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J/AJ/133/303   Optical microvariability in radio-quiet quasars  (Carini+, 2007)

Optical microvariability in radio-quiet quasars. Carini M.T., Noble J.C., Taylor R., Culler R. <Astron. J., 133, 303-312 (2007)> =2007AJ....133..303C
ADC_Keywords: QSOs ; Photometry Keywords: galaxies: photometry - quasars: general Abstract: We report the results of a study of optical microvariability in radio-quiet and radio-intermediate quasars. Observations were obtained on a total of seven objects: five radio-quiet quasars and two radio-intermediate quasars. No microvariability was detected in either the radio-quiet or radio-intermediate objects in our sample, despite intensive monitoring for several consecutive nights. In one object, PG 1257+346, evidence for interday variability was detected. We examined a sample of 117 radio-quiet objects found in the literature that have been studied for microvariability. This sample is discussed in terms of classification, redshift distribution, R (the ratio of the radio [5GHz] flux to the optical [4400Å] flux), optical magnitude, luminosity, and observing strategy. Description: The observations of radio-quiet and radio-intermediate quasars presented here were obtained with the 1.05m Hall and the 1.8m Perkins telescope at Lowell Observatory. Each telescope was equipped with a direct CCD camera and standard Johnson and Kron-Cousins BVRI filters. All the observations presented here were obtained through a V or R filter. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 56 7 Radio-quiet and radio-intermediate quasars observed table3.dat 92 117 Total sample of radio quiet galaxies observed refs.dat 63 22 References
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Quasar name 14- 15 I2 h RAh Right ascension (J2000) 17- 18 I2 min RAm Right ascension (J2000) 20- 23 F4.1 s RAs Right ascension (J2000) 25 A1 --- DE- Declination sign (J2000) 26- 27 I2 deg DEd Declination (J2000) 29- 30 I2 arcmin DEm Declination (J2000) 32- 33 I2 arcsec DEs Declination (J2000) 35- 39 F5.3 --- z Redshift 41 A1 --- l_R Limit flag on R 42- 45 F4.2 --- R ?=- R-value (ratio of the radio [5GHz] flux to the optical [4400Å] flux) 47- 52 F6.2 mag BMAG Absolute B magnitude 54- 56 A3 --- Qcl [RQQ,RIQ] Radio-Quiet or Radio-Intermediate Quasar
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Name Object name 17- 22 F6.4 --- z Redshift 24- 30 A7 --- Class Object classification 32- 33 A2 --- f_R Limit flag on R 35- 39 F5.3 --- R ? The R value (ratio of the radio [5GHz] flux to the optical [4400Å] flux) 41- 46 F6.2 mag MAG ? Absolute magnitude in n_mag 48- 53 F6.3 mag mag Apparent magnitude in n_mag 55 A1 --- n_mag [bv] Observational band 57 A1 --- Var [yn] Exhibits microvariability? 59- 75 A17 h Dur Duration of the observation(s) (1) 77- 78 I2 --- Na Total attempts to detect microvariability 80- 92 A13 --- Ref Reference(s), detailed in refs.dat file
Note (1): Where microvariability was detected. Unit assumed to be hours.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 50 A27 --- Aut Author's name 54- 63 A10 --- Com Comments
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 11-Dec-2008
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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