J/A+AS/143/465 Quasar variability (Hawkins+, 2000)
Quasar variability: Correlations with amplitude.
Hawkins M.R.S.
<Astron. Astrophys. Suppl. Ser. 143, 465 (2000)>
=2000A&AS..143..465H 2000A&AS..143..465H
ADC_Keywords: QSOs ; Photometry, UBV ; Redshifts
Keywords: quasars: general
Abstract:
The relation between quasar variability and parameters such as
luminosity and redshift has been a matter of hot debate over the last
few years with many papers on the subject. Any correlations which can
be established will have a profound effect on models of quasar
structure and evolution. The sample of quasars with redshifts in
ESO/SERC field 287 contains over 600 quasars in the range 0<z<3.5 and
is now large enough to bin in luminosity and redshift, and give
definitive measures of the correlations. We find no significant
correlation between amplitude and redshift, except perhaps at very low
redshift, but an inverse correlation between amplitude and luminosity.
This is examined in the context of various models for quasar
variability.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
appen.dat 62 385 Details of all three samples
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Byte-by-byte Description of file: appen.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (1950)
4- 5 I2 min RAm Right ascension (1950)
7- 11 F5.2 s RAs Right ascension (1950)
13 A1 --- DE- Declination sign (1950)
14- 15 I2 deg DEd Declination (1950)
17- 18 I2 arcmin DEm Declination (1950)
20- 23 F4.1 arcsec DEs [0,60] Declination (1950)
25- 29 F5.2 mag Bmag B magnitude
31- 35 F5.2 mag U-B U-B colour index
37- 40 F4.2 mag dmag Magnitude amplitude (1)
42- 46 F5.3 --- z Redshift
48- 53 F6.2 mag BMag Absolute B magnitude
56 I1 --- S1 [0/1] 1: QSO belongs to VAR sample
59 I1 --- S2 [0/2] 2: QSO belongs to UVX sample
62 I1 --- S3 [0/3] 3: QSO belongs to AMP sample
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Note (1): The amplitude is the difference between maximum and minimum
magnitude achieved over the 20 year run of data
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History: From A&AS electronic version
(End) Patricia Bauer [CDS] 29-May-2000