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Astrophsyics

X-ray Science Interest Group

Decadal Survey White Paper Projects

To add to this list, please fill in the Google Form here: https://goo.gl/forms/ZXzdzcUrR81Cso153

List of X-ray science white papers submitted by community members to the XRSIG:


Physics of hot intracluster plasma from high-resolution X-ray imaging

Lead AuthorMaxim Markevitch
Lead Author emailm.markevitch@gmail.com
CoauthorsJ. ZuHone, M. Ruszkowski, S. Walker, others still to invite
Looking for coauthors? 
Looking for cosigners? 
Looking for external people to provide comments? 
Key wordsgalaxy clusters; intracluster medium; X-rays; radio; shock fronts; cold fronts; radio relics; plasma depletion regions; thermal conductivity; electron-ion equilibration; viscosity; magnetic field structure; particle acceleration
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
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Probing Macro-Scale Gas Motions and Turbulence in Galaxy Clusters Outskirts

Lead AuthorEsra Bulbul
Lead Author emailebulbul@cfa.harvard.edu
CoauthorsMax Gaspari, Nicolas Clerc, Edoardo Cucchetti, Dominique Eckert, Stefano Ettori, Fabio Gastaldello, Vittorio Ghirardini, Ralph Kraft, Tony Mroczkowski, Paul Nulsen, Gabriel W. Pratt, Etienne Pointecouteau, Mauro Roncarelli, Randall Smith, John ZuHone
Looking for coauthors?No
Looking for cosigners?No
Looking for external people to provide comments?No
Key words 
Link to white paper/drafthttps://www.overleaf.com/project/5bdb3891a6c4204079b0fb62
Abstract 
Any other comments or suggestions? 
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Do Supermassive Black Hole Winds Impact Galaxy Evolution?

Lead AuthorFrancesco Tombesi
Lead Author emailftombesi@astro.umd.edu
CoauthorsM. Cappi, G. Chartas, K. Fukumura, M. Guainazzi, D. Kazanas, G. Kriss, D. Proga, T. J. Turner, Y. Ueda, S. Veilleux
Looking for coauthors?No
Looking for cosigners?Yes
Looking for external people to provide comments?No
Key wordsSupermassive black hole; AGN winds; Galaxy evolution; Athena
Link to white paper/drafthttps://drive.google.com/file/d/1yy3hsajhVGYVXBFj84vg2J-bYOicyKs_/view?usp=sharing
Abstract 
Any other comments or suggestions? 
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X-ray Studies of Supernova Remnants

Lead AuthorBrian Williams
Lead Author emailbrian.j.williams@nasa.gov
CoauthorsSamar Safi-Harb, Paul Plucinsky, Tea Temim, Katie Auchettl, Laura Lopez, Hiroya Yamaguchi, Dan Patnaude, Carles Badenes, Jacco Vink, John Raymond, Daniel Castro, Pat Slane, Oleg Kargaltsev, Koji Mori, Takaaki Tanaka
Looking for coauthors?No
Looking for cosigners?No
Looking for external people to provide comments?No
Key wordssupernovae; supernova remnants
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
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Density measurement of X-ray outflows (warm absorbers and ultra fast outflows)

Lead AuthorSibasish Laha
Lead Author emailsib.laha@gmail.com
CoauthorsFrancesco Tombesi, Tim Kallman, Randall Smith, Gerard Kriss, Sylvain Veilleux, +
Looking for coauthors?Yes
Looking for cosigners?Yes
Looking for external people to provide comments?Yes
Key wordsX-ray outflows; density measurement; distance; Kinetic energy of outflows
Link to white paper/draft 
AbstractX-ray ionized outflows (warm absorbers and ultra fast outflows) from the central regions of an active galactic nucleus (AGN) has been postulated to be one of the most powerful feedback mechanisms by which the central super massive black hole interacts with the host galaxy. To obtain an accurate estimate of the total kinetic energy (E_K) carried by the X-ray ionized outflows in AGN (observed as blue shifted absorption lines) we need to have a good handle on their distances (r) from the central active nuclei. However, the distance (r) of an absorbing system is not easy to estimate because what we observe/measure is a 'total absorption column density (NH)' without any information as to where and how the absorbing media (clouds) are located along the line of sight. By assuming that the ionized clouds are in photo-ionization equilibrium with the incident photon flux from the central AGN, we can express the ionization parameter of the cloud as \xi= L/(n*r^2), where L is the ionizing luminosity, n is the electron density and r is the distance of the cloud. By measuring \xi from the absorption features and L from the ionizing luminosity, if we can know the density of the cloud (n), we can get the distance r.

