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| Query : 2004AJ....128.1929Z |
2004AJ....128.1929Z - Astron. J., 128, 1929-1941 (2004/November-0)
Optical monitoring of three gamma-ray-loud BL Lacertae objects in 1999-2002.
ZHANG X., ZHANG L., ZHAO G., XIE Z.-H., WU L. and ZHENG Y.-G.
Abstract (from CDS):
We present the results of optical photometric (BVRI) monitoring of three gamma-ray-loud BL Lac objects (3C 66A, PKS 0735+178, and BL Lacertae) in 1999-2002. During our observations, these objects showed significant rapid variations: 3C 66A and PKS 0735+178 exhibit short-timescale (∼1 hr) variability in the B band, and BL Lac exhibits intraday variability in B and V. We find that there is a strong correlation between brightness and color for 3C 66A and BL Lac. We have analyzed the relationship between optical variability and gamma-ray variability and discuss theoretical models for gamma-ray-loud BL Lac emission. We have found shorter time variability for 3C 66A and PKS 0735+178 compared with previous reports.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: BL Lacertae Objects: General - gamma rays: observations
CDS comments: Table 1 : standard stars not in SIMBAD. Par. 4 : PKS 537-411 is a misprint for PKS 0537-441, PKS 1406-074 = PKS 1406-076
Simbad objects: 8
| Number of rows : 8 |
| N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2026 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 3C 66A | BLL | 02 22 39.6114771888 | +43 02 07.799534304 | 15.71 | 15.21 | 14.5 | ~ | 942 | 2 | ||
| 2 | QSO J0530+13 | Bla | 05 30 56.41674741 | +13 31 55.1494688 | 20.00 | 19.35 | ~ | 1004 | 1 | |||
| 3 | QSO B0537-441 | BLL | 05 38 50.36155950 | -44 05 08.9390233 | 15.77 | 16.48 | 16 | ~ | 924 | 2 | ||
| 4 | QSO J0738+1742 | BLL | 07 38 07.39375312 | +17 42 18.9981506 | 16.76 | 16.22 | 15.78 | ~ | 1045 | 1 | ||
| 5 | Z 184-50 | BLL | 11 04 27.3140835504 | +38 12 31.798495872 | 13.50 | 12.90 | 8.31 | ~ | 2841 | 1 | ||
| 6 | QSO B1406-076 | Bla | 14 08 56.48120623 | -07 52 26.6665312 | 20.3 | 18.4 | ~ | 336 | 1 | |||
| 7 | 4C 38.41 | Bla | 16 35 15.49297809 | +38 08 04.5005995 | 18.14 | 17.97 | 17.25 | ~ | 906 | 1 | ||
| 8 | NAME BL Lac | BLL | 22 02 43.2913536816 | +42 16 39.979416792 | 15.66 | 14.72 | ~ | 2397 | 1 |
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