The Event Horizon Explorer mission concept

The Event Horizon Explorer (EHE) is a mission concept to extend the Event Horizon Telescope via an additional space-based node. We provide highlights and overview of a concept study to explore the feasibility of such a mission. We present science goals and objectives, which include studying the immediate environment around supermassive black holes, and focus on critical enabling technologies and engineering challenges. We provide an assessment of their technological readiness and overall suitability for a NASA Medium Explorer (MIDEX) class mission.

[1]  Frédéric E. Vincent,et al.  Photon ring test of the Kerr hypothesis: Variation in the ring shape , 2022, Astronomy & Astrophysics.

[2]  Marcos Emir Moreno Nolasco,et al.  First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way , 2022, The Astrophysical Journal Letters.

[3]  W. T. Roberts,et al.  TBIRD 200-Gbps CubeSat Downlink: System Architecture and Mission Plan , 2022, 2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS).

[4]  M. Wielgus.  Photon rings of spherically symmetric black holes and robust tests of non-Kerr metrics , 2021, Physical Review D.

[5]  Paul Hartogh,et al.  Orbiting Astronomical Satellite for Investigating Stellar Systems (OASIS): following the water trail from the interstellar medium to oceans , 2021, Optical Engineering + Applications.

[6]  Daniel C. M. Palumbo,et al.  Universal interferometric signatures of a black hole’s photon ring , 2019, Science Advances.

[7]  C. Gammie,et al.  The Shadow of a Spherically Accreting Black Hole , 2019, The Astrophysical Journal.

[8]  Daniel C. M. Palumbo,et al.  Studying Black Holes on Horizon Scales with VLBI Ground Arrays , 2019, 1909.01411.

[9]  Daniel C. M. Palumbo,et al.  Studying black holes on horizon scales with space-VLBI. , 2019, 1909.01405.

[10]  Scott A. Merritt,et al.  Progress and plans for a U.S. laser system for the LISA mission , 2019, International Conference on Space Optics.

[11]  Daniel C. M. Palumbo,et al.  First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring , 2019, The Astrophysical Journal.

[12]  Chih-Wei L. Huang,et al.  First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole , 2019 .

[13]  S. T. Timmer,et al.  First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole , 2019, 1906.11238.

[14]  Daniel C. M. Palumbo,et al.  First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole , 2019, The Astrophysical Journal.

[15]  K. Cossel,et al.  Femtosecond time synchronization of optical clocks off of a flying quadcopter , 2018, Nature Communications.

[16]  Bernard L. Edwards,et al.  Latest changes to NASA's laser communications relay demonstration project , 2018, LASE.

[17]  P. Ho,et al.  Resolved magnetic-field structure and variability near the event horizon of Sagittarius A* , 2015, Science.

[18]  Hugo Bergeron,et al.  Synchronization of Distant Optical Clocks at the Femtosecond Level , 2015, 1509.07888.

[19]  Alan E. E. Rogers,et al.  Jet-Launching Structure Resolved Near the Supermassive Black Hole in M87 , 2012, Science.

[20]  Randall J. Alliss,et al.  The mitigation of Atmospheric Impacts on Free Space Optical Communications , 2012 .

[21]  A. Niell,et al.  Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre , 2008, Nature.

[22]  A. Marscher,et al.  Relativistic Jets in Active Galactic Nuclei , 2006 .

[23]  Keith E. Wilson,et al.  Deep-space optical communications link availability and data volume , 2004, SPIE LASE.

[24]  Edward Teo.  Spherical Photon Orbits Around a Kerr Black Hole , 2003 .

[25]  S. Tremaine,et al.  The Demography of Massive Dark Objects in Galaxy Centers , 1997, astro-ph/9708072.

[26]  J. Bardeen.  Timelike and null geodesics in the Kerr metric. , 1973 .

[27]  Phillip Capper.  The Proceedings , 2020, International Arbitration: A Handbook.