Two most important ways to obtain the density of the clouds are: 1. Use the "Density Diagnostic" absorption line ratios in X-rays. and 2. The response of the ionization parameter of the WA/UFO clouds to changes in the ionizing continuum in UV-Xrays. In either cases it is important to identify individual absorption lines in the (soft and hard) X-ray spectra with sufficient signal to noise ratio (SNR).

Until now, with the exception of only a few bright sources, it has not been possible to constrain individual absorption line equivalent widths in X-rays, because the current generation X-ray telescopes do not have the required spectral resolution, nor the effective area to achieve detectable SNR. Future missions such as Athena, Lynx, Xrism and Arcus will have the required throughput as well as resolution in the soft and hard X-rays to carry out density diagnostic studies of the ionized outflows.

This white paper deals with 1. current state of our knowledge on the X-ray absorption line density diagnostics (diagnostic line ratios and variability), and the corresponding outflow-physics/atomic-physics involved 2. The theoretical work that needs to be done, 3. How the future missions Athena, Lynx, Xrism and Arcus will be helpful in revolutionizing the density and distance measurements and thereby accurately estimating kinetic outflow rates and several other physical quantities.
Any other comments or suggestions?Please do read the abstract and let me (Sibasish Laha) know if you are interested to be a co-author. Thanks.
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Galaxy cluster outskirts and the cosmic web with high resolution, low background X-ray imaging

Lead AuthorStephen Walker
Lead Author emailstephen.a.walker@nasa.gov
CoauthorsM. Markevitch et al.
Looking for coauthors? 
Looking for cosigners? 
Looking for external people to provide comments? 
Key wordscluster outskirts; missing baryons; whim; metals; cosmic web; filaments;
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
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Unlocking the Capabilities of Future High-Resolution X-ray Spectroscopy Missions Through Laboratory Astrophysics

Lead AuthorG. Betancourt-Martinez
Lead Author emailgabriele.betancourt@irap.omp.eu
CoauthorsHiroki Akamatsu, Didier Barret, Manuel Bautista, Sven Bernitt, Gabriele Betancourt, Stefano Bianchi, Dennis Bodewits, Nancy Brickhouse, Greg Brown, Marcello Coreno, Jose Crespo, Renata Cumbee, Monica De Simone, Jan-Willem den Herder, Megan Eckart, Gary Ferland, Fabrizio Fiore, Mike Fogle, Adam Foster, Javier Garcia, Tom Gorczyca, Victoria Grinberg, Nicolas Grosso, Liyi Gu, Ming-Feng Gu, Matteo Guainazzi, Natalie Hell, Jelle Kaastra, Tim Kallman, Julia Lee, Maurice Leutenegger, Joan Marler, Dan McCammon, Shinya Nakashima, Fabrizio Nicastro, Frits Paerels, Francois Pajot, Etienne Pointecouteau, Delphine Porquet, Scott Porter, Daniel Savin, Makoto Sawada, Chintan Shah, Aurora Simionescu, Chad Sosolik, Phil Stancil, Rene Steinbruegge, Hiroya Yamaguchi
Looking for coauthors? 
Looking for cosigners? 
Looking for external people to provide comments? 
Key wordslaboratory astrophysics, AGN outflows, AGN feedback, galaxy evolution, missing baryons
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
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Supermassive Black Hole Spin and Reverberation

Lead AuthorAbdu Zoghbi
Lead Author emailabzoghbi@umich.edu
CoauthorsD. R. Wilkins, G. Miniutti, G. Matt, J. Garcia, E. Kara, E. Cackett, B.De Marco, M. Dovciak, et al.
Looking for coauthors? 
Looking for cosigners? 
Looking for external people to provide comments? 
Key wordsBlack holes; AGN; Spin; Reverberation
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
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Cooking with X-rays: Can X-ray binaries heat the early Universe?

