The black hole Packham and his collaborators featured in their study, which was recently published in Science, contains about 10 times the mass of our own sun and is known as V404 Cygni
VISIBLE LIGHT AND X-RAYS helped astronomers paint a detailed picture of the relativistic jet in V404 Cygni
, a black hole-star system.
On observing a 40-mile-wide black hole that is at a distance of 8,000 light years from Earth called the V404 Cygni
, the team were able to make the startling find.
One such system is V404 Cygni
, which is believed to comprise a 17 solar mass black hole with a red giant in a 6.5 day orbit around it.
Narayan's team used the Japanese X-ray satellite ASCA to observe V404 Cygni
, an X-ray nova known to contain a black hole (SN: 2/15/92, p.
The researchers used a binary system called V404 Cygni
to study the bursts of light.
Remillard (MIT) obtained such data for A0620-00; coauthor Charles, Jorge Casares (Oxford University), and Tim Naylor (Keele University) have done it for another transient called V404 Cygni
(S&T: November 1989, page 460).
Two binary stars that recently unleashed an outburst of radiation - Nova Muscae 1991 and V404 Cygni
- would qualify as black hole systems on the basis of their mass (SN: 2/15/92, p.
In a new study published today in Nature Astronomy, an international team of scientists led by Dr Poshak Gandhi show how they used precise multi-wavelength observations of a binary system called V404 Cygni
- consisting of a star and a black hole closely orbiting each other, with the black hole feeding off matter from the star that falls through the disc - to throw light on this hotly debated phenomenon.
(The other candidates are Cygnus X-1, Large Magellanic Cloud (LMC) X-3, LMC X-1, A0620 - 00, and V404 Cygni
Consider the curious case of the two stars known as V404 Cygni
. In 1989, the Japanese research satellite Ginga found that the stellar duo, consisting of a visible star and an unseen companion, sporadically emitted bursts of X-rays so intense that their luminosity exceeded a million times the total brightness of the sun at all wavelengths.
In June 2015, a black hole called V404 Cygni
underwent dramatic brightening for about two weeks, as it devoured material that it had stripped off an orbiting companion star.