Sagittarius A*'s Image

Sagittarius A*'s Image


By Ramesh S Krishna
Blog no:27
Date: 13th May, 2022






What is a black hole?
A black hole is a dense area in space where the density of items inside it is infinite. Its gravity is super strong that not even electromagnetic particles like Light cannot escape. The point of no return is called the Event horizon. The black hole doesn't emit light in the visible spectrum. So, never ever have an idea to see the black hole with your eyes. The only way it can be photographed is by Radio or other spectrums.

Sagittarius A* is a black hole in the center of our galaxy. It is believed to be a supermassive black hole.
It has 44Million Solar masses. 

About the image:

This image was taken on the 12th of May, 2022. It was collaborated by Nasa's Chandra X-ray telescope, Nuclear spectroscopic telescope, Neil Gehrels Observatory, &  the Event horizon telescope{EHT}. This image will give more data on the accretion disk.  An accretion disk forms whenever the matter being accreted possesses enough rotational or angular momentum that it cannot simply fall inward toward the accretor along a straight line.

About the black hole:

This black hole was discovered on 13th February 1974 from an observatory in Sydney, Australia. It is 44 Million KM in diameter & weighs 4.3 Million Solar masses. It is located on the edge of Sagittarius & Scorpius with Shaula near it.

Previous images & comparing it to M87. 

 The first image of a black hole ever was taken on April 10, 2019, with EHT. A year before that, ESA published a video on YouTube confirming the existence of Sagittarius A*. Click here to watch the video. As you saw, they confirmed the existence of Sagittarius A* with stars.

Now, let us start comparing!

SGR A*


                                                               M87


As you saw, SGR A* is brighter than M87 due to its distance, Age & Mass. With this, you would have understood why the event horizon is larger. There's also another reason. EHT collaborated on both of these images.

Table for both images
TopicSagittarius A*M87's Blackhole
Distance27000 Light years55 Million light years
Mass44 Million solar masses1000x more massive than SGR A*
AgeN/AN/A
DiscoveredFeb 13, 19741781
Telescope usedEHT, CXO, NST, NGOEHT
Controls MilkywayM87
AgeN/AN/A
ImagedMay 12th, 2022April 11, 2019
Main spectrumRadioRadio

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Have an amazing weekend!




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