Lead AuthorA.R. Basu-Zych
Lead Author emailantara.r.basu-zych@nasa.gov
CoauthorsA. Mesinger, B. Greig, B. Lehmer, P. Tzanavaris, T. Fragos. A. Hornschemeier, F. Mirabel, A. Ptak
Looking for coauthors?No
Looking for cosigners?No
Looking for external people to provide comments?No
Key wordsX-ray binaries; galaxies; galaxy evolution; X-ray scaling relations; cosmology
Link to white paper/draft 
AbstractX-rays from high mass X-ray binaries within the first primordial galaxies likely played a significant role in heating the early Universe at z ≳10. While observing distant z > 1 galaxies is prohibitively expensive, studying a sample of relatively nearby (z ‹ 0.05) low metallicity galaxies is within reach and offers several advantages: (1) a complete and unbiased survey of the stochasticity in X-ray scaling relations and (2) measurements of the shape of their X-ray spectra. Combining observations with next generation X-ray telescopes with upcoming measurements of the cosmic 21-cm signal will have the power to reveal the interstellar medium (ISM) structure of the first primordial galaxies and their X-ray source population.
Any other comments or suggestions? 
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Accretion in Stellar-mass Black Holes at High X-ray Resolution

Lead AuthorJon M. Miller
Lead Author emailjonmm@umich.edu
CoauthorsDidier Barret, Edward Cachet, Maria Diaz Trigo, Christine Done, Elena Gallo, Jelle Kaastra, Christian Motch, Ciro Pinto, Gabriele Ponti, Natalie Webb, Abderahmen Zoghbi
Looking for coauthors?No
Looking for cosigners?No
Looking for external people to provide comments?No
Key wordsDidier Barret, Edward Cachet, Maria Diaz Trigo, Christine Done, Elena Gallo, Jelle Kaastra, Christian Motch, Ciro Pinto, Gabriele Ponti, Natalie Webb, Abderahmen Zoghbi
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
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SMBH demographics in the the 2030s with ATHENA

Lead AuthorNico Cappelluti, Francesca Civano
Lead Author emailncappelluti@miami.edu
CoauthorsStefano Marchesi, Steph La Massa, Andy Goulding, Steph LaMassa, Andrea Comastri, Meg Urry, Niel Brandt, Marcella Brusa, Francisco Carrera, Giorgio Lanzuisi, Marco Ajello, Mackenzie Jones, Francesca Fornasini, Antonis Georgakakis, James Aird, Paul Nandra, Martin Elvis
Looking for coauthors?No
Looking for cosigners?No
Looking for external people to provide comments?Yes
Key wordsAGN, Cosmology
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
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Time Domain Studies of Neutron Star and Black Hole Populations: Precision Identification of Compact Object Types

Lead AuthorNeven Vulic
Lead Author emailneven.vulic@nasa.gov
CoauthorsAnn Hornschemeier, Vallia Antoniou, Antara Basu-Zych, Breanna Binder, Francesca Fornasini, Felix Furst, Frank Haberl, Marianne Heida, Bret Lehmer, Thomas Maccarone, Andrew Ptak, Panayiotis Tzanavaris, Dan Wik, Ben Williams, Jorn Wilms, Mihoko Yukita, Andreas Zezas
Looking for coauthors?No
Looking for cosigners?No
Looking for external people to provide comments?No
Key wordsX-ray Binaries; Transients; Galaxies
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
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Much higher resolution X-ray telescopes with diffractive-refractive optics with

Lead AuthorPaul Gorenstein
Lead Author emailpgorenstein@cfa.harvard.edu
Coauthors 
Looking for coauthors?Yes
Looking for cosigners?Yes
Looking for external people to provide comments?Yes
Key wordsdiffractive; refractive X-ray optics; high angular resolution;
Link to white paper/drafthttp://hea-www.cfa.harvard.edu/~goren/higher-angular-resolution_Xray_tel.pdf
AbstractDiffractive-refractive X-ray telescopes can have milli arc second angular resolution. However, focal lengths are >1000 KM requiring the optics and detector to be aboard widely separated spacecraft that are aligned along the source direction. One of the spacecraft has to be powered by, for example, an ion engine to maintain the alignment and change targets. The effective area can be large but the bandwidth for milli arc second resolution is ~10%. Diffractive-refractive X-ray telescopes will be a useful tool for study of the environments of super massive black holes and the active regions o f nearby stars.
Any other comments or suggestions? 
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Galaxy Cluster Cosmology and Astrophysics

Lead AuthorAdam Mantz
Lead Author emailamantz@stanford.edu
CoauthorsSteve Allen, others to invite
Looking for coauthors?Yes
Looking for cosigners?Yes
Looking for external people to provide comments?Yes
Key wordsgalaxy clusters; intracluster medium; X-rays; radio; optical/IR; AGN feedback; cosmology
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
Top

Probing the black hole engine with measurements of the relativistic reflection component

