High Energy Astrophysics at Southampton

南安普顿高能天体物理学

• 批准号: PP/D001013/1
• 负责人: Ian McHardy
• 金额: $ 192.8万
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=PP%2FD001013%2F1
• 关键词: Energy; Astrophysics; Southampton

On the smallest scales we are interested in why pulsars seem to favour the low neutral hydrogen environments in the SMC. We are also interested in the products of stellar collisions and near misses in the high density environment of globular clusters, and in studying the compact objects (ie black holes, neutron stars, or white dwarfs) in our Galaxy which are strong emitter of optical light from hydgrogen atoms. Some galactic X-ray binary sources, which consist of black hole of similar mass to our sun together with a more normal star have, as well as accretion discs, through which matter spirals onto the black hole, strong jets. We want to understand the relationship between the emission from jets and from the hot X-ray emitting coronae and to find out how the jet might emerge from the corona. In some cases the disappearance of the inner disc is followed by ejection of material along the jet and we shall determine whether such behaviour is typical in Active Galaxies, ie galaxies whose emission is powered material falling onto (ie being accreted) by a massive black hole. In the 20-100 keV band where absorption of photons by cold gas is unimportant, and so we obtain a very clear view, we are surveying the Galactic Plane with INTEGRAL to determine an unbiased census of compact objects. As time goes on, we will extend that survey to the extragalactic sky. We study the X-ray variability of Active Galaxies to determine how they relate to galactic X-ray binaries sources and whether characteristic timescales reflect only mass or another parameter such as accretion rate. We are interested in the binary populations of nearby galaxies and in the so-called `ultra luminous X-ray sources (ULXs)'. ULXs may be the long sought after black holes with masses intermediate between those of galactic binaries and Active Galaxies and so are very important for testing mass-based scaling relationships. We are interested in how the emission in different wavebands (Gamma-ray, X-ray, optical/IR, radio) in binaries and Active Galaxies is related and what is the dependence on mass. We are interested how the jet emission from Active Galaxies heats clusters of galaxies. On the largest scales, we are interested in whether the different faint source populations which we see in the radio, X-ray and IR bands are just different manifestations of the same underlying phenomenon and how massive black hole growth might be related to growth of the galaxy in which the black hole lives. We are also building detailed theoretical models, using computers, to explain the complicated variability which we see in the sky at high energies.

在最小的尺度上，我们感兴趣的是为什么脉冲星似乎有利于SMC中的低中性氢环境。我们还对球状星团高密度环境中恒星碰撞和近射的产物感兴趣，并研究银河系中致密物体(即黑洞、中子星或白矮星)，它们是氢原子的强光学发射体。一些星系X射线双源，包括与太阳质量相似的黑洞和一颗更正常的恒星，以及吸积盘，物质通过吸积盘螺旋进入黑洞，有强大的喷流。我们想要了解喷流的辐射与发出日冕的热X射线之间的关系，并找出喷流可能如何从日冕中出现。在某些情况下，内盘消失之后是物质沿喷流喷出，我们将确定这种行为是否在活动星系中是典型的，即其发射是由大质量黑洞落在(即被吸积)的物质驱动的星系。在20-100keV波段，冷气体对光子的吸收并不重要，因此我们获得了非常清晰的图像，我们正在对银河系平面进行积分测量，以确定对致密天体的无偏见普查。随着时间的推移，我们将把这项调查扩展到河外天空。我们研究活动星系的X射线可变性，以确定它们与星系X射线双星来源的关系，以及特征时间尺度是否只反映质量或其他参数，如吸积率。我们对附近星系的双星群和所谓的“超发光X射线源(ULX)”感兴趣。ULX可能是长期追逐的黑洞，其质量介于银河系双星和活动星系之间，因此对于测试基于质量的标度关系非常重要。我们感兴趣的是双星和活动星系中不同波段(伽马射线、X射线、光学/IR、射电)的辐射是如何联系的，以及与质量有什么关系。我们感兴趣的是活动星系的喷流如何加热星系团。在最大的尺度上，我们感兴趣的是，我们在无线电、X射线和IR波段中看到的不同微弱源群是否只是同一基本现象的不同表现，以及大规模黑洞增长可能与黑洞所在星系的增长有多大关系。我们还在使用计算机建立详细的理论模型，以解释我们在高能天空中看到的复杂的可变性。

项目成果

Correlation and time delays of the X-ray and optical emission of the Seyfert Galaxy NGC 3783

Seyfert Galaxy NGC 3783 的 X 射线和光学发射的相关性和时间延迟

• DOI: 10.1111/j.1365-2966.2009.15110.x
• 发表时间: 2009
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Arévalo P

IGR J22517+2218=MG3 J225155+2217: A New Gamma-Ray Lighthouse in the Distant Universe

IGR J22517 2218=MG3 J225155 2217：遥远宇宙中的一座新伽马射线灯塔

• DOI: 10.1086/523757
• 发表时间: 2007
• 期刊: The Astrophysical Journal
• 作者: Bassani L

Fourier-resolved energy spectra of the Narrow-Line Seyfert 1 Mkn 766

• DOI: 10.1111/j.1365-2966.2008.13216.x
• 发表时间: 2008-03
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: P. Arévalo;I. McHardy;A. Markowitz;I. Papadakis;I. Papadakis;T. Turner;T. Turner;L. Miller;J. Reeves

Spectral-timing evidence for a very high state in the narrow-line Seyfert 1 Ark 564

• DOI: 10.1111/j.1365-2966.2006.10871.x
• 发表时间: 2006-07
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: P. Arévalo;I. Papadakis;P. Uttley;I. McHardy;W. Brinkmann

X-ray Variability of the Seyfert 1 Markarian 335: Power Spectrum and Time Lags

• DOI: 10.1111/j.1365-2966.2008.13367.x
• 发表时间: 2008-04
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: P. Arévalo;I. McHardy;D. Southampton;UK.