Double Trouble in Twin Black Holes

NASA Image of the Day


The latest NASA "Image of the Day" image.







Double Trouble in Twin Black Holes

This image from the Chandra X-ray Observatory shows the central region of the starburst galaxy M82 and contains two bright X-ray sources of special interest. New studies with Chandra and ESA's XMM-Newton show that these two sources may be intermediate-mass black holes, with masses in between those of the stellar-mass and supermassive variety. These "survivor" black holes avoided falling into the center of the galaxy and could be examples of the seeds required for the growth of supermassive black holes in galaxies, including the one in the Milky Way. This is the first case where good evidence for more than one mid-sized black hole exists in a single galaxy. The evidence comes from how their X-ray emission varies over time and analysis of their X-ray brightness and spectra, i.e., the distribution of X-rays with energy. These results are interesting because they may help address the mystery of how supermassive black holes in the centers of galaxies form. M82 is located about 12 million light years from Earth and is the nearest place to us where the conditions are similar to those in the early Universe, with lots of stars forming. Multiple observations of M82 have been made with Chandra beginning soon after launch. The Chandra data shown here were not used in the new research because the X-ray sources are so bright that some distortion is introduced into the X-ray spectra. To combat this, the pointing of Chandra is changed so that images of the sources are deliberately blurred, producing fewer counts in each pixel. Image credit: NASA/CXC/Tsinghua Univ./H. Feng et al.





Friday, April 30, 2010 9:30:00 AM

Global Warming

 What is global warming?

Global Warming is defined as the increase of the average temperature on Earth. As the Earth is getting hotter, disasters like hurricanes, droughts and floods are getting more frequent.


To reduce the average earth temperature, just keep it cool by not polluting it.


I request my readers think twice before you go out of your house daily.  Reduce the emission of Carbon Di-Oxide, use public transport instead of cars and bikes for all purposes.  You may end-up wasting your precious time, but end of the day who knows you may conserve a lot of energy for future generations and in turn reduce pollution.  Anyway, where there is a will-there is a way.......so try-me....?

Invitation

Hi,
Everyone;

This is critic writer. I welcome one and all to view my blog page. Enjoy my posts......coming soon?

Bye..........?