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VWN News: Fat Black Holes Grown up in Cities: Observational result using Virtual Observatory
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 Fat Black Holes Grown up in Cities: Observational result using Virtual Observatory

This story is from the category Pure Research
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Date posted: 17/10/2013

A research team, led by reseacher at the National Astronomical Observatory of Japan (NAOJ), discovered that the more massive black holes tend to be located in galactic environments with higher density . This finding indicates that galaxies in a dense area often merge together, causing the growth of massive black holes.

The research team utilized a Virtual Observatory to examine many massive black holes and the environment of active galaxies.

The Virtual Observatory is a system to make integrated use of various astronomical databases around the world via sharing over the Internet. The Astronomy Data Center of NAOJ has been developing an original portal site for the virtual observatory. To begin with this research, the team collected the data on more than 10,000 AGN whose black hole mass had been already measured by spectroscopic observation with SDSS.

Next, data on galaxies surrounding active galaxies were gathered from galaxy catalogues of UKIDSS; the number of galaxies reached approximately 70 million. Using the virtual observatory, the team could automatically and efficiently extract only necessary galactic data from the large amount of data sets on those galaxies surrounding active galaxies. In addition, they developed new analysis method (Note 3) in order to obtain the density distribution of galaxies with a high degree of accuracy.

The research team investigated environment in which a galaxy with a massive black hole at its center exists. The team’s research extended over data for approximately 70 million galaxies, with approximately 10,000 massive black holes researched. This vast amount of data was collected through the Virtual Observatory; it connects a variety of astronomical databases around the world via the Internet, making it possible to comprehensively use the collected data.

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