24Jun2015

Scientists Measure Black Hole At Galaxy’s Centre Centre

 

The gigantic black hole is in the middle of a banded spiral galaxy called NGC-1097, situated about 45-million light years away in the course of the constellation Fornax.

These black holes are called as supermassive black holes (SMBHs) as they have masses of several millions to tens of billions of solar masses. The observation revealed that there is a connection between the SMBH mass and the central bulge/luminosity of the host galaxy.

“This is the first ever usage of ALMA to make such a dimension for a spiral or barred spiral galaxy,” said co-author Kartik Sheth.

The international team of researchers found that the central supermassive black hole is having a mass 140 million times the mass of the Sun. It is believed that galaxies co-evolved with SMBHs, an important factor in knowing the connection about the evolution of galaxy. The research finding was obtained after a two-hour observation, using ALMA observation data. Kyoko Onishi, a researcher at SOKENDAI (the Graduate University for Advanced Studies) lead the team of researchers in Japan.

Researchers measured the distribution of hydrogen cyanide (HCN) and formylium (HCO+) molecules in the central are of the NGC-1097. Onishi stated that the results indicated the relationship between SMBHs and host galaxy properties varies depending on the type of galaxies, which makes it important to derive accurate supermassive black hole masses in various types of galaxies. Onishi stated:

“While NGC 4526 is a lenticular galaxy, NGC 1097 is a barred spiral galaxy. Recent observation results indicate the relationship between supermassive black hole mass and host galaxy properties varies depending on the type of galaxies, which makes it more important to derive accurate supermassive black hole masses in various types of galaxies.”

Though there are several ways to ascertain the mass of a supermassive black hole, it is depends on the distance of the black hole or the galaxy it inhibits. The new technique could reveal data on the relationship between galaxies and their resident supermassive black holes. Source: Next Digit

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