Mapping Matter in Strong Gravity: Spectral-Timing of Black Holes and Neutron Stars

强引力下的物质绘图：黑洞和中子星的光谱计时

• 批准号: 1801792
• 负责人: Abigail Stevens
• 金额: $ 10万
• 依托单位: Stevens Abigail L
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1801792&HistoricalAwards=false
• 关键词: Mapping; Matter; Strong; Gravity; Spectral

Abigail Stevens is awarded an NSF Astronomy and Astrophysics Fellowship to carry out a program of research and education at Michigan State University and at the University of Michigan. Stevens will study the X-rays emitted when black holes and neutron stars interact with low-mass stars, focusing on very rapid changes in emission called quasi-periodic oscillations (QPOs). Stevens will study how the energy spectrum and timing of X-rays changes during QPOs. This is a probe of how matter behaves close to black holes and neutron stars, and it will help astronomers to better understand the strong gravitational and magnetic fields found nowhere else in nature. Alongside her research, Stevens will establish a middle school outreach program in the Lansing Public School District. There she will develop and lead activity-based interactive astronomy lessons on the topics of the Sun, the Solar System, and supermassive black holes and galaxies.Stevens will use phase-resolved spectroscopy of different types of QPOs and pulsations in low-mass X-ray binaries (LXMBs), which contain a compact object, a low-mass stellar companion, and an accretion disk of stellar material around the compact object. She will use a spectral-timing technique developed during her PhD thesis, as well as comprehensive physical models, to compare the geometry of the emitting region in black holes with that in neutron stars and determine the changing inner configuration of LMXBs in the strong-gravity regime. This work will lead to better understanding of intense gravitational fields, viscous astrophysical plasmas, and very strong magnetic fields. Stevens will also work with outreach facilities at her host universities to conduct astronomy enrichment in local area middle school classes. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

阿比盖尔·史蒂文斯被授予NSF天文学和天体物理学奖学金，以在密歇根州立大学和密歇根大学开展一项研究和教育项目。史蒂文斯将研究黑洞和中子星与低质量恒星相互作用时发出的X射线，重点是称为准周期振荡(QPO)的发射的非常快速的变化。史蒂文斯将研究在QPO期间X射线的能谱和时间是如何变化的。这是一个探测物质在黑洞和中子星附近的行为的探测器，它将帮助天文学家更好地理解自然界中其他地方找不到的强大引力场和磁场。除了她的研究，史蒂文斯还将在兰辛公立学区建立一个中学推广项目。在那里，她将开发和领导以活动为基础的互动天文学课程，主题为太阳、太阳系和超大质量黑洞和星系。史蒂文斯将使用低质量X射线双星(LXMBs)中不同类型的QPO和脉动的相分辨光谱，LXMBs包含一个致密天体、一个低质量恒星伴星和一个围绕致密天体的恒星物质吸积盘。她将使用博士论文期间开发的光谱计时技术，以及全面的物理模型，比较黑洞和中子星发射区的几何形状，并确定LMXB在强引力区域内的变化。这项工作将导致更好地理解强烈的引力场、粘性天体物理等离子体和非常强的磁场。史蒂文斯还将与她所在大学的外展机构合作，在当地的中学课堂上进行天文学丰富。这一奖项反映了NSF的法定使命，并通过使用基金会的学术价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

