What kind of telescope was used to get pictures of the black hole?
Luciano Rezzolla
Alongside Heino Falcke and Michael Kramer, he received a
14 million euro research grant of the European Research Council for further
studies into black holes with the goal to construct a black hole camera using the Event Horizon Telescope. This would allow testing of general theory of relativity by creating an image of the black hole shadow.
Halton Arp
Since the 1960s, telescopes and astronomical instrumentation have advanced greatly: the Hubble Space Telescope was launched, and cosmological theory and observation has advanced considerably. Black holes and supermassive black holes have been directly as well as indirectly detected, extremely distant objects are routinely studied and contextualized, and multiple 8-10 meter telescopes (such as those at Keck Observatory and the Very Large Telescope) have become operational, and detectors such as CCDs are now more widely employed. These developments, have led to quasars being understood to be very distant active galaxies with high redshifts. Many imaging surveys, most notably the Hubble Deep Field, have found many high-redshift objects that are not QSOs but that appear to be normal galaxies like those found nearby. The spectra of the high-redshift galaxies, as seen from X-ray to radio wavelengths, match the spectra of nearby galaxies (particularly galaxies with high levels of star formation activity but also galaxies with normal or extinguished star formation activity) when corrected for redshift effects.