☆ 4.7 Article

BROAD RELATIVISTIC IRON EMISSION LINE OBSERVED IN SAX J1808.4-3658

ASTROPHYSICAL JOURNAL LETTERS (2009)

Journal

ASTROPHYSICAL JOURNAL LETTERS

Volume 694, Issue 1, Pages L21-L25

Publisher

IOP PUBLISHING LTD

DOI: 10.1088/0004-637X/694/1/L21

Keywords

stars: neutron; X-rays: binaries; X-rays: individual (SAX J1808.4-3658)

Categories

Astronomy & Astrophysics

Funding

NASA [PF8-90052]

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Abstract

During the 2008 September-October outburst of the accreting millisecond pulsar SAX J1808.4-3658, the source was observed by both Suzaku and XMM-Newton approximately 1 day apart. Spectral analysis reveals a broad relativistic Fe K alpha emission line which is present in both data sets, as has recently been reported for other neutron star low-mass X-ray binaries. The properties of the Fe K line observed during each observation are very similar. From modeling the Fe line, we determine the inner accretion disk radius to be 13.2 +/- 2.5 GM c(-2). The inner disk radius measured from the Fe K line suggests that the accretion disk is not very receded in the hard state. If the inner disk ( as measured by the Fe line) is truncated at the magnetospheric radius this implies a magnetic field strength of similar to 3 x 10(8) G at the magnetic poles, consistent with other independent estimates.

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Proceedings Paper Engineering, Aerospace

The enhanced X-ray Timing and Polarimetry mission - eXTP: an update on its scientific cases, mission profile and development status

