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INTEGRAL and Swift/XRT observations of the source PKS 0208-512
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)
2010
发表期刊ASTRONOMY & ASTROPHYSICS
卷号514页码:A69
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
文章类型Article
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.
关键词X-rays: individuals: PKS 0208-512
学科领域Astronomy & Astrophysics
DOI10.1051/0004-6361/200913655
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语种英语
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000280504800036
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/241074
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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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.
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