Lead AuthorJavier Garcia, John Tomisck, et al.
Lead Author emailjavier@caltech.edu
Coauthors 
Looking for coauthors? 
Looking for cosigners? 
Looking for external people to provide comments? 
Key wordsBlack holes; accretion disks; X-ray reflection; spectral-timing
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
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Physics of black hole feedback in galaxy clusters

Lead AuthorMateusz Ruszkowski
Lead Author emailmateuszr@umich.edu
CoauthorsDaisuke Nagai, Kaustuv Basu, Jens Chluba, Megan Donahue, Massimo Gaspari, Julie Hlavacek-Larrondo, Edmund Hodges-Kluck, Michael McDonald, Brian McNamara, Tony Mroczkowski, Richard Mushotzky, Christopher Reynolds, Alexey Vikhlinin, Norbert Werner, Hsiang-Yi Karen Yang, Irina Zhuravleva, Ellen Zweibel
Looking for coauthors?Yes
Looking for cosigners?Yes
Looking for external people to provide comments?Yes
Key wordsgalaxy clusters; physics of black hole feedback; non-thermal particles in AGN bubbles; turbulence and velocity perturbations excited by AGN; ICM transport processes and coupling of the AGN energy to the ICM
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
Top

X-rays Studies of the Solar System

Lead AuthorBradford Snios
Lead Author emailbradford.snios@cfa.harvard.edu
CoauthorsWilliam Dunn, Carey Lisse, Scott J. Wolk, Konrad Dennerl, Vasili Kharchenko, Michael R. Combi, Anil Bhardwaj, G. Randall Gladstone, Thomas E. Cravens, Dennis Bodewits, Graziella Branduardi-Raymont, Caitriona M. Jackman, Ralph P. Kraft, Susan Nulsen
Looking for coauthors?Yes
Looking for cosigners?Yes
Looking for external people to provide comments?Yes
Key wordsPlanets; Minor bodies; Planetary satellites; Comets; Solar wind; Atmosphere
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
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Detecting the Birth of Supermassive Black Holes Formed from Heavy Seeds

Lead AuthorFabio Pacucci
Lead Author emailfabio.pacucci@yale.edu
CoauthorsAlexey Vikhlinin, Zoltan Haiman, Grant R. Tremblay, Priyamvada Natarajan, Megan C. Urry, Vivienne Baldassare, Nico Cappelluti, Andrea Ferrara, Marta Volonteri
Looking for coauthors?No
Looking for cosigners?No
Looking for external people to provide comments?Yes
Key wordsblack hole seeds; observational properties: IR, X-ray, GW; seeding models; JWST; Lynx; Athena; LISA; high-z survey planning
Link to white paper/draft 
Abstract 
Any other comments or suggestions? 
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X-ray follow-up of extragalactic transients

Lead AuthorErin Kara
Lead Author emailekara@astro.umd.edu
CoauthorsWen-fai Fong, Azadeh Keivani, Brad Cenko, Raffaella Margutti, Richard Mushotzky, Derek Fox, Regina Caputo, Eric Burns, Scott Noble, Geoff Ryan
Looking for coauthors?Yes
Looking for cosigners?Yes
Looking for external people to provide comments?Yes
Key wordsTime Domain Astronomy; Multi-messanger astronomy; Tidal disruption events; black hole mergers; neutron star mergers; neutrino counterparts
Link to white paper/draft 
AbstractWhat X-rays tell us about: Tidal disruption events; LISA supermassive black hole binary counterparts, LIGO NS-NS/NS-BH counterparts; superluminal supernovae; blazars as neutrino counterparts
Any other comments or suggestions? 
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PCOS News

Program News and Announcements

1 February 2019
Dr Terri Brandt confirmed as PCOS Chief Scientist.
20 December 2018
LISA Preparatory Science 2018 (LPS) proposals have been selected! »  Full details
17 December 2018
NASA HQ has publicly posted an updated Astrophysics Implementation Plan (AIP), detailing progress made by NASA's Astrophysics Division in implementing the 2010 Decadal recommendations since the previous update in 2016. Please see »  full details
29 November 2018
The National Academies has released updated information about the 2020 Decadal Survey call for Community Science White Papers. They are now due 7 January–19 February 2019. See here for further instructions. Further, it is our pleasure to announce that the President of the National Academy of Sciences Marcia McNutt has appointed Dr. Fiona Harrison and Dr. Robert Kennicutt, Jr. to serve as co-chairs of the Astronomy and Astrophysics Decadal Survey committee.

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