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Supermassive Black Holes Can’t Swallow Dark Matter

February 04, 2015

A modelled accretion drive about a black hole. Image credit: Michael Owen, John Blondin (North Carolina State Univ.). Source:

Apparently, black holes plus dark matter don’t play effectively together. Broadly talking, black holes is regarded as a substantial part of the “missing mass” inside the universe, however, dark matter is recognized because “non-baryonic matter”. It looks which this mysterious non-baryonic matter has been utilized to explain a big amount of unexplained cosmic mysteries, in the case of supermassive black holes, dark matter plays a surprisingly tiny part insofar to be selected because black hole food…

I was pointed inside the way of a interesting paper complied with a French analysis group entitled “Dark Matter Accretion into Supermassive Black Holes“. In a nutshell they look into dark matter because a potential gas to create supermassive black holes, effectively, supermassive. There has been much debate over to what extent dark matter will need to play inside the development of black holes, thus a complex numerical model was chosen plus compared with observations.

This is the cool bit. It turns out which non-baryonic dark matter (the.k.a. dark matter), because opposed to baryonic matter (the.k.a. protons, neutrons, atoms, “normal” stuff), is very collisionless. This signifies which dark matter, inside its nature, is very non-interacting. It is conveniently spread by stars plus fuel clouds, plus it is actually surprisingly difficult to imagine the stuff create a compact accretion drive about black holes.

Black hole accretion disks generate a great deal of radiation, thus much thus which galactic cores is noticed because quasars. This radiation is yielded because “normal” baryonic matter accrued inside the accretion drive falls to its death inside the black hole event horizon. The matter has been accelerated to relativistic speeds plus regarding 10% of the mass dropping into the ‘hole is converted into power (i.e. E=mc2). A huge number of power is blasted into room because X-ray emissions.

By taking observations of galactic core quasars (the place of supermassive black holes) plus utilizing theoretical models to predict the rate of accretion drive “feeding” into the black hole, a rough estimate about how much dark matter is dropping into the black hole is found. For baryonic matter, the amount of X-rays produced by the quasar is proportional to the amount of matter dropping into the black hole. Dark matter found on the additional hand (theoretically) does not generate X-rays because it falls into a black hole. So, from logical reasoning, when the forecasted rate where mass is dropping into the black hole is a bit more than the noticed stamina emitted, then maybe a few of the mass of the accretion drive is within truth dark matter.

Well, the information are sketchy, however it is very lookin unlikely which dark matter has any big element to play inside the development of supermassive black holes. Less than 10% of the mass of the accretion drive usually comprise of dark matter; the alternative 90% is conveniently accounted for inside the shape of baryonic matter.

Have a consider my Universe Today article for more about black holes plus dark matter…