Shuang-Nan Zhang, Andrea Santangelo, Yupeng Xu, Marco Feroci, Margarita Hernanz, Fangjun Lu, Yong Chen, Hua Feng, Kirpal Nandra, Weichun Jiang, Jiri Svoboda, Soren Brandt, Stephane Schanne, Jean in't Zand, Malgorzata Michalska, Enrico Bozzo, Emrah Kalemci, Ivan Agudo, Mahdi Ahangarianabhari, Gabby Aitink-Kroes, Giovanni Ambrosi, Filippo Ambrosino, Zhenghua An, Miguel Angel Perez Torres, Matias Antonelli, Andrea Argan, Viktor Babinec, Luca Baldini, Marco Barbera, Coen van Baren, David Baudin, Joerg Bayer, Ronaldo Bellazzini, Pierluigi Bellutti, Bruna Bertucci, Giuseppe Bertuccio, Xingzi Bi, Mirko Boezio, Valter Bonvicini, Walter Bonvicini, Pol Bordas, Alice Borghese, Giacomo Borghi, Florent Bouyjou, Ayhan Bozkurt, Alessandro Brez, Daniele Brienza, Franck Cadoux, Riccardo Campana, Jiewei Cao, Xuelei Cao, Jorge Casares, Elisabetta Cavazzuti, Francesco Ceraudo, Tianxiang Chen, Wen Chen, Can Chen, Yupeng Chen, Xin Chen, Yehai Chen, Jerome Chenevez, Yaodong Cheng, Daniela Cirrincione, Marta Civitani, Min Cong, Francesco Coti Zelati, Weiwei Cui, Tao Cui, Wei Cui, Boyu Dai, Thomas Dauser, Nicolas De Angelis, Barbara De Marco, Alessandra De Rosa, Ettore Del Monte, Sergio Di Cosimo, Sebastian Diebold, Giuseppe Dilillo, Fei Ding, Roman Dohnal, Zefang Dong, Immacolata Donnarumma, Michal Dovciak, Yuanyuan Du, Lorenzo Ducci, Yuri Evangelista, Qingmei Fan, Yannick Favre, Patricia Ferres, Emanuele Fiandrini, Francesco Ficorella, Fabio Fuschino, Jose Luis Galvez, Na Gao, Min Gao, Yuqiang Ge, Mingyu Ge, Olivier Gevin, Marco Grassi, Yudong Gu, Quanying Gu, Ju Guan, Manuel Guedel, Xingbo Han, Dawei Han, Huilin He, Junwang He, Paul Hedderman, Jan-Willem den Herder, Bin Hong, Ander Hormaetxe, Dongjie Hou, Zexun Hu, Hao Hu, Qingbao Hu, Yu Hu, Yue Huang, Jiangjiang Huang, Qiushi Huang, Jia Huo, Richard Hynek, Kazumi Iwasawa, Lucca Izzo, Long Ji, Shumei Jia, Bowen Jiang, Wei Jiang, Jiechen Jiang, Xiaowei Jiang, Yang Jiao, Ge Jin, Fan Jin, Jordi Jose, Vladimir Karas, Thomas Kennedy, Christian Kirsch, Merlin Kole, Martin Komarek, Ingo Kreykenbohm, Lucien Kuiper, Irfan Kuvvetli, Claudio Labanti, Luca Latronico, Phillip Laubert, Tao Li, Longhui Li, Hong Li, Duo Li, Wei Li, Maoshun Li, Gang Li, Xiaobo Li, Chengkui Li, Bing Li, Haibo Li, Hong Liang, Qiuyan Liao, Jinyuan Liao, Olivier Limousin, Yanjian Lin, Manuel Linares, Rui Liu, Yichen Liu, Zhihao Liu, Hongwei Liu, Xiaojing Liu, Xiaohua Liu, Ugo Lo Cicero, Jens Loehring, Giovanni Lombardi, Maximilian Lorenz, Bing Lu, Leonardo Lucchesi, Tao Luo, Laidan Luo, Jia Ma, Xiang Ma, Daniele Macera, Piero Malcovati, Alberto Manfreda, Josep Maria Paredes, Andrea Marinucci, Adrian Martindale, Norbert Meidinger, Filippo Mele, Vasco Mendes, Bin Meng, Martin Merkl, Aline Meuris, Giovanni Miniutti, Massimo Minuti, Alfredo Morbidini, Gianluca Morgante, Fabio Muleri, Riccardo Munini, Lorenzo Mussolin, Barbara Negri, Jianyin Nie, Petr Novak, Witold Nowosielski, Alessio Nuti, Ahmet Onat, Piotr Orleanski, Leonardo Orsini, Roland Ottensamer, Ge Ou, Luigi Pacciani, Stephane Paltani, Teng Pan, Kai Pan, Giovanni Pareschi, Alessandro Patruno, Giancarlo Pepponi, Emanuele Perinati, Raffaele Piazzolla, Antonino Picciotto, Claudio Piemonte, Michele Pinchera, Samuel Pliego, Juri Poutanen, Liqiang Qi, Fazhi Qi, Pengfei Qiang, Fangjian Qiao, Zheng Qiao, Xiangbiao Qiu, Chengbo Qiu, Jinlu Qu, Alexandre Rachevski, Irina Rashevskaia, Nanda Rea, Marc Ribo, Rob de la Rie, Jerome Rodriguez, Pablo Rodriguez Gil, Gloria Sala, Thomas Schanz, Roberto Serafinelli, Carmelo Sgro, Zhengxiang Shen, Lizhi Sheng, Jingyan Shi, Giorgia Sironi, Konrad Skup, Liming Song, Zeyu Song, Jiangbo Song, Gloria Spandre, Daniele Spiga, Yongquan Su, Liang Sun, Muberra Sungur, Libor Sveda, Gianpiero Tagliaferri, Ying Tan, Lian Tao, Denis Tcherniak, Chris Tenzer, Michela Todaro, Laura Tolos, Gabriel Torok, Diego F. Torres, Alessio Trois, Onur Turhan, Phil Uttley, Andrea Vacchi, Enrico Virgilli, Channah Vogel, Dave Walton, Jian Wang, Xianqi Wang, Bo Wang, Langping Wang, Xiaofeng Wang, Dianlong Wang, Yusa Wang, Juan Wang, Hao Wang, Ruijie Wang, Ping Wang, Lingjun Wang, Wenshuai Wang, Tian Wang, Haoyu Wang, Zhanshan Wang, Anna L. Watts, Xiangyang Wen, Joern Wilms, Berend Winter, Xin Wu, Chao Wu, Zhenyu Wu, Qiong Wu, Kaiji Wu, Hao Xiong, Shaolin Xiong, Wei Xu, Zhao Xu, Jingjing Xu, Xiongwei Xu, Jiadai Xue, Yongqing Yan, Xingtao Yan, Xianghui Yang, Yanji Yang, Xiongtao Yang, Sheng Yang, Jiawei Yang, Yingquan Yang, Shuxu Yi, Yonggao Yu, Ke Yu, Ganluigi Zampa, Nicola Zampa, Silvia Zane, Andrzej A. Zdziarski, Long Zhang, Shu Zhang, Wenda Zhang, Xiaoli Zhang, Zhen Zhang, Jiawei Zhang, Fan Zhang, Ziliang Zhang, Dali Zhang, Honglin Zhang, Aimei Zhang, Tong Zhang, Hongmei Zhang, Juan Zhang, Liang Zhang, Yueting Zhang, Li Zhao, Baosheng Zhao, Zijian Zhao, Xiaofan Zhao, Haisheng Zhao, Xiaoyun Zhao, Shijie Zheng, Yupeng Zhou, Xiaohong Zhou, Jiahuan Zhu, Yuxuan Zhu, Cheng Zhu, Zhencai Zhu, Nicola Zorzi, Frans Zwart

Summary: The enhanced X-ray Timing and Polarimetry mission is a flagship observatory that explores the properties of matter and the propagation of light in extreme conditions found in the Universe. With its advanced technology and capabilities, the mission is of great significance. It is currently in progress and is expected to be completed by mid-2022.

SPACE TELESCOPES AND INSTRUMENTATION 2022: ULTRAVIOLET TO GAMMA RAY (2022)

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