SunPy: A Python package for Solar Physics

• DOI: 10.21105/joss.01832
• 发表时间: 2020-02
• 期刊: J. Open Source Softw.
• 作者: S. Mumford;N. Freij;S. Christe;J. Ireland;F. Mayer;V. Hughitt;A. Shih;D. Ryan;Simon Liedtke;D. Pérez-Suárez;Pritish Chakraborty;K. Vishnunarayan;A. Inglis;Punyaslok Pattnaik;B. Sipocz;Rishabh Sharma;Andrew Leonard;D. Stansby;Russell J. Hewett;Alex Hamilton;L. Hayes;A. Panda;M. Earnshaw;Nitin Choudhary;Ankit Kumar;Prateek Chanda;Haque;M. Kirk;Michael Mueller;Sudarshan Konge;Rajul Srivastava;Y. Jain;Samuel Bennett;A. Baruah;W. Barnes;Michael C. Charlton;S. Maloney;N. Chorley;Himanshu;Sanskar Modi;James Mason;Naman;J. Rozo;L. Manley;Agneet Chatterjee;John G Evans;Michael Malocha;M. Bobra;Sourav Ghosh;Airmansmith;D. Stańczak;R. Visscher;Shresth Verma;Ankit Agrawal;Dumindu Buddhika;Swapnil Sharma;Jongyeob Park;M. Bates;Dhruv Goel;Garrison Taylor;Goran Cetušić;Jacob;Mateo Inchaurrandieta;S. Dacie;Sanjeev Dubey;Deepankar Sharma;E. Bray;J. Rideout;S. Zahniy;T. Mészáros;Abhigyan Bose;André Chicrala;Ankit;C. Guennou;D. D'Avella;Daniel Williams;J. Ballew;Nick Murphy;P. Lodha;T. Robitaille;Yash Krishan;Andrew Hill;A. Eigenbrot;B. Mampaey;Bernhard M. Wiedemann;Carlos Molina;Duygu Keşkek;Ishtyaq Habib;J. Letts;Juanjo Bazán;Quinn Arbolante;Reid Gomillion;Yash Kothari;Yash Sharma;A. Stevens;A. Price-Whelan;Ambar Mehrotra;A. Kustov;Brandon Stone;Trung Kien Dang;Emmanuel Arias;F. Dover;F. Verstringe;Gulshan Kumar;Harsh Mathur;I. Babuschkin;J. Wimbish;J. Buitrago-Casas;Kalpesh Krishna;Kaustubh Hiware;Manasi D. Mangaonkar;Matthew Mendero;Mickaël Schoentgen;N. Gyenge;O. Streicher;R. Mekala;R. Mishra;Shashank Srikanth;Sarthak Jain;Tannmay Yadav;T. Wilkinson;T. Pereira;Yudhik Agrawal;Jamescalixto;Yasintoda;S. Murray

Radius Constraints from Reflection Modeling of Cygnus X-2 with NuSTAR and NICER

使用 NuSTAR 和 NICER 对 Cygnus X-2 进行反射建模的半径约束

• DOI: 10.3847/1538-4357/ac5028
• 发表时间: 2022
• 期刊: The Astrophysical Journal
• 作者: Ludlam, R. M.;Cackett, E. M.;García, J. A.;Miller, J. M.;Stevens, A. L.;Fabian, A. C.;Homan, J.;Ng, M.;Guillot, S.;Buisson, D. J.
• 通讯作者: Buisson, D. J.

An Empirical Background Model for the NICER X-Ray Timing Instrument

• DOI: 10.3847/1538-3881/ac4ae6
• 发表时间: 2021-05
• 期刊: The Astronomical Journal
• 作者: R. Remillard;M. Loewenstein;J. Steiner;G. Prigozhin;B. LaMarr;T. Enoto;K. Gendreau;Z. Arzoumanian;C. Markwardt;A. Basak;A. Stevens;P. Ray;D. Altamirano;D. Buisson

A Rapid Change in X-Ray Variability and a Jet Ejection in the Black Hole Transient MAXI J1820+070

• DOI: 10.3847/2041-8213/ab7932
• 发表时间: 2020-03
• 期刊: The Astrophysical Journal Letters
• 作者: J. Homan;J. Bright;S. Motta;D. Altamirano;Z. Arzoumanian;A. Basak;T. Belloni;E. Cackett;R. Fender;K. Gendreau;E. Kara;D. Pasham;R. Remillard;J. Steiner;A. Stevens;P. Uttley

Spectral Variability of a Soft-intermediate State QPO from MAXI J1820+070

MAXI J1820 070 软中间态 QPO 的光谱变化

• DOI: 10.3847/2515-5172/ab9f39
• 发表时间: 2020
• 期刊: Research Notes of the AAS
• 作者: Davis, M. C.;Stevens, A. L.
• 通讯作者: Stevens, A. L.