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J/ApJ/641/78       CIV variability in 105 SDSS quasars          (Wilhite+, 2006)

Spectral variability of quasars in the Sloan Digital Sky Survey. II. The C IV line. Wilhite B.C., Vanden Berk D.E., Brunner R.J., Brinkmann J.V. <Astrophys. J., 641, 78-89 (2006)> =2006ApJ...641...78W
ADC_Keywords: Active gal. nuclei ; QSOs Keywords: galaxies: active - quasars: general - techniques: spectroscopic Abstract: We examine the variability of the high-ionization CIV λ1549 line in a sample of 105 quasars observed at multiple epochs by the Sloan Digital Sky Survey. We find a strong correlation between the change in the CIV line flux and the change in the line width, but no correlations between the change in flux and changes in line center and skewness. The relation between line flux change and line width change is consistent with a model in which a broad line base varies with greater amplitude than the line core. The objects studied here are more luminous and at higher redshift than those normally studied for variability, ranging in redshift from 1.65 to 4.00 and in absolute r-band magnitude from roughly -24 to -28. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 66 105 CIV variability sample table2.dat 27 105 CIV flux variability table3.dat 43 105 CIV profile variability
See also: J/ApJ/633/638 : 315 SDSS variable quasar sample (Wilhite+, 2005) J/A+A/321/123 : Optical variability of QSOs (Cristiani+ 1997) J/A+AS/143/465 : Quasar variability (Hawkins+, 2000) J/AJ/131/1923 : Known quasars in the QUEST Variability Survey (Rengstorf+, 2006) J/MNRAS/268/305 : Variability of optically selected quasars (Hook+ 1994) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Source running number 5- 22 A18 --- SDSS SDSS name (HHMMSS.ss+DDMMSS.s) (1) 24- 28 I5 d MJDH Modified Julian date of the high-S/N epoch 30- 34 I5 d MJDL Modified Julian date of the low-S/N epoch 36- 39 F4.2 --- z High-S/N epoch redshift 41- 45 F5.1 d Dtau Rest-frame time lag 47- 50 F4.1 mag Rmag High-S/N apparent R band magnitude 52- 56 F5.1 mag RMAG High-S/N absolute R band magnitude 58- 61 F4.1 --- S/NH The S/N of the high-S/N epoch 63- 66 F4.1 --- S/NL The S/N of the low-S/N epoch
Note (1): SDSS JHHMMSS.ss+DDMMSS.s in Simbad.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Source running number 5- 8 F4.1 10-19W/m2/nm FcontH High-S/N continuum flux (1) 10- 13 F4.1 10-19W/m2/nm FcontL Low-S/N continuum flux (1) 15- 20 F6.1 10-19W/m2/nm FlineH High-S/N line flux (1) 22- 27 F6.1 10-19W/m2/nm FlineL Low-S/N line flux (1)
Note (1): In units of 10-17erg/s/cm2/Angstrom.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Source running number 5- 11 F7.2 0.1nm lambdaH High-S/N median wavelength (1) 13- 19 F7.2 0.1nm lambdaL Low-S/N median wavelength (1) 21- 25 F5.1 0.1nm EqWH ? High-S/N line width (1) 27- 31 F5.1 0.1nm EqWL ? Low-S/N line width (1) 33- 37 F5.2 --- PskewH ? High-S/N Pearson skewness value 39- 43 F5.2 --- PskewL ? Low-S/N Pearson skewness value
Note (1): In units of Angstroms.
History: From electronic version of the journal References: Wilhite et al., Paper I 2005ApJ...633..638W, Cat. <J/ApJ/633/638
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 27-Jul-2007
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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