The incoming Imaging X-ray Polarimetry Explorer (IXPE) observations of X-ray binaries provide a new tool to investigate the underlying accretion geometry. Here we report the first measurements of X-ray polarization of the extra-galactic black-hole X-ray binary LMC X$-$3. We find a polarization fraction of $\sim 3%$ at a polarization angle of $\sim 135^\circ$ in the $2-8$ keV energy band with statistical significance at the 7$σ$ level. This polarization measurement significantly exceeds the minimum detectable polarization threshold of 1.2% for the source, ascertained at a 99% confidence level within the $2-8$ keV energy band. The simultaneous spectro-polarimetric fitting of NICER, Swift/XRT, and IXPE revealed the presence of a disc with a temperature of $\sim$1 keV and a Comptonized component with a power-law index of $\sim$ 2.4, confirming the soft nature of the source. The polarization degree increases with energy from $\sim$3% in the $2-5.7$ keV band to $\sim$9% in the $5.7-8$ keV band, while the polarization angle is energy independent. The observed energy dependence and the sudden jump of polarization fraction above 5 keV supports the idea of a static slab coronal geometry for the Comptonizing medium of LMC X$-$3.
A spectral and timing study of MAXI J1535-571, based on Swift/XRT, XMM-Newton and NICER observations obtained in fall 2017
我们对2017年秋季新探测到的X射线瞬态MAXI J1535-571进行了光谱定时分析。在我们的研究中,我们包括38个Swift/XRT窗口定时模式观测,3个XMM-牛顿观测和31个NICER观测。计算了黑洞瞬变过程中常用的基本图,拟合了功率密度和能谱,研究了谱参数和时间参数的演化。观测到的性质与明亮的黑洞X射线双星($F_{\mathrm{0.6-10 keV}}^{\mathrm{max}}=3.71\pm0.02\times10^{-7}$ erg cm $^{-2}$ s $^{-1}$)一致,该双星从低硬态演化到高软态,再回到低硬态。在一些观测中,功率密度谱显示出C型准周期振荡,这进一步证明了MAXI J1535-571在这些观测中处于硬态。不到10天的软状态持续时间非常短,2018年春季的观测表明,MAXI J1535-571进入了第二个(更长)软状态。
Probing the emission geometry of the X-ray pulsar 2S 1417$-$624 during a weak outburst with NICER, IXPE, and NuSTAR
Institut für Astronomie und Astrophysik, Universität Tübingen(蒂宾根大学天文与天体物理研究所);Research Center of Astronomy, QingHai University(青海大学天文研究中心);Department of Physics and Astronomy, QingHai University(青海大学物理与天文系);Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所粒子天体物理重点实验室);University of Chinese Academy of Sciences, Chinese Academy of Sciences(中国科学院大学)
Decoding Cygnus X-2: The Critical Role of Reflection in IXPE Data
Fudan University(复旦大学);Eberhard-Karls Universität Tübingen(蒂宾根大学);University of Warwick(华威大学);Newcastle University(纽卡斯尔大学);New Uzbekistan University(新乌兹别克斯坦大学);University of Cambridge(剑桥大学);INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(意大利国家天体物理研究所博洛尼亚天文与空间科学观测站);Wayne State University(韦恩州立大学);University of Amsterdam(阿姆斯特丹大学);Anton Pannekoek Institute for Astronomy, University of Amsterdam(阿姆斯特丹大学安东·范·佩内贝克克天文学研究所);Astronomical Institute of the Czech Academy of Sciences(捷克科学院天文研究所)
Peering through the dip: IXPE unveils the extended scattering environment of GX 13+1
INAF–Istituto di Astrofisica e Planetologia Spaziali(意大利国家天体物理研究所空间天体物理学与行星学研究所);Nordita, Stockholm University and KTH Royal Institute of Technology(诺登理论天体物理研究所,斯德哥尔摩大学和皇家理工学院);INAF–Osservatorio Astronomico di Roma(意大利国家天体物理研究所罗马天文台);INAF–Osservatorio Astronomico di Cagliari(意大利国家天体物理研究所卡利亚里天文台);Department of Astronomy and Astrophysics, University of Chicago(芝加哥大学天文学与天体物理学系)
Discovery of energy-dependent phase variations in the polarization angle of Cen X-3
State Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所粒子天体物理国家重点实验室);University of Chinese Academy of Sciences(中国科学院大学);Department of Astronomy, University of Geneva(日内瓦大学天文系)
Pulse profile modelling of the 2024 outburst of the accreting millisecond pulsar SRGA J144459.2-604207
