From astrobites: “Hunting for new physics in a black hole’s shadow”

Astrobites bloc

astrobites

Jan 24, 2018
Aaron Tohuvavohu

Title: Event Horizon Telescope Observations as Probes for Quantum Structure of Astrophysical Black Holes
Authors: Steven B. Giddings & Dimitrios Psaltis
First Author’s Institution: University of California, Santa Barbara

Status: Submitted to Phys Rev D, open access on the arXiv.

For 5 days in April of 2017, 8 radio telescopes on 4 continents all pointed in concert at Sagittarius A*, the supermassive black hole at the center of our galaxy.

SGR A* , the supermassive black hole at the center of the Milky Way. NASA’s Chandra X-Ray Observatory

During this observing campaign these 8 telescopes effectively became one Earth-sized radio telescope, the Event Horizon Telescope (EHT).

Event Horizon Telescope Array

Arizona Radio Observatory
Arizona Radio Observatory/Submillimeter-wave Astronomy (ARO/SMT)

ESO/APEX
Atacama Pathfinder EXperiment

CARMA Array no longer in service
Combined Array for Research in Millimeter-wave Astronomy (CARMA)

Atacama Submillimeter Telescope Experiment (ASTE)
Atacama Submillimeter Telescope Experiment (ASTE)

Caltech Submillimeter Observatory
Caltech Submillimeter Observatory (CSO)

IRAM NOEMA interferometer
Institut de Radioastronomie Millimetrique (IRAM) 30m

James Clerk Maxwell Telescope interior, Mauna Kea, Hawaii, USA
James Clerk Maxwell Telescope interior, Mauna Kea, Hawaii, USA

Large Millimeter Telescope Alfonso Serrano
Large Millimeter Telescope Alfonso Serrano

CfA Submillimeter Array Hawaii SAO
Submillimeter Array Hawaii SAO

ESO/NRAO/NAOJ ALMA Array
ESO/NRAO/NAOJ ALMA Array, Chile

South Pole Telescope SPTPOL
South Pole Telescope SPTPOL

Future Array/Telescopes

Plateau de Bure interferometer
Plateau de Bure interferometer

NSF CfA Greenland telescope

Greenland Telescope

Using hydrogen maser atomic clocks to track the difference in the arrival times of the radio signal at the various telescopes, the far-flung array can emulate a single telescope with an effective diameter equal to that of our planet, a technique called very long baseline interferometry (VLBI).

See the full article here .

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