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 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:
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FileName Lrecl Records Explanations
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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
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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
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Note (1): Where microvariability was detected. Unit assumed to be hours.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 50 A27 --- Aut Author's name
54- 63 A10 --- Com Comments
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 11-Dec-2008