytler D., Kirkman D.,
Suzuki N., Lubin D.
<Astrophys. J. Suppl. Ser., 171, 1-28 (2007)>
=2007ApJS..171....1M 2007ApJS..171....1M
ADC_Keywords: Active gal. nuclei ; QSOs ; Spectroscopy
Keywords: accretion: accretion disks - galaxies: active -
quasars: absorption lines - quasars: general
Abstract:
We use Keck HIRES spectra of 37 optically bright quasars at z=2-4
to study narrow absorption lines that are intrinsic to the quasars
(intrinsic NALs, produced in gas that is physically associated with
the quasar central engine). We identify 150 NAL systems, which contain
124 CIV, 12 NV, and 50 SiIV doublets, of which 18 are associated
systems (within 5000km/s of the quasar redshift). We use partial
coverage analysis to separate intrinsic NALs from NALs produced in
cosmologically intervening structures. We find 39 candidate intrinsic
systems (28 reliable determinations and 11 that are possibly
intrinsic). We estimate that 10%-17% of CIV systems at blueshifts
of 5000-70000km/s relative to quasars are intrinsic. At least
32% of quasars contain one or more intrinsic CIV NALs. Considering NV
and SiIV doublets showing partial coverage as well, at least 50% of
quasars host intrinsic NALs.
Description:
The quasars in our sample were originally selected and observed in a
survey aimed at measuring the deuterium-to-hydrogen abundance ratio
(D/H) in the Lyα forest. The observations were carried out with
Keck HIRES through a 1.14" slit resulting in a velocity resolution of
∼8km/s (FWHM). The spectra were extracted by the automated program,
MAKEE, written by Tom Barlow.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
qsos.dat 52 35 Quasar positions (from Simbad)
table5.dat 308 1068 Properties of Narrow Absorption Lines
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See also:
VII/23 : Absorption Lines in QSO Spectra (Ellis+ 1978)
III/211 : Keck/HIRES Sky Line Atlas (Osterbrock+ 1997)
J/PASP/106/646 : HST quasar absorption-line key project. VIII (Kirhakos+, 1994)
J/AJ/112/62 : Quasar absorption-line systems (Tanner+ 1996)
J/ApJ/472/509 : Lyman-alpha Forest in Q0000-26 (Lu+ 1996)
J/A+A/318/347 : Absorption lines in QSO 0000-2619 (Savaglio+, 1997)
J/A+A/412/707 : CoALS: Abs.-line systems in QSO spectra (Ryabinkov+, 2003)
J/AJ/125/1711 : Broad Absorption Line Quasars from SDSS (Reichard+, 2003)
Byte-by-byte Description of file: qsos.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- QSO QSO name based on B1950 coordinates
13- 17 F5.3 --- zem Redshift derived from emission lines
19- 20 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
22- 23 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
25- 28 F4.1 s RAs Simbad Second of Right Ascension (J2000.0)
30 A1 --- DE- Simbad Sign of the Declination (J2000.0)
31- 32 I2 deg DEd Simbad Degree of Declination (J2000.0)
34- 35 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
37- 38 I2 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
42- 46 F5.2 mag Bmag ? Simbad B band magnitude
48- 52 F5.2 mag Vmag ? Simbad V band magnitude
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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 --- QSO QSO name (based on B1950 coordinates)
13- 17 F5.3 --- zem Redshift derived from line emission
19- 21 A3 --- AAL "AAL" for Associated Absorption Line (1)
23- 26 A4 --- Ion Ion identification
28 A1 --- n_Ion [nl] Fitting profile used (2)
30- 35 F6.1 0.1nm Wave ? Wavelength of flux-weighted line center (3)
37 A1 --- f_Wave [jm] blend or approximate Wave value (4)
39- 44 F6.4 0.1nm EW ? Observed frame equivalent width of blue
member (3)
46 A1 --- f_EW [jm] blend or approximate equivalent width (4)
48- 53 F6.4 --- zabs Redshift derived from line absorption (5)
55 A1 --- f_zabs [jm] blend or approximate zabs (4)
57- 62 I6 km/s Vshift Velocity offset from quasar emission redshift
64 A1 --- f_Vshift [jm] blend or approximate Vshift (4)
66- 70 F5.2 [cm-2] logN ? Log of the column density (6)
72- 75 F4.2 [cm-2] e_logN ? The 1σ error in logN
77- 81 F5.1 km/s sigv ? Doppler parameter
83 A1 --- f_sigv [jm] blend or approximate sigv (4)
85- 88 F4.1 km/s e_sigv ? The 1σ error in sigv
90- 93 F4.2 --- Cf ? Coverage fraction (6)
95- 97 A3 --- f_Cf Flag on Cf indicating infinite upper
error limit
99-102 F4.2 --- E_Cf ? Upper 1σ error in Cf
104-107 F4.2 --- e_Cf ? Lower 1σ error in Cf
109-110 A2 --- Cl NAL class from coverage reliability (7)
112-116 A5 --- Sample Subsample types (8)
118-306 A189 --- Lines Other lines that are detected in
the system (9)
308 A1 --- n_Lines [k] indicates a presence of Lyα
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Note (1): Where |Vshift|≤5000km/s.
Note (2): Fitting profile as follows:
n = Fitting assuming coverage fraction (Cf)=1
l = Voigt profile fit is not applied because of smooth wide
absorption profile
Note (3): In units of Angstroms. Evaluated only for absorption lines.
Note (4): Note as follows:
j = Evaluated with red member, because blue member blends with other
lines, data defects, or echelle order gaps
m = Approximate value
Note (5): Of flux weighted line center.
Note (6): Fraction of background light occulted by the absorber,
evaluated only for kinematic components.
Note (7): Reliable (A), possible (B) and unclassified (C) NAL as follows:
A1 = Smooth and broad (self-blended) line profile (i.e., mini-BAL)
A2 = MINFIT gives Cf+3σ(Cf)<1 for at least one component
B1 = Both MINFIT and the pixel-by-pixel method give Cf+σ(Cf)<1
at the center of a component for at least one kinematic component
B2 = Line locked
C1 = MINFIT gives Cf+σ(Cf)≥1 for all components
C2 = No components can be used for classification because they suffer
from systematic errors
C3 = The system is not acceptable for classification because of
problems due to model fit, continuum fit, or critical data defect
Note (8): Subsample is as follows:
L = radio-loud
Q = radio-quiet
A = associated (within 5000km/s of zem)
H = homogeneous/complete sample with Wrest/sigv(Wrest≥5)
Note (9): Lines in parenthesis are in Lyα forest, i.e., less reliable.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-Apr-2009