Time lags between the 22 and 37 GHz bursts of 48 radio-loud AGNs

	Time lags between the 22 and 37 GHz bursts of 48 radio-loud AGNs
	Deng WG(邓文国)1,2 ; Bai JM(白金明)1 ; Zhang, L2 ; Yang, Xian 1,2
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2008-04
卷号	8 期号:2 页码:195-203
关键词	galaxies : active galaxies : individual (3C 273 methods : data analysis 3C 279 3C 345 3C 454.3)
ISSN号	1009-9271
通讯作者	Deng, WG (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	Based on the light curves at 22 and 37 GHz from the Metsahovi monitoring program, we investigate the time lags between the two radio bands for 48 radio-loud AGNs. DCF and ZDCF analyses are applied to the data. Our results show that there is a strong correlation between the two radio frequencies for all the sources, with the variations in the light curves at 37 GHz leading the ones at 22 GHz in general. There is no obvious differences between different sub-class AGNs as regards the time lag. In two sources, it was found that the bursts at the lower frequency lead the ones at the higher frequency. One possible explanation is that electron acceleration dominates the light curve until the radiation reaches the maximum. Some sources, such as 3C 273, 3C 279, 3C 345 and 3C 454.3, have good enough data, so we can calculate their lags burst-by-burst. Our calculations show that different outbursts have different lags. Some bursts have positive lags, most of bursts have no clear lags, and a few have negative lags. This result means that different bursts are triggered by different mechanisms, and the interpretation for the result involves both an intrinsic and a geometric mechanism. The positive lags are well consistent with the shock model, and we use these lags to calculate the typical magnetic field strength of the radiating region.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GAMMA-RAY BURSTS ; ACTIVE GALACTIC NUCLEI ; BL-LACERTAE OBJECTS ; EXTRAGALACTIC SOURCES ; OPTICAL VARIATIONS ; CORRELATED RADIO ; SPECTRAL LAGS ; RAPID VARIABILITY ; SHOCK-MODELS ; 87 GHZ
收录类别	SCI
原文出处	http://iopscience.iop.org/1009-9271/8/2/06/
语种	英语
WOS记录号	WOS:000255262600006
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/7041]
专题	云南天文台_星系研究组
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 2.Physics Department, Yunnan University, Kunming 650091
推荐引用方式 GB/T 7714	Deng WG,Bai JM,Zhang, L,et al. Time lags between the 22 and 37 GHz bursts of 48 radio-loud AGNs[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2008,8(2):195-203.
APA	Deng WG,Bai JM,Zhang, L,&Yang, Xian.(2008).Time lags between the 22 and 37 GHz bursts of 48 radio-loud AGNs.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,8(2),195-203.
MLA	Deng WG,et al."Time lags between the 22 and 37 GHz bursts of 48 radio-loud AGNs".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 8.2(2008):195-203.