J/ApJ/537/101 Optical Study for blazars. I. (Fan+, 2000)
Optical variability and periodicity analysis for blazars. I.
Light curves for radio-selected BL Lacertae objects.
Fan J.H., Lin R.G.
<Astrophys. J., 537, 101-122 (2000)>
=2000ApJ...537..101F 2000ApJ...537..101F
ADC_Keywords: BL Lac objects ; Photometry, UBVRI
Keywords: BL Lacertae objects: general - galaxies: photometry - polarization
Abstract:
Photometric observations of AGNs are important to construct light
curves and to study variability behavior over different timescales. In
this paper, the historical optical data compiled from the published
literature are presented in tabular form as an optical database for 28
radio-selected BL Lacertae objects. Maximum optical variations are
found and compared with the infrared ones. The faintest, brightest,
and averaged magnitudes are presented for individual object. The
variation is found correlated with polarization. The light curves are
shown in figures along with the relation between color index and
magnitude. For the color-magnitude relation, two objects, 0735+178 and
0537-441, show evidence that the color index increases with magnitude,
indicating that the spectrum flattens when the source brightens, while
three objects (0219+428, 1514-241, 2200+420) show the opposite
behavior; an object, 0235+164, shows a brightness-dependent color
index- magnitude correlation, while the rest of the objects do not
show any clear tendency.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
objects.dat 48 29 Positions (from Simbad)
table2.dat 87 5961 Optical observations of 29 radio-selected
BL Lacertae objects
refs.dat 97 163 References
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See also:
J/A+AS/114/337 : CCD photometric observations of blazars (Jia Guibin+, 1995)
J/A+AS/121/119 : Optical monitoring of gamma-ray loud blazars I (Villata+ 1997)
J/A+AS/127/445 : Gamma-ray loud blazars optical monitoring. II (Raiteri+ 1998)
J/A+AS/128/315 : BVRI photometry of blazars (Jia Guibin+ 1998)
J/AJ/115/1253 : Deep X-Ray Radio Blazar Survey (DXRBS). I. (Perlman+ 1998)
J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)
Byte-by-byte Description of file: objects.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Object name
13- 14 I2 h RAh Simbad Right ascension (J2000)
16- 17 I2 min RAm Simbad Right ascension (J2000)
19- 22 F4.1 s RAs Simbad Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 32 I2 arcsec DEs Declination (J2000)
36- 48 A13 --- SName Simbad name
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Object name
11- 20 F10.2 d HJD Julian date of observation
22- 26 F5.2 mag Umag ? U band magnitude
28- 31 F4.2 mag e_Umag ? Error in Umag
34- 38 F5.2 mag Bmag ? B band magnitude
40- 43 F4.2 mag e_Bmag ? Error in Bmag
46- 50 F5.2 mag Vmag ? V band magnitude
52- 55 F4.2 mag e_Vmag ? Error in Vmag
58- 62 F5.2 mag Rmag ? R band magnitude
64- 67 F4.2 mag e_Rmag ? Error in Rmag
70- 74 F5.2 mag Imag ? I band magnitude
76- 79 F4.2 mag e_Imag ? Error in Imag
82- 87 A6 --- r_Name References for the observations (in refs.dat file)
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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- 6 A6 --- Ref Reference code
9- 27 A19 --- bibCode BibCode
29- 55 A27 --- Aut Author's name
57- 97 A41 --- Com Comments
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History:
From ApJ electronic version
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 29-Aug-2000