TEMPORAL CORRELATIONS BETWEEN OPTICAL AND GAMMA-RAY ACTIVITY IN BLAZARS

被引：66

作者：

Cohen, Daniel P. ^{[1
,2
]}

Romani, Roger W. ^{[3
]}

Filippenko, Alexei V. ^{[1
]}

Cenko, S. Bradley ^{[4
]}

Lott, Benoit ^{[5
,6
]}

Zheng, WeiKang ^{[1
]}

Li, Weidong ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[3] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[4] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[5] Univ Bordeaux, CENBG, UMR 5797, F-33170 Gradignan, France

[6] CENBG, IN2P3, CNRS, UMR 5797, F-33170 Gradignan, France

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 797卷 / 02期

基金：

美国国家科学基金会;

关键词：

BL Lacertae objects: general; galaxies: active; galaxies: jets; quasars: general; LARGE-AREA TELESCOPE; FERMI-DETECTED BLAZARS; GALACTIC NUCLEI; MULTIWAVELENGTH OBSERVATIONS; RELATIVISTIC JETS; FLARING ACTIVITY; BRIGHT BLAZARS; VARIABILITY; RADIO; EMISSION;

D O I：

10.1088/0004-637X/797/2/137

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have been using the 0.76 m Katzman Automatic Imaging Telescope (KAIT) at Lick Observatory to optically monitor a sample of 157 blazars that are bright in gamma-rays being detected with high significance (>= 10 sigma) in one year by the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. We attempt to observe each source on a three-day cadence with KAIT, subject to weather and seasonal visibility. The gamma-ray coverage is essentially continuous. KAIT observations extend over much of the five-year Fermi mission for several objects, and most have > 100 optical measurements spanning the last three years. These blazars (flat-spectrum radio quasars and BL Lac objects) exhibit a wide range of flaring behavior. Using the discrete correlation function (DCF), here we search for temporal relationships between optical and gamma-ray light curves in the 40 brightest sources in hopes of placing constraints on blazar acceleration and emission zones. We find strong optical-gamma-ray correlation in many of these sources at time delays of similar to 1 to similar to 10 days, ranging between -40 and +30 days. A stacked average DCF of the 40 sources verifies this correlation trend, with a peak above 99% significance indicating a characteristic time delay consistent with 0 days. These findings strongly support the widely accepted leptonic models of blazar emission. However, we also find examples of apparently uncorrelated flares (optical flares with no gamma-ray counterpart and gamma-ray flares with no optical counterpart) that challenge simple, one-zone models of blazar emission. Moreover, we find that flat-spectrum radio quasars tend to have gamma-rays leading the optical, while intermediate-and high-synchrotron peak blazars with the most significant peaks have smaller lags/leads. It is clear that long-term monitoring at high cadence is necessary to reveal the underlying physical correlation.

引用

页数：11

共 33 条

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