| Multiwavelength observations of the BL lacertae object PKS 2155-304 with XMM-Newton | |
Zhang, YH1; Bai JM(白金明)2 ; Zhang, SN1; Treves, A3; Maraschi, L4; Celotti, A5; Zhang, YH (reprint author), Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China.
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| 发表期刊 | ASTROPHYSICAL JOURNAL
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| 2006-11-10 | |
| 卷号 | 651期号:2页码:782-790 |
| DOI | 10.1086/507601 |
| 产权排序 | 第2完成单位 |
| 收录类别 | SCI |
| 关键词 | Bl Lacertae Objects : Individual (Pks 2155-304) Galaxies : Active Methods : Data Analysis Ultraviolet : Galaxies X-rays : Galaxies |
| 摘要 | The optical/UV and X-ray instruments on board XMM-Newton provide an excellent opportunity to perform simultaneous observations of violently variable objects over a broad wavelength range. The UV- and X-ray-bright BL Lac object PKS 2155-304 has been observed repeatedly with XMM-Newton about twice per year. In this paper, we present a detailed analysis of the simultaneous multiwavelength variability of the source from optical to X-rays, based on the currently available XMM-Newton observations. These observations probed the intraday multiwavelength variability at optical/UV and X-ray wavelengths of the source. The UV variability amplitude is substantially smaller than the X-ray one, and the hardness ratios of the UV to X-rays correlates with the X-ray fluxes: the brighter the source, the flatter the UV/X-ray spectra. On 2000 May 30-31, the UV and X-ray light curves were weakly correlated, while the UV variations followed the X-ray ones with no detectable lags on 2000 November 19-21. On 2001 November 30, the source exhibited a major X-ray flare that was not detected in the optical. The intraday UV and X-ray variability presented here is not similar to the interday UV and X-ray variability obtained from the previous coordinated extensive multiwavelength campaigns on the source, indicating that different "modes'' of variability might be operating in PKS 2155-304 on different timescales or from epoch to epoch. |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0004-637X |
| URL | 查看原文 |
| WOS记录号 | WOS:000241825000016 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | ACTIVE GALACTIC NUCLEI ; X-RAY VARIABILITY ; LOG-PARABOLIC SPECTRA ; ENERGY GAMMA-RAYS ; PKS 2155-304 ; PARTICLE-ACCELERATION ; EPIC-PN ; MARKARIAN 501 ; IUE CAMPAIGN ; EMISSION |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4945 |
| 专题 | 高能天体物理研究组 |
| 通讯作者 | Zhang, YH (reprint author), Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China. |
| 作者单位 | 1.Department of Physics and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing 100084, China 2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China 3.Dipartimento di Scienze, Universit? degli Studi dell'Insubria, via Valleggio 11, I-22100 Como, Italy 4.Osservatorio Astronomico di Brera, via Brera 28, I-20121 Milan, Italy 5.International School for Advanced Studies, SISSA/ISAS, via Beirut 2-4, I-34014 Trieste, Italy |
| 推荐引用方式 GB/T 7714 | Zhang, YH,Bai JM,Zhang, SN,et al. Multiwavelength observations of the BL lacertae object PKS 2155-304 with XMM-Newton[J]. ASTROPHYSICAL JOURNAL,2006,651(2):782-790. |
| APA | Zhang, YH.,Bai JM.,Zhang, SN.,Treves, A.,Maraschi, L.,...&Zhang, YH .(2006).Multiwavelength observations of the BL lacertae object PKS 2155-304 with XMM-Newton.ASTROPHYSICAL JOURNAL,651(2),782-790. |
| MLA | Zhang, YH,et al."Multiwavelength observations of the BL lacertae object PKS 2155-304 with XMM-Newton".ASTROPHYSICAL JOURNAL 651.2(2006):782-790. |
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