Anton Pannekoek Institute for Astronomy, University of Amsterdam(阿姆斯特丹大学安顿·潘内科克天文学研究所);University of Helsinki(赫尔辛基大学);Gravitation and Astroparticle Physics Amsterdam (GRAPPA), University of Amsterdam(阿姆斯特丹引力与高能物理研究所(GRAPPA));McGill University(麦吉尔大学);Trottier Space Institute, McGill University(麦吉尔大学特罗蒂尔太空研究所);University of Turku(图尔库大学);INAF Istituto di Astrofisica e Planetologia Spaziali(意大利国家天体物理学研究所);Monash University(蒙纳士大学);Institute for Globally Distributed Open Research and Education (IGDORE)(全球分布式开放研究与教育研究所);University of Toulouse(图卢兹大学);Università degli Studi di Roma “Tor Vergata”(罗马托维加塔大学);Newcastle University(纽卡斯尔大学);INAF Osservatorio Astronomico di Roma(意大利国家天体物理学研究所罗马天文台);Nanjing University(南京大学);Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education(教育部现代天体学与天体物理学重点实验室(南京大学))
Constraining the Corona Geometry of Cyg X-1 with Broad Band Spectrum and Polarimetric Analysis Based on Observations in May 2022
Hiroshima University(广岛大学);National Institute of Technology, Ichinoseki College(国立技术研究所一关学院);University of Durham(杜伦大学);Graduate School of Advanced Science and Engineering, Hiroshima University(广岛大学先进理工学研究科);Center for Computational Sciences, University of Tsukuba(筑波大学计算科学中心)
X-Ray Polarization from the Atoll 4U 1735-44 Suggests a Low Inclination
University of Turku(图尔库大学);Nordic Optical Telescope(北欧光学望远镜);NASA Marshall Space Flight Center(美国宇航局马歇尔太空飞行中心);Università degli Studi Roma Tre(罗马第三大学);INAF Istituto di Astrofisica e Planetologia Spaziali(意大利国家天体物理研究所空间天体物理学和行星科学研究所)
X-ray and Radio Campaign of the Z-source GX 340+0 II: the X-ray polarization in the normal branch
Tata Institute of Fundamental Research(塔塔基础研究所);INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica(意大利国家天体物理研究所,空间天体物理学与宇宙学研究所);McGill University(麦吉尔大学);Indian Institute of Astrophysics(印度天体物理研究所);Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所粒子天体物理重点实验室);MIT Kavli Institute for Astrophysics and Space Research(麻省理工学院卡弗里天体物理学与空间研究学院);Department of Physics, Indian Institute of Technology Hyderabad(印度技术学院海得拉巴分校物理系);Eureka Scientific, Inc.(尤里卡科学公司)
X-ray polarization of Z-type neutron star low-mass X-ray binaries -- I. Model-independent, time-resolved X-ray polarimetry
Università degli Studi Roma Tre(罗马第三大学);INAF – Istituto di Astrofisica e Planetologia Spaziali(意大利国家天体物理研究所);INAF – Osservatorio Astronomico di Cagliari(意大利国家天体物理研究所卡利亚里天文台);INAF – Osservatorio di Astrofisica e Scienza dello Spazio(意大利国家天体物理研究所空间科学天文台)
University of Lodz(罗兹大学);Nordita, KTH Royal Institute of Technology and Stockholm University(诺迪塔,皇家理工学院和斯德哥尔摩大学);Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences(波兰科学院尼古拉·哥白尼天文学中心);Institute of Physics, University of Zielona Góra(热舒夫大学物理研究所)
X-ray Observations of Nova Scorpii 2023 (V1716 Sco) in Outburst
University of Wisconsin-Madison(威斯康星大学麦迪逊分校);Slovak University of Technology in Bratislava(布拉迪斯拉发斯洛伐克工业大学);University of Leicester(莱斯特大学);Technion(以色列理工学院);Lockheed Martin Solar and Astrophysics Laboratory(洛克希德·马丁太阳与天体物理实验室)
X-ray spectropolarimetric characterization of the Z-source GX 340+0 in the normal branch
INAF--Istituto di Astrofisica e Planetologia Spaziali(意大利国家天体物理研究所);Institute of Space Sciences (ICE, CSIC)(空间科学研究所);Institut d'Estudis Espacials de Catalunya (IEEC)(加泰罗尼亚太空研究院);INAF--Osservatorio Astronomico di Brera(意大利国家天体物理研究所布里耶拉天文台);University of Turku(图尔库大学);Wayne State University(韦恩州立大学);Guangxi University(广西大学);Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);University of Chinese Academy of Sciences(中国科学院大学);Beijing Normal University(北京师范大学)
Unchanged X-Ray Polarization During Accretion Dips in the Low Hard State of Cygnus X-1
Guangxi University(广西大学);INAF Istituto di Astrofisica e Planetologia Spaziali(意大利国家天体物理研究所空间天体物理学和行星科学研究所);Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所)
X-ray polarization of Z-type neutron star low-mass X-ray binaries -- II. Spectropolarimetric analysis
NASA Marshall Space Flight Center(美国国家航空航天局马歇尔太空飞行中心);Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre(罗马第三大学数学与物理系);INAF – Istituto di Astrofisica e Planetologia Spaziali(意大利国家天体物理研究所空间天体物理学与行星科学研究所);INAF Osservatorio Astronomico di Cagliari(意大利国家天体物理研究所卡利亚里天文台);INAF – Osservatorio di Astrofisica e Scienza dello Spazio(意大利国家天体物理研究所天体物理学与空间科学观测站)
研究 Z 型中子星低质量 X 射线双星的 X 射线偏振,利用 IXPE、NICER 和 NuSTAR 数据进行光谱偏振分析,发现连续 X 射线发射可用热吸积盘发射加康普顿化成分描述,各分支偏振度及偏振角有特点,且偏振信号与倾角等无相关性。