THE WHOLE EARTH BLAZAR TELESCOPE CAMPAIGN ON THE INTERMEDIATE BL LAC OBJECT 3C 66A IN 2007-2008
文献类型：期刊论文
| 作者 | Bottcher, M.1; Fultz, K.1; Aller, H. D.2; Aller, M. F.2; Apodaca, J.3; Arkharov, A. A.4; Bach, U.5; Bachev, R.6; Berdyugin, A.7; Buemi, C.8 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2009-03-20 |
| 卷号 | 694期号:1页码:174-182 |
| 关键词 | BL Lacertae objects: individual (3C 66A) galaxies: active gamma rays: theory radiation mechanisms: non-thermal |
| 英文摘要 | Prompted by a high optical state in 2007 September, the Whole Earth Blazar Telescope consortium organized an intensive optical, near-IR (JHK) and radio observing campaign on the intermediate BL Lac object 3C 66A throughout the fall and winter of 2007-2008. In this paper, we present data from 28 observatories in 12 countries, covering the observing season from late 2007 July through 2008 February. The source remained in a high optical state throughout the observing period and exhibited several bright flares on timescales of similar to 10 days. This included an exceptional outburst around 2007 September 15-20, reaching a peak brightness at R similar to 13.4. Our campaign revealed microvariability with flux changes up to vertical bar dR/dt vertical bar similar to 0.02 mag hr(-1). Our observations do not reveal evidence for systematic spectral variability in the overall high state covered by our campaign, in agreement with previous results. In particular, we do not find evidence for spectral hysteresis in 3C 66A for which hints were found in an earlier campaign in a somewhat lower flux state. We also did not find any evidence for spectral lags in the discrete correlation functions between different optical bands. We infer a value of the magnetic field in the emission region of B similar to 19 e(B)(2/7) tau(-6/7)(h) D(1)(13/7) G, where e(B) is the magnetic field equipartition fraction, tau(h) is the shortest observed variability timescale in units of hours, and D(1) is the Doppler factor in units of 10. From the lack of systematic spectral variability, we can derive an upper limit on the Doppler factor, D <= 28 tau(-1/8)(h) e(B)(3/16). This is in perfect agreement with superluminal motion measurements with the VLBI/VLBA of beta(app) <= 27 and argues against models with very high Lorentz factors of Gamma greater than or similar to 50, required for a one-zone synchrotron-self-Compton interpretation of some high-frequency-peaked BL Lac objects detected at TeV gamma-ray energies. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000264291700017 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8318]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Ohio Univ, Dept Phys & Astron, Inst Astrophys, Athens, OH 45701 USA 2.Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA 3.Univ Colorado, Dept Phys, Denver, CO 80217 USA 4.Pulkovo Observ, St Petersburg 196140, Russia 5.Max Planck Inst Radioastron, Radioobserv Effelsberg, D-53902 Bad Munstereifel Effelsb, Germany 6.Bulgarian Acad Sci, Inst Astron, BU-1784 Sofia, Bulgaria 7.Univ Turku, Tuorla Observ, Piikkio 21500, Finland 8.Osserv Astrofis Catania, I-95125 Catania, Italy 9.Osservatorio Armenzano, Assisi, Italy 10.Univ Bordeaux, Observ Aquitain Sci Univers, Floirac, France |
| 推荐引用方式 GB/T 7714 | Bottcher, M.,Fultz, K.,Aller, H. D.,et al. THE WHOLE EARTH BLAZAR TELESCOPE CAMPAIGN ON THE INTERMEDIATE BL LAC OBJECT 3C 66A IN 2007-2008[J]. ASTROPHYSICAL JOURNAL,2009,694(1):174-182. |
| APA | Bottcher, M..,Fultz, K..,Aller, H. D..,Aller, M. F..,Apodaca, J..,...&Zhou, X..(2009).THE WHOLE EARTH BLAZAR TELESCOPE CAMPAIGN ON THE INTERMEDIATE BL LAC OBJECT 3C 66A IN 2007-2008.ASTROPHYSICAL JOURNAL,694(1),174-182. |
| MLA | Bottcher, M.,et al."THE WHOLE EARTH BLAZAR TELESCOPE CAMPAIGN ON THE INTERMEDIATE BL LAC OBJECT 3C 66A IN 2007-2008".ASTROPHYSICAL JOURNAL 694.1(2009):174-182. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。