Hubble directly observes the disc around a black hole

An international team of astronomers has used a new technique to study the bright disc of matter surrounding a faraway black hole. Using the NASA/ESA Hubble Space Telescope, combined with the gravitational lensing effect of stars in a distant galaxy, the team measured the disc's size and studied the colours (and hence the temperatures) of different parts of the disc. These observations show a level of precision equivalent to spotting individual grains of sand on the surface of the Moon.

While black holes themselves are invisible, the forces they unleash cause some of the brightest phenomena in the Universe. Quasars — short for quasi-stellar objects — are glowing discs of matter that orbit supermassive black holes, heating up and emitting extremely bright radiation as they do so.

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The accretion discs around supermassive black holes are too distant and too small to observe using conventional methods. However, by combining gravitational macrolensing by an intermediate galaxy, and gravitational microlensing by stars within that galaxy, astronomers are able to probe the structure of these discs. This video explains the method used. The video begins by showing a simulation of the view from Hubble, with the lens galaxy and bright lensed images of the quasar. It then rotates round to a view from the side, showing the relative positions of the objects and the path of the light beams as they are lensed by the galaxy. This is gravitational macrolensing. Note that the distances are shortened. The video then zooms into three different points: The accretion disc at the heart of the quasar, the point at which the quasar’s light passes through the lens galaxy, and the view from Earth’s orbit showing Hubble’s location. The beams of light coming from the accretion disc are bluer when they come from the centre of the disc, and redder when they come from the edges. This is because the centre of the disc, the part closest to the black hole, is much hotter than the edge. As a star passes through the path of the light, beams of light from different parts of the disc get deflected towards the telescope at different times: note how the cross-hairs scanning across the disc of the quasar matches the colour that is deflected towards the telescope at any given time. This is gravitational microlensing. This method can be used to observe the colour profile of the disc with unprecedented precision, comparable to being able to distinguish individual grains of sand on the surface of the Moon. Credit: NASA, ESA, L. Calçada

Until now, the minute apparent size of quasars has meant that most of our knowledge of their inner structure has been based on theoretical extrapolations, rather than direct observations.

The team therefore used an innovative method to study the quasar: using the stars in an intervening galaxy as a scanning microscope to probe features in the quasar's disc that would otherwise be far too small to see. As these stars move across the light from the quasar, gravitational effects amplify the light from different parts of the quasar, giving detailed colour information for a line that crosses through the accretion disc.

The team observed a group of distant quasars that are gravitationally lensed by the chance alignment of other galaxies in the foreground, producing several images of the quasar.

They spotted subtle differences in colour between the images, and changes in colour over the time the observations were carried out. Part of these colour differences are caused by the properties of dust in the intervening galaxies: the light coming from each one of the lensed images has followed a different path through the galaxy, so that the various colours encapsulate information about the material within the galaxy. Measuring the way and extent to which the dust within the galaxies blocks light (known to astronomers as the extinction law) at such distances is itself an important result in the study.

For one of the quasars they studied, though, there were clear signs that stars in the intervening galaxy were passing through the path of the light from the quasar. Just as the gravitational effect due to the whole intervening galaxy can bend and amplify the quasar's light, so can that of the stars within the intervening galaxy subtly bend and amplify the light from different parts of the accretion disc as they pass through the path of the quasar's light.

By recording the variation in colour, the team were able to reconstruct the colour profile across the accretion disc. This is important because the temperature of an accretion disc increases the closer it is to the black hole, and the colours emitted by the hot matter get bluer the hotter they are. This allowed the team to measure the diameter of the disc of hot matter, and plot how hot it is at different distances from the centre.

They found that the disc is between four and eleven light-days across (approximately 100 to 300 billion kilometres). While this measurement shows large uncertainties, it is still a remarkably accurate measurement for a small object at such a great distance, and the method holds great potential for increased accuracy in the future.

"This result is very relevant because it implies we are now able to obtain observational data on the structure of these systems, rather than relying on theory alone," says Muñoz. "Quasars' physical properties are not yet well understood. This new ability to obtain observational measurements is therefore opening a new window to help understand the nature of these objects."

Provided by ESA/Hubble Information Centre