INTEGRAL and Swift/XRT observations of the source PKS 0208-512
文献类型：期刊论文
| 作者 | Zhang S(张澍) ; Zhang, S; Collmar, W; Torres, DF; Wang, JM; Lang, M; Zhang, SN; Wang JM(王建民); Zhang SN(张双南)
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2010 |
| 卷号 | 514页码:A69 |
| 关键词 | X-rays: individuals: PKS 0208-512 |
| 通讯作者 | [Zhang, S. ; Wang, J. -M. ; Zhang, S. -N.] Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Collmar, W. ; Lang, M.] Max Planck Inst Extraterr Phys, D-85740 Garching, Germany ; [Torres, D. F.] IEEC CSIC, Fac Ciencias, ICREA, Barcelona 08193, Spain ; [Torres, D. F.] IEEC CSIC, Fac Ciencias, Inst Ciencies Espai, Barcelona 08193, Spain |
| 英文摘要 | Aims. The active galaxy PKS 0208-512, detected at lower energies by COMPTEL, has been claimed to be a MeV blazar from EGRET. We report on the most recent INTEGRAL observations of the blazar PKS 0208-512, which are supplemented by Swift ToO observations. Methods. The high energy X-ray and gamma-ray emission of PKS 0208-512 during August-December 2008 has been studied using 682 ks of INTEGRAL guest observer time and similar to 56 ks of Swift/XRT observations. These data were collected during the decay of a gamma-ray flare observed by Fermi/LAT. Results. At X-ray energies (0.2-10 keV) PKS 0208-512 is significantly detected by Swift/XRT, showing a power-law spectrum with a photon index of similar to 1.64. Its X-ray luminosity varied by roughly 30% during one month. At hard X-/soft gamma-ray energies PKS 0208-512 shows a marginally significant (similar to 3.2 sigma) emission in the 0.5-1 MeV band when combining all INTEGRAL/SPI data. Non-detections at energies below and above this band by INTEGRAL/SPI may indicate intrinsic excess emission. If this possible excess is produced by the blazar, one possible explanation could be that its jet consists of an abundant electron-positron plasma, which may lead to the emission of an annihilation radiation feature. Assuming this scenario, we estimate physical parameters of the jet of PKS 0208-512. |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 原文出处 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000280504800036 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/241074]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Zhang S,Zhang, S,Collmar, W,et al. INTEGRAL and Swift/XRT observations of the source PKS 0208-512[J]. ASTRONOMY & ASTROPHYSICS,2010,514:A69. |
| APA | 张澍.,Zhang, S.,Collmar, W.,Torres, DF.,Wang, JM.,...&张双南.(2010).INTEGRAL and Swift/XRT observations of the source PKS 0208-512.ASTRONOMY & ASTROPHYSICS,514,A69. |
| MLA | 张澍,et al."INTEGRAL and Swift/XRT observations of the source PKS 0208-512".ASTRONOMY & ASTROPHYSICS 514(2010):A69. |
入库方式： OAI收割
来源：高能物理研究所
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