Multiband optical-NIR variability of blazars on diverse time-scales

被引：30

作者：

Agarwal, Aditi ^{[1
,2
]}

Gupta, Alok C. ^{[1
,2
,3
]}

Bachev, R. ^{[4
,5
]}

Strigachev, A. ^{[4
,5
]}

Semkov, E. ^{[4
,5
]}

Wiita, Paul J. ^{[6
]}

Boettcher, M. ^{[7
]}

Boeva, S. ^{[4
,5
]}

Gaur, H. ^{[3
,8
]}

Gu, M. F. ^{[3
]}

Peneva, S. ^{[4
,5
]}

Ibryamov, S. ^{[4
,5
]}

Pandey, U. S. ^{[2
]}

机构：

[1] Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263002, India

[2] DDU Gorakhpur Univ, Dept Phys, Gorakhpur 273009, Uttar Pradesh, India

[3] Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China

[4] Bulgarian Acad Sci, Inst Astron, BU-1784 Sofia, Bulgaria

[5] Bulgarian Acad Sci, Natl Astron Observ, BU-1784 Sofia, Bulgaria

[6] Coll New Jersey, Dept Phys, Ewing, NJ 08628 USA

[7] North West Univ, Space Res Ctr, ZA-2520 Potchefstroom, South Africa

[8] IUCAA, Pune 411007, Maharashtra, India

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 451卷 / 04期

基金：

新加坡国家研究基金会; 美国国家科学基金会;

关键词：

galaxies: active; BL Lacertae objects: general; BL Lacerate objects: individual: 3C 454.3; BL Lacerate objects: individual: 3C 279; BL Lacerate objects: individual: S5 0716+714; ACTIVE GALACTIC NUCLEI; BL-LACERTAE OBJECTS; SPECTRAL ENERGY-DISTRIBUTIONS; READHEAD SURVEY SOURCES; NEAR-INFRARED INTRADAY; COMPLETE RADIO SAMPLE; LARGE-AREA TELESCOPE; 3C; 454.3; S5 0716+714; MICROVARIABILITY OBSERVATIONS;

D O I：

10.1093/mnras/stv1208

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

To search for optical variability on a wide range of time-scales, we have carried out photometric monitoring of two flat spectrum radio quasars, 3C 454.3 and 3C 279, plus one BL Lac, S5 0716+714, all of which have been exhibiting remarkably high activity and pronounced variability at all wavelengths. CCD magnitudes in B, V, R, and I passbands were determined for similar to 7000 new optical observations from 114 nights made during 2011-2014, with an average length of similar to 4 h each, at seven optical telescopes: four in Bulgaria, one in Greece, and two in India. We measured multiband optical flux and colour variations on diverse time-scales. Discrete correlation functions were computed among B, V, R, and I observations, to search for any time delays. We found weak correlations in some cases with no significant time lags. The structure function method was used to estimate any characteristic time-scales of variability. We also investigated the spectral energy distribution of the three blazars using B, V, R, I, J, and K passband data. We found that the sources almost always follow a bluer-when-brighter trend. We discuss possible physical causes of the observed spectral variability.

引用

页码：3882 / 3897

